Table 2 Markedly increased pressure in the LA (isolated or biatrial) vs. normal LA pressure in regard to the deflection of the P-wave in lead Z – negative (type 1) or biphasic/positive (type 2 or type 4)
From: Orthogonal P-wave morphology is affected by intra-atrial pressures
Normal LA pressure | Markedly elevated LA pressure | Total | |
|---|---|---|---|
Type 1 (negative Z) | 14 (28%) | 11 (10%) | 25 |
Type 2 and 4 (biphasic or positive Z) | 36 (72%) | 97 (90%) | 133 |
Total | 50 | 108 | 158 |