Reliability of telephone transmission facilities for computerized electrocardiogram analysis in Japan

The reliability of telephone electrocardiogram (ECG) transmission facilities was assessed in order to carry out the computerized ECG analysis using the IBM-Bonner program. Simulated ECGs were transmitted repeatedly over telephones from an internal laboratory and from an external hospital which was 1,000 Km distant. The simulated ECG was transmitted in a highly reproducible state and with no appreciable distortion. The telephone ECG transmission facilities using the public telephone network in Japan proved to reliable for computerized ECG analysis.