Table 1

P-Wave Morphology

ECG Lead
IIIIIIaVLaVRV1V3V6
iso 11neg 13neg 13pos 13pos 13neg/pos 7neg 8neg 10
low pos 2iso/pos 5biphasic 3iso 2
neg 1iso 2biphasic 1

ECG = electrocardiographic; iso = isoelectric; neg = negative; pos = positive.