Sleep apnea leads to hypoxemia at night which leads to changes in breathing and gas exchange during the day. Treatment unravels the daytime problems but more slowly than you might think. Heavy snorers do have an increased chance of obstructive sleep apnea, but it really is heralded by the loudness, frequency and the presence of pauses. I hear rumors that there is interest now that the FDA has approved NO use in the intensive care unit. This is for Martha, who can't get back in the room.
Sleep apnea can occur in people with or without all types of lung and heart problems.
Possibly the PH came on by itself. By all accounts, the most common cause for pulmonary hypertension is beleived to be left heart failure. Inthose with PPH, there should be no evidence for left heart failure. Sure. there would be more arousals and more disturbed sleep. To get more accurate test results for having sleep apnea.