Fig. 1From: Orthogonal P-wave morphology is affected by intra-atrial pressuresType 1: predominantly positive leads X and Y and predominantly negative lead Z, type 2: predominantly positive leads X and Y and biphasic lead Z (negative, positive), type 3: predominantly positive lead X and biphasic leads Y (positive, negative) and Z (negative, positive) and type 4 (positive in all three leads)Back to article page