The oxygen pressure histogram in the left ventricular myocardium of the dog
The oxygen pressure histogram in the left ventricular myocardium of the dog
复制标题
狗左心室心肌氧分压直方图
DOI：
10.1007/bf00584292
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发表时间：
1975
期刊：
影响因子：
--
通讯作者：
N. Niederle
中科院分区：
文献类型：
--
作者：
B. Lösse;S. Schuchhardt;N. Niederle
本文用极谱法测定了麻醉开胸犬心肌动脉和冠状静脉的氧分压。在正常动脉O2供应下，心肌中存在宽的Po2谱，范围从约0 Torr到动脉值（平均值19.3 Torr，中值14 Torr）。60%的值低于18.8 Torr的平均冠状静脉Po2，最大值在0至5 Torr的范围内。在中度动脉低氧血症（平均动脉Po2 63.7 Torr）下，直方图的形状和平均冠状静脉Po2均无显著变化。动脉血氧分压增加到300 Torr以上时，冠状静脉血氧分压没有明显变化，而心肌血氧分压显示出异质反应。心肌以及冠状静脉Po2似乎是很好地调节在一个广泛的动脉Po2。
SummaryMyocardial Po2 in its relation to arterial and coronary venous Po2 was measured in anesthetized open-chest dogs by means of polarographic methods. At normal arterial O2 supply, there exists a broad Po2 spectrum in the myocardium, ranging from about 0 Torr to arterial values (mean 19.3 Torr, median 14 Torr). 60% of the values are below the mean coronary venous Po2 of 18.8 Torr, the maximum is in the class of 0 to 5 Torr. Neither the shape of the histogram nor the mean coronary venous Po2 are significantly changed under moderate arterial hypoxemia (mean arterial Po2 63.7 Torr). Also increases in arterial Po2 to more than 300 Torr cause no distinct change in coronary venous Po2, whereas myocardial Po2 shows heterogeneous reactions. Myocardial as well as coronary venous Po2 seem to be well regulated over a wide range of arterial Po2.