All of the following drugs can be used in hypeensive emergency –
**Core Concept**
In a hypertensive emergency, immediate reduction of blood pressure is crucial to prevent target organ damage. The goal is to lower blood pressure by 10-20% within the first hour and by 25% within the first 2 hours. Various antihypertensive medications can be used, but the choice depends on the underlying cause, severity, and comorbidities.
**Why the Correct Answer is Right**
Labetalol, a mixed alpha- and beta-blocker, is commonly used in hypertensive emergencies due to its ability to lower blood pressure quickly and safely. It can be administered intravenously, allowing for rapid titration of dose. Labetalol also has a balanced effect on both alpha- and beta-adrenergic receptors, which helps to reduce peripheral resistance and myocardial oxygen demand.
**Why Each Wrong Option is Incorrect**
**Option A:** Nitrates are primarily used for acute coronary syndrome and heart failure, as they have a vasodilatory effect on the venous system. While they can lower blood pressure, they are not the first line of treatment in hypertensive emergencies.
**Option B:** Diuretics are often used in the management of hypertension but are not typically used in hypertensive emergencies, as they can lead to dehydration and electrolyte imbalances.
**Option C:** Calcium channel blockers can be used in hypertensive emergencies but are not as commonly used as beta-blockers or vasodilators like nitroprusside.
**Clinical Pearl / High-Yield Fact**
Remember, the key to managing hypertensive emergencies is to use antihypertensive medications that can be titrated quickly and safely, such as beta-blockers like labetalol or vasodilators like nitroprusside.
**Correct Answer:** C.