Autonomics Flashcards

Question

5. What effect would an adrenergic antagonist have on blood pressure? a) Increase b) Decrease c) No change d) Variable

Answer 1

b) Decrease Rationale: Adrenergic antagonists inhibit sympathetic activity, leading to effects like decreased blood pressure.

Answer 2

a) Cholinergic Agonist Rationale: Cholinergic agonists stimulate parasympathetic activities, leading to increased glandular secretions.

Answer 3

c) Inhibit sympathetic activity Rationale: Adrenergic antagonists block the action of norepinephrine and adrenaline, reducing sympathetic activity.

Answer 4

c) Adrenergic Agonist Rationale: Adrenergic agonists enhance or mimic the effects of norepinephrine and adrenaline.

Answer 5

c) Adrenergic Agonist Rationale: Adrenergic agonists are often used in heart conditions to enhance sympathetic responses.

Answer 6

b) Decrease Rationale: Cholinergic antagonists induce sympathetic-like effects, including decreased digestive activity.

Answer 7

c) Adrenergic Agonist Rationale: Adrenergic agonists stimulate or enhance the effects of adrenaline.

Answer 8

a) Increase Rationale: By blocking the action of acetylcholine, cholinergic antagonists induce an increase in heart rate.

Answer 9

c) Mimic the actions of acetylcholine Rationale: Cholinergic agonists stimulate the parasympathetic nervous system by mimicking the actions of acetylcholine.

Answer 10

b) Direct Acting Cholinergic Agonists Rationale: Direct acting cholinergic agonists bind directly to and activate acetylcholine receptors.

Answer 11

a) Direct Acting Rationale: Pilocarpine is a direct-acting cholinergic agonist, used for glaucoma treatment.

Answer 12

c) Neostigmine

Answer 13

b) Pesticides Rationale: Organophosphates, which are a type of indirect acting cholinergic agonist, are typically used as pesticides.

Answer 14

b) Inhibiting the breakdown of acetylcholine Rationale: Indirect acting cholinergic agonists increase acetylcholine levels by inhibiting its breakdown.

Answer 15

b) Bethanechol Rationale: Bethanechol is a direct acting cholinergic agonist.

Answer 16

b) Myasthenia Gravis Rationale: Neostigmine is an indirect acting cholinergic agonist used primarily in the management of myasthenia gravis.

Answer 17

b) Direct Acting Cholinergic Agonists Rationale: Drugs ending in "-chol" are typically direct acting cholinergic agonists, reflecting their relation to acetylcholine.

Answer 18

c) Ecothiophate Rationale: Ecothiophate/ Isoflurophate is an organophosphate and an indirect acting cholinergic agonist.

Answer 19

a) Direct Acting

Answer 20

a) It has a short half-life Rationale: Acetylcholine has a very short half-life, making it impractical to use in drug form. Analogues and derivatives are used instead.

Answer 21

b) Pilocarpine Rationale: Pilocarpine is primarily used for treating glaucoma due to its ability to stimulate miosis and facilitate the opening of the trabecular meshwork.

Answer 22

b) Decreases heart rate and contractility Rationale: Acetylcholine affects the CVS by decreasing heart rate and contractility, and lowering blood pressure.

Answer 23

b) Urinary retention Rationale: Bethanechol is used to treat urinary retention by activating smooth muscle in the bladder and bowel, facilitating voiding and bowel movements.

Answer 24

a) Decreases intraocular pressure Rationale: Carbachol activates the ciliary muscle of the eye, which helps in the management of open-angle glaucoma, and the pupillary sphincter, used for narrow-angle glaucoma.

Answer 25

b) Hallucinations and convulsions Rationale: Pilocarpine can penetrate the CNS and may cause hallucinations and convulsions; overdose can lead to severe hallucinations.

Answer 26

b) Asthma and bronchial hyperactivity Rationale: The methacholine challenge test, which provokes bronchoconstriction, is used to diagnose asthma and bronchial hyperactivity.

Answer 27

b) Increase motility Rationale: Acetylcholine increases motility in the GI system.

Answer 28

b) Pilocarpine Rationale: Pilocarpine stimulates miosis, which is utilized in the treatment of glaucoma.

Answer 29

b) Bethanechol, Bladder, Bowel Rationale: The mnemonic "BBB" for Bethanechol helps remember its use in treating conditions related to the bladder and bowel.

Answer 30

b) Stimulating the release of epinephrine leading to sweating Rationale: Acetylcholine stimulates the release of epinephrine, leading to sweating. This response is not purely sympathetic.

Answer 31

c) Decreasing intraocular pressure Rationale: Carbachol is used in glaucoma treatment primarily for its action in decreasing intraocular pressure.

Answer 32

b) Increase secretion in the bronchioles Rationale: Acetylcholine increases secretion in the bronchioles as part of its effect on the pulmonary system.

Answer 33

b) Induce muscle contraction Rationale: In the PNS, acetylcholine induces muscle contraction.

Answer 34

b) Induce miosis Rationale: Carbachol is used in eye surgery for its ability to induce miosis.

Answer 35

a) Neurotransmission Rationale: Acetylcholine is involved in neurotransmission within the CNS.

Answer 36

b) Provoke bronchoconstriction Rationale: Methacholine is used to diagnose asthma and bronchial hyperactivity due to its ability to provoke bronchoconstriction.

Answer 37

b) Stimulating miosis and facilitating the opening of the trabecular meshwork Rationale: Pilocarpine treats glaucoma by stimulating miosis and facilitating the opening of the trabecular meshwork at the Canal of Schlemm.

Answer 38

a) Activate smooth muscle Rationale: Bethanechol activates smooth muscle in the bladder and bowel, aiding in voiding and bowel movements.

Answer 39

b) Specific actions and side effects Rationale: Carbachol's limited use is attributed to its specific actions and side effects, making it less suitable for general use compared to other medications.

Answer 40

c) They irreversibly inhibit acetylcholinesterase. Rationale: Organophosphates bind covalently to acetylcholinesterase, irreversibly inhibiting it and thus increasing acetylcholine levels.

Answer 41

b) Pralidoxime Rationale: Pralidoxime is used as an antidote to organophosphate poisoning.

Answer 42

b) About a week Rationale: The inhibition of acetylcholinesterase by organophosphates typically lasts for about a week.

Answer 43

b) Washing the patient to remove any organophosphate from the skin Rationale: The initial steps in real-world treatment of organophosphate poisoning include washing the patient to remove the chemical from the skin.

Answer 44

a) Isofluorophate Rationale: Isofluorophate is an example of an organophosphate used occasionally in the treatment of glaucoma.

Answer 45

b) Diarrhea, Urination, Miosis Rationale: DUMBELS in organophosphate poisoning stands for Diarrhea, Urination, Miosis, Bronchoconstriction, Excitation of skeletal muscles, Lacrimation, Salivation and sweating.

Answer 46

b) Decrease Rationale: Organophosphate poisoning can lead to decreased blood pressure as part of the DUMBELS symptomatology.

Answer 47

b) It is used to counteract falling blood pressure and heart rate. Rationale: Atropine may be administered in organophosphate poisoning based on symptoms such as falling blood pressure and heart rate.

Answer 48

c) Sweating (Not Purely SNS) Rationale: While most effects of organophosphate poisoning are parasympathetic, sweating is a sympathetic response.

Answer 49

b) The use of pralidoxime as an antidote Rationale: For exam purposes, it is important to remember that pralidoxime is the antidote for organophosphate poisoning.

Answer 50

b) Bronchoconstriction Rationale: Bronchoconstriction is a symptom of organophosphate poisoning affecting the pulmonary system.

Answer 51

b) Glaucoma Rationale: Echothiophate is an organophosphate occasionally used in the treatment of glaucoma.

Answer 52

b) Increase Rationale: Organophosphate poisoning leads to increased salivation as part of the DUMBELS symptomatology.

Answer 53

b) Gastric lavage and activated charcoal Rationale: Gastric lavage and administration of activated charcoal are further steps in the treatment of organophosphate poisoning.

Answer 54

c) Causes miosis (pupil constriction) Rationale: Organophosphates cause miosis, or pupil constriction, as part of their effect on the body.

Answer 55

b) Remove the toxin from the stomach Rationale: Gastric lavage is performed to remove the organophosphate toxin from the stomach.

Answer 56

b) Absorb the toxin from the gastrointestinal tract Rationale: Activated charcoal is used in organophosphate poisoning to absorb the toxin from the gastrointestinal tract.

Answer 57

b) Muscle spasms and twitching Rationale: Excitation of skeletal muscles in organophosphate poisoning can lead to muscle spasms and twitching.

Answer 58

b) Remove any organophosphate from the skin Rationale: Washing the patient in organophosphate poisoning is crucial to remove the chemical from the skin and prevent its transfer to healthcare providers.

Answer 59

b) Increased parasympathetic activity Rationale: Lacrimation or increased tearing in organophosphate poisoning is a result of increased parasympathetic activity.

Answer 60

b) Reversibly inhibiting acetylcholinesterase Rationale: These drugs increase acetylcholine levels by reversibly inhibiting acetylcholinesterase, leading to an accumulation of acetylcholine.

Answer 61

b) Myasthenia Gravis Rationale: Neostigmine is the drug of choice for the treatment of myasthenia gravis.

Answer 62

c) 3-6 hours Rationale: Pyridostigmine has a long-lasting effect, typically 3-6 hours, and is used for long-term maintenance treatment of myasthenia gravis.

Answer 63

b) Diagnose myasthenia gravis Rationale: Edrophonium is administered to diagnose myasthenia gravis due to its brief increase in endogenous acetylcholine.

Answer 64

c) Atropine, phenothiazines, and TCAs Rationale: Physostigmine can cross the blood-brain barrier and is effective for overdoses of atropine, phenothiazines, and tricyclic antidepressants (TCAs).

Answer 65

b) As a second-choice drug for glaucoma Rationale: Physostigmine is used as a second-choice drug for glaucoma due to its ability to increase acetylcholine levels.

Answer 66

c) Edrophonium Shortest T1/2 (Duration of action) Rationale: Edrophonium causes a brief increase in endogenous acetylcholine and is used diagnostically for myasthenia gravis.

Answer 67

b) Neostigmine used for myasthenia gravis Rationale: "Neo the Cure" is a mnemonic indicating that Neostigmine is the drug of choice for myasthenia gravis treatment.

Answer 68

b) Long-term maintenance treatment of myasthenia gravis Rationale: Pyridostigmine is primarily used for the long-term maintenance treatment of myasthenia gravis.

Answer 69

d) Physostigmine Rationale: Physostigmine is not recommended for myasthenia gravis treatment.

Answer 70

b) Worsen a cholinergic crisis Rationale: Edrophonium can worsen a cholinergic crisis if misused, particularly in the context of myasthenia gravis.

Answer 71

a) Causing cataracts and muscle paralysis Rationale: Physostigmine can cause side effects such as cataracts and muscle paralysis.

Answer 72

c) Neuromuscular junction (NMJ) blockade post-operation Rationale: Neostigmine is used for the reversal of neuromuscular junction blockade post-operation.

Answer 73

b) Increase endogenous acetylcholine, enhancing muscle strength Rationale: Pyridostigmine increases endogenous acetylcholine, which enhances muscle strength, particularly in the treatment of myasthenia gravis.

Answer 74

c) Seizures Rationale: Due to its ability to cross the BBB, Physostigmine can lead to seizures as a side effect.

Answer 75

b) Pyridostigmine Rationale: The mnemonic "Dodong the Long Name" refers to Pyridostigmine, which is used for long-term maintenance therapy in myasthenia gravis.

Answer 76

c) Diagnostic use Rationale: Edrophonium is used primarily for the diagnostic evaluation of myasthenia gravis.

Answer 77

c) Treating neurogenic ileus and urinary retention Rationale: Neostigmine is used in postoperative care for the treatment of neurogenic ileus and urinary retention.

Answer 78

c) Can lead to seizures due to CNS penetration Rationale: Due to its ability to cross the blood-brain barrier, Physostigmine can lead to seizures.

Answer 79

b) To increase heart rate in bradycardia Rationale: Atropine is administered in cases of bradycardia to increase heart rate.

Answer 80

c) Dilating pupils for eye examinations Rationale: Atropine is used in ophthalmology, particularly in fundoscopy, to dilate pupils.

Answer 81

c) Organophosphate Rationale: Atropine is used as an antidote for organophosphate poisoning.

Answer 82

c) Atropa belladonna Rationale: Atropine is derived from the plant Atropa belladonna.

Answer 83

b) Blocking muscarinic receptors Rationale: Atropine works by blocking the effects of acetylcholine on muscarinic receptors.

Answer 84

c) About 4 hours Rationale: Atropine lasts about 4 hours in the body, but its effect can persist for up to 72 hours in the eyes.

Answer 85

c) Narrow-angle glaucoma Rationale: Atropine is not recommended for individuals with narrow-angle glaucoma due to the risk of acute crisis.

Answer 86

b) Dry mouth Rationale: "Dry as a Bone" refers to the symptom of dry mouth in atropine toxicity.

Answer 87

b) Tachycardia Rationale: In overdose, atropine CANNOT cross the blood-brain barrier BUT can cause tachycardia.

Answer 88

b) Reduces secretions Rationale: Atropine is used in gastrointestinal procedures to reduce secretions.

Answer 89

b) Hallucinations or delirium Rationale: "Mad as a Hatter" describes the potential for hallucinations or delirium in atropine toxicity.

Answer 90

c) Reducing urinary urgency Rationale: Atropine reduces urinary urgency by alleviating bladder spasms.

Answer 91

a) Benztropine Rationale: Benztropine is a muscarinic antagonist used in the treatment of Parkinson's disease.

Answer 92

b) Thorazine (Chlorpromazine) Rationale: Thorazine (Chlorpromazine) is an antipsychotic medication that also acts as a muscarinic antagonist.

Answer 93

b) Allergies Rationale: Diphenhydramine is an antihistamine commonly used for allergies.

Answer 94

c) As a bronchodilator in asthma Rationale: Ipratropium is used as a bronchodilator in the treatment of asthma.

Answer 95

b) Tachycardia and cutaneous vasodilation Rationale: "Red as a Beet" describes tachycardia and cutaneous vasodilation seen in atropine toxicity.

Answer 96

b) Blurred vision Rationale: "Blind as a Bat" in atropine toxicity refers to the side effect of blurred vision.

Answer 97

b) Absence of sweating Rationale: "Hot as a Hare" signifies the absence of sweating in atropine toxicity.

Answer 98

b) Decrease Rationale: Atropine decreases salivation as part of its muscarinic antagonist action.

Answer 99

c) It is the only depolarizing NMJ blocker currently in use Rationale: Succinylcholine is unique because it is the only depolarizing neuromuscular junction blocker being used clinically.

Answer 100

c) Inducing paralysis during surgery Rationale: Succinylcholine is commonly used to induce paralysis during surgery or facilitate mechanical ventilation.

Answer 101

b) 3-6 minutes Rationale: The effects of succinylcholine usually last between 3 to 6 minutes, making it suitable for short procedures.

Answer 102

b) Malignant Hyperthermia Rationale: Malignant Hyperthermia is the most common and severe adverse reaction to succinylcholine.

Answer 103

b) Dantrolene Rationale: Dantrolene is the antidote used to treat Malignant Hyperthermia, a severe reaction to succinylcholine.

Answer 104

b) Prolonged depolarization Rationale: In Phase I block, succinylcholine causes prolonged depolarization of the muscle cell, opening sodium channels.

Answer 105

b) They potentiate the block Rationale: During Phase I block of succinylcholine, cholinesterase inhibitors actually potentiate the effect, rather than reversing it.

Answer 106

b) The muscle cell repolarizes but remains blocked Rationale: In Phase II block, the muscle cell repolarizes but becomes desensitized to acetylcholine, preventing further action potential generation.

Answer 107

c) Neostigmine Rationale: Neostigmine, a cholinesterase inhibitor, can be used to reverse the Phase II block caused by succinylcholine.

Answer 108

a) Treating hypertension Rationale: Succinylcholine is not used for treating hypertension; it is used to induce paralysis during surgery and facilitate mechanical ventilation.

Answer 109

d) Muscles are unable to contract Rationale: Succinylcholine causes paralysis by preventing muscle contraction through prolonged depolarization and subsequent desensitization.

Answer 110

b) It mimics acetylcholine at the NMJ Rationale: Succinylcholine mimics acetylcholine at the neuromuscular junction, leading to depolarization and paralysis.

Answer 111

c) Induce muscle relaxation Rationale: Succinylcholine is used alongside general anesthesia to induce muscle relaxation and facilitate surgical procedures.

Answer 112

b) Phase II Rationale: Cholinesterase inhibitors like neostigmine can reverse the Phase II block of succinylcholine but not the Phase I block.

Answer 113

b) Short surgical procedures Rationale: The short duration of action (3-6 minutes) makes succinylcholine suitable for short surgical procedures and rapid sequence intubation.

Answer 114

b) Nondepolarizing neuromuscular blockers Rationale: Tubocurarine and Atracurium are prominent nondepolarizing neuromuscular blockers used as muscle relaxants during surgery.

Answer 115

b) Relax muscles during surgical procedures Rationale: Nondepolarizing neuromuscular blockers are used to relax muscles in preparation for or during surgical procedures.

Answer 116

c) Muscles of the eyes and face Rationale: The initial effect of nondepolarizing neuromuscular blockers is usually observed in the muscles of the eyes and face.

Answer 117

c) Neostigmine Rationale: Neostigmine, a cholinesterase inhibitor, is commonly used to reverse the blockade caused by nondepolarizing neuromuscular blockers.

Answer 118

b) Malignant hyperthermia Rationale: Dantrolene is used to treat malignant hyperthermia, particularly associated with the use of succinylcholine and halothane.

Answer 119

b) Preventing the release of calcium from the sarcoplasmic reticulum Rationale: Dantrolene works by inhibiting the release of calcium from the sarcoplasmic reticulum of skeletal muscle cells, reducing muscle contraction.

Answer 120

a) Neuroleptic malignant syndrome Rationale: Dantrolene is effective in treating neuroleptic malignant syndrome, a severe reaction to antipsychotic drugs.

Answer 121

b) Nondepolarizing neuromuscular blockers Rationale: Edrophonium, a cholinesterase inhibitor, can be used to reverse the effects of nondepolarizing neuromuscular blockers.

Answer 122

c) Respiratory system Rationale: The last effect of nondepolarizing neuromuscular blockers is generally observed on the respiratory system.

Answer 123

c) Cholinesterase inhibitors Rationale: Cholinesterase inhibitors like neostigmine and edrophonium are used to reverse the blockade caused by nondepolarizing neuromuscular blockers.

Answer 124

b) Block acetylcholine at the NMJ Rationale: Nondepolarizing neuromuscular blockers function by blocking the action of acetylcholine at the neuromuscular junction, preventing muscle contraction.

Answer 125

c) The mechanism of muscle relaxation Rationale: The key difference lies in their mechanism of action; depolarizing blockers like succinylcholine mimic acetylcholine, while nondepolarizing blockers like tubocurarine block acetylcholine.

Answer 126

c) Facilitate intubation and surgical access Rationale: These blockers are primarily used to relax muscles, thereby facilitating intubation and providing better surgical access.

Answer 127

c) The essential role of muscles in respiration Rationale: The respiratory system is particularly affected due to the essential role of muscles in breathing, making their relaxation critical.

Answer 128

b) Nicotinic neuronal receptors Rationale: Ganglionic blockers function by inhibiting nicotinic neuronal receptors present in both the sympathetic and parasympathetic ganglia of the autonomic nervous system.

Answer 129

c) Hypertensive emergencies Rationale: One of the few remaining uses of ganglionic blockers is in the rapid decrease of blood pressure during hypertensive emergencies.

Answer 130

b) Tachycardia Rationale: Tachycardia occurs due to the inhibition of parasympathetic influence on the heart by ganglionic blockers.

Answer 131

b) Blockade of sympathetic vasoconstrictive signals Rationale: Ganglionic blockers cause vasodilation by inhibiting sympathetic vasoconstrictive signals.

Answer 132

b) Reduced parasympathetic activity in the eye Rationale: Mydriasis occurs as a result of decreased parasympathetic activity in the eye due to ganglionic blockers.

Answer 133

c) Reduction in motility Rationale: Reduced GIT motility is a side effect of ganglionic blockers as both sympathetic and parasympathetic influences are diminished.

Answer 134

b) Relaxation of the bladder muscle Rationale: Ganglionic blockers can lead to urinary retention as a result of the relaxation of the bladder muscle.

Answer 135

b) Diminished sympathetic stimulation of sweat glands Rationale: Decreased sweating is due to reduced sympathetic stimulation of sweat glands when using ganglionic blockers.

Answer 136

c) Their broad and often unpredictable effects Rationale: Ganglionic blockers are seldom used because of their wide-ranging and often unpredictable effects on the body.

Answer 137

b) Changes in blood pressure Rationale: Due to their significant impact on blood pressure, monitoring for changes in blood pressure is crucial when using ganglionic blockers.

Answer 138

c) α1, α2, β1, and β2 Rationale: Epinephrine acts on α1, α2, β1, and β2 adrenergic receptors, causing a range of effects like increased heart rate, vasoconstriction, and bronchodilation.

Answer 139

b) Causing vasoconstriction Rationale: Norepinephrine primarily affects α1 receptors, causing vasoconstriction and thereby increasing blood pressure.

Answer 140

b) β1 and β2 receptors Rationale: Isoproterenol has an equal affinity for β1 and β2 receptors, leading to increased heart rate and bronchodilation.

Answer 141

b) Vasodilation Rationale: At low doses, dopamine predominantly affects dopamine receptors, leading to vasodilation.

Answer 142

c) Increasing heart rate and force of contraction Rationale: Dobutamine primarily stimulates β1 receptors, increasing cardiac output by raising heart rate and the force of contraction.

Answer 143

c) Isoproterenol Rationale: Isoproterenol lacks significant vasoconstrictive or vasodilative effects as it does not act on α receptors.

Answer 144

c) β1 receptors Rationale: Epinephrine increases heart rate and cardiac output primarily through its action on β1 adrenergic receptors.

Answer 145

b) Epinephrine Rationale: Epinephrine is commonly used in cardiac arrest due to its ability to increase heart rate and cardiac output.

Answer 146

a) β and α receptors Rationale: At higher doses, dopamine stimulates β and α receptors, increasing heart rate and blood pressure.

Answer 147

c) Minimal Rationale: Dobutamine primarily stimulates β1 receptors and has minimal effects on vascular resistance.

Answer 148

c) Isoproterenol Rationale: Isoproterenol causes bronchodilation due to its action on β2 receptors.

Answer 149

d) Norepinephrine Rationale: Norepinephrine is often preferred for treating shock due to its potent vasoconstrictive effects, which help to increase blood pressure.

Answer 150

a) β2 receptors causing bronchodilation Rationale: In anaphylaxis, epinephrine's action on β2 receptors causing bronchodilation is crucial for opening airways.

Answer 151

c) Isoproterenol Rationale: Isoproterenol, due to its strong action on β1 receptors, is more likely to cause tachycardia as a side effect.

Answer 152

a) Hypertension Rationale: Clonidine, an α2 agonist, is primarily used to treat hypertension.

Answer 153

b) Increase cardiac contractility Rationale: In heart failure, dobutamine is used to increase cardiac contractility and improve cardiac output.

Answer 154

a) α1 Rationale: Phenylephrine is an α1 agonist that causes vasoconstriction, leading to increased blood pressure.

Answer 155

b) Nasal decongestant Rationale: Phenylephrine is often used as a nasal decongestant.

Answer 156

b) Orthostatic hypotension Rationale: Patients on clonidine should be cautious of orthostatic hypotension and change positions slowly.

Answer 157

b) Hypotension Rationale: Methoxamine, an α1 agonist, is primarily used to treat hypotension.

Answer 158

b) Sedation Rationale: Common adverse drug reactions of clonidine include sedation, dry mouth, sexual dysfunction, and orthostatic hypotension.

Answer 159

d) Myocardial infarction Rationale: Clonidine has been studied for various off-label uses, but myocardial infarction is not one of them.

Answer 160

b) Increases it Rationale: Phenylephrine causes vasoconstriction, leading to an increase in blood pressure.

Answer 161

b) Restless leg syndrome Rationale: Clonidine has off-label use in managing conditions like restless leg syndrome and Tourette's Syndrome.

Answer 162

b) Increased blood pressure Rationale: Excessive use of phenylephrine in over-the-counter cold and allergy medications during the COVID season led to significant increases in blood pressure in some cases.

Answer 163

a) Vasodilation Rationale: Clonidine, an α2 agonist, reduces blood pressure primarily through vasodilation.

Answer 164

b) Reflex bradycardia Rationale: Methoxamine can cause reflex bradycardia as a result of its vasoconstrictive action on α1 receptors.

Answer 165

b) Reduce anxiety Rationale: Clonidine is effective in managing benzodiazepine and opiate withdrawal, likely due to its sedative and anxiolytic effects.

Answer 166

b) Dry mouth Rationale: Dry mouth is a common side effect of clonidine, along with sedation and sexual dysfunction.

Answer 167

c) Baroreceptor reflex Rationale: Reflex bradycardia from phenylephrine is caused by the baroreceptor reflex in response to increased blood pressure.

Answer 168

c) Phenylephrine Rationale: Phenylephrine is commonly used as a nasal decongestant due to its vasoconstrictive properties.

Answer 169

b) Sedative effect Rationale: Clonidine is used off-label for ADHD, likely due to its sedative effects, which can help with hyperactivity and impulsivity.

Answer 170

a) Reduce heart rate

Answer 171

c) Hypotension Rationale: Methoxamine is primarily used to treat hypotension due to its vasoconstrictive action on α1 receptors.

Answer 172

a) β1 receptors Rationale: Dobutamine has a greater effect on β1 receptors, making it useful in increasing cardiac output, especially in congestive heart failure (CHF).

Answer 173

c) Congestive heart failure (CHF) Rationale: Dobutamine is used primarily in the management of unstable congestive heart failure and shock situations due to its action on β1 receptors.

Answer 174

b) β1 and β2 receptors Rationale: Isoproterenol has an equal affinity for both β1 and β2 receptors, affecting both cardiovascular and respiratory systems.

Answer 175

b) Increased heart rate Rationale: Dobutamine increases heart rate and cardiac output, which is beneficial in treating conditions like congestive heart failure.

Answer 176

a) Heart block and bradycardia Rationale: Isoproterenol is used in patients with heart block and bradycardia to stimulate heart rate.

Answer 177

c) Bronchodilation Rationale: Isoproterenol causes bronchodilation due to its action on β2 receptors, making it beneficial in certain respiratory conditions.

Answer 178

c) Increased cardiac output Rationale: Dobutamine increases cardiac output by its action on β1 receptors, without significantly raising the heart rate.

Answer 179

b) Decrease it Rationale: Isoproterenol lowers peripheral vascular resistance, which can reduce blood pressure.

Answer 180

b) Tachycardia Rationale: As dobutamine stimulates β1 receptors in the heart, a common side effect is tachycardia.

Answer 181

c) β2 receptors Rationale: Isoproterenol's action on β2 receptors in the lungs leads to bronchodilation, which is useful in treating certain respiratory conditions.

Answer 182

c) Dobutamine has a greater effect on β1 receptors Rationale: Dobutamine primarily acts on β1 receptors, whereas isoproterenol equally affects β1 and β2 receptors.

Answer 183

b) Peripheral vascular resistance Rationale: Isoproterenol lowers peripheral vascular resistance, which can lead to a reduction in blood pressure.

Answer 184

a) Shock situations Rationale: Dobutamine is effective in shock situations due to its ability to increase cardiac output.

Answer 185

b) Isoproterenol Rationale: Isoproterenol is beneficial in this scenario due to its bronchodilatory effect (β2 action) and ability to increase heart rate (β1 action).

Answer 186

c) Capacity to increase cardiac output Rationale: In unstable CHF, dobutamine is chosen for its ability to effectively increase cardiac output without significantly raising heart rate.

Answer 187

b) Dilate bronchial smooth muscles Rationale: Beta2 selective agonists primarily act on beta2-adrenergic receptors in the bronchial smooth muscles, causing bronchodilation and easing breathing in conditions like asthma and COPD.

Answer 188

b) Relax the uterus during premature labor Rationale: Apart from their pulmonary applications, Terbutaline and Ritodrine can be used to relax the uterus, delaying delivery and reducing complications in premature birth.

Answer 189

a) Tachyphylaxis Rationale: Tachyphylaxis, a rapidly diminishing response to successive doses of a drug, is a known adverse reaction of Beta2 selective agonists.

Answer 190

b) Asthma and COPD Rationale: Metaproterenol is commonly used in the treatment of bronchial asthma and Chronic Obstructive Pulmonary Disease (COPD).

Answer 191

b) Stimulating beta2 receptors Rationale: Albuterol works by stimulating beta2 receptors in bronchial smooth muscles, leading to bronchodilation.

Answer 192

a) Asthma Rationale: Beta2 selective agonists like Terbutaline are most commonly prescribed for asthma due to their bronchodilatory effect.

Answer 193

c) Relax the uterus Rationale: Ritodrine is used in premature labor to relax the uterus, helping to delay delivery and reduce premature birth complications.

Answer 194

b) Albuterol Rationale: Albuterol is frequently used for quick relief during asthma attacks due to its fast-acting bronchodilatory effect.

Answer 195

b) Bronchodilation Rationale: The therapeutic effect in COPD treatment with Beta2 selective agonists arises from bronchodilation, which improves airflow and breathing

Answer 196

b) Delaying premature labor Rationale: Besides its pulmonary applications, Terbutaline is also used to delay premature labor by relaxing the uterus.

Answer 197

c) Terbutaline Rationale: Terbutaline, apart from its use in respiratory conditions, is also utilized to manage premature labor.

Answer 198

b) Diminished response with successive doses Rationale: Tachyphylaxis is characterized by a rapidly diminishing response to successive doses of a drug like Albuterol, making it less effective over time.

Answer 199

b) Relieve bronchoconstriction Rationale: Metaproterenol is chosen for asthma treatment due to its bronchodilatory effect, which relieves bronchoconstriction and eases breathing.

Answer 200

b) Quick onset of action Rationale: Albuterol's quick onset of action makes it a preferred choice for immediate relief in acute asthma episodes.

Answer 201

c) Relax bronchial smooth muscles Rationale: Terbutaline aids in COPD management by relaxing bronchial smooth muscles, thereby improving airflow and reducing breathing difficulties.

Answer 202

b) Alpha receptors Rationale: At low doses, epinephrine predominantly acts on alpha receptors. Its action shifts towards beta receptors at higher doses.

Answer 203

b) Bronchial asthma Rationale: Epinephrine is used in the treatment of bronchial asthma, anaphylaxis, and achieving hemostasis.`

Answer 204

b) Alpha-adrenergic receptors Rationale: When epinephrine is administered following the blockade of alpha-adrenergic receptors, beta-receptor activation becomes more apparent, leading to a fall in blood pressure.

Answer 205

d) Beta2 Rationale: Norepinephrine does not act on beta2 receptors, differentiating it from other catecholamines.

Answer 206

b) Inducing reflex bradycardia Rationale: Norepinephrine primarily causes vasoconstriction and can induce reflex bradycardia.

Answer 207

b) Activation of dopamine receptors Rationale: At lower doses, dopamine predominantly acts on dopamine receptors, leading to vasodilation.

Answer 208

b) Shock Rationale: Dopamine is used in the management of shock, acute respiratory failure, and congestive heart failure.

Answer 209

b) As a last resort in resuscitation efforts Rationale: Norepinephrine is often used in resuscitation efforts, especially as a last resort to stimulate the heart.

Answer 210

b) Beta receptors Rationale: At higher doses, epinephrine's action predominantly affects beta receptors, leading to effects like bronchodilation and increased heart rate.

Answer 211

c) Increased heart rate and cardiac output Rationale: At higher doses, dopamine stimulates beta receptors, leading to increased heart rate and cardiac output.

Answer 212

c) Cause bronchodilation Rationale: Epinephrine is crucial in treating anaphylaxis due to its bronchodilatory effect, along with its ability to increase heart rate and vasoconstriction.

Answer 213

a) Cannot induce bronchodilation Rationale: Norepinephrine's absence of action on beta2 receptors means it does not induce bronchodilation, unlike some other catecholamines.

Answer 214

b) Shock Rationale: Dopamine's vasodilation effect at lower doses is particularly useful in the treatment of shock, where maintaining blood flow is crucial.

Answer 215

b) Further increase blood pressure Rationale: Due to its vasoconstrictive effect, epinephrine can further increase blood pressure in patients with pre-existing hypertension.

Answer 216

d) Increase cardiac output Rationale: Dopamine is preferred in shock situations due to its ability to increase cardiac output and improve blood flow to vital organs.

Answer 217

b) Hypertensive crisis Rationale: Tyramine can trigger a hypertensive crisis when ingested with monoamine oxidase inhibitors (MAOIs), due to excessive release of norepinephrine.

Answer 218

b) Attention-Deficit/Hyperactivity Disorder (ADHD) Rationale: Amphetamine is primarily prescribed for ADHD and appetite suppression, due to its ability to stimulate the release of norepinephrine and dopamine in the CNS.

Answer 219

b) Causing the release of neurotransmitters Rationale: Amphetamines work indirectly by stimulating the release of neurotransmitters like norepinephrine and dopamine, rather than directly activating receptors.

Answer 220

c) Monoamine oxidase inhibitors (MAOIs) Rationale: Tyramine-rich foods like red wine, beer, and cheese can cause a hypertensive crisis when ingested with MAOIs.

Answer 221

c) Central nervous system (CNS) Rationale: Amphetamine can enter the CNS and stimulate the release of neurotransmitters, affecting mood, attention, and alertness.

Answer 222

b) Risk of a hypertensive crisis Rationale: The interaction between tyramine and MAOIs is dangerous due to the increased risk of a hypertensive crisis.

Answer 223

a) Appetite suppression Rationale: Amphetamine is also used for appetite suppression due to its stimulant effects on the CNS.

Answer 224

c) It can cause serious interactions with certain medications Rationale: Tyramine is not used as a drug in medical treatments due to its potential to cause dangerous interactions, especially with MAOIs.

Answer 225

c) Elevated blood pressure Rationale: Tyramine ingestion in individuals taking MAOIs can lead to elevated blood pressure, potentially resulting in a hypertensive crisis.

Answer 226

c) Increased alertness and energy Rationale: Amphetamine increases alertness and energy by stimulating the release of norepinephrine and dopamine in the CNS.

Answer 227

b) Releasing norepinephrine from nerve terminals Rationale: Ephedrine primarily works by releasing norepin

Answer 228

a) Urinary incontinence Rationale: Ephedrine is used in treating urinary incontinence due to its ability to increase urethral sphincter tone.

Answer 229

b) Bronchodilatory effects Rationale: Ephedrine has bronchodilatory effects, which make it effective in relieving bronchospasm.

Answer 230

b) Managing hypotension Rationale: Metaraminol is primarily used to manage hypotension, including in shock or during spinal anesthesia.

Answer 231

b) Releasing norepinephrine from nerve terminals Rationale: Metaraminol, similar to ephedrine, works by releasing norepinephrine from nerve terminals, which affects blood pressure and other bodily functions.

Answer 232

c) Vasoconstrictive action Rationale: Ephedrine's ability to release norepinephrine leads to vasoconstriction, making it useful in treating hypotension.

Answer 233

c) Hypotension Rationale: Metaraminol is used during spinal anesthesia to counteract hypotension, a common side effect of this type of anesthesia.

Answer 234

b) Relieve bronchial muscle constriction Rationale: Ephedrine relieves bronchospasm by causing bronchodilation, easing breathing difficulties in conditions like asthma.

Answer 235

b) Increasing urethral sphincter tone Rationale: Ephedrine increases urethral sphincter tone, thereby reducing incontinence.

Answer 236

b) Release norepinephrine from nerve terminals Rationale: Both ephedrine and metaraminol act by releasing norepinephrine from nerve terminals, affecting cardiovascular and respiratory systems.

Answer 237

b) Controlling hypertension in pheochromocytoma Rationale: Phenoxybenzamine is mainly used for pheochromocytoma, benign prostatic hyperplasia, and hypertension secondary to spinal cord injuries.

Answer 238

b) Irreversible Rationale: Phenoxybenzamine is an irreversible alpha blocker, leading to longer-lasting effects and requiring careful usage.

Answer 239

a) Orthostatic hypotension Rationale: Common side effects of alpha1 selective blockers like Prazosin, Terazosin, and Doxazosin include the first-dose phenomenon of orthostatic hypotension.

Answer 240

c) Impotence Rationale: Yohimbine has been controversially used for impotence, sometimes via direct penile injection, although its efficacy and safety are debated.

Answer 241

a) Reversible alpha blocker Rationale: Phentolamine is a reversible alpha blocker, primarily used for the short-term control of pheochromocytoma.

Answer 242

a) Urinary retention in benign prostatic hyperplasia Rationale: Alpha1 selective blockers are effective in reducing urinary retention in benign prostatic hyperplasia and managing hypertension.

Answer 243

c) Coronary artery disease Rationale: Phenoxybenzamine is not recommended for patients with coronary artery disease due to its cardiovascular effects.

Answer 244

a) Reflex tachycardia Rationale: Both Phenoxybenzamine and Phentolamine may cause orthostatic hypotension and reflex tachycardia.

Answer 245

b) Decrease blood pressure Rationale: Alpha1 selective blockers decrease blood pressure by inhibiting the constriction of arterioles and veins.

Answer 246

c) Limited use due to potential side effects Rationale: Yohimbine's use is limited because of inconsistent efficacy and potential side effects.

Answer 247

b) Control high blood pressure Rationale: Phentolamine is used in pheochromocytoma primarily to control high blood pressure associated with the condition.

Answer 248

b) Their ability to reduce urinary retention Rationale: Alpha1 selective blockers are chosen for benign prostatic hyperplasia because they effectively reduce urinary retention.

Answer 249

b) Hypotension Rationale: Phenoxybenzamine can cause orthostatic hypotension, a significant concern in its toxicity profile.

Answer 250

c) Decrease peripheral vascular resistance Rationale: Alpha blockers decrease peripheral vascular resistance, leading to a reduction in blood pressure.

Answer 251

c) Control hypertension Rationale: Phentolamine is used in pheochromocytoma to control the hypertension that often accompanies the condition.

Answer 252

c) Treat hypotension Rationale: Alpha blockers can be used in spinal anesthesia to manage hypotension, a common complication of this procedure.

Answer 253

b) Improving urine flow Rationale: Alpha1 selective blockers improve urine flow in BPH by relaxing muscles in the prostate and bladder neck.

Answer 254

b) Blood pressure Rationale: Phenoxybenzamine is used in hypertension secondary to spinal cord injuries primarily due to its blood pressure-lowering effects.

Answer 255

c) Cause significant blood pressure changes Rationale: Phenoxybenzamine can cause significant changes in blood pressure, which can be risky for patients with coronary artery disease.

Answer 256

c) Sudden drop in blood pressure upon standing Rationale: The first-dose phenomenon refers to a sudden drop in blood pressure upon standing, often experienced after the first dose of alpha1 selective blockers.

Answer 257

b) Reducing renin secretion Rationale: Beta blockers decrease cardiac output and reduce renin secretion, which leads to lower blood pressure.

Answer 258

b) Decreasing heart rate and contractility Rationale: Beta blockers reduce heart rate and contractility, decreasing oxygen consumption by the heart muscle and managing chest pain in angina.

Answer 259

b) Reduce mortality by decreasing heart workload Rationale: Beta blockers reduce the workload on the heart post-myocardial infarction, thereby reducing mortality.

Answer 260

b) Supraventricular Tachycardia (SVT) Rationale: Propranolol is notably used in SVT as it slows AV conduction and velocity, helping control rapid heart rates.

Answer 261

b) Decrease aqueous humor secretion Rationale: Beta blockers decrease the secretion of aqueous humor in the eye, thereby reducing intraocular pressure in glaucoma.

Answer 262

a) Beta1 receptors Rationale: Selective beta blockers (A-M “olols”) primarily block beta1 receptors and are safer for patients with respiratory issues.

Answer 263

b) Both beta1 and beta2 receptors Rationale: Nonselective beta blockers (N-Z) act on both beta1 and beta2 receptors, having a broader range of effects.

Answer 264

a) Beta-blocking and alpha-agonist properties Rationale: Labetalol and Carvedilol have both beta-blocking and alpha-agonist properties, making them useful in treating hypertension and heart failure.

Answer 265

b) The shortest-acting beta blocker Rationale: Esmolol is the shortest-acting beta blocker, often used in emergency settings or when rapid adjustments in dosage are needed.

Answer 266

b) Reduces heart rate and workload Rationale: Beta blockers are effective in hypertension as they reduce heart rate and workload, leading to lower blood pressure.

Answer 267

a) Reducing the demand for oxygen by the heart Rationale: Beta blockers manage chest pain associated with angina by reducing the heart's demand for oxygen.

Answer 268

d) All of the above Rationale: Beta blockers are used post-myocardial infarction to reduce the workload on the heart, decreasing the risk of further heart attacks, arrhythmias, and heart failure.

Answer 269

b) Their dual action as beta blockers and alpha-agonists Rationale: The combined beta-blocking and alpha-agonist properties of labetalol and carvedilol make them particularly effective in treating hypertension and heart failure.

Answer 270

b) Uncontrolled asthma Rationale: Beta blockers, especially nonselective ones, are contraindicated in patients with uncontrolled asthma due to their potential to cause bronchoconstriction.

Answer 271

b) Orthostatic hypotension Rationale: The first-dose phenomenon with alpha blockers often includes orthostatic hypotension, causing dizziness and lightheadedness upon standing.

Answer 272

b) Decrease intraocular pressure Rationale: In glaucoma, beta blockers are used to decrease intraocular pressure by reducing the secretion of aqueous humor.

Answer 273

b) Reducing the heart's oxygen demand Rationale: Beta blockers help manage angina by reducing heart rate and contractility, thereby decreasing the heart's oxygen demand and preventing chest pain.

Answer 274

b) Slow down AV conduction Rationale: Propranolol is used in SVT to slow AV conduction and velocity, controlling rapid heart rates.

Answer 275

b) Reduce blood pressure and heart workload Rationale: Carvedilol's beta-blocking and alpha-agonist properties reduce blood pressure and heart workload, improving heart failure symptoms.

Answer 276

a) Decrease renin secretion Rationale: Beta blockers decrease renin secretion, which reduces blood pressure by decreasing cardiac output and vascular resistance.

Answer 277

a) The heart Rationale: Beta1 blockers primarily affect beta1-adrenergic receptors, which are predominantly located in the heart.

Answer 278

b) Avoid bronchoconstriction Rationale: For hypertensive patients with conditions like asthma, cardioselective beta1 blockers are preferred to avoid bronchoconstriction.

Answer 279

b) Effects on the lungs and other tissues Rationale: At high doses, some beta1 blockers can block beta2 receptors, affecting the lungs and other tissues beyond the heart.

Answer 280

b) Angina, hypertension, thyroid storm, panic attacks, and migraines Rationale: Nonselective beta blockers like Propranolol are effective for various conditions including angina, hypertension, thyroid storm, panic attacks, and migraines.

Answer 281

a) Hypertension prone to bradycardia Rationale: Beta blockers like Acebutolol, which possess agonistic properties, are suitable for patients with hypertension who are prone to bradycardia.

Answer 282

b) Beta and alpha blocking properties Rationale: Labetalol and Carvedilol have both beta and alpha blocking properties, making them effective in treating hypertension.

Answer 283

b) Acute congestive heart failure Rationale: Beta blockers with alpha blocking properties, such as Labetalol and Carvedilol, should not be used in acute congestive heart failure.

Answer 284

b) Impotence Rationale: Common side effects of beta blocker toxicity include impotence, exacerbation of asthma, bradycardia, AV block, congestive heart failure, sedation, and sleep alterations.

Answer 285

a) Blood glucose and lipid metabolism Rationale: Nonselective beta blockers can impact blood glucose and lipid metabolism, decreasing glycogenolysis and affecting VLDL and HDL levels.

Answer 286

c) Reduce the workload of the heart Rationale: Beta blockers are effective in reducing hypertension as they decrease the workload of the heart and blood vessel tension.

Answer 287

b) Bradycardia Rationale: Beta blockers with agonistic properties, like Acebutolol, do not significantly lower heart rate due to their agonistic effects.

Answer 288

a) The risk of bronchoconstriction Rationale: Nonselective beta blockers can cause bronchoconstriction, which is a concern for patients with asthma.

Answer 289

b) Decreasing intraocular pressure Rationale: Beta blockers are effective in glaucoma as they decrease intraocular pressure, often by reducing the production of aqueous humor.

Answer 290

a) Decrease oxygen consumption by the heart Rationale: Beta blockers help in managing angina by reducing heart rate and contractility, thereby decreasing oxygen consumption by the heart muscle.

Answer 291

c) Can exacerbate heart failure symptoms Rationale: Beta blockers can exacerbate symptoms of uncontrolled heart failure due to their effect on decreasing cardiac output.

Answer 292

b) Decrease heart workload Rationale: Post-myocardial infarction, beta blockers are used to decrease the workload on the heart, reducing mortality.

Answer 293

b) Asthma Rationale: Cardioselective beta1 blockers are preferred in hypertensive patients with respiratory issues like asthma to avoid bronchoconstriction.

Answer 294

a) Impotence Rationale: Impotence is a common side effect of both selective and nonselective beta blockers.

Answer 295

b) Decrease AV conduction Rationale: In supraventricular tachycardia, beta blockers like Propranolol are used to decrease AV conduction, controlling rapid heart rates.

Answer 296

b) Thyroid storm, panic attacks, and migraines Rationale: Nonselective beta blockers like Propranolol are effective in treating various conditions including thyroid storm, panic attacks, and migraines.

Answer 297

b) Inhibiting the release of norepinephrine Rationale: Indirect adrenergic antagonists work by reducing the release of norepinephrine from nerve endings or depleting its stores, thereby diminishing sympathetic activity.

Answer 298

b) Hypertension Rationale: Guanethidine is primarily used to treat hypertension by reducing sympathetic tone, leading to decreased blood pressure.

Answer 299

b) Orthostatic hypotension Rationale: Common side effects of Guanethidine include orthostatic hypotension and sexual dysfunction.

Answer 300

a) Depleting norepinephrine from nerve endings Rationale: Reserpine works by depleting norepinephrine (and other monoamines like serotonin and dopamine) from nerve endings.

Answer 301

b) Central nervous system Rationale: While its use for cardiac or autonomic nervous system problems has decreased, Reserpine is sometimes used in psychiatric settings due to its CNS effects.

Answer 302

b) Inhibiting the release of norepinephrine Rationale: Guanethidine lowers blood pressure by inhibiting the release of norepinephrine from sympathetic nerve endings.

Answer 303

a) Bradycardia Rationale: Reserpine can cause bradycardia and central nervous system depression.

Answer 304

b) Decrease sympathetic tone Rationale: Indirect adrenergic antagonists treat hypertension by reducing the sympathetic tone, thereby lowering blood pressure.

Answer 305

c) Inhibition of sympathetic nervous system Rationale: Guanethidine commonly causes sexual dysfunction as a side effect due to its inhibitory effect on the sympathetic nervous system.

Answer 306

b) Depleting monoamines from nerve endings Rationale: Reserpine's unique mechanism in treating hypertension involves depleting monoamines like norepinephrine from nerve endings.

Answer 307

b) Depression and sedation Rationale: Indirect adrenergic antagonists, like Reserpine, can cause CNS depression and bradycardia.

Answer 308

b) Decreased norepinephrine release Rationale: Guanethidine inhibits the release of norepinephrine from sympathetic nerve endings, leading to decreased blood pressure.

Answer 309

a) Serotonin and dopamine levels Rationale: Reserpine's use in psychiatric settings is due to its effect on central neurotransmitters like serotonin and dopamine.

Answer 310

b) Side effects on the central nervous system Rationale: Reserpine's use in cardiac or autonomic nervous system problems has decreased due to its side effects on the CNS.

Answer 311

c) Ability to decrease sympathetic nervous system activity Rationale: Indirect adrenergic antagonists manage hypertension by reducing sympathetic nervous system activity, leading to decreased blood pressure.

Answer 312

a) Orthostatic hypotension Rationale: A common challenge with Guanethidine is managing its side effect of orthostatic hypotension, a drop in blood pressure upon standing.

Answer 313

c) Depleting norepinephrine stores Rationale: Reserpine lowers blood pressure by depleting norepinephrine (and other monoamines) from nerve endings.

Answer 314

c) Sexual dysfunction Rationale: Guanethidine can cause sexual dysfunction due to its inhibitory effect on the sympathetic nervous system.

Answer 315

c) Effect on central neurotransmitters Rationale: Reserpine is sometimes used in psychiatric settings due to its effect on central neurotransmitters, leading to CNS depression.

Answer 316

c) Decreasing norepinephrine release Rationale: Guanethidine reduces blood pressure primarily by decreasing norepinephrine release from sympathetic nerve endings.

Answer 317

a) Increasing the outflow of aqueous humor Rationale: Epinephrine works in glaucoma by increasing the outflow of aqueous humor, thereby reducing intraocular pressure.

Answer 318

a) Mydriasis Rationale: Epinephrine may cause mydriasis (pupil dilation) and stinging; it is not recommended for closed-angle glaucoma.

Answer 319

c) Reducing aqueous humor synthesis Rationale: Brimonidine primarily works by reducing aqueous humor synthesis, making it effective in lowering intraocular pressure.

Answer 320

a) Decrease aqueous humor secretion Rationale: Beta blockers such as Timolol decrease aqueous humor secretion, which helps in reducing intraocular pressure.

Answer 321

a) Enhancing the drainage of aqueous humor Rationale: Pilocarpine contracts the ciliary muscle, leading to the opening of the trabecular meshwork and enhancing the drainage of aqueous humor.

Answer 322

b) Miosis Rationale: Cholinomimetics can cause miosis (pupil constriction) and potentially decrease vision quality due to the 'pinhole effect.'

Answer 323

b) Beta blocker Rationale: Timolol is a beta blocker that decreases aqueous humor secretion, widely used in glaucoma treatment.

Answer 324

c) Contract the ciliary muscle Rationale: Echothiophate contracts the ciliary muscle, enhancing the drainage of aqueous humor.

Answer 325

b) Not causing significant pupillary or vision changes Rationale: Betaxolol generally does not cause significant pupillary or vision changes, making it a mainstay in glaucoma treatment.

Answer 326

a) Does not cause pupillary or vision changes Rationale: Brimonidine is more selective in its action, typically not causing pupillary or vision changes.

Answer 327

b) The 'pinhole effect' Rationale: Cholinomimetics like Pilocarpine can cause the 'pinhole effect,' a reduced field of vision, due to pupil constriction.

Answer 328

b) Increasing intraocular pressure Rationale: Epinephrine is not recommended for closed-angle glaucoma as it may increase intraocular pressure.

Answer 329

b) Decreases aqueous humor production Rationale: Carteolol, like other beta blockers, decreases aqueous humor production, thereby reducing intraocular pressure.

Answer 330

c) Cholinomimetics Rationale: Physostigmine, as a cholinomimetic, contracts the ciliary muscle, enhancing aqueous humor drainage.

Answer 331

a) Reduce intraocular pressure by decreasing aqueous humor secretion Rationale: Beta blockers like Timolol are effective in glaucoma due to their ability to decrease aqueous humor secretion, reducing intraocular pressure.

Answer 332

c) Enhance aqueous humor outflow Rationale: Cholinomimetics increase the outflow of aqueous humor by contracting the ciliary muscle, thereby lowering intraocular pressure.

Answer 333

b) The lack of effect on pupil size and vision Rationale: Brimonidine, as an alpha agonist, is more selective and typically does not cause significant changes in pupil size or vision.

Answer 334

b) Their minimal impact on pupillary or vision changes Rationale: Beta blockers are widely used in glaucoma treatment due to their efficacy and fewer visual side effects.

Answer 335

a) Assessing the type of glaucoma before drug selection Rationale: Choosing the right glaucoma medication, such as avoiding Epinephrine in closed-angle glaucoma, underscores the need for careful assessment of the type of glaucoma.

Answer 336

b) Reduced field of vision Rationale: The 'pinhole effect' from cholinomimetics results in a reduced field of vision due to pupil constriction, which can impact vision quality.

Autonomics Flashcards

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