Computerized database for coronary bypass surgery.

A computer-assisted system has been developed to store, retrieve and analyze medical and surgical data on patients undergoing coronary bypass surgery. The analysis ranges from a simple summary tabulation to a more advanced prognostic evaluation of the risk of coronary bypass in an individual candidate for the operation. Data can be displayed on the terminal's screen or printed in a hard copy and used for clinical or administrative purposes.

Coronary artery bypass in patients under 40 years of age.

Coronary artery bypass surgery was performed in 92 patients, ranging in age from 20 to 40 years. The male-to-female ratio was 5:1. The operative mortality was 3.

A transparent overlay for assessing amplitude of ECG wave forms.

The amplitude of ECG wave forms can be evaluated rapidly and accurately with the help of a transparent overlay depicting images of the P-QRS-T complex in various leads. Such images are drawn between the upper and lower limits of normal amplitude values and by placing them over the corresponding P-QRS-T complexes in the patient's record it is possible to determine in a matter of seconds whether various deflections are within normal limits.

A simple method for analysis of vectorcardiograms.

Vectorcardiographic loops can be evaluated with the help of transparent overlays depicting normal ranges for the magnitude and orientation of various P, QRS and T vectors in each of the three conventional planes. By appropriate positioning of such overlays over vectorcardiographic loops it is possible to determine in a matter of seconds whether or not the magnitude and/or orientation of various vectors are within normal limits.

A grid for calculating vectorcardiographic loop areas.

A graph consisting of small squares of equal size preprinted on a transparent plastic chart can be used for a quick and accurate calculation of the VCG loop area in each quadrant of the three conventional planes.

A scale for ECG rhythm analysis.

A simple scale, which allows the ECG reader to assess the regularity of the RR (or PP) interval and to detect the P wave train, has been presented.

Validity of computer interpretation of the electrocardiogram.

Evaluation of the accuracy of computer interpretation of 2019 standard 12-lead ECG's has been carried out. In 762 records defined as normal by the cardiologist the computer agreed in 41%, found 49% with minor "abnormalities" and read 10% as having gross abnormalities.There were 1257 abnormal records.