Table 3– Univariate analysis of risk factors for major complications after surgery in patients with pulmonary arterial hypertension

	OR (95% CI)	p-value
Age years	0.9 (0.9–1.0)	0.52
6MWD m	2.2 (1.1–3.7)	0.04
NYHA functional class	1.04 (0.5–2.0)	0.72
mRAP mmHg	1.1 (1.0–1.3)	0.01
Cardiac index L·min⁻¹·m⁻²	1.6 (0.92–4.9)	0.36
mPAP mmHg	0.97 (0.8–1.1)	0.21
PVR dyn·s·cm⁻⁵	0.91 (0.78–1.1)	0.22
S_vO₂ %	1.2 (0.9–1.3)	0.07
Surgery performed in PH centre	0.2 (0.05–1.0)	0.06
*General versus* spinal anaesthesia**	1.9 (0.3–2.7)	0.50
Use of vasopressors	1.5 (1.2–2.7)	0.03
Emergency procedure	2.4 (1.4–3.6)	0.01

6MWD: 6-min walking distance; NYHA: New York Heart Association; mRAP: mean right artery pressure; mPAP: mean pulmonary artery pressure; PVR: pulmonary vascular resistance; S_vO₂: mixed venous oxygen saturation; PH: pulmonary hypertension.