80m氦氧饱和-100m巡回潜水时的动态心电图分析

本文用动态心电图观察了8名潜水员在80m氦氮饱和—100m巡回潜水过程中心电的变化,发现24h平均心率有明显改变,心率降低在饱和停留及减压阶段分别为15.5％及19.7％,减压结束后心率立刻回升,并发现心率的降低与氧分压增加密切相关,故强调高压氧为引起心动过缓的主要原因。8名潜水员出现室上性心律紊乱,5名潜水员出现室性心律紊乱。心律紊乱的出现率较潜水前略为增高,且均为偶发性或孤立性早搏。6名潜水员在潜水作业全过程,反复出现短暂的缺血型ST-T改变,潜水后第二天的12导联常规心电图全部正常。讨论认为此ST-T改变可能系高气压、高分压氧、噪音及狭窄的密闭环境等应激因子综合影响所造成的应激反应。

AN ANALYSIS OF AMBULATORY ECG IN THE 80m HELIOX SATURATION-100m EXCURSION DIVE

The study dealt with the observation of the changes in the elcctrical activities of heart in 8 healthy divers in the 80m heliox saturation-100m excursion dive by means of ambulatory ECG.The Results showed a significant change in the 24hour average heart rate.The decrease of heart rate at saturation storage depth and decompression period was 15.5% and 19.7% respectively.An immediate recovery of the heart rate was closely related to the increment of PO-2, which clearly explained that hyperbaric oxygen was the main cause of bradycardia. Associated with the heart rate decrement were supraventricular arrhythmia in 8 divers and ventricular arrhythmia in 5 divers. The occurrence of arrhythmia during exposure was infrequent, all being isolated premature beats. Transient ischemic ST-T changes in 6 divers occurred repeatedly during the diving operations.On the second day postdive, the 12-lead routine ECG all showed normal. The discussion put up the view that the ST-T change was due to the stress reaction of the body induced by the combined effect of such stress factors as hyperbaric pressure per se, high partial pressure of oxygen,noise and the restricted and closed chamber environment.