Mean pulmonary arterial systolic pressure (PASP) with 95% CI error bars and individual data points at rest breathing room air (baseline), during 20 min breathing 15.1% O2 at rest (hypoxia rest) and following mild exercise (hypoxia exercise) in 14 patients w... Mean pulmonary arterial systolic pressure (PASP) with 95% CI error bars and individual data points at rest breathing room air (baseline), during 20 min breathing 15.1% O2 at rest (hypoxia rest) and following mild exercise (hypoxia exercise) in 14 patients with pulmonary arterial hypertension (PAH) and 7 healthy patients (control). *p<0.01 ANOVA, †Vs Control p<0.01, unpaired t-test. N=11 PAH hypoxia during exercise. ANOVA, analysis of variance; PAH, pulmonary arterial hypertension. Leigh M Seccombe et al. Open Heart 2017;4:e000532 ©2017 by British Cardiovascular Society