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BASIC - CARDIOVASCULAR + DERMATOLOGY Flashcards

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1
Q

Names of loop diuretics?

A

Furosemide, bumetanide

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2
Q

Indications of loop diuretics?

A

Acute pulmonary oedema (with O2 and nitrates)
Chronic heart failure
Other oedematous states (renal and liver disease)

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3
Q

Mechanism of action of loop diuretics?

A
  • Act on ascending limb of loop of Henle – inhibit Na/K/2Cl co-transporter (from lumen to epithelial cell)
  • Stops water following by osmosis
  • Dilatation of capacitance veins – reduces preload and improves contractile function of heart failure
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4
Q

Side effects of loop diuretics?

A
  • Dehydration
  • Hypotension
  • Low electrolytes (Na, K, Cl, Ca, Mg)
  • Tinnitus and hearing loss
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5
Q

Contraindications of loop diuretics?

A
  • Dehydration/Hypovolaemia

- Hepatic encephalopathy (hypokalaemia cause/worsen coma)

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6
Q

Cautions of loop diuretics?

A
  • Electrolyte disturbances (low K, Na)

- Worsens gout – inhibit uric acid excretion

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7
Q

Interactions of loop diuretics?

A
  • Affect drugs excreted by kidneys
    o E.g. lithium levels increase and digoxin toxicity by hypokalaemia
  • Increase ototoxicity and nephrotoxicity of aminoglycosides
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8
Q

Dose of loop diuretics?

A

o Oral/IV furosemide 40g
o Oral 1mg bumetanide (500mg if elderly)
o Oral doses taken in morning (second dose in early afternoon when BDS) to avoid nocturia

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9
Q

Communication to patient of loop diuretics?

A

o Medicine will cause urine to be passed more

o Aim for weight loss of no more than 1kg/day

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10
Q

Monitoring of loop diuretics?

A

o U&Es during treatment

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11
Q

Names of thiazide diuretics?

A

Bendroflumethiazide, indapamide, chlortalidone, metolazone

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12
Q

Indications of thiazide diuretics?

A
  • Hypertension add-on (step 3)

- Alternative first-line hypertension when CCB cannot be used (HF, oedema)

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13
Q

Mechanism of action of thiazide diuretics?

A
  • Inhibit Na/Cl co-transporter in distal convoluted tubule

- Prevents sodium and water reabsorption

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14
Q

Side Effects of thiazide diuretics?

A
  • Hyponatraemia
  • Hypokalaemia
  • Cardiac arrhythmias
  • Increase glucose, HDLs and triglycerides
  • Impotence in men
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15
Q

Contraindications of thiazide diuretics?

A
  • Hypokalaemia
  • Hyponatraemia
  • Gout
  • Hypercalcaemia
  • Addison’s Disease
  • History of allergy to sulphonamides
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16
Q

Changes in renal failure of thiazide diuretics?

A
  • Ineffective in eGFR<30

- Metolazone effective if eGFR<30

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17
Q

Changes in liver failure of thiazide diuretics?

A
  • Caution mild-to-moderate

- Avoid in severe liver disease

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18
Q

Interactions of thiazide diuretics?

A
  • NSAIDs reduce effectiveness

- Combination of loop and thiazide diuretics lower serum K

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19
Q

Dose of thiazide diuretics?

A
  • Taken orally, regularly
  • Indapamide 2.5mg OD used for hypertension
  • Take in morning
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20
Q

Monitoring of thiazide diuretics?

A

U&Es before starting, 2-4 weeks into therapy and after change in dose

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21
Q

Names of K-sparing diuretics?

A

Amiloride (as co-amilofruse/co-amilozide), spironolactone, eplerenone

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22
Q

Indications of amiloride and spironolactone?

A

Amiloride - Hypokalaemia (arising from diuretic therapy)
Spironolactone - Ascites and oedema from liver cirrhosis, CHF, Hypertension (resistant), Nephrotic syndrome
Primary hyperaldosteronism

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23
Q

Mechanism of amiloride and spironolactone?

A
  • Amiloride
    o Weak diuretic but can counter-act potassium loss
    o Inhibits Na and water reabsorption by ENaC in distal convoluted tubule
  • Spironolactone
    o Competitively bind to aldosterone receptors affecting ENaC in distal convoluted tubule
    o Increases potassium retention and increases water and Na excretion
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24
Q

Side effects of K-sparing diuretics?

A
  • GI upset
  • Dizziness, hypotension and urinary symptoms
  • Hyperkalaemia
  • Spironolactone only – gynaecomastia, jaundice, liver impairment, SJS (bullous skin eruption)
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25
Contraindications of K-sparing diuretics?
- Severe renal impairment - Hyperkalaemia - Anuria - Spironolactone – Addison’s disease - Pregnancy and breast-feeding
26
Interactions of K-sparing diuretics?
- Do not combine with potassium supplements, aldosterone antagonists, ACEi, ARBs – risk of hyperkalaemia - Dose adjustment of lithium and digoxin needed
27
Dose of K-sparing diuretics?
o Co-amilofruse tablet at strength 1:8 so state strength and dose as number of tablets taken daily o Spironolactone = 100-200mg, increased up to 400mg o Regular OD dose - take with food o Take in morning to minimise nocturia
28
Communication to patients of K-sparing diuretics?
o Warn men possibility of growth and tenderness of tissue under the nipples and impotence - spironolactone o Reversible
29
Monitoring of K-sparing diuretics?
o Serum potassium, U&Es  1 week after initiation/dose increase  Monthly for 3 months and then 3 monthly for a year  Then every 6 months
30
Names of ACE inhibitors?
Ramipril, Lisinopril, Perindopril
31
Indications of ACE inhibitors?
Hypertension (1st or 2nd line Rx) Heart Failure (1st line) Ischaemic Heart Disease CKD
32
Mechanism of ACE inhibitors?
- Block action of ACE to prevent conversion of angiotensin 1 to angiotensin 2 (Angiotensin 2 is vasoconstriction and stimulates aldosterone secretion) - Reduces peripheral vascular resistance (BP), dilates efferent glomerular arteriole (reduces intraglomerular pressure – slows CKD) - Reduces aldosterone level – promotes sodium and water excretion (beneficial in HF)
33
Side effects of ACE inhibitors?
- Dry cough (1 in 10) – due to increased bradykinin - Hypotension (especially with 1st dose – take in night) - Hyperkalaemia - Worsen renal failure - Angioedema
34
Contraindications of ACE inhibitors?
- Renal artery stenosis - AKI - Pregnant and breastfeeding women
35
Dose changes in hepatic and renal impairment of ACE inhibitors?
Hepatic Impairment - Caution Renal Impairment - Start with lower dose, adjust according to response
36
Interactions of ACE inhibitors?
- Avoid in potassium-elevating drugs (K+ supplements, potassium sparing diuretics) - NSAIDs and ACEi – increased risk of renal failure
37
Dose of ACE inhibitors? (ramipril)
- Orally - Starting dose 1.25-2.5mg ‘titrated up’ to a maximum 10 mg daily dose over a period of weeks - First dose before bed to reduce symptomatic hypotension
38
Communication to patient of ACE inhibitors?
- Treatment to improve blood pressure and reduce strain on their heart - Advise patients about common side effects - Avoid taking over-the-counter anti-inflammatories (e.g. ibuprofen) due to the risk of kidney damage.
39
Monitoring of ACE inhibitors?
o Blood test monitoring as can interfere with their kidney function and upset potassium balance o Check electrolytes and renal function before starting treatment o Repeat these 1–2 weeks into treatment and after increasing the dose If eGFR<25% increase and creatinine <30% increase - continue and recheck levels in 1-2 weeks If eGFR>25% increase or creatinine >30% increase - stop drug or reduce dose to tolerated dose If K>6 - stop ACEi
40
Names of beta-blockers?
Bisoprolol, Atenolol, Propranolol, Metoprolol
41
Indications of beta-blockers?
- 1st line in Angina, ACS - CHF - AF - SVT - Hypertension (Step 4)
42
Mechanism of beta-blockers?
- Beta1-adrenoreceptors found in heart mainly and Beta2-adrenoreceptors found in smooth muscle of airways and blood vessel - Beta-blockers non-specific o Atenolol, bisoprolol and metoprolol more B1 specific o Propranolol non-selective - Mechanism: o Reduce force of contraction and speed of conduction in the heart o Prolong refractory period in AV node o Reduce renin secretion
43
Side effects of beta-blockers?
- Fatigue, cold extremities, headache and GI upset - Sleep disturbance - Impotence in men
44
Contraindications of beta-blockers?
- Asthma (bronchospasm) - Cardiogenic shock - Hypotension - Metabolic acidosis - Prinzmetal angina - 2nd degree Heart block - Pregnancy
45
Cautions of beta-blockers?
- 1st degree heart block - Hx of obstructive airway disease - Myasthenia gravis
46
Dose changes in hepatic and renal impairment of beta-blockers??
Hepatic Impairment - Caution – maximum 10mg in severe Renal Impairment - Reduce dose (max 10mg) if eGFR<20
47
Interactions of beta-blockers?
- Do not combine Beta-blockers and Non-DHP CCB – cause HF and bradycardia
48
Dose of beta-blockers?
- Oral, start low dose - Bisoprolol in hypertension = 5-10mg - Bisoprolol in HF = 1.25mg increased by 1.25mg weekly up to 10mg - Take at same time each day OD - Aim for HR of 55-60bpm
49
Monitoring of beta-blockers?
o Lung function (in patients with Hx of obstructive airway disease)
50
Cessation of beta-blockers?
Avoid abrupt withdrawal, especially in IHD | Causes rebound worsening of myocardial ischaemia
51
Names of nitrates?
Isosorbide mononitrate | Glyceryl trinitrate
52
Indications of nitrates?
- Acute angina, ACS - Prophylaxis of angina (where BB, CCB not tolerated) - IV nitrates in pulmonary oedema (with furosemide and oxygen)
53
Mechanism of nitrates?
- Nitrates converted into NO - NO increases cGMP and reduces intracellular Ca in vascular smooth muscle cells - Relaxation of venous capacitance vessels reduces preload - Reduce cardiac work and myocardial oxygen demand - Relaxation of systemic arteries, reducing arterial resistance and afterload
54
Side effects of nitrates?
- Flushing, headaches, light-headedness, hypotension, nausea and vomiting - Sustained use – tolerance o Nitrate free period important for 4-12 hours a day
55
Contraindications of nitrates?
- Severe aortic stenosis - Cardiac Tamponade - Constrictive pericarditis - Cardiogenic shock - Hypotension
56
Cautions of nitrates?
- HF due to obstruction - Hypothermia - Hypothyroidism
57
Dose changes in hepatic and renal impairment of nitrates?
Hepatic Impairment - Caution in severe impairment Renal Impairment - Caution in severe impairment
58
Interactions of nitrates?
- Avoid phosphodiesterase inhibitors (Sildenafil) – hypotension - Caution in antihypertensives – hypotension
59
Prescription of nitrates?
o GTN taken sublingually tablets or spray for immediate relief (half-life <5 mins) o ISMN prescribed BDS/TDS for prevention of recurrent angina o Available IR, MR, patches o In ACS GTN given IVI:  Usually given 1mg/mL (50mg in 50mL), express starting dose as rate 1mL/hr  Increase GTN rate by 0.5mL/hr every 15-30 minutes until relieved
60
Communication to patients on nitrates?
o Take GTN before tasks to prevent angina o Sit down and rest before and for 5 mins after taking GTN – hypotension o GTN tablets need to be discarded after 8 weeks, so spray better for infrequent angina o Ensure nitrate free period – usually overnight to prevent tolerance
61
Monitoring of nitrates?
o IV nitrates – measure BP and HR - >90mmHg systolic
62
Cessation of nitrates?
o Avoid abrupt withdrawal
63
Names of calcium channel blockers?
Dihydropyridines - Amlodipine, Nifedipine (vascular selective) Non-dihydropyridines – Verapamil, Diltiazem (cardio-selective)
64
Indications of calcium channel blockers?
- Hypertension – Amlodipine - Stable angina – amlodipine/Nifedipine - Supraventricular arrhythmias (diltiazem and verapamil) – SVT, Atrial flutter and fibrillation
65
Mechanism of action of calcium channel blockers?
- Decrease Ca entry into vascular and cardiac cells - Causes o Relaxation and vasodilation in arterial smooth muscle (lowered blood pressure) o Reduced myocardial contractility o Reduce cardiac conduction (particularly AV node) o Reduce myocardial oxygen demand
66
Side effects of calcium channel blockers?
- DHP o Ankle swelling, flushing, headache and palpitations (caused by vasodilatation and compensatory tachycardia) o Abdominal pain, nausea, vomiting - Verapamil o Constipation, bradycardia, hypotension, heart block, cardiac failure - Diltiazem – any of the above
67
Contraindications of calcium channel blockers?
- Non-DHP – bradycardia, 2nd/3rd degree heart block, Wolf-Parkinson-White syndrome, hypotension, cardiogenic shock - DHP - unstable angina, cardiogenic shock and severe aortic stenosis
68
Dose change in hepatic impairment of calcium channel blockers?
Hepatic Impairment | - Caution – start at low dose
69
Interactions of calcium channel blockers?
- Non-DHP – do not prescribe with Beta-blockers
70
Dose of amlodipine/diltiazem?
- Oral, OD (amlodipine) - E.g. amlodipine 5-10mg OD for hypertension, diltiazem MR 90mg 12hr for angina - MR swallowed whole, not crushed or chewed
71
Names of angiotensin receptor antagonists (ARBs)?
Losartan, Candesartan, Irbesartan
72
Indications of angiotensin receptor antagonists (ARBs)?
``` - When ACEi not tolerated: o Hypertension o HF o IHD o CKD ```
73
Mechanism of angiotensin receptor antagonists (ARBs)?
- ARBs block the action of angiotensin II on the AT1 receptor - Angiotensin II is a vasoconstrictor and stimulates aldosterone secretion - Blockage - reduces peripheral vascular resistance (Low BP), dilates the efferent glomerular arteriole (reduces intraglomerular pressure and slows the progression of CKD), reducing the aldosterone level promotes sodium and water excretion - Reduce venous return (preload), which has a beneficial effect in heart failure.
74
Side effects of angiotensin receptor antagonists (ARBs)?
- Hypotension (particularly first dose) - Hyperkalaemia - Renal Failure
75
Contraindications of angiotensin receptor antagonists (ARBs)?
- Renal artery stenosis - AKI - Avoid in pregnant or breast feeding women
76
Dose changes in hepatic and renal impairment of angiotensin receptor antagonists (ARBs)?
Hepatic Impairment - Caution in mild to moderate – dose reduction - Avoid in severe Renal Impairment - Start low dose and adjust according to response
77
Interactions of angiotensin receptor antagonists (ARBs)?
- Avoid in potassium-elevating drugs (K+ supplements, potassium sparing diuretics) - NSAIDs and ACEi – increased risk of renal failure
78
Prescription of angiotensin receptor antagonists (ARBs)?
- Orally - Starting dose ‘titrated up’ to a maximum daily dose over a period of weeks - First dose before bed to reduce symptomatic hypotension
79
Monitoring of angiotensin receptor antagonists (ARBs)?
o Check U&E before starting treatment o Repeat these 1–2 weeks into treatment and after increasing the dose If eGFR<25% increase and creatinine <30% increase - continue and recheck levels in 1-2 weeks If eGFR>25% increase or creatinine >30% increase - stop drug or reduce dose to tolerated dose If K>6 - stop ACEi
80
Indications of aspirin?
- Acute in ACS/CVA ischaemic - 2o prevention in CVD, CVA, PAD - AF (when warfarin or NOAC contraindicated) - Following coronary by-pass surgery - Pain (mild-to-moderate)
81
Mechanism of aspirin?
- Antiplatelets (along with clopidogrel, ticagrelor) – work on platelets in arterial systems - Irreversibly inhibits cyclooxygenase (COX) to reduce thromboxane production from arachidonic acid – reduces platelet aggregation - Antiplatelet effect at low doses and lasts lifetime of platelet
82
Side effects of aspirin?
- GI irritation, ulceration and haemorrhage - Bronchospasm - Tinnitus
83
Overdose symptoms of aspirin?
o Hyperventilation, hearing changes, metabolic acidosis, confusion, collapse
84
Contraindications of aspirin?
- <16 years old (Reye’s syndrome) - Active peptic ulcer (and previous) - Bleeding disorders - Allergy to NSAIDs
85
Cautions of aspirin?
- Anaemia - Uncontrolled hypertension - Third trimester of pregnancy - Gout (may trigger acute attack)
86
Dose changes in hepatic and renal impairment of aspirin?
Hepatic Impairment - Avoid in severe impairment Renal Impairment - Avoid in severe
87
Interactions of aspirin?
- Synergistic increase risk of bleeding
88
Doses of aspirin?
o ACS – Once-only loading dose 300mg followed by 75mg regularly o Ischaemic CVA – 300mg for 2 weeks before switching to 75mg daily o Long-term prevention – 75mg daily - Gastroprotection in people at risk - Take after food
89
Indications of clopidogrel?
ACS Coronary artery stents 2o prevention of CVD, CVA and PAD AF (where warfarin or NOACs CI)
90
Mechanism of clopidogrel?
- Used when platelet-rich thrombus forms in atheromatous arteries - Prevents platelet aggregation by binding irreversibly to ADP receptors on platelet surface
91
Side effects of clopidogrel?
- Bleeding - GI upset – dyspepsia, abdominal pain, diarrhoea - Thrombocytopenia
92
Contraindications of clopidogrel?
- Active bleeding | - Stop 7 days before elective surgery
93
Dose changes in hepatic and renal impairment of clopidogrel?
Hepatic Impairment - Avoid in severe Renal Impairment - Caution
94
Interactions of clopidogrel?
- Pro-drug requires CYP450 enzymes hepatic to convert to active form - Efficacy affected by CYP450 inhibitors and inducers - Increased risk of bleeding – antiplatelets, anticoagulants, NSAIDs
95
Dose of clopidogrel?
- Doses require week to reach full antiplatelet effect - Loading dose – oral 300mg, maintenance dose 75mg OD - PPI used
96
Names of LMWH?
Tinzaparin, enoxaparin, dalteparin, fondaparinux
97
Indications of LMWH?
Prophylaxis of VTE (inpatients and initial treatment) Treatment of DVT/PE VTE in Pregnancy ACS
98
Mechanism of LMWH?
- Unfractioned heparin – activates antithrombin that inactivates Factor 10a and thrombin - LMWH – similar but preferentially inhibit Factor 10a - Fondaparinux – synthetic compound inhibits Factor 10a only
99
Side Effects of LMWH?
- Bleeding - Injection site reaction - Heparin-induced thrombocytopenia
100
Contraindications of LMWH?
- Acute bacterial endocarditis - Major trauma - Epidural/Spinal anaesthesia/lumbar puncture (12hs after dose) - Haemophilia - Peptic ulcer
101
Dose reduction in renal impairment of LMWH?
Dose reduction if eGFR <30 (use unfractioned heparin)
102
Interactions of LMWH?
- Combined antithrombotic drugs increase risk of bleeding | - Protamine can be given in major bleeding to reverse anticoagulation (effective for UFH mostly)
103
Prescription of LMWH?
- SC injection – dose dependent on patient weight and indication - Long-term therapy - Tinzaparin = prophylaxis 50U/kg, treatment 175U/kg
104
Monitoring of LMWH?
o Baseline FBC and U&Es o Platelet count monitored in therapy > 4 days o U&Es regularly checked if >7 days
105
Indications of warfarin?
Prophylaxis and treatment in DVT and PE | Prophylaxis in AF and heart valve replacement (lifelong after mechanical valve)
106
Mechanism of warfarin?
- Inhibits vitamin K epoxide reductase, preventing reactivation of vitamin K and coagulation factor synthesis (2, 7, 9, 10) - Vitamin K must be in reduced form for synthesis of coagulation factors, which it is then oxidised - Thins the blood
107
Side effects of warfarin?
- Bleeding (1-2%) | - Diarrhoea, nausea, rash
108
Contraindications of warfarin?
- Immediate risk of haemorrhage – stroke, bleeding - Pregnancy - <48 hours postpartum and not conceive (teratogenicity) - Women in 1st trimester
109
Caution of warfarin?
- Bacterial endocarditis - Hx of GI bleeding - Hyperthyroidism
110
Dose changes in hepatic and renal impairment of warfarin?
Hepatic Impairment - Avoid in severe Renal Impairment - Monitor INR more frequently
111
Interactions of warfarin?
- Low therapeutic index - Altered drug content by CYP450 inhibitors and inducers - Antibiotics kill gut flora which synthesis Vitamin K so increase anticoagulation
112
Dose of warfarin?
o Oral OD – usually 6pm, same time o 5-10mg on day 1 o Subsequent doses guided by INR - If immediate effect needed – started on LMWH concomitantly
113
Practicalities of warfarin?
o Patients receive anticoagulant book (yellow book) used to record doses and blood test results o Always carry anticoagulant alert card with you
114
Monitoring of warfarin?
o INR between 2-3 measured daily in hospital  Initially be frequent (every 3-4 days until two consecutive readings are within range) then twice weekly for 1-2 weeks (again until two consecutive readings within range)  Thereafter, testing can increase to longer periods (e.g. every 12 weeks)
115
Missed dose rules of warfarin?
o Never double up on doses: If a dose is accidentally missed, they should continue with the regimen as prescribed, and never take a double dose (unless specifically advised)
116
Lifestyle changes of warfarin?
o Avoid liver, spinach, cranberry juice, alcohol binges | o No NSAIDs/aspirin
117
Names of NOACs?
Apixaban, Dabigatran, Rivaroxaban
118
Indications of NOACs?
Prevention of VTE following knee/hip replacement surgery DVT/PE – treatment and prophylaxis in recurrent Prevention in AF ACS (Rivaroxaban)
119
Mechanism of NOACs?
- Direct factor 10a inhibitor
120
Side Effects of NOACs?
- Bleeding - Abdominal pain, diarrhoea, constipation - Headache
121
Contraindication of NOACs?
- Antiphospholipid syndrome | - Active bleeding
122
Cautions of NOACs?
- Prosthetic heart valve | - Recent surgery (rivaroxaban
123
Dose changes in hepatic and renal impairment of NOACs?
- Avoid in severe - Avoid eGFR <15 (apixaban & rivaroxaban) - Reduce dose to 2.5mg BD if eGFR 15-29 (apixaban & rivaroxaban)
124
Dose of NOACs?
Apixaban - Prophylaxis - 2.5mg - Treatment - 10mg Dabigatran - Prophylaxis - 75mg - Treatment - 150-110mg Rivaroxaban - Prophylaxis - 10mg - Treatment - 15mg
125
Names & Indications of statins?
Simvastatin, Atorvastatin, Pravastatin, Rosuvastatin - 10 prevention of CVD (<84 years and with QRISK2 >10%) - 20 prevention of CVD - Offer in Type 1 diabetes, CKD, Primary hyperlipidaemia – in primary/familial hypercholesterolaemia, mixed dyslipidaemia
126
Mechanism of statins?
- Reduce serum cholesterol levels - Inhibit hydroxy-3-methyl-glutaryl coenzyme A (HMG-CoA) reductase - Decrease cholesterol production by liver and increase LDL clearance from blood - Reduce triglycerides and slightly increase HDL levels
127
Side effects of statins?
- Muscle aches (myopathy/rhabdomyolysis) - Headache and GI disturbances - Rise in ALT/CK - Drug-induced hepatitis
128
Contraindications of statins?
- Porphyria | - Pregnant or breastfeeding women – adequate contraception during treatment and for 1 month afterwards
129
Caution of statins?
- Elderly - High alcohol intake - Hepatic impairment – avoid in active or persistent elevated serum transaminases - Dose reduction starting at 20mg in renal impairment (excreted)
130
Interactions of statins?
Metabolism reduced by CYP450 inhibitors – higher levels and risk of SE - May have to withhold statin for period - E.g. amiodarone, diltiazem, itraconazole, macrolides - Avoid grapefruit juice Maximum 10mg dose if using ciclosporin
131
Prescription info of statins?
- If myalgia – check CK - Oral OD - Atorvastatin - 20mg (primary prevention), 80mg (secondary prevention) - Taken in evening, after meal at same time per day - Avoid grapefruit juice (atorvastatin, simvastatin)
132
Monitoring of statins?
o Baseline – Lipids profile, CK, LFTs, U&Es, HbA1c, TFTs o CK – before treatment only measured if muscle aches – if >5x upper limit, repeat in 7 days and if >5x then do not start o 3 months - Lipids screen (aim >40% reduction in non-HDLs), LFTs at 3 months and 12 months (if serum transaminases >3x upper limit then stop), HbA1c o 12 months - LFTs o Review annually o Efficacy should be monitored in 20 prevention – specific target of total cholesterol <4mmol/L or LDL cholesterol <2mmol/L
133
Indications of digoxin?
- AF and Atrial flutter (usually after BB, CBB) – sedentary patients - HF
134
Mechanism of digoxin?
- Negatively chronotropic (reduced HR) - Positively ionotropic (increases force of contraction) - Increases vagal tone - Inhibits Na/K/ATPase pump, elevation of Na in cells causes Ca to accumulate (cannot be extruded by NaCa exchanger) in cell – increasing contraction
135
Side effects of digoxin?
- Bradycardia - GI upset - Rash - Dizziness - Blurred vision - Low therapeutic index so safety is paramount
136
Contraindications of digoxin?
- Intermittent complete heart block - 2nd degree heart block - SV arrhythmias (WPW) - Constrictive pericarditis - Hypertrophic Cardiomyopathy - Myocarditis - WPW syndrome - VT/VF
137
Dose change in renal failure of digoxin??
- Dose reduction in renal failure (eliminated by kidneys) – monitor plasma-digoxin concentration
138
Interactions of digoxin?
- Hypokalaemia o Loop and thiazide diuretics increase risk of toxicity - Increase plasma concentration of digoxin o Amiodarone, CCB, spironolactone, quinine – reduce dose by half
139
Prescription of digoxin?
- Oral administration common – effect seen after 2 hours - Loading dose needed if rapid effect - IV given slowly
140
Monitoring of digoxin?
``` o Plasma digoxin concentration 6 hours after dose if toxicity suspected o ECG (ST segment depression – reverse tick - normal) o Electrolytes and U&Es ```
141
Indications of amiodarone?
- Tachyarrhythmias (AF, AF, SVT, VT, VF) – when electrical CV not used - CPR algorithm
142
Mechanism of amiodarone?
- Blockage of Na, Ca and K channels - Antagonises of alpha and beta-adrenergic receptors - Effects o Reduce spontaneous depolarisation, conduction velocity o Increases refractoriness, including AV node
143
Side effects of amiodarone?
- Hypotension if IV - Pneumonitis - Bradycardia, AV block - Hepatitis - Photosensitivity and grey discolouration - Thyroid problems
144
Contraindications of amiodarone?
- Severe conduction disturbances - Iodine sensitivity - Heart block - Active thyroid disease
145
Interactions of amiodarone?
- Lots of interactions - Increases plasma concentration of digoxin, diltiazem and verapamil – risk of bradycardia and AV block - Long half-life – takes weeks to be eliminated
146
Prescription of amiodarone?
o Senior involvement needed o Usually needs loading dose and then maintenance dose so CHECK o In cardiac arrest, given after third shock in ALS (300mg IV, followed by 20mL of 0.9% NaCl as a flush) o If continuous IV needed – central line (can cause phlebitis)
147
Communication of amiodarone?
o Advise the patient not to drink grapefruit juice, as this can increase the risk of side effects o Avoid exposure of their skin to direct sunlight due to the risk of photosensitivity
148
Monitoring of amiodarone?
o LFTs, TFTs done before and every 6 months o U&Es done before treatment o CXR o IV – continuous ECG monitoring
149
Definition of creams?
 Emulsions of oil and water and well absorbed into skin  May also contain an antimicrobial preservative  Less greasy and easier to apply than ointments
150
Definition of gels?
 Active ingredients in suitable hydrophilic or hydrophobic bases  High water content  Face and scalp suitable
151
Definition of lotions?
 Cooling effect and preferred over hairy areas |  Can sting broken skin
152
Definition of ointment?
 Greasy preparations, more occlusive than creams  Suitable for dry, chronic lesions  Commonly used is soft paraffin or combination with hard paraffin
153
Definition of pastes?
 Stiff preparations containing high proportion of finely powdered solids such as zinc oxide
154
Quantity to prescribe for face? Usually for an adult for BDS application for 1 week
* Creams and ointments – 15-30g | * Lotions – 100ml
155
Quantity to prescribe for both hands? Usually for an adult for BDS application for 1 week
* Creams and ointments – 25-50g | * Lotions – 200ml
156
Quantity to prescribe for scalp? Usually for an adult for BDS application for 1 week
* Cream and ointments – 50-100g | * Lotions – 200ml
157
Quantity to prescribe for both arms or legs? Usually for an adult for BDS application for 1 week
* Creams and ointments – 100-200g | * Lotions 200ml
158
Quantity to prescribe for trunk? Usually for an adult for BDS application for 1 week
* Creams and ointments – 400g | * Lotions – 500ml
159
Quantity to prescribe for groin/genitalia? Usually for an adult for BDS application for 1 week
* Creams and ointments – 15-25g | * Lotions – 100ml
160
Names of emollients?
Aqueous cream, liquid paraffin | Examples - E45, Aveeno (colloidal oatmeal)
161
Indications of emollients?
- Topical treatment for all dry or scaling skin disorders | - Used alone or in combination with topical corticosteroids in the treatment of eczema
162
Mechanism of emollients?
- Emollients replace water content in dry skin - Contain oils or paraffin-based products that soften skin and reduce water loss by protecting against evaporation - Many preparations used as soap substitute (as soap is drying to the skin) and also bath or shower emollients
163
Side effects of emollients?
- Greasy on skin but this is part of therapeutic effect | - Exacerbate acne and folliculitis by blocking pores and hair follicles
164
Interactions of emollients?
- Space out topical emollients – usually apply emollient 15 minutes before application of steroid cream
165
Contraindications of emollients?
- Fire hazard when oil content high
166
Properties of emollients?
``` o Emulsions of oil and water to make creams, lotions and ointments o Lotions (less oil, more water) and creams (50% oil and water) spread further o Ointments (80% oil, 20% water) are more occlusive and potent ```
167
Directions of emollients?
o Applied BDS/TDS in active disease o Give sufficient supply for frequent use – 500g o Continue after improvement to prevent recurrence o Apply emollients in the direction of hair growth o If using other topical agents, apply 15 minutes after emollient
168
Names of oral antihistamines?
Chlorphenamine (Piriton), Cetirizine, loratadine, fexofenadine
169
Indications of oral antihistamines?
- Symptomatic relief of allergy (hay fever, pruritus, urticaria, food allergy, drug reactions, itch) - Anaphylaxis emergency treatment - Relief of itch in chickenpox
170
Mechanism of oral antihistamines?
- Antagonism of H1 receptor, blocking effects of excess histamine - Histamine is released by mast cells as a result of IgE binding o Induces: wheals, flares, itch o In hay fever – nasal irritation, sneezing, rhinorrhoea, congestion, itch o Widespread histamine release – vasodilatation, vascular leakage and hypotension
171
Side effects of oral antihistamines?
- 1st gen (chlorphenamine) – sedation - 2nd gen (loratadine, cetirizine, fexofenadine) – do not cross blood brain barrier - General SE o Concentration impaired, dry mouth, fatigue, vision blurred
172
Dose reduction of oral antihistamines?
o Avoid cetirizine if eGFR <10 | o Half dose in eGFR 30-50
173
Prescription of oral antihistamines?
o Cetirizine – 10mg tablets OD o Loratadine – 10mg tablets OD o Chlorphenamine – 4mg tablets and 2mg/5ml solution every 4-6 hours o In anaphylaxis – chlorphenamine IV/IM 10mg o Fexofenadine – 120mg OD
174
Patient information for oral antihistamines?
o Chlorphenamine may make you sleepy and avoid with alcohol which can increase sedation
175
Names of topical glucocorticoids?
Mild – Hydrocortisone 0.5-2.5% Moderate – Eumovate (Clobetasone butyrate 0.05%) Potent – Betnovate (betamethasone valerate 0.1%) Very Potent – Dermovate (Clobetasol propionate 0.05%)
176
Indications of topical glucocorticoids?
- Inflammatory skin conditions, e.g. eczema, psoriasis where emollients are ineffective
177
Mechanism of topical glucocorticoids?
- Upregulate anti-inflammatory genes and downregulate pro-inflammatory genes (e.g. cytokines, tumour necrosis factor alpha) - Suppression of circulating monocytes and eosinophils - Increased gluconeogenesis from increased circulating amino and fatty acids, released by catabolism of muscle and fat - Mineralocorticoid effects, stimulating Na+ and water retention and K+ excretion in the renal tubule - Because topical, effects limited to site – need prolonged use of potent topical steroids for systemic effects
178
Side effects of topical glucocorticoids?
- Skin thinning - Telangiectasia - Skin depigmentation - Contact dermatitis - When used on face: o Perioral dermatitis o Exacerbate acne
179
Contraindications of topical glucocorticoids?
``` - Contra-indications o Infection present o Perioral dermatitis - Avoid potent on face and course should be short - Keep away from eyes ```
180
Prescription of topical glucocorticoids?
- Use as mild as possible for as short a time - < 2 weeks (1 week for facial lesions) - Prescription o Name, strength, formulation, amount
181
Application of topical glucocorticoids?
o One fingertip unit can be spread across two adult palms o BDS applied thinly on affected area o Wash hands after application o 5 minutes between different preparations applied to same skin
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