I was newly diagnosed with "mild PH" due to sleep apnea. Systolic pressure, measured by right heart cath, was 55 while mean was 33. I reacted well to nitric oxide during the cath., with mean pressure going down to 26 (systolic went down to 40, I believe).
I have "mild" sleep apnea, based on sleep study, but also showed desaturation down to 79% at its worst, and have just been put on CPAP machine.