Hypertension Treatments and Lisinopril Pharmacokinetics
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Questions and Answers

Which of the following drugs is a potassium-sparing diuretic used for resistant hypertension?

  • Alpha blockers
  • Spironolactone (correct)
  • Beta blockers
  • Indapamide
  • Beta blockers are preferred for initial therapy for hypertension.

    False (B)

    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.

    <p>acute polyphyrias</p> Signup and view all the answers

    Match the following drugs with their mechanism of action in hypertension management:

    <p>Spironolactone = Blocks aldosterone-induced sodium reabsorption Alpha Blockers = Blocks arterial alpha 1 receptors Beta Blockers = Blocks NA into the heart and reduces heart rate Indapamide = Not directly mentioned in the provided text</p> Signup and view all the answers

    Which of the following is NOT a side effect of ACE inhibitors?

    <p>Hypoglycemia (C)</p> Signup and view all the answers

    ACE inhibitors are contraindicated in patients with severe hepatic impairment.

    <p>False (B)</p> Signup and view all the answers

    What is the mechanism of action of ACE inhibitors?

    <p>ACE inhibitors block the angiotensin converting enzyme in the renin-angiotensin-aldosterone system, preventing the formation of angiotensin II.</p> Signup and view all the answers

    The active metabolite of Losartan is ______ and has a longer half-life than the parent drug.

    <p>more potent</p> Signup and view all the answers

    Match the following drugs with their respective classes of hypertension medications:

    <p>Lisinopril = ACE inhibitor Losartan = Angiotensin-receptor blocker Amlodipine = Calcium channel blocker</p> Signup and view all the answers

    Which of the following is a caution associated with the use of Losartan in hypertension patients?

    <p>Left ventricular hypertrophy (B)</p> Signup and view all the answers

    Amlodipine blocks calcium channels in the heart, leading to increased myocardial contractility.

    <p>False (B)</p> Signup and view all the answers

    What is the pharmacokinetic property of Lisinopril that makes it suitable for renal excretion?

    <p>Water solubility</p> Signup and view all the answers

    Which of the following are potential side effects of amlodipine?

    <p>All of the above (D)</p> Signup and view all the answers

    The half-life of amlodipine is between ______ and ______ hours.

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    What are the primary side effects associated with all calcium channel blockers?

    <p>Dizziness, headache, nausea, palpitations, rash, and vomiting (A)</p> Signup and view all the answers

    Amlodipine's half-life is significantly affected by poor renal function.

    <p>False (B)</p> Signup and view all the answers

    What is the mechanism of action of calcium channel blockers in relation to vascular smooth muscle cells?

    <p>Calcium channel blockers cause relaxation of vascular smooth muscle cells by inhibiting the influx of calcium ions. This leads to vasodilation, reducing blood pressure.</p> Signup and view all the answers

    Indapamide, a thiazide-like diuretic, inhibits the action of the ______ in the distal convoluted tubule.

    <p>Na+/Cl- symporter</p> Signup and view all the answers

    Match the following medications with their respective classes:

    <p>Amlodipine = Calcium Channel Blocker Indapamide = Thiazide-like Diuretic</p> Signup and view all the answers

    What is a major caution associated with the use of thiazide-like diuretics?

    <p>They can cause hypokalaemia (low potassium levels) (D)</p> 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.

    <p>False (B)</p> Signup and view all the answers

    What are the contraindications for all thiazide-like diuretics?

    <p>Contraindications for all thiazide-like diuretics are Addison's disease and electrolyte imbalance.</p> Signup and view all the answers

    Flashcards

    Cautions for Spironolactone

    Spironolactone should be avoided in patients with gout, diabetes, hyperaldosteronism, severe liver disease, or low renal function.

    Spironolactone mechanism

    Spironolactone inhibits aldosterone, leading to Na+ and H2O loss while retaining K+.

    Alpha Blockers

    Alpha blockers, such as Doxazosin, lower blood pressure by blocking alpha 1 receptors, causing vasodilation.

    Beta Blockers

    Beta blockers reduce heart rate and stroke volume, affecting renin release in the RAAS.

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    Initial therapy for hypertension

    Beta blockers are not preferred for initial therapy due to contraindications with other common medications.

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    Calcium channel blockers side effects

    Common side effects include dizziness, headache, nausea, palpitations, rash, and vomiting.

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    Amlodipine side effects

    Specific side effects for amlodipine include diarrhea, constipation, headache, and dyspnea.

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    Amlodipine pharmacokinetics

    Amlodipine is given orally with 60% bioavailability and a half-life of 30-50 hours.

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    Calcium channel blockers mechanism of action

    They promote relaxation in vascular smooth muscle cells by increasing cGMP levels.

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    Thiazide-like diuretics

    Indapamide inhibits Na+/Cl- symporter in the distal convoluted tubule, affecting sodium reabsorption.

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    Thiazide-like diuretics side effects

    Common side effects include constipation, electrolyte imbalance, and headache.

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    Indapamide pharmacokinetics

    Indapamide is orally administered, acts within 1-2 hours, with a 12-24 hour duration.

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    Contraindications of thiazides

    Contraindications include Addison's disease and electrolyte imbalance.

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    ACE inhibitors

    Medications that block angiotensin converting enzyme, preventing formation of angiotensin 2.

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    Lisinopril

    An ACE inhibitor used to treat hypertension, available orally with 25% bioavailability.

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    Side effects of ACE inhibitors

    Common side effects include cough, headache, dizziness, and gastrointestinal issues.

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    Angiotensin-receptor blockers (ARBs)

    Drugs that block the effects of angiotensin 2 at the AT1 receptor to lower blood pressure.

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    Losartan

    An ARB medication effective in reducing hypertension, with 32% bioavailability when taken orally.

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    Common side effects of ARBs

    Side effects can include headache, dizziness, hypotension, and abdominal pain.

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    Calcium channel blockers

    Medications like Amlodipine that block calcium channels in the heart, reducing contractility.

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    Cautions in ACE inhibitors

    Use with caution in renal impairment and monitor renal function before starting.

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    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

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    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.

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