Figure 32-33 Pulmonary artery wedge pressure (PAWP) is a damped, delayed reflection of left atrial pressure (LAP). The tall regurgitant v waves (v) caused by severe mitral regurgitation are seen clearly in the LAP trace but appear delayed and smaller in magnitude in the PAWP trace. (Redrawn from Mark JB: Atlas of Cardiovascular Monitoring. New York, Churchill Livingstone, 1998, Fig. 4-4.)