All of the following drugs can be used in hypertensive emergency -a) Trimethaphan b) I.V. hydralazinec) Indapamided) Sublingual nifedipine
**Core Concept**
Hypertensive emergencies are medical conditions characterized by severely elevated blood pressure, which can lead to target organ damage if not promptly treated. In such scenarios, immediate reduction in blood pressure is necessary to prevent or limit organ damage.
**Why the Correct Answer is Right**
Intravenous hydralazine is a vasodilator that acts directly on the arterial smooth muscle to cause a decrease in peripheral resistance and a subsequent reduction in blood pressure. Its rapid onset of action makes it an ideal choice for hypertensive emergencies. Additionally, trimethaphan is a ganglionic blocker that can also be used in hypertensive emergencies due to its ability to reduce sympathetic tone and lower blood pressure. Indapamide is a thiazide-like diuretic that can be used in the management of hypertension, but it is not typically used in hypertensive emergencies due to its slower onset of action. Sublingual nifedipine can cause a rapid reduction in blood pressure, but its use is generally discouraged in hypertensive emergencies due to the risk of excessive and unpredictable blood pressure drops.
**Why Each Wrong Option is Incorrect**
**Option A:** Trimethaphan is a ganglionic blocker that can be used in hypertensive emergencies, making it a correct answer. The incorrect statement here is not applicable, as trimethaphan is indeed used in hypertensive emergencies.
**Option B:** Indapamide is a thiazide-like diuretic that is used in the management of hypertension, but it is not typically used in hypertensive emergencies due to its slower onset of action.
**Option C:** Sublingual nifedipine can cause a rapid reduction in blood pressure, but its use is generally discouraged in hypertensive emergencies due to the risk of excessive and unpredictable blood pressure drops.
**Clinical Pearl / High-Yield Fact**
In hypertensive emergencies, it is essential to rapidly lower blood pressure to prevent or limit target organ damage. The choice of antihypertensive agent should be based on the underlying cause of the hypertension and the patient's clinical presentation.
**Correct Answer: B. Indapamide**