[Analysis of ECG on the staffs exposed to microwave in the radio calling signal station].
321 electrocardiographies (ECG) from the staffs exposed to microwave in a radio calling signal station were analysed. The subjects exposed to microwave were female computer operators, who worked over six months in the station. 107 female non-exposers were served as control. The intensities of microwave in work site were below the standard (20-50 mW/m2). The abnormal prevalence of ECG in the exposed group was 27.73%, which was significantly higher than that in the control group (11.21%, P<0.01). The prevalence of sinus arrhythmia in exposed group (19.63%) was significantly higher than that in the control group (5.60%, P<0.01). The P-R intervals were also lengthened in exposed group [(0.1554+/-0.021) ms] than that in control group [(0.1487+/-0.0227) ms, P<0.01]. No significant differences were found in the heart rate, QRS intervals, Q-T intervals, sinus bradycardia, sinus tachycardia and left axis deviation between exposed and control groups (P>0.05). It suggested that computer operators exposed to microwave of lower intensity in the radio calling signal station might lead to sinus arrhythmia, due to the disorder of vegetative nerve system.
Li
H
H
Guangdong Occupational Disease Prevention & Treatment Centre, Guangzhou 510260, China.
D001146:Arrhythmia, Sinus / Q000453:epidemiology; D016022:Case-Control Studies; D004562:Electrocardiography / Q000706:statistics & numerical data*; D004574:Electromagnetic Fields / Q000009:adverse effects; D005260:Female; D006321:Heart / Q000502:physiology / Q000528:radiation effects; D006339:Heart Rate; D006801:Humans; D008872:Microwaves / Q000009:adverse effects*; D016273:Occupational Exposure / Q000009:adverse effects*; D015995:Prevalence