80m氦氧饱和—100m巡回潜水时的动态心电图分析

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

The study deals with the observation of the changes in the electrical activities of the heart in 8 healthy divers during 80m heliox saturation-100m excursion dive by means of an ambulatory ECG.Results showed that there was significant change in the 24h average heart rate,and the decrease of heart rate at saturation storage depth and decompression periods were 15.5% and 19.7% respectively.An immediate recovery of the heart rate was closely related to the increment of PO2,which clearly indicated that hyperbaric oxygen was the main cause of bradycardia.Associated with heart rate decrement were supraventricular arrhythmias in 8 divers and ventricular arrhythmias in 5 divers.However,the occurrence of arrhythmia was infrequent,all being isolated premature beats.Transient ischemic ST-T changes in 6 divers occurred repeatedly during diving operations.On the second day postdive,the 12-lead routine ECG was all normal.It is the authors' view that the ST-T chang was due to 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 closed restricted chamber environment.