Which maneuver aids in uncovering potential diastolic dysfunction while performing pulsed wave Doppler of the...

The Valsalva maneuver transiently reduces preload, which can unmask or exaggerate diastolic dysfunction during mitral inflow Doppler assessment. During Valsalva, changes in mitral E and A wave velocities can differentiate between normal and pseudonormal filling patterns by observing alterations in filling pressures.

Hand grip, leg air cycling, and squatting affect afterload and preload differently but are less specific for assessing diastolic dysfunction via mitral Doppler.

This technique is outlined in the "Textbook of Clinical Echocardiography, 6e", Chapter on Diastolic Function Assessment and Maneuvers【20:210-215†Textbook of Clinical Echocardiography】.