CAD

Question 1

What is methemoglobinemia, and how can it occur with nitrate therapy?

Answer 1

Methemoglobinemia is a rare adverse effect where hemoglobin is oxidized, reducing its oxygen-carrying capacity. It can occur with high doses of nitrates, leading to cyanosis and hypoxia that does not respond to oxygen therapy.

Question 2

What steps should be followed to ensure proper client identification before administering transdermal medication?

Answer 2

The nurse should use two unique identifiers, such as the client’s name and date of birth, to verify identity according to facility protocol. This step prevents errors and ensures the correct medication is administered to the correct client.

Question 3

What key teaching points should a nurse provide to a client starting on PCSK9 inhibitors?

Answer 3

Clients should be taught proper subcutaneous injection techniques, the importance of rotating injection sites, and the need to store the medication in the refrigerator. They should also be advised to report any hypersensitivity or injection site reactions.

Question 4

What measures should a nurse take to ensure client safety after applying a transdermal patch?

Answer 4

The nurse should place the call light and personal items within easy reach, lower the bed to its lowest position, and ensure the bed brakes are locked to reduce the risk of falls and injury.

Question 5

Which contraindications should a nurse assess for before administering thrombolytics to a client?

Answer 5

Contraindications include recent intracranial hemorrhage, active bleeding, severe hypertension (systolic >180 mm Hg or diastolic >110 mm Hg), ischemic stroke within the last 3 months, intracranial lesions, recent surgery or trauma, and pregnancy.

Question 6

What are the main indications for using P2Y12 receptor inhibitors in acute coronary syndrome?

Answer 6

P2Y12 inhibitors are indicated for unstable angina, NSTEMI, STEMI, and secondary prevention of thrombotic events in clients undergoing PCI or with a history of MI.

Question 7

Which time frame is recommended for administering thrombolytics after a client arrives at the emergency department with an acute MI?

Answer 7

Thrombolytics should be administered within 30 minutes of arrival at the emergency department, often referred to as the ‘door-to-needle’ time.

Question 8

How do nitrates reduce afterload, and what is the effect on the heart?

Answer 8

Nitrates cause vasodilation in peripheral arteries, reducing systemic vascular resistance and therefore afterload. This decreases the effort required by the left ventricle to pump blood, reducing myocardial oxygen demand.

Question 9

What instructions should clients follow to accurately measure their blood pressure at home while taking beta-blockers?

Answer 9

Clients should rest for 5 minutes before measuring, sit upright with back support, place both feet flat on the floor, avoid talking during measurement, and use an appropriately sized cuff. They should record the readings in a notebook.

Question 10

Why are nitrates contraindicated in clients taking phosphodiesterase-5 (PDE-5) inhibitors?

Answer 10

Nitrates are contraindicated with PDE-5 inhibitors because the combination can cause severe hypotension due to their additive vasodilatory effects.

Question 11

What are the common adverse effects of thrombolytic therapy that require immediate medical attention?

Answer 11

Common adverse effects include major bleeding, intracranial hemorrhage, and anaphylaxis, all of which require immediate medical evaluation and intervention.

Question 12

What are the potential side effects of omega-3 fatty acid supplementation?

Answer 12

Potential side effects include GI disturbances (nausea, diarrhea, fishy taste, belching), prolonged bleeding time, and, in rare cases, atrial fibrillation or flutter.

Question 13

What are the key administration instructions for nitroglycerin transdermal patches?

Answer 13

Nitroglycerin patches should be applied to a hairless area, removed before MRI or cardioversion, and rotated daily to prevent skin irritation. Patches should be removed during nitrate-free periods as prescribed.

Question 14

Which antiplatelet medication class is suitable for rapid onset during PCI and why?

Answer 14

Cangrelor, an IV P2Y12 inhibitor, is suitable due to its rapid onset of action, making it ideal for use during the periprocedural period in clients undergoing PCI.

Question 15

What is the primary mechanism by which beta-blockers reduce myocardial oxygen demand in clients with angina?

Answer 15

Beta-blockers reduce myocardial oxygen demand by decreasing heart rate and reducing the force of heart muscle contraction, thereby lowering the workload on the heart.

Question 16

Why is it important to monitor clients taking omega-3 fatty acids for bleeding risks?

Answer 16

Omega-3 fatty acids reduce platelet aggregation, which can prolong bleeding time and increase the risk of bleeding, especially in clients taking anticoagulant or antiplatelet medications.

Question 17

What is the primary mechanism by which organic nitrates alleviate angina symptoms?

Answer 17

Organic nitrates alleviate angina symptoms by being converted into nitric oxide (NO) in the body. This leads to smooth muscle relaxation in blood vessels, causing vasodilation, which decreases myocardial oxygen demand and relieves chest pain.

Question 18

Why is it important to monitor potassium levels in clients prescribed ACE inhibitors or ARBs?

Answer 18

ACE inhibitors and ARBs can cause hyperkalemia, especially in clients with renal impairment or those taking potassium supplements or potassium-sparing diuretics. Hyperkalemia can lead to life-threatening cardiac arrhythmias, which require immediate intervention.

Question 19

What are common side effects of HMG-CoA reductase inhibitors (statins) that clients should be educated about?

Answer 19

Common side effects of statins include muscle pain (myalgia), headaches, gastrointestinal upset, and elevated liver enzymes. Clients should report persistent muscle pain or signs of liver dysfunction, such as yellowing of the skin or eyes.

Question 20

What physiological process leads to the development of angina in clients with coronary artery disease (CAD)?

Answer 20

Angina develops when the oxygen demand of the heart exceeds the oxygen supply due to reduced coronary blood flow. This is often caused by atherosclerosis or vasospasm of the coronary arteries, leading to myocardial ischemia.

Question 21

What is the significance of the irreversible inhibition of COX-1 by aspirin on platelet function?

Answer 21

Since platelets lack the ability to synthesize new COX-1 enzymes, aspirin’s effects last for the entire lifespan of the platelet (7-10 days), ensuring prolonged inhibition of platelet aggregation.

Question 22

What risk factors in a client’s history increase the likelihood of developing myocardial infarction (MI) secondary to coronary artery disease (CAD)?

Answer 22

Key risk factors include hypertension, hyperlipidemia, smoking, diabetes, and a family history of CAD, as these contribute to a higher likelihood of MI.

Question 23

How does the presentation of stable angina differ from that of unstable angina?

Answer 23

Stable angina is typically triggered by physical activity, stress, or cold exposure and resolves with rest or nitroglycerin. Unstable angina may occur at rest, persists longer, and does not fully resolve with rest or medication, indicating a higher risk of myocardial infarction.

Question 24

Which common side effects of ranolazine should clients monitor and report if they persist or worsen?

Answer 24

Clients should monitor and report side effects such as dizziness, headaches, nausea, palpitations, constipation, and blurred vision, especially if they persist or worsen as these may affect adherence.

Question 25

Which dietary changes should be recommended to a client recovering from a myocardial infarction to promote heart health?

Answer 25

Clients recovering from a myocardial infarction should adopt a diet low in saturated fats, trans fats, and cholesterol. They should increase their intake of fruits, vegetables, whole grains, lean proteins, and healthy fats like those found in nuts and fish. Reducing sodium and added sugars is also essential to manage blood pressure and overall cardiovascular health.

Question 26

Which populations should exercise caution when using omega-3 fatty acid supplements?

Answer 26

Populations with a history of atrial fibrillation, bleeding disorders, liver impairment, or known allergies to seafood should exercise caution when using omega-3 fatty acids.

Question 27

Why is the timing of reperfusion critical in determining the long-term effects of a myocardial infarction (MI)?

Answer 27

The timing of reperfusion is critical because it determines the amount of cardiac muscle tissue that is saved, reducing the extent of muscle injury and preventing further complications.

Question 28

What client teaching is important regarding the storage and potency of sublingual nitroglycerin?

Answer 28

Clients should store sublingual nitroglycerin in its original, amber-colored container, protected from heat, air, and moisture. The tablets should be replaced every 6 months to ensure potency.

Question 29

What is the primary mechanism of action of aspirin as an antiplatelet agent?

Answer 29

Aspirin irreversibly inhibits the COX-1 enzyme, leading to decreased production of thromboxane A2 (TXA2), which reduces platelet aggregation and prevents blood clot formation.

Question 30

What renal function parameters must be assessed before initiating ranolazine therapy?

Answer 30

Creatinine clearance (CrCl) should be evaluated prior to starting ranolazine. It is contraindicated in clients with CrCl below 30 mL/min due to the risk of elevated drug levels and adverse effects.

Question 31

Why are PAR-1 inhibitors contraindicated in clients with a history of stroke or intracranial bleeding?

Answer 31

PAR-1 inhibitors significantly increase the risk of bleeding, including intracranial hemorrhage, making them unsafe for clients with prior strokes or brain bleeding.

Question 32

What are the common side effects of organic nitrates, and what causes them?

Answer 32

Common side effects include headache, orthostatic hypotension, flushing, dizziness, and palpitations. These are caused by the vasodilatory effects of nitrates, which increase blood flow and lower blood pressure.

Question 33

Why is unfractionated heparin (UFH) commonly used in the acute management of myocardial infarction (MI)?

Answer 33

UFH is preferred due to its rapid onset of action, reversibility, and effectiveness in preventing further clot formation and reducing thrombus extension or embolization.

Question 34

Why is dual-antiplatelet therapy (DAPT) recommended for clients after an MI?

Answer 34

DAPT, which combines aspirin and a P2Y12 inhibitor, is recommended to reduce the risk of recurrent ischemic events, maintain stent patency, and prevent thrombotic complications for at least 12 months after an MI.

Question 35

What is the recommended course of action if chest pain persists after three doses of sublingual nitroglycerin?

Answer 35

If chest pain persists after three doses of sublingual nitroglycerin, the client should immediately call emergency services, as persistent pain may indicate a myocardial infarction (MI).

Question 36

What is the primary pathophysiological process leading to a myocardial infarction, and how does it result in myocardial cell death?

Answer 36

The primary process leading to a myocardial infarction is the rupture of an atherosclerotic plaque in a coronary artery, which triggers the formation of a thrombotic occlusion. This occlusion blocks blood flow, causing ischemia. If ischemia persists for 20 to 40 minutes, irreversible myocardial cell death and necrosis occur due to oxygen deprivation.

Question 37

What dietary advice should be given to clients taking ranolazine to minimize potential side effects?

Answer 37

Clients should avoid grapefruit juice, which increases ranolazine levels, and increase fiber and water intake to prevent constipation, a common side effect.

Question 38

Which findings in a client with chest pain suggest a possible myocardial infarction (MI) that requires immediate follow-up?

Answer 38

Chest discomfort radiating to the arm, jaw pain, and shortness of breath are critical findings that suggest myocardial ischemia and require immediate follow-up.

Question 39

What are some possible long-term complications of a myocardial infarction (MI)?

Answer 39

Long-term complications of an MI include chronic angina, repeat MI, dysrhythmias, heart failure, shock, cardiac rupture, blood clots, and fluid accumulation around the heart.

Question 40

What clinical signs suggest the development of angioedema in a client taking ACE inhibitors?

Answer 40

Angioedema is characterized by swelling of the subcutaneous or soft tissues, commonly seen in the lips, face, neck, and oral mucous membranes. It is a medical emergency if associated with difficulty breathing or anaphylaxis

Question 41

What additional cardiovascular benefits do statins provide beyond lowering LDL cholesterol?

Answer 41

Statins stabilize atherosclerotic plaques, improve endothelial function, reduce inflammation, and decrease thrombogenicity, which collectively reduce the risk of adverse cardiovascular events such as myocardial infarction and stroke.

Question 42

What is the role of glycoprotein IIb/IIIa inhibitors in acute coronary syndrome management?

Answer 42

Glycoprotein IIb/IIIa inhibitors, such as eptifibatide and tirofiban, prevent fibrinogen and von Willebrand factor from binding to platelets, which inhibits platelet aggregation. They are used in high-risk clients undergoing PCI.

Question 43

Why are clients prescribed both statins and lifestyle modifications for hypercholesterolemia?

Answer 43

Lifestyle modifications such as a heart-healthy diet and regular exercise complement statins by further improving cholesterol levels and overall cardiovascular health. This combined approach is more effective in reducing the risk of coronary artery disease.

Question 44

What is the primary mechanism of action for HMG-CoA reductase inhibitors (statins)?

Answer 44

Statins inhibit the enzyme HMG-CoA reductase in the liver, which is a rate-limiting step in cholesterol biosynthesis. This reduces the production of cholesterol and lowers LDL levels in the bloodstream.

Question 45

What cardiovascular benefits do omega-3 fatty acids provide post-MI?

Answer 45

Post-MI, omega-3 fatty acids reduce triglyceride levels, stabilize cardiac rhythm, lower blood pressure, decrease platelet aggregation, and modulate inflammation, contributing to improved cardiovascular outcomes.

Question 46

How does the combination of aspirin and clopidogrel enhance antiplatelet effects?

Answer 46

Aspirin inhibits COX-1 and thromboxane A2 production, while clopidogrel blocks ADP-mediated platelet activation via the P2Y12 receptor, providing complementary mechanisms to prevent clot formation.

Question 47

Which calcium channel blockers are contraindicated in clients with heart failure with reduced ejection fraction?

Answer 47

Diltiazem and verapamil are contraindicated in clients with heart failure with reduced ejection fraction because they can worsen cardiac output and exacerbate heart failure symptoms.

Question 48

What are the primary physical symptoms of angina and how might they impact a client’s ability to perform daily activities?

Answer 48

The primary physical symptoms of angina include chest discomfort or pain, shortness of breath, nausea, and sweating. These symptoms can limit a client’s ability to perform daily activities, exercise, or engage in social interactions due to their distressing nature.

Question 49

What precautions should a nurse take when handling a transdermal patch to avoid exposure to the medication?

Answer 49

The nurse should avoid touching the medicated side of the patch and wear gloves when handling it. Additionally, fold the old patch with the adhesive sides facing each other before disposal.

Question 50

Why is it critical to assess the client’s skin prior to applying a transdermal patch?

Answer 50

Assessing the skin ensures the site is clean, dry, and intact, which is necessary for proper medication absorption. Open wounds or breaks in the skin could alter absorption, while areas with hair growth may impede adherence.

Question 51

How does ranolazine's effect on heart rate and blood pressure differentiate it from other antianginal medications?

Answer 51

Ranolazine does not significantly alter heart rate or blood pressure, making it ideal for clients who have low baseline blood pressure or heart rate compared to other antianginal drugs.

Question 52

What precautions should be taken when using nitrates in clients with right ventricular infarction?

Answer 52

In clients with right ventricular infarction, nitrates should be used cautiously or avoided because they can cause severe hypotension by reducing preload, further compromising cardiac output.

Question 53

How do omega-3 fatty acids influence triglyceride levels in the body?

Answer 53

Omega-3 fatty acids lower triglyceride levels by suppressing lipogenic gene expression, increasing beta-oxidation, and enhancing the breakdown and clearance of triglycerides.

Question 54

What is the mechanism of action of PAR-1 inhibitors such as vorapaxar?

Answer 54

PAR-1 inhibitors selectively block the protease-activated receptor-1 on platelets, preventing thrombin-mediated platelet activation and reducing thrombotic events.

Question 55

How do PCSK9 inhibitors lower LDL cholesterol levels in the blood?

Answer 55

PCSK9 inhibitors prevent the degradation of LDL receptors by binding to the PCSK9 enzyme. This increases the number of LDL receptors available to remove LDL cholesterol from the bloodstream.

Question 56

Why might clients with stable angina adopt a sedentary lifestyle, and what are the potential long-term consequences of this behavior?

Answer 56

Clients with stable angina may adopt a sedentary lifestyle to avoid triggers that provoke symptoms. This behavior can lead to further negative cardiovascular health impacts, such as reduced physical fitness, weight gain, and increased risk of other cardiovascular conditions.

Question 57

Which form of omega-3 fatty acid supplementation is recommended for vegetarians?

Answer 57

Vegetarians can use algal oil supplements, which provide omega-3 fatty acids in a plant-based form.

Question 58

How do anticoagulants differ from antiplatelet medications in their mechanism of action?

Answer 58

Anticoagulants interfere with the body's clotting cascade to prevent the formation of fibrin, while antiplatelet medications prevent platelets from sticking together and forming clots.

Question 59

How do P2Y12 receptor inhibitors like clopidogrel prevent platelet aggregation?

Answer 59

P2Y12 receptor inhibitors irreversibly block the P2Y12 ADP receptor on the surface of platelets, preventing ADP-induced platelet activation and aggregation.

Question 60

What is the primary mechanism of action for ACE inhibitors in the management of post-MI conditions?

Answer 60

ACE inhibitors work by competitively inhibiting the angiotensin-converting enzyme (ACE), which prevents the conversion of angiotensin I to angiotensin II, a potent vasoconstrictor. This results in vasodilation, reduced afterload, and decreased aldosterone secretion, which helps improve cardiac function and survivability post-MI.

Question 61

In what clinical scenarios should antiplatelet therapy be discontinued prior to surgery?

Answer 61

Antiplatelet therapy should be discontinued before surgeries with a high risk of bleeding, typically 5-7 days prior for medications like clopidogrel, under the guidance of the prescribing provider.

Question 62

In what situations is intravenous nitroglycerin commonly used, and why?

Answer 62

Intravenous nitroglycerin is commonly used in acute coronary syndromes, hypertensive emergencies, and acute congestive heart failure exacerbations due to its quick titratable effects and ability to rapidly relieve symptoms.

Question 63

Why might sublingual nitroglycerin be preferred for acute anginal episodes?

Answer 63

Sublingual nitroglycerin is preferred for acute anginal episodes due to its rapid onset of action, bypassing first-pass metabolism, and providing quick relief within 1-3 minutes.

Question 64

Why is it important to monitor liver function tests in clients taking statins?

Answer 64

Statins can cause elevated liver enzymes and, in rare cases, liver toxicity. Monitoring liver function ensures early detection of hepatotoxicity and allows for timely adjustments in the treatment plan.

Question 65

In which situations are PCSK9 inhibitors typically indicated?

Answer 65

PCSK9 inhibitors are indicated for clients with high cardiovascular risk, familial hypercholesterolemia, or those who do not achieve adequate LDL reduction with statins alone. They are also used in secondary prevention of myocardial infarction and stroke.

Question 66

What is the role of high-density lipoprotein (HDL) in cardiovascular health?

Answer 66

High-density lipoprotein (HDL), often called 'good cholesterol,' helps remove excess cholesterol from the bloodstream and transports it to the liver for excretion, thereby reducing the risk of atherosclerosis and cardiovascular disease.

Question 67

What dietary sources are rich in EPA and DHA, the long-chain omega-3 fatty acids?

Answer 67

Dietary sources rich in EPA and DHA include cold-water fatty fish such as salmon, mackerel, tuna, herring, and sardines, as well as fish oil supplements.

Question 68

Which contraindications must be considered before prescribing beta-blockers like metoprolol?

Answer 68

Contraindications include severe bradycardia, severe hypotension, heart block, decompensated heart failure, cardiogenic shock, bronchial asthma, chest pain related to cocaine use, and untreated pheochromocytoma

Question 69

What advantages do low molecular weight heparins (LMWH) like enoxaparin have over unfractionated heparin

Answer 69

(UFH) in MI treatment? LMWHs have a longer duration of anticoagulant effect, more predictable pharmacokinetics, and a lower risk of heparin-induced thrombocytopenia compared to UFH.

Question 70

How do nitrates help improve oxygen delivery to the heart during an anginal episode?

Answer 70

Nitrates dilate coronary arteries, increasing blood flow and oxygen delivery to ischemic areas of the myocardium, which helps relieve anginal pain and improve heart function.

Question 71

What are the systemic manifestations commonly experienced during the acute stages of a myocardial infarction (MI)?

Answer 71

Systemic manifestations during the acute stages of an MI include chest pain, nausea, vomiting, dyspnea, and dizziness.

Question 72

How do omega-3 fatty acids help stabilize atherosclerotic plaques in the management of MI?

Answer 72

Omega-3 fatty acids stabilize atherosclerotic plaques by reducing inflammation, decreasing oxidative stress, and inhibiting leukocyte adhesion and movement, which helps prevent plaque rupture and subsequent cardiovascular events.

Question 73

How does the vasodilation caused by organic nitrates affect preload and myocardial oxygen demand?

Answer 73

Vasodilation caused by organic nitrates increases venous capacity, reducing preload. This decreases the stretch of cardiac muscle cells during diastole, ultimately lowering myocardial oxygen demand and alleviating angina symptoms.

Question 74

How can the fear of experiencing angina attacks affect a client’s mental health and overall quality of life?

Answer 74

The fear of experiencing angina attacks can lead to anxiety and depression, which may further diminish a client’s quality of life by increasing emotional distress and reducing their engagement in social and physical activities.

Question 75

What factors can trigger an episode of stable angina, and how do they affect the heart muscle?

Answer 75

Triggers for stable angina include physical exertion, emotional stress, and exposure to cold temperatures. These triggers increase the heart's oxygen demand, which cannot be met due to narrowed coronary arteries, resulting in myocardial ischemia and chest discomfort.

Question 76

What are the three main types of omega-3 fatty acids, and which sources provide each?

Answer 76

The three main types of omega-3 fatty acids are EPA, DHA, and ALA. EPA and DHA are found in fish, shellfish, and fish oil supplements, while ALA is present in plant-based sources like flaxseed, walnuts, and chia seeds.

Question 77

What is a key nursing consideration when administering aspirin to clients with a history of GI bleeding?

Answer 77

Aspirin should be given with food or an enteric-coated formulation to minimize GI irritation, and clients should be monitored closely for signs of GI bleeding.

Question 78

What is the primary mechanism of action for calcium channel blockers in vascular smooth muscle?

Answer 78

Calcium channel blockers inhibit the inward movement of calcium in vascular smooth muscle, leading to reduced contractility, increased relaxation, and vasodilation.

Question 79

What are the potential adverse effects of glycoprotein IIb/IIIa inhibitors?

Answer 79

Adverse effects include bleeding, thrombocytopenia, hypotension, bradycardia, and allergic reactions. Bleeding risk is particularly significant and requires monitoring.

Question 80

What characteristics of chest pain should a nurse assess in a client suspected of having coronary artery disease (CAD)?

Answer 80

The nurse should assess the location, intensity, duration, radiation (e.g., to the arm or jaw), and factors that exacerbate or alleviate the pain, as well as any previous attempts by the client to relieve the pain.

Question 81

Why is it necessary to monitor the QT interval in clients taking ranolazine?

Answer 81

Ranolazine can cause QT prolongation, increasing the risk of life-threatening arrhythmias. Monitoring the QT interval ensures early detection and intervention to prevent complications.

Question 82

Which medication should be administered first to a client experiencing acute chest pain suspected of myocardial infarction (MI)?

Answer 82

Nitroglycerin should be administered first to relieve chest pain by decreasing afterload and increasing cardiac output.

Question 83

What is the significance of elevated cardiac troponins in a client with chest pain?

Answer 83

Elevated cardiac troponins indicate myocardial cell injury or necrosis, which is consistent with myocardial infarction (MI) and requires urgent intervention.

Question 84

What factors should providers assess before selecting an anticoagulant for long-term use after MI?

Answer 84

Providers should assess the client’s specific risk factors (e.g., atrial fibrillation, mechanical heart valves), renal function, bleeding risk, and concomitant medications.

Question 85

Why are beta 1 selective beta-blockers, such as metoprolol, preferred for clients with respiratory conditions like asthma?

Answer 85

Beta 1 selective beta-blockers primarily target beta 1 adrenergic receptors in the heart and are less likely to affect beta 2 receptors in the lungs, reducing the risk of bronchospasm in clients with respiratory conditions.

Question 86

Why should gloves be worn when applying nitroglycerin ointment?

Answer 86

Gloves should be worn to prevent accidental absorption of nitroglycerin through the skin, which can cause systemic effects such as hypotension, headache, or dizziness in the person administering the medication.

Question 87

Why should caution be exercised when using calcium channel blockers in clients with acute myocardial infarction or unstable angina?

Answer 87

Calcium channel blockers may worsen the condition in clients with acute myocardial infarction or unstable angina due to their potential to exacerbate cardiac conduction anomalies or reduce left ventricular function.

Question 88

What is the mechanism of action of thrombolytic medications like alteplase in treating an MI?

Answer 88

Thrombolytic medications convert plasminogen to plasmin, an enzyme that breaks down fibrin mesh within blood clots, thereby dissolving the clots and restoring blood flow to the myocardium.

Question 89

What are the FDA-approved indications for omega-3 fatty acid supplements?

Answer 89

The FDA has approved omega-3 fatty acid supplements for adults with very high triglycerides (greater than 500 mg/dL) and for cardiovascular risk reduction in clients with a history of CHD, such as a previous MI.

Question 90

What are the contraindications for the use of ACE inhibitors in post-MI clients?

Answer 90

Contraindications for ACE inhibitors include a history of angioedema, pregnancy (due to teratogenic effects), bilateral renal artery stenosis, hyperkalemia, and renal failure associated with previous ACE inhibitor use.

Question 91

What adverse effects are highlighted by the BABE mnemonic for beta-blockers, and how do these effects impact the body?

Answer 91

The BABE mnemonic stands for Bronchospasm, AV block, Bradycardia, and Exacerbation of heart failure. Bronchospasm can cause respiratory distress, AV block can lead to irregular rhythms and decreased cardiac output, Bradycardia can result in dangerously low heart rates, and heart failure exacerbation can worsen symptoms like edema and dyspnea.

Question 92

What long-term structural changes occur in the heart after a myocardial infarction, and what are the potential risks associated with these changes?

Answer 92

After a myocardial infarction, the affected heart tissue heals through scar formation, leading to remodeling. This includes dilation and hypertrophy of the viable myocardial tissue to compensate for the loss of function. These changes can decrease overall cardiac function and increase the risk of complications such as heart failure and dysrhythmias.

Question 93

What is the mechanism by which ranolazine reduces calcium overload in ischemic cardiac cells?

Answer 93

Ranolazine inhibits the late phase of inward sodium current, which reduces calcium influx via the sodium-calcium exchanger (NXC), thereby decreasing calcium overload in cardiac cells and lowering oxygen demand.

Question 94

What is the role of nitrate-free periods in nitrate therapy?

Answer 94

Nitrate-free periods are important to prevent the development of tolerance. Continuous exposure to nitrates can reduce their effectiveness, so intermittent dosing allows restoration of sensitivity.

Question 95

What are common side effects of calcium channel blockers related to their vasodilatory action?

Answer 95

Common side effects include flushing (warmth and redness in the face, neck, and upper chest) and peripheral edema (swelling in the lower extremities due to fluid accumulation).

Question 96

Which type of angina is particularly managed effectively by calcium channel blockers?

Answer 96

Calcium channel blockers are particularly effective at managing vasospastic angina by preventing coronary artery spasms and improving coronary blood flow.