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Development of heart rate irregularities in chick embryos.

机译:鸡胚心律不规则的发展。

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Heart rate (HR) irregularities in chick embryos were defined as large fluctuations (>10 beats/min) comprising irregular, brief deceleration and/or acceleration of instantaneous HR (IHR). IHR was determined directly from the arterial blood pressure while adequate gas exchange was maintained through an eggshell and chorioallantoic membrane. Five embryos were examined on each day from day 11 to day 19 of incubation. Baseline HR was stable until day 12-13, and on around day 13-14 transient, rapid deceleration of HR (termed V pattern) began to appear, with a subsequent increase in its frequency and magnitude. The acceleration patterns (lambda, avian omega, and periodic patterns) appeared later, and the IHR became increasingly irregular, with additional, spontaneous deceleration and acceleration patterns toward hatching. Additional experiments with intravenous administration of autonomic drugs clearly showed that rapid deceleration of HR was mediated by parasympathetic nervous function but did not always show clear relations of sympathomimetic and sympathetic blocking agents to the acceleration patterns.
机译:雏鸡胚胎的心率(HR)异常被定义为较大的波动(> 10次/分钟),包括瞬时HR(IHR)的不规则,短暂减速和/或加速。 IHR直接由动脉血压确定,同时通过蛋壳和绒膜尿囊膜维持足够的气体交换。从孵育的第11天到第19天,每天检查五个胚胎。基线HR一直稳定到12-13天,并在13-14天左右开始出现HR的快速,快速减速(称为V型),随后频率和幅度增加。后来出现了加速模式(lambda,禽Ω和周期性模式),并且《国际卫生条例》变得越来越不规则,伴随着额外的,自发的减速和向孵化的加速模式。静脉注射植物药的其他实验清楚地表明,HR的快速减速是由副交感神经功能介导的,但并不总是表明拟交感神经药和交感神经阻滞剂与加速模式之间存在明确的关系。

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