Orthogonal P-wave morphology is affected by intra-atrial pressures

Table 4 Patients with normal left atrial size (LA area/BSA ≤ 11.8 cm²/m²). Only P-wave morphologies 1 and 2

		Markedly elevated intra-atrial pressure
	All (n = 34)	Left (n = 7)	Right (n = 27)
Type 1	11 (32%)	0	11 (41%)
Type 2	23 (68%)	7 (100%)	16 (59%)

P = 0.04 (Pearson’s chi-squared test). LA Left atrial, BSA Body surface area. Isolated increased pressure in the left atrium was associated with P-wave morphology type 2 also when the left atrial size was normal

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