Patient on verapamil should not be given beta blocker as –
**Core Concept**
Verapamil is a calcium channel blocker that primarily affects the L-type calcium channels in the heart, leading to a decrease in cardiac contractility and heart rate. Beta blockers, on the other hand, decrease heart rate and contractility by blocking beta-1 receptors in the heart. When used together, they can lead to excessive reduction in cardiac output due to additive effects on contractility and heart rate.
**Why the Correct Answer is Right**
The combination of verapamil and beta blockers can result in severe hypotension, bradycardia, and even heart block due to the additive effects on cardiac conduction and contractility. This is because both classes of drugs decrease the force of cardiac contractions and slow the heart rate, leading to a significant reduction in cardiac output. The risk of heart block is particularly concerning, as it can lead to syncope, shock, or even cardiac arrest.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided. Please provide the complete question with all options.
**Option B:** This option is not provided. Please provide the complete question with all options.
**Option C:** This option is not provided. Please provide the complete question with all options.
**Clinical Pearl / High-Yield Fact**
When combining calcium channel blockers with beta blockers, it's essential to monitor cardiac function closely and adjust the doses carefully to avoid excessive reduction in cardiac output. The combination is generally contraindicated in patients with heart block or those at risk of developing heart block.
**Correct Answer:** D.