Material and Methods
We have studied 217 consecutive cardiac patients(86 women, 131 males)in an ambulance,[ at where worked-up( control or diagnosis) for a cardiac event. After recording the EKG with a standard 12 lead-EKG (HP 7, Hewlett-Packard), a recording with a P 12 (Aerotel, Israel) 12 lead-EKG, by a layman, was done and transmitted. The P 12 is a 180 grams device, battery-equipped, with the dirnensions of a small cellular phone. It records 12 leads (0.05- 150 Hz), with an internal acoustic-transmiter(1900 Hz) capable of transmitting through the phone to a PC (pentium 100 DX with Netware Card)an EKG recording, that will then be printed in.The 6 peripheral leads are recorded with 2 armpit elcctrodes, and the left area( indifferent electrode)is recorded through 3 contact points at the back of the device( with 2 diflerent positions to apply, in order to obtain 6 different recorded leads). Afler transtelephonic iransmission to the medical center at the Munich Airport (CardioSafe), the recording was printed and analyzed, and send to the Frankfort Cardiac Center. Both 12 lead recordings
(standard and p l2) were interchanged and re-analyzed at different moments by different physicians. With diverging findings the exchanged EKG were re-analyzedb by 2 other cardiologists, in order to correct the bias of observation variability. Comparisons were then analyzed with correlation tests, and significant differences were considered when appropriaie. Sensitivity and specificity ratios were applied for non-nurnerical parameters

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