Both aeriolar and venodilator drug is: September 2007
First, I should recall which drugs have both arteriolar and venodilatory effects. Common drugs that come to mind include nitrates like nitroglycerin. Nitroglycerin is a potent venodilator and also causes some arteriolar dilation. Another possibility is hydralazine, but I think hydralazine is more of an arteriolar dilator than a venous one. Then there's sodium nitroprusside, which is a balanced vasodilator affecting both arteries and veins. But sodium nitroprusside is more of a balanced vasodilator, so maybe that's the answer here. However, the question specifies "both arteriolar and venodilator," so maybe the key is to think about which of these drugs is known for both. Let me double-check.
Nitroglycerin is a venodilator, reducing preload, and it also has some arterial effects. Sodium nitroprusside acts on both, but it's more balanced. Then there's phentolamine, but that's a non-selective alpha blocker. Maybe the answer is sodium nitroprusside. Alternatively, maybe the correct answer is hydralazine, but no, hydralazine is primarily an arteriolar dilator. Another option could be nitroglycerin. Let me confirm. Nitroglycerin's primary effect is venodilation, but it does cause some arterial dilation as well. Sodium nitroprusside is a more balanced vasodilator. So depending on the context of the question, the answer could be either. However, given that the question is from September 2007, perhaps the answer is sodium nitroprusside. Alternatively, maybe the answer is nitroglycerin. Wait, the question is from a past exam, so I need to think about the options that were available back then. Also, the correct answer's letter isn't given here, but the user expects me to write the explanation based on the correct answer they provided. Since the user hasn't given the options, maybe I should proceed with the assumption that the correct answer is sodium nitroprusside or nitroglycerin. Let me check the mechanisms. Nitroglycerin is a nitrate that is a venodilator and has some arterial effects. Sodium nitroprusside is a direct-acting vasodilator that affects both. So the correct answer is sodium nitroprusside. Therefore, the correct answer would be C or D, but since the options aren't provided, I can't specify the letter. However, the explanation should focus on why sodium nitroprusside is the correct answer and why others are not. Let me structure the explanation accordingly.
**Core Concept**
This question tests knowledge of vasodilators with dual effects on arterioles and veins. Drugs that dilate both vessels lower both preload (venous return) and afterload (arterial resistance), which is critical in managing conditions like heart failure or hypertension.
**Why the Correct Answer is Right**
**Sodium nit