Here are results from two European studies that suggest that treating obstructive sleep apnea with CPAP may prevent the onset of high blood pressure. One observational study showed that having normotensive patients with sleep apnea at baseline had a 29% lower risk of developing hypertension if they used CPAP after 12 years. Another randomized study showed an effect on preventing hypertension, but did not reach statistical significance.
It’s difficult to interpret these results since no single study in particular will state flat out that CPAP prevents new onset hypertension. You have to look at multiple similar studies and conclude that statistically, you have a higher chance of having lower blood pressure the longer you use CPAP. The second study had much smaller subject numbers and since the effect size is so small to begin with, you’d have to have a much larger groups of subjects to see any statistically significant effect of CPAP therapy.
Anecdotally, I’ve had numerous patients that reported normalization of blood pressure (wether high or low) after surgical treatment for their obstructive sleep apnea.
Did your blood pressure come down after you started using CPAP, dental appliances, or underwent surgery?