That link was to explain what it is. I didn't know I had it either until the pulmonologist found it during the period my primary care doctor was trying to find my issues. Obstructive Apnea effects high blood pressure and reduced oxygen levels and puts stress on the cardiovascular system. The pulmonologist determined that I was stopping breathing and average of 20 times and hour. Of course my primary care and the pulmonologist and local cardiologist thought that was driving my symptoms. After about 4 months, my primary care doctor understood that it wasn't the only thing going on.