For the cadiologists out there, please help! If you have cardiace tamponade from a lesion in your LV (due to previous MI), would your pulm. cap. wedge pressure be high or low? My thoughts..... Since you have a leakage in your LV, then LV pressure falls, as does LA and the pulm. system. Because we now have a cardiac tamponade and HUGE pressure around the heart, this is stopping venous return, thus lowering the volume of blood in the heart proper. Lower volume equals lower pressure. So I think it would lower the PCWP. My colleagues and I are in a big argument over this. Their thinking is that even though you have the leak into the pericardial sac, this is not enough volume to lower the pressure of the heart. Thus, the increased pressure from the cardiac tamponade would increase pressure in the LV and back that all the way up to the pulm. caps, where the wedge pressure would read higher. Any insight to the heart experts out there? Thank you in advanced!