Chapter 7 Pharm
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Questions and Answers

Which of the following is NOT a side effect of β-blocker therapy?

  • Peripheral vasoconstriction
  • Increased peripheral vascular resistance (correct)
  • Altered serum lipid levels
  • Increased blood glucose levels
  • Which β-blocker is specifically mentioned for its beneficial effects in reducing lipid peroxidation and vascular wall thickening?

  • Atenolol
  • Carvedilol (correct)
  • Propranolol
  • Metoprolol
  • For which condition is intravenous labetalol specifically used due to its ability to rapidly lower blood pressure?

  • Hypertensive emergencies (correct)
  • Migraine
  • Glaucoma
  • Heart failure
  • Which β-blocker provides a prophylactic effect in the treatment of migraines?

    <p>Propranolol</p> Signup and view all the answers

    What is the main purpose of carvedilol in patients with chronic heart failure?

    <p>To prevent cardiovascular mortalities</p> Signup and view all the answers

    Which adverse effects are associated with α1 blockade?

    <p>Orthostatic hypotension and dizziness</p> Signup and view all the answers

    Which agent is known for reducing cardiac rate and potential for arrhythmias after myocardial infarction?

    <p>Propranolol</p> Signup and view all the answers

    What is the purpose of reserpine, as mentioned in the text?

    <p>Interference with neurotransmitter release</p> Signup and view all the answers

    Which of the following statements accurately describes the effect of β blockers on sexual function in males?

    <p>β blockers do not affect normal ejaculation due to their effect on α-adrenergic activation</p> Signup and view all the answers

    What metabolic disturbances can occur due to β blockade?

    <p>Prevention of counterregulatory effects of catecholamines during hypoglycemia</p> Signup and view all the answers

    Which lipid profile changes are associated with the use of nonselective β blockers?

    <p>Increased low-density lipoprotein and decreased high-density lipoprotein</p> Signup and view all the answers

    Why are cardioselective β blockers preferred in treating asthma patients who use insulin?

    <p>They have less effect on bronchial smooth muscle and glycogenolysis</p> Signup and view all the answers

    True or False: There are clinically useful β2 antagonists available for use.

    <p>False</p> Signup and view all the answers

    True or False: β blockers induce postural hypotension due to the blockade of α adrenoceptors.

    <p>False</p> Signup and view all the answers

    True or False: Propranolol primarily blocks β1 receptors and has no effect on β2 receptors.

    <p>False</p> Signup and view all the answers

    Nebivolol has no vasodilator properties mediated by nitric oxide.

    <p>False</p> Signup and view all the answers

    Coldness of extremities is less frequent in patients treated with cardioselective β blockers.

    <p>True</p> Signup and view all the answers

    Pindolol and acebutolol are pure antagonists with no intrinsic sympathomimetic activity (ISA).

    <p>False</p> Signup and view all the answers

    Blocking β2 receptors leads to vasodilation.

    <p>False</p> Signup and view all the answers

    Propranolol, when given at therapeutic doses, has a significant membrane-stabilizing effect on the heart.

    <p>False</p> Signup and view all the answers

    Patients with hypertension may experience a gradual reduction in both systolic and diastolic blood pressures with long-term use of propranolol.

    <p>True</p> Signup and view all the answers

    β blockers generally have a significant effect against ventricular arrhythmias, especially those induced by exercise.

    <p>False</p> Signup and view all the answers

    What is the primary effect of drugs that block α adrenoceptors?

    <p>Decreased peripheral vascular resistance</p> Signup and view all the answers

    How do adrenergic antagonists, which are α-adrenergic blocking agents, affect blood pressure?

    <p>They lower peripheral vascular resistance</p> Signup and view all the answers

    What is the consequence of α adrenoceptor blockade on the sympathetic tone of the blood vessels?

    <p>Decreased sympathetic tone of the blood vessels</p> Signup and view all the answers

    What is the mechanism of action of phenoxybenzamine?

    <p>Linking covalently to both α1- and α2-receptors</p> Signup and view all the answers

    How long do the effects of phenoxybenzamine last after a single administration?

    <p>24 hours</p> Signup and view all the answers

    What is the limited clinical application of phentolamine and phenoxybenzamine attributed to?

    <p>Irreversible block and noncompetitive nature</p> Signup and view all the answers

    What is the main reason phenoxybenzamine has been unsuccessful in maintaining lowered blood pressure in hypertension?

    <p>It blocks presynaptic inhibitory α2 receptors in the heart, contributing to increased cardiac output.</p> Signup and view all the answers

    How do α-adrenergic blockers affect the vasoconstrictive action of epinephrine?

    <p>They reverse the vasoconstrictive action of epinephrine.</p> Signup and view all the answers

    What effect do α-adrenergic blockers have on the actions of isoproterenol?

    <p>They have no effect on the actions of isoproterenol.</p> Signup and view all the answers

    Why has phenoxybenzamine been discontinued for maintaining lowered blood pressure in hypertension?

    <p>It blocks presynaptic inhibitory α2 receptors in the heart, contributing to increased cardiac output.</p> Signup and view all the answers

    What effect do β blockers have on serum lipid and blood glucose levels?

    <p>They do not alter serum lipid or blood glucose levels</p> Signup and view all the answers

    Which β blocker is specifically mentioned for its effects on reducing lipid peroxidation and vascular wall thickening?

    <p>Carvedilol</p> Signup and view all the answers

    For which condition is intravenous labetalol specifically used due to its ability to rapidly lower blood pressure?

    <p>Hypertensive emergencies</p> Signup and view all the answers

    What is the potential cause of impaired sexual activity in some men who are on β-blocker therapy?

    <p>Blockade of α-adrenergic activation</p> Signup and view all the answers

    What are the metabolic disturbances that can occur due to β-blockade according to the text?

    <p>Prevention of counterregulatory effects of catecholamines during hypoglycemia</p> Signup and view all the answers

    How do patients administered nonselective β-blockers typically experience changes in their serum lipid profile?

    <p>Increased LDL and triglycerides, and reduced HDL cholesterol</p> Signup and view all the answers

    What is the primary difference between nonselective and cardioselective β blockers?

    <p>Nonselective β blockers block both β1 and β2 receptors, while cardioselective β blockers primarily block β1 receptors</p> Signup and view all the answers

    In what way do α adrenoceptors contribute to the maintenance of normal sympathetic control of the vasculature?

    <p>By maintaining the responsiveness of the vasculature to sympathetic signals</p> Signup and view all the answers

    What is a notable effect of propranolol on cardiovascular function?

    <p>Diminishes cardiac output with negative inotropic and chronotropic effects</p> Signup and view all the answers

    What is the significance of the names of all β blockers ending in “-olol”?

    <p>It indicates their specific mechanism of action on adrenergic receptors</p> Signup and view all the answers

    What is the mechanism of action of phenoxybenzamine?

    <p>It irreversibly blocks both α1- and α2-receptors</p> Signup and view all the answers

    What is the primary reason for the limited clinical applications of phenoxybenzamine and phentolamine?

    <p>They have limited selectivity for α-adrenoceptors</p> Signup and view all the answers

    How long do the effects of phenoxybenzamine last after a single administration?

    <p>24 hours</p> Signup and view all the answers

    What is the consequence of α adrenoceptor blockade on the sympathetic tone of the blood vessels?

    <p>Decreased sympathetic tone</p> Signup and view all the answers

    How do the effects of phenoxybenzamine and phentolamine compare in terms of duration of action?

    <p>Phenoxybenzamine has a longer duration of action than phentolamine</p> Signup and view all the answers

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