A device for producing high frequency electrocardiograms on a conventional direct writing electrocardiograph

A device has been developed which can be used in conjunction with a direct-writing electrocardiograph to record the high frequency electrocardiogram (ECG) including notches and slurs in the waveform. The device operates on the principle of temporarily storing the QRS complex and then reproducing it at a rate 10 times slower than real time. Increasing the ratio to 80 to 1 permits registration of pulse artifacts from implanted cardiac pacemakers.