The Valsalva maneuver typically leads to a transient increase in blood pressure followed by a decrease. During the maneuver, increased intrathoracic pressure reduces venous return to the heart, initially causing a drop in cardiac output and blood pressure. However, the body's baroreceptor reflex responds to this drop by increasing heart rate and constricting blood vessels, which can temporarily raise blood pressure. After the maneuver is released, blood pressure often rebounds as normal venous return resumes.
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