A program is described, which compares serial ECG recordings of patients, who suffered a myocardial infarction. The comparison of the ECGs is based on the measurements, delivered by the Modular ECG/VCG Interpretation System. The two most recent ECGs are compared and a trend analysis based on all ECG recordings of the patient is performed. The criteria in the comparison program are based, among others, on data obtained from a combined cardiological and respiratory survey in The Netherlands in 1973 and 1976.