Nellis S H, Whitesell L
Cardiology Section, University of Wisconsin Medical School, Madison 53792.
Am J Physiol. 1989 Oct;257(4 Pt 2):H1056-61. doi: 10.1152/ajpheart.1989.257.4.H1056.
Previous data from this laboratory have revealed a large pressure pulse in small veins on the epicardial surface of the right ventricle of the rabbit. The phasic relationship between venule pressures and venule diameters in a beating heart was examined. Luminal pressures were measured in 39 different veins on the epicardial surface of the rabbit right ventricle. The venous luminal pressures averaged 12.6 mmHg maximum and 1.0 mmHg minimum. Pressures in 23 different small veins were also obtained at different right ventricular afterloads. Peak venous pressures increased with peak right ventricular pressure. The phasic diameter changes of 119 different vessels were examined. Vessel diameters decreased as luminal pressures increased. The average change in vessel diameter through a cardiac cycle was 20%, with a range from 0 to 60%. The large pulse pressures found in small veins appear to be related to decreasing vessel diameters and probably result from the displacement of blood as the vessels narrow.
该实验室之前的数据显示，在兔右心室心外膜表面的小静脉中存在较大的压力脉冲。研究了跳动心脏中小静脉压力与静脉直径之间的相位关系。在兔右心室心外膜表面的39条不同静脉中测量了管腔压力。静脉管腔压力平均最高为12.6 mmHg，最低为1.0 mmHg。还在不同的右心室后负荷下获得了23条不同小静脉的压力。静脉峰值压力随右心室峰值压力增加而升高。检查了119条不同血管的相位直径变化。血管直径随着管腔压力的增加而减小。一个心动周期中血管直径的平均变化为20%，范围为0至60%。在小静脉中发现的较大脉压似乎与血管直径减小有关，可能是由于血管变窄时血液的位移所致。
