Hello. This is in regards to the CPAP machine that I have been using faithfully for at least 3 years. My question is can it cause dizziness, some breathlessness and mild palpitations. Recently I had a nuclear stress test after experiencing dizziness and some palpitations while walking outdoors. The test revealed unequivocally that there was narrowing in one of the veins. That I may have small vessel disease. My heart doctor one of the best if not the best in the state disagreed with these findings.