Table 3

The P-Wave Morphology During Tachycardia

Pt. No.ECG Lead
IIIIIIaVLaVRaVFV1V2V3V4V5V6
1isoisoisoisoisoiso−/+−/+−/+−/+−/+−/iso
2isoposposisoisoiso−/+−/+−/+−/+−/+−/iso
3negposposisoisopos−/+−/+−/+−/+−/isoiso/iso
4isoisoisoisoisoiso−/+−/iso−/iso−/iso−/isoiso/iso
5isoposposisoisopos−/+−/+−/+−/isoiso/isoiso/iso
6isoposposnegisopos−/+−/+−/iso−/iso−/isoiso/iso
7isoposposnegnegpos−/+−/+−/+−/+−/+−/+

ECG = electrocardiographic; iso = isoelectric; neg = negative; pos = positive; −/+ = biphasic (negative then positive).