Cardiovascular Drugs MCQs — Questions 761–764 (Page 77 of 77)

Q: Which of the following drugs is primarily indicated for improving symptoms in congestive heart failure?

Diuretics. ***Diuretics*** - **Diuretics** are the PRIMARY agents for **symptom relief** in congestive heart failure. - They directly target fluid overload, providing immediate relief of symptoms like **dyspnea** and **edema**. - According to ACC/AHA guidelines, diuretics are recommended for **all CHF patients with fluid retention** for symptom management. - While they improve quality of life significantly, their main role is **symptom control** rather than mortality reduction. *ACE inhibitor* - **ACE inhibitors** are foundational in heart failure treatment, primarily improving **mortality** and preventing **cardiac remodeling**. - They reduce preload and afterload by inhibiting the **renin-angiotensin-aldosterone system**. - While they do improve symptoms secondarily through hemodynamic effects, their **primary indication** is mortality benefit and disease modification, not direct symptomatic relief. *Beta blockers* - While essential for **reducing mortality** and improving left ventricular function in heart failure, beta-blockers' primary aim is not direct symptomatic relief. - They can initially worsen symptoms in some patients due to a **negative inotropic effect**, although this usually improves over time. - Their main benefit is long-term mortality reduction and prevention of disease progression. *Aldosterone antagonist* - **Aldosterone antagonists** (e.g., spironolactone, eplerenone) are added to therapy to reduce **mortality** and hospitalizations in patients with reduced ejection fraction. - While they can help with fluid balance, their primary benefit is blocking the harmful effects of **aldosterone** on the heart and kidneys, not direct symptom improvement.

Q: SLE-like reactions are caused by?

Hydralazine. ***Hydralazine*** - **Hydralazine**, an antihypertensive, is a well-known cause of **drug-induced lupus erythematosus (DILE)**, characterized by symptoms mimicking systemic lupus erythematosus (SLE) [1]. - DILE often presents with **arthralgia, myalgia, fever, serositis**, and the presence of **anti-histone antibodies** [1]. - **Hydralazine** is the **second most common cause of DILE** (after procainamide), with higher risk in slow acetylators. - Other drugs causing DILE include procainamide, isoniazid, quinidine, minocycline, and phenytoin [1]. *Rifampicin* - **Rifampicin** is an antibiotic primarily used for tuberculosis and is known for causing **hepatotoxicity**, **red-orange discoloration of body fluids**, and **gastrointestinal disturbances**. - It does not typically induce an SLE-like reaction. *Furosemide* - **Furosemide** is a **loop diuretic** used to treat edema and hypertension, primarily causing **electrolyte imbalances** (e.g., hypokalemia, hyponatremia) and **ototoxicity** at high doses [2]. - It is not associated with drug-induced lupus erythematosus. *Paracetamol* - **Paracetamol (acetaminophen)** is an analgesic and antipyretic, and its main adverse effect is **hepatotoxicity** when taken in overdose [3]. - It is not known to cause SLE-like reactions.

Q: Which beta-blocker is known to cause decreased libido and impotence?

Atenolol. ***Atenolol*** - **All beta-blockers can cause sexual dysfunction** including decreased libido and impotence, primarily through **peripheral mechanisms** (reduced cardiac output, decreased peripheral blood flow) and effects on the autonomic nervous system. - **Atenolol** is a **hydrophilic (water-soluble)** beta-1 selective blocker with **poor CNS penetration**, so its effects on sexual function are mainly through peripheral mechanisms rather than central effects. - While sexual dysfunction is a recognized class effect of beta-blockers (occurring in 10-15% of patients), there is **no strong evidence that Atenolol causes this side effect significantly more than other beta-blockers**. - The question may be testing awareness that sexual dysfunction is a known side effect of beta-blocker therapy in general. *Propranolol* - **Propranolol** is a **lipophilic (fat-soluble)** non-selective beta-blocker that **readily crosses the blood-brain barrier**. - Due to its CNS penetration, it can cause sexual dysfunction through both **central and peripheral mechanisms**. - Sexual dysfunction with Propranolol is well-documented and occurs at similar rates to other beta-blockers. *Metoprolol* - **Metoprolol** is a **moderately lipophilic** beta-1 selective blocker with moderate CNS penetration. - Sexual dysfunction is a recognized side effect, occurring at rates similar to other beta-blockers in the class. - Effects are dose-dependent and may vary between immediate and extended-release formulations. *Carvedilol* - **Carvedilol** is a non-selective beta-blocker with additional **alpha-1 blocking activity** that causes vasodilation. - Sexual dysfunction can occur, though the alpha-1 blockade may theoretically provide some peripheral vascular benefit. - Like all beta-blockers, it carries the class warning for sexual dysfunction.

Q: Which of the following medications is primarily used to decrease preload?

Nitroglycerine. ***Nitroglycerine*** - **Nitroglycerine** primarily causes **venodilation**, leading to pooling of blood in the peripheral veins and a reduction in venous return to the heart. - This decrease in venous return directly lowers the **preload** on the heart, reducing ventricular end-diastolic volume and pressure. *Hydralazine* - **Hydralazine** is an **arteriolar vasodilator** that primarily acts to decrease **afterload** by relaxing arterial smooth muscle. - While it can indirectly affect cardiac output, its main effect is not on preload. *Nifedipine* - **Nifedipine** is a **calcium channel blocker** that mainly causes **arterial vasodilation**, leading to a reduction in systemic vascular resistance and **afterload**. - It has minimal direct effects on venodilation or preload. *Losartan* - **Losartan** is an **angiotensin receptor blocker (ARB)** that primarily acts by blocking the effects of angiotensin II. - This leads to **vasodilation** (both arterial and venous, though more arterial) and a decrease in blood pressure, impacting both preload and afterload but not primarily focused on preload reduction like nitroglycerine.

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Antihypertensive Agents

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Drugs for Heart Failure

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Antiarrhythmic Drugs

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Antianginal Agents

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Lipid-Lowering Drugs

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Anticoagulants and Antiplatelet Drugs

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Thrombolytic Agents

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Drugs Used in Pulmonary Hypertension

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Drugs Used in Shock

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Cardiovascular Effects of Non-Cardiovascular Drugs

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Cardiovascular Drugs — MCQs

Cardiovascular Drugs — MCQs

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