NREMT Paramedic Practice

What is the primary function of sympatholytic agents?

1. Enhance sympathetic nervous system activity

2. Block the actions of the sympathetic nervous system

3. Stimulate adrenergic receptors

4. Promote increased heart rate

The correct answer is: Block the actions of the sympathetic nervous system

Sympatholytic agents primarily function by blocking the actions of the sympathetic nervous system. These medications inhibit the effects that are typically mediated by adrenergic receptors, which are activated by neurotransmitters like norepinephrine. In practical terms, this means that sympatholytic agents can reduce heart rate, lower blood pressure, and decrease cardiac output, counteracting the fight-or-flight responses that the sympathetic nervous system triggers during stressful situations. This action is beneficial in conditions such as hypertension, anxiety, and certain types of heart disease, where the goal is often to lessen the impact of sympathetic stimulation. The other choices describe actions that are contrary to the primary function of sympatholytic agents. Enhancing sympathetic nervous system activity, stimulating adrenergic receptors, or promoting an increased heart rate all reflect sympathetic activity rather than the antagonistic action of sympatholytics.