The Valsalva maneuver is performed by a forceful attempt of exhalation against a closed airway, usually done by closing one’s mouth and bearing down while trying to lift a heavy object. True False
The correct answer and explanation is:
The correct answer is True.
The Valsalva maneuver involves a forceful attempt at exhalation against a closed airway. This is typically achieved by closing the mouth, pinching the nose, and then trying to exhale forcefully, as if you are attempting to blow air out without allowing it to escape. The maneuver can also be done by bearing down, which involves a straining action that increases intra-abdominal pressure. People commonly perform this maneuver when lifting heavy objects or during activities such as childbirth or defecation.
When the Valsalva maneuver is performed, the increased pressure in the chest can temporarily affect the cardiovascular system. The maneuver causes an initial rise in intrathoracic pressure, which compresses the large veins returning blood to the heart, briefly reducing venous return. This leads to a temporary decrease in cardiac output and blood pressure. However, once the maneuver is released, blood flow to the heart increases rapidly, causing a rebound effect that may result in a brief increase in heart rate and blood pressure. These changes can be particularly pronounced in individuals with heart conditions, making the Valsalva maneuver potentially dangerous in certain circumstances.
The Valsalva maneuver is sometimes intentionally used in medical settings to evaluate heart function or to treat certain medical conditions. For example, it is used in tests to assess baroreceptor reflex sensitivity or to help restore normal heart rhythms during certain arrhythmias, such as supraventricular tachycardia (SVT). Despite its potential benefits in these contexts, the Valsalva maneuver should generally be done with caution, especially for people with heart disease, hypertension, or other medical conditions that might be exacerbated by the sudden changes in blood pressure.