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HR (beat/min), MAP (mmHg), SVRI (dynes.cm-5.m-2), PVRI (dynes. cm-5.m-2) in both groups. † P <0.05 within the CPAP group, ‡ P <0.05 within the extended sigh group, * P <0.05 between both groups. CPAP=continuous positive airway pressure, HR=heart rate, MAP=mean arterial pressure, SVRI=systemic vascular resistance index, PVRI=pulmonary vascular resistance index
