Which vagal maneuver involves bearing down as though having a bowel movement?

The Valsalva maneuver is a technique that involves a forced expiration against a closed airway, which can be effectively performed by bearing down as if having a bowel movement. This action increases intrathoracic pressure and induces a reflex response that can help manage certain types of abnormal heart rhythms by affecting autonomic nervous system activity, particularly vagal tone. When the pressure is released, it can lead to a rebound effect that can restore normal heart rhythm.

This maneuver has specific physiological effects that can be beneficial in various clinical scenarios, such as supraventricular tachycardia. Understanding the mechanics of this maneuver helps medical professionals administer it correctly in appropriate situations to assist in managing certain cardiac conditions.