Which pharmacologic class is commonly used to treat autonomic hyperreflexia?

Which pharmacologic class is commonly used to treat autonomic hyperreflexia?

• A. Beta-blockers
• B. Alpha-adrenergic receptor antagonists
• C. Ganglionic blockers
• D. Diuretics

Answer: (B)

Autonomic hyperreflexia causes a dangerous spike in blood pressure from unopposed sympathetic activity below a spinal cord injury. The most effective way to counter this is to block the vasoconstrictive action of that sympathetic outflow. Alpha-adrenergic receptor antagonists prevent norepinephrine from constricting vascular smooth muscle, allowing rapid vasodilation and lowering of blood pressure. This makes them the preferred class for treating the acute hypertensive surge and for prophylaxis in susceptible patients. Beta-blockers don’t directly counter the peripheral vasoconstriction and can leave alpha-mediated vasoconstriction unchecked, which is less effective and potentially harmful. Ganglionic blockers are rarely used today due to broad autonomic effects and safety concerns, and diuretics don’t address the immediate mechanism driving the hypertension.

Autonomic hyperreflexia causes a dangerous spike in blood pressure from unopposed sympathetic activity below a spinal cord injury. The most effective way to counter this is to block the vasoconstrictive action of that sympathetic outflow. Alpha-adrenergic receptor antagonists prevent norepinephrine from constricting vascular smooth muscle, allowing rapid vasodilation and lowering of blood pressure. This makes them the preferred class for treating the acute hypertensive surge and for prophylaxis in susceptible patients. Beta-blockers don’t directly counter the peripheral vasoconstriction and can leave alpha-mediated vasoconstriction unchecked, which is less effective and potentially harmful. Ganglionic blockers are rarely used today due to broad autonomic effects and safety concerns, and diuretics don’t address the immediate mechanism driving the hypertension.