To investigate the effects of an exposure to a radiofrequency field from a mobile phone on electrocardiographic parameters in patients with a history of ischemic heart diseases, taking gender into consideration.
A total number of 356 participants (129 males and 227 females) were admitted in this study. They were divided into the following groups: 1.) healthy subjects without heart diseases (n=142), 2.) patients with ischemic heart diseases (n=104) and 3.) patients with a history of heart diseases not related to myocardial ischemia (n=110).
After a stabilizing period of 10 minutes, the ECG was recorded without any cell phone (baseline). Then, a cell phone was placed on the left side of the lower abdomen at the belt level (belt level) and rang once for 40 seconds during ECG recording. After 5 minutes, the cell phone was placed in the left side chest pocket (precordial) and rang once for 40 seconds with simultaneous ECG recording.
Exposure duration: 2 times for 40 seconds
In healthy males, the ringing cell phone, placed at belt level, decreased the RR interval and increased the QT interval significantly compared to the baseline. The ringing cell phone in precordial position significantly prolonged the QT interval compared to the baseline. In healthy females, the ringing cell phone in precordial position led to an increase in the heart rate compared to the basis values.
In male probands with ischemic heart diseases, the duration of the QRS complex was significantly increased in both cell phone positions when compared to the baseline. Additionally, the QT interval and the R wave were significantly prolonged when the ringing cell phone was placed precordial in comparison to the baseline.
Male probands with heart diseases not related to myocardial ischemia showed significant prolongation of the QT interval when the ringing cell phone was placed in precordial position or in belt level in comparison to the baseline.
The authors conclude that a ringing cell phone prolonged the QT interval in men with and without ischemic heart diseases and that females are immune from these effects.