On the Significance of the Bipolar Chest Lead in Ecg Between Apex Cordis and the Left Posterior Axillary Line

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Abstract
The negative T-wave of the bipolar chest recording J, between the apical region and the left posterior axillary line was studied in 116 cases showing an otherwise normal ecg. Of the material, 40 cases were considered normal and the negativity of T in J of these cases was 0.38 mm, SD: 0.18 for female and 0.30 mm, SD: 0.20 for male subjects. Seventy-six cases with probable heart disease showed a negativity of T in J of 0.94 mm, SD: 0.51 for female and 1.26, SD: 0.79 for male subjects. A negativity of T in J of 1 mm = 0.1 mV or more is strongly suspect of being pathological. A less pronounced negativity might be a pathological sign and should always be followed up. Bipolar chest leads should have a place in routine ecg.