<prompt> Each of the following is a sign of impaired ventricular function except-RaisedJVPNarrow pulse pressureEnd-inspiratory lung crepitationsTapping apical impulse  <response>: Hea failure can clinically present with predominantly diastolic or systolic dysfunction, or both. Diastolic HF is a progressive disorder characterized by impaired left ventricular LV relaxation, increased LV stiffness, increased interstitial deposition of collagen and modified extracellular matrix proteins The most common cause of a low narrow pulse pressure is a drop in left ventricular stroke volume. In trauma, a low or narrow pulse pressure suggests significant blood loss insufficient preload leading to reduced cardiac output. A narrow pulse pressure is also caused by aoic valve stenosis and cardiac tamponade Ref Harrison 20th edition pg 1436 