Podcast
Questions and Answers
Which of the following drugs is a potassium-sparing diuretic used for resistant hypertension?
Which of the following drugs is a potassium-sparing diuretic used for resistant hypertension?
Beta blockers are preferred for initial therapy for hypertension.
Beta blockers are preferred for initial therapy for hypertension.
False (B)
What is the main mechanism of action of alpha blockers for hypertension treatment?
What is the main mechanism of action of alpha blockers for hypertension treatment?
Alpha blockers block arterial alpha 1 receptors, leading to decreased peripheral resistance and lower blood pressure.
Indapamide can cause ______ in some patients.
Indapamide can cause ______ in some patients.
Signup and view all the answers
Match the following drugs with their mechanism of action in hypertension management:
Match the following drugs with their mechanism of action in hypertension management:
Signup and view all the answers
Which of the following is NOT a side effect of ACE inhibitors?
Which of the following is NOT a side effect of ACE inhibitors?
Signup and view all the answers
ACE inhibitors are contraindicated in patients with severe hepatic impairment.
ACE inhibitors are contraindicated in patients with severe hepatic impairment.
Signup and view all the answers
What is the mechanism of action of ACE inhibitors?
What is the mechanism of action of ACE inhibitors?
Signup and view all the answers
The active metabolite of Losartan is ______ and has a longer half-life than the parent drug.
The active metabolite of Losartan is ______ and has a longer half-life than the parent drug.
Signup and view all the answers
Match the following drugs with their respective classes of hypertension medications:
Match the following drugs with their respective classes of hypertension medications:
Signup and view all the answers
Which of the following is a caution associated with the use of Losartan in hypertension patients?
Which of the following is a caution associated with the use of Losartan in hypertension patients?
Signup and view all the answers
Amlodipine blocks calcium channels in the heart, leading to increased myocardial contractility.
Amlodipine blocks calcium channels in the heart, leading to increased myocardial contractility.
Signup and view all the answers
What is the pharmacokinetic property of Lisinopril that makes it suitable for renal excretion?
What is the pharmacokinetic property of Lisinopril that makes it suitable for renal excretion?
Signup and view all the answers
Which of the following are potential side effects of amlodipine?
Which of the following are potential side effects of amlodipine?
Signup and view all the answers
The half-life of amlodipine is between ______ and ______ hours.
The half-life of amlodipine is between ______ and ______ hours.
Signup and view all the answers
What are the primary side effects associated with all calcium channel blockers?
What are the primary side effects associated with all calcium channel blockers?
Signup and view all the answers
Amlodipine's half-life is significantly affected by poor renal function.
Amlodipine's half-life is significantly affected by poor renal function.
Signup and view all the answers
What is the mechanism of action of calcium channel blockers in relation to vascular smooth muscle cells?
What is the mechanism of action of calcium channel blockers in relation to vascular smooth muscle cells?
Signup and view all the answers
Indapamide, a thiazide-like diuretic, inhibits the action of the ______ in the distal convoluted tubule.
Indapamide, a thiazide-like diuretic, inhibits the action of the ______ in the distal convoluted tubule.
Signup and view all the answers
Match the following medications with their respective classes:
Match the following medications with their respective classes:
Signup and view all the answers
What is a major caution associated with the use of thiazide-like diuretics?
What is a major caution associated with the use of thiazide-like diuretics?
Signup and view all the answers
High doses of thiazide diuretics have been shown to not significantly alter levels of sodium, potassium, uric acid, glucose, and lipids.
High doses of thiazide diuretics have been shown to not significantly alter levels of sodium, potassium, uric acid, glucose, and lipids.
Signup and view all the answers
What are the contraindications for all thiazide-like diuretics?
What are the contraindications for all thiazide-like diuretics?
Signup and view all the answers
Flashcards
Cautions for Spironolactone
Cautions for Spironolactone
Spironolactone should be avoided in patients with gout, diabetes, hyperaldosteronism, severe liver disease, or low renal function.
Spironolactone mechanism
Spironolactone mechanism
Spironolactone inhibits aldosterone, leading to Na+ and H2O loss while retaining K+.
Alpha Blockers
Alpha Blockers
Alpha blockers, such as Doxazosin, lower blood pressure by blocking alpha 1 receptors, causing vasodilation.
Beta Blockers
Beta Blockers
Signup and view all the flashcards
Initial therapy for hypertension
Initial therapy for hypertension
Signup and view all the flashcards
Calcium channel blockers side effects
Calcium channel blockers side effects
Signup and view all the flashcards
Amlodipine side effects
Amlodipine side effects
Signup and view all the flashcards
Amlodipine pharmacokinetics
Amlodipine pharmacokinetics
Signup and view all the flashcards
Calcium channel blockers mechanism of action
Calcium channel blockers mechanism of action
Signup and view all the flashcards
Thiazide-like diuretics
Thiazide-like diuretics
Signup and view all the flashcards
Thiazide-like diuretics side effects
Thiazide-like diuretics side effects
Signup and view all the flashcards
Indapamide pharmacokinetics
Indapamide pharmacokinetics
Signup and view all the flashcards
Contraindications of thiazides
Contraindications of thiazides
Signup and view all the flashcards
ACE inhibitors
ACE inhibitors
Signup and view all the flashcards
Lisinopril
Lisinopril
Signup and view all the flashcards
Side effects of ACE inhibitors
Side effects of ACE inhibitors
Signup and view all the flashcards
Angiotensin-receptor blockers (ARBs)
Angiotensin-receptor blockers (ARBs)
Signup and view all the flashcards
Losartan
Losartan
Signup and view all the flashcards
Common side effects of ARBs
Common side effects of ARBs
Signup and view all the flashcards
Calcium channel blockers
Calcium channel blockers
Signup and view all the flashcards
Cautions in ACE inhibitors
Cautions in ACE inhibitors
Signup and view all the flashcards
Study Notes
Hypertension Treatments
- ACE Inhibitors (e.g., Lisinopril, Catopril):
- Mechanism: Blocks angiotensin-converting enzyme in the renin-angiotensin-aldosterone system, preventing angiotensin 2 formation.
- Side effects: Cough, diarrhea, electrolyte imbalance, gastrointestinal discomfort, headache, dizziness, and postural disorders. Angina, angioedema, and alopecia (more common in African-Caribbean patients) are also potential side effects.
- Precautions: Renal function needs to be checked prior to initiating treatment. Cautions exist regarding effectiveness in African-Caribbean patients, diabetes, and atherosclerosis. Combining ACE inhibitors with renin inhibitors is contraindicated. Cholestatic jaundice, hepatitis, hepatic necrosis, and hepatic failure have been reported in some cases. Use with caution in patients with renal impairment, starting at low doses and adjusting according to response.
Lisinopril Pharmacokinetics
- Administration: Oral
- Bioavailability: 25%
- Peak Plasma Concentration: Lasts approximately 4-6 hours
- Half-life: 12 hours
- Metabolism: Water-soluble, not metabolized in the liver
- Excretion: Renal excretion unchanged
- Mechanism of action (additional): Inhibits Kininase 2, blocking the inactivation of bradykinin, which helps lower blood pressure.
Angiotensin Receptor Blockers (ARBs) (e.g., Losartan)
- Mechanism of Action: Selective competitive blockers of angiotensin 2 at the AT1 receptor
- Pharmacokinetics:
- Bioavailability: 32% orally, with 14% converting to an active metabolite.
- Half-life: 2-9 hours (for the active metabolite)
- Excretion: Urine and bile
- Side effects: Abdominal pain, headache, dizziness, diarrhea, nausea, postural hypotension, and renal impairment. Specific side effects with Losartan include anemia, hypoglycemia, and postural disorders.
- Precautions and Contraindications:
- Cautions in African-Caribbean patients, those with left ventricular hypertrophy, and elderly patients, particularly regarding severe cardiac failure, pregnancy, and severe hepatic impairment.
- Contraindicated when combined with a renin inhibitor, with patients who have reduced eGFR, or those with diabetes mellitus.
Calcium Channel Blockers (e.g., Amlodipine)
- Mechanism of Action: Blocks calcium channels in the heart and myocardium, reducing contractility.
- Side effects: Dizziness, headache, nausea, palpitations, rash, vomiting, diarrhea, constipation, headache, dizziness, gastrointestinal disorders, and vision disorders including dyspnea.
- Precautions and Contraindications: Cardiogenic shock, significant aortic valve disease, unstable angina (chest pain), hepatic and renal impairment. Dosage may need reducing if half-life is prolonged.
- Pharmacokinetics:
- Administration: Oral
- Bioavailability: ~60%
- Half-life: 30-50 hours
- Metabolism: Liver (CYP450) and renal elimination
- Renal impact: Poor renal function does not significantly reduce renal elimination.
Calcium Channel Blocker Mechanism of Action (Detailed)
- Mechanism: Causes vascular smooth muscle relaxation. Nitric oxide (NO) is broken down by guanylyl cyclase, producing cGMP, which activates myosin light chain phosphatase. This converts myosin light chain (MLC) to the unphosphorylated state, causing relaxation.
Thiazide-Like Diuretics (e.g., Indapamide):
- Mechanism of Action: Inhibits the Na+/Cl- symporter in the distal convoluted tubule, reducing sodium reabsorption.
- Side effects: Constipation, electrolyte imbalance, headache, postural disorders; a caution exists concerning hypokalaemia in cardiovascular conditions, and in those taking cardiac glycosides. Additional concerns are hypersensitivity and skin reactions, especially in the elderly.
- Precautions: Hypokalaemia is a concern, especially in patients with severe cardiovascular disease and those using cardiac glycosides.
Indapamide Pharmacokinetics:
- Administration: Oral
- Duration of Action: 12-24 hours (acting more quickly the earlier in the day that it is administered)
- Bioavailability: ~75%
- Other Considerations: High doses show more changes in Na+, K+, uric acid, glucose, and lipids compared to low-dose treatment; dosing should be carefully considered in patients with gout, diabetes, hyperaldosteronism, malnourishment, nephrotic syndrome, or a history of sulphonamide hypersensitivity. It is less effective with low renal function and can cause acute polyuria.
Resistant Hypertension Treatments:
- Drugs: Spironolactone, Alpha Blockers, Beta Blockers
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz explores various treatments for hypertension, focusing on ACE inhibitors like Lisinopril. It covers the mechanism of action, side effects, precautions, and pharmacokinetics of these medications. Test your understanding of these critical aspects of hypertension management.