XXXX : a comparison of right versus left heart compression.

@entity235 @entity1002 @entity64 @entity2293
It has been postulated that in @entity2293 , the hemodynamic effects of compression of the right heart chambers and great veins are more important than are the effects of left heart compression. In 10 anesthetized @entity235 with surgically compartmented pericardium, the hemodynamic effects of right atrial and right ventricular compression were compared with the hemodynamic effects of left @entity1002 . The effects of right heart compression, left heart compression, and then effects of combined right and left heart compression, were compared at three levels of intrapericardial pressure: 10, 15 and 20 mm Hg. Aortic mean pressure decreased significantly at each level of intrapericardial pressure with right-sided tamponade but not with left-sided tamponade. Left atrial mean pressures decreased significantly with right-sided tamponade and increased with left-sided and combined tamponade. Right atrial mean pressures increased significantly with right-sided and combined tamponade, but not with left-sided tamponade. Heart rate increased significantly with each of the three varieties of tamponade. Cardiac output and @entity64 volume, which decreased with each variety of tamponade, were significantly lower during right-sided than during left-sided tamponade. Combined tamponade lowered @entity64 volume more than did right-sided tamponade, and lowered cardiac output more at 15 and 20 mm Hg intrapericardial pressure. It is concluded that, in this preparation, right-sided cardiac compression has more important hemodynamic effects than does left-sided compression. However, left-sided tamponade still makes a significant contribution to the total hemodynamic picture of @entity2293 .
