Influence of acute alterations in cycle length on ventricular function in chick embryos.

Influence of acute alterations in cycle length on ventricular function in chick embryos.
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周期长度的急性改变对鸡胚胎心室功能的影响。

DOI:
10.1152/ajpheart.1994.267.3.h905
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发表时间:
1994
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Keller,BB
Keller,BB
中科院分区:
--
文献类型:
--
作者:
Casillas,CB;Tinney,JP;Keller,BB

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在心脏形态发生过程中,心率 (HR)、发展压和每搏输出量 (SV) 急剧增加。在周期长度 (CL) 急剧变化期间,鸡胚胎通过 SV 的代偿性变化来维持心输出量。我们确定了来亨鸡胚胎第 21 阶段 CL 变化期间的胚胎压力-容积关系,以量化 CL 与心脏时间间​​隔、心室前负荷和心室功能之间的关系。将 1 毫米随机预热或冷却的金属探针应用于静脉窦,CL 瞬时改变为初始基线 CL 的 73-191%。等长舒张、舒张充盈和收缩射血时间与 CL 呈线性变化,而等长收缩时间相似。 SV 随 CL、射血时间和舒张末期容积呈线性变化。与成熟心脏相反,SV 和收缩末压之间的关系是相反的。胚胎心室前负荷受到舒张充盈时间的强烈影响,并且在 CL 变化期间,心输出量通过与 SV 与 HR 成反比的心室-血管相互作用而得到优化。
Heart rate (HR), developed pressure, and stroke volume (SV) increase dramatically during cardiac morphogenesis. During acute changes in cycle length (CL), the chick embryo maintains cardiac output by a compensatory change in SV. We determined embryonic pressure-volume relations during alterations in CL in the stage 21 while Leghorn chick embryo to quantitate the relationship between CL and cardiac time intervals, ventricular preload, and ventricular function. CL was transiently altered to 73-191% of initial baseline CL with a 1-mm randomly preheated or cooled metal probe applied to the sinus venosus. Isometric relaxation, diastolic filling, and systolic ejection times varied linearly with CL, whereas isometric contraction times were similar. SV varied linearly with CL, ejection time, and end-diastolic volume. In contrast to the mature heart, the relationship between SV and end-systolic pressure was inverse. Embryonic ventricular preload was influenced acutely by diastolic filling time, and cardiac output was optimized during changes in CL by ventricular-vascular interactions that matched SV inversely to HR.
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