ll leave the technicalities to someone else, but in general untreated apnea is not good for the heart, or any other part of your body. Whoever provided your
cpap equipment should see you through whatever it takes to be successful if you keep going back to them. There are web sites dedicated to helping others with adjusting to cpap. Just sounds like your heart doesn't need the stress of sleep apnea, whether it is causing the problems or not.