XXII. Note on independent pulsation of the pulmonary veins and vena cava
XXII. Note on independent pulsation of the pulmonary veins and vena cava
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第二十二．
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通讯作者：
J. Fayrer
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作者：
T. Brunton;J. Fayrer
在以前的通信中，我们偶然提到，在一只被注射眼镜蛇毒素到颈静脉中杀死的兔子中，我们观察到在心脏腔中的所有运动都停止之后，肺静脉搏动。从那以后，我们又观察了三、四次同样的现象，而这些情况表明，这种脉动并不是由于我们第一次观察到的那只被毒死的眼镜蛇毒液的作用。下面的例子将显示在这些脉动中观察到的节奏变化。一只猫被氯仿麻醉，迷走神经被暴露出来，并被中断的电流刺激。用含有氯仿蒸汽的空气维持人工呼吸，然后打开胸腔，用伍德注射器将阿托品溶液直接注入心脏。迷走神经再次受到刺激，但对心脏没有产生任何影响，心脏中的抑制器官显然因斜视而瘫痪。现在以类似的方式将一种Physostigma的甘油提取物溶液注射到心脏中。迷走神经现在又受到刺激，心脏停止了跳动，眼球萎缩的影响被红斑抵消了。刺激停止后，心脏又开始搏动。
In a former communication we incidentally mentioned that in a rabbit killed by the injection of cobra-poison into the jugular vein we had observed the pulmonary vein pulsating after all motion had ceased in the cavities of the heart. We have since observed the same phenomenon three or four times under conditions which show that this pulsation is not due to the action of the cobra-poison with which the animal in which we first observed it had been killed. The following example will show the changes in rhythm observed in these pulsations. A cat was chloroformed, and the vagi exposed and irritated by an interrupted current. Artificial respiration was kept up by air containing chloroform vapour, and the thorax was then opened, and a solution of atropia injected directly into the heart by means of a Wood’s syringe. The vagi were again irritated, but without any effect being produced on the heart, the inhibitory apparatus in it being evidently paralyzed by the atropia. A solution of glycerine extract of physostigma was now injected into the heart in a similar way. The vagi were now irritated again, and the heart stood still, the effect of the atropia having been counteracted by the physostigma. After the irritation ceased the heart again commenced to pulsate.