The combination can increase risk of heart attack. This seemed strange to me, though:
Patients with severe obstructive sleep apnea had blood pressure readings 5.72 mmHg higher than those with normal obstructive sleep apnea.
That seems to be like a trivial increase if one has hypertension. It would be about three percent of my systolic.
I have both high blood pressure and sleep apnea. My cardiologist said that just using my CPAP should bring my blood pressure down to where I didn’t need meds. It didn’t have any effect whatsoever. Escaping the FAA brought my blood pressure to controllable levels – it had consistently been 160+/110+ while I was at work, with the maximum load of blood pressure meds a human could take.
After a couple of years using the CPAP, my blood pressure did go down quite a bit. Still need some meds, but nothing like I was taking.