Clevidipine is?
**Core Concept**
Clevidipine is a short-acting, intravenous calcium channel blocker used in the management of hypertension in the perioperative period. It selectively binds to L-type calcium channels in smooth muscle cells, leading to vasodilation and a decrease in blood pressure.
**Why the Correct Answer is Right**
Clevidipine is a phenylalkylamine derivative that inhibits the influx of calcium ions into vascular smooth muscle cells, resulting in a decrease in peripheral resistance and a subsequent reduction in blood pressure. Its rapid onset and short duration of action make it an ideal agent for controlling blood pressure in the perioperative period, particularly in patients undergoing cardiac surgery. The mechanism of action is similar to other calcium channel blockers, such as nicardipine and verapamil, but clevidipine's unique pharmacokinetic profile allows for more precise control over blood pressure.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because clevidipine is not a beta-blocker, which is a different class of antihypertensive agents that work by blocking the effects of epinephrine on the heart and blood vessels.
**Option B:** This option is incorrect because clevidipine is not a diuretic, which is a class of antihypertensive agents that work by increasing the amount of urine produced by the kidneys.
**Option C:** This option is incorrect because clevidipine is not an alpha-blocker, which is a class of antihypertensive agents that work by blocking the effects of norepinephrine on smooth muscle cells in the blood vessels.
**Clinical Pearl / High-Yield Fact**
Clevidipine is a useful alternative to other antihypertensive agents in the perioperative period, particularly in patients with renal impairment or those who are at risk of hypotension.
**Correct Answer: C. A short-acting, intravenous calcium channel blocker used in the management of hypertension in the perioperative period.**