Question

Calcium Channel Blockers are contraindicated in

• A. Acute Left Ventricular Failure
• B. Essential Hypertension
• C. Peripheral Vascular Disease
• D. Primary Pulmonary Hypertension

Hint:

Think about what a drug that weakens heart contraction would do to an already failing heart.

Answer 1

The Correct Option is A

Step 1: Understand what calcium channel blockers do to the heart.
Calcium channel blockers, especially the non dihydropyridine group like verapamil and diltiazem, reduce the force of heart muscle contraction and slow the heart rate. This effect is useful in many settings but can be harmful when the heart is already struggling to pump.

Step 2: Apply this to acute left ventricular failure.
In acute left ventricular failure, the heart muscle is already too weak to pump enough blood forward. Giving a drug that further reduces the force of contraction can push the heart into worse failure and drop blood pressure sharply. So calcium channel blockers are contraindicated here.

Step 3: Check the other options.

(B) Essential hypertension: calcium channel blockers are a standard and widely used treatment for high blood pressure, not a contraindication.
(C) Peripheral vascular disease: dihydropyridine calcium channel blockers cause vasodilation and are often used to help with conditions like Raynaud's phenomenon, so they are not contraindicated here.
(D) Primary pulmonary hypertension: in patients who respond to vasodilator testing, calcium channel blockers such as nifedipine are actually part of standard treatment, so this is not a blanket contraindication either.

Step 4: Final conclusion.
Acute left ventricular failure is the setting where the negative effect on heart muscle contraction makes calcium channel blockers dangerous and contraindicated.