Someone put a post on this forum I read a couple months ago describing how nocturia is triggered by OSA but I can't find it now. It had something to do with fight or flight and blood flow rushes out of the heart when one stops breathing then rushes back to the heart when one starts breathing again and it triggers a hormone that tells the kidney there is an overload of fluid in the body and the bladder fills. That may not be the exact description but as best as I can remember. When I was talking with the sleep doctor last week he described it similarly when I told him how amazed I was that I no longer had the problem in the night.
I have gone to the bathroom frequently in the night for the last several years. Sometimes as many as 4 and 5 times but always at least once and more likely twice a night. I never knew about nocturia associated with OSA before reading it on this forum. I assumed I was developing a weak bladder as my Mom has a very weak bladder. Since beginning CPAP almost 2 months ago, nocturia is 100% reversed for me. I don't get up at all. Also I go far less during the daytime. I would say that is the most significant change for me so far with CPAP.
Thanks Zonk for finding that post. I looked and couldn't find it!
During an apnea event, the heart rate and stroke volume increases, along with blood pressure, to try to keep the body oxygenated. Increased BP increases the pressure gradient in the nephron of the kidney pushing fluid out. Also, the renin-angiotensin-aldosterone system is up-regulated.
INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
I had not seen the link between the two till now. I just thought I was waking up so my body told me to get up and go. Now with my machine I've only got up once in a month. Needless to say when I do get up in the morning I have to go.