Final answer:
Squatting does not increase the severity of mitral valve prolapse, unlike inhalation of amyl nitrate, the Valsalva maneuver, and moving from supine to standing, which all can exacerbate the condition.
Step-by-step explanation:
Maneuvers that increase the duration and severity of mitral valve prolapse include the use of inhalation of amyl nitrate, performing the Valsalva maneuver, and transitioning from supine to standing. These maneuvers generally decrease the volume of the left ventricle, leading to enhanced prolapse of the mitral valve into the left atrium during systole. However, squatting is not a maneuver that will increase the severity of mitral valve prolapse. In fact, squatting increases venous return to the heart, increases left ventricular volume, and may actually decrease the prolapse of the mitral valve. Therefore, option D, squatting, is the maneuver that does not increase the duration and severity of mitral valve prolapse.