What is the mechanism of action of Nifedipine in the context of a hemorrhagic stroke?

• A. Increases cerebral perfusion
• B. Prevents cerebral vasospasm
• C. Reduces blood viscosity
• D. Enhances clotting factors

Answer: (B)

Nifedipine is a calcium channel blocker, primarily acting by inhibiting calcium influx through L-type calcium channels in vascular smooth muscle. In the context of a hemorrhagic stroke, one of the critical complications that can arise is cerebral vasospasm, which can lead to secondary ischemic injury following the initial hemorrhagic event. By preventing cerebral vasospasm, Nifedipine helps maintain adequate cerebral blood flow and perfusion, thereby reducing the risk of further neurological damage.

The choice of Nifedipine for this purpose hinges on its ability to promote vasodilation in cerebral blood vessels, counteracting vasospasm that may worsen the condition of the patient. In contrast, options that mention increasing cerebral perfusion, reducing blood viscosity, or enhancing clotting factors do not directly align with the pharmacological actions of Nifedipine in this specific clinical context. Thus, its role in preventing vasospasm is critical for improving outcomes in patients who have experienced a hemorrhagic stroke.