[Hybrid ECG and its clinical significance for the detection of coronary heart disease].
451 male patients with typical or atypical angina pectoris syndrome were examined and on account of the degree of severity of the coronary stenosis are subdivided into four groups. With the help of the discriminance analysis of a hybrid ECG (conventional and body surface ECG after Frank) the patients were coordinated to these four groups, in order to test its clinical valency for the recognition of the coronary heart disease. It was stated that in a scalar interpretation of the body surface ECG in every case the conventional leads V3 and/or II after Einthoven must additionally be registered and evaluated. In a scalar and vectorial interpretation of the body surface ECG a significant gain of information was possible only by taking into consideration a great number of scalar parameters of the conventional ECG. The result of the discriminance analysis with the optimum quantity (p = 88) of scalar and vectorial parameters of the two derivation systems contained a correct classification rate of 84.1%, in which case 88.6% of the post-infarction ECG were classified correctly. Neither by means of the conventional nor by means of the body surface ECG after Frank an equivalent result could be yielded. When a computer technology is existing (automatic statement of measuring values with following discriminance analysis) therefore in specialized clinics such a hybrid ECG should be used.