**Core Concept**
Systemic vascular resistance (SVR) is a critical parameter in hemodynamics, reflecting the resistance to blood flow in the systemic circulation. It is calculated as the mean arterial pressure (MAP) divided by cardiac output (CO). An increase in SVR indicates increased peripheral resistance, which can lead to elevated blood pressure.

**Why the Correct Answer is Right**
An increase in SVR is often seen in conditions such as heart failure, severe hypertension, or vasospasm. In such cases, the primary goal of treatment is to reduce the SVR and alleviate the increased workload on the heart. This can be achieved through vasodilators, which act on the smooth muscle of blood vessels to relax and widen them. Vasodilators can be administered intravenously, orally, or transdermally, depending on the specific agent and clinical scenario. Common vasodilators include nitroprusside, hydralazine, and diazoxide.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because diuretics, while useful in treating fluid overload and hypertension, do not directly decrease systemic vascular resistance.
**Option B:** This option is incorrect because beta-blockers, while useful in treating hypertension and heart failure, can actually increase systemic vascular resistance by reducing cardiac output and increasing peripheral resistance.
**Option C:** This option is incorrect because inotropes, while useful in treating heart failure, do not directly decrease systemic vascular resistance and may even increase it by increasing cardiac contractility.

**Clinical Pearl / High-Yield Fact**
In the context of increased systemic vascular resistance, it is essential to remember that vasodilators can rapidly decrease blood pressure and cardiac workload, but they should be used with caution to avoid hypotension and reflex tachycardia.

**Correct Answer: C. Nitroprusside.