抄録
On-line diagnosis of electrocardiograms, including arrhythmias, was made successfully by a small-scale digital computer system.
This system is composed of a JRA-5 spectrum computer (with core memory capacity of 4096 words, 16 bits for each), an internally installed four channels, 8 bits for each of analog-to-digital conversion unit and an annexed magnetic drum of 8 192 words, 16 bits in length. In addition, a photo-reader, a tape puncher and a teletype (33 ASR) are installed. The X, Y and Z records of Frank lead system were used for automatic analysis and were fed from an electrocardiograph through the buffer amplifier into the computer. As the logic of diagnosis, a combination of branching logic and joint probability was adopted. It took about 10 seconds for the interpretation of ECGs.
For analysis of arrhythmias, the X or Y record of Frank lead system was fed into the computer for a period of 20 seconds, and measuring of RR and PQ intervals, and QRS duration and detection of P and f waves were performed.
Using these parameters, arrhythmia was interpreted automatically in 15 seconds.
The program for the arrhythmia was applied to monitor the heart beats of patients in the coronary care unit.
Computer analysis of phonocardiograms was also undertaken by the same computer system. The phonocardiogram was replaced by two continuous curves of maximum amplitude and a number of zero-crossing every 8 ms. The pattern recognition of heart sound was made, using the two computed curves.
This system may be suitable for-automatic analysis of analog information in the medical field.
