Bedside serial comparison of electrocardiograms.

A unique method for serial comparison of electrocardiograms is introduced. A Siemens 440 or 740 electrocardiograph can be linked directly to a central minicomputer system, from which serial data for up to three previously recorded ECGs from the same patient can be retrieved and transferred back to the ECG machine. Serial comparison logic has been incorporated into the diagnostic program inside the 440 and 740 so that immediate serial comparison can be undertaken at the bedside or in the clinic.