Department of Zoology, University of Canterbury, Christchurch, New Zealand.
Fish Physiol Biochem. 1989 Sep;6(5):327-31. doi: 10.1007/BF01881687.
The maximum power output of isolated perfused ventricles of the hafish (Eptatretus cirrhatus) averaged 0.367±0.031 mW g(-1) (n=9), considerably high than estimates for the heart of the Atlantic hagfish (Myxine glutinosa). Maximal minute volumes averaged 21.55±1.28 ml min(-1)kg(-1), with a mean stroke volume of 0.71±0.14 ml kg(-1) body weight, values which are similar to those reported for many teleost and elasmobranch hearts.Ventricular output showed the characteristic dependence upon atrial filling pressure up to an optimum filling pressure ofc. 4 mm Hg. At output pressures exceeding 14 mm Hg the stroke volume and power output fell sharply. At these afterloads, the ventral aorta remained distended following semilunar valve closure and so the volume of fluid ejected on ventricular systole was reduced. There was little change in the frequency of the heart as either input or output pressures were varied.
海鳝（Eptatretus cirrhatus）离体灌流心室的最大功率输出平均为 0.367±0.031 mW g(-1)（n=9），明显高于大西洋七鳃鳗（Myxine glutinosa）心脏的估计值。最大分钟体积平均为 21.55±1.28 ml min(-1)kg(-1)，平均每搏量为 0.71±0.14 ml kg(-1)体重，这些值与许多硬骨鱼和软骨鱼心脏报告的值相似。心室输出显示出对心房充盈压力的特征依赖性，直到最佳充盈压力约为 4 毫米汞柱。在输出压力超过 14 毫米汞柱时，每搏量和功率输出急剧下降。在这些后负荷下，半月瓣关闭后腹主动脉仍然扩张，因此心室收缩时喷射的液体体积减少。随着输入或输出压力的变化，心脏的频率几乎没有变化。
