People with heart disease commonly complain about day time sleepiness, which is also a common symptom of Obstructive Sleep Apnea (OSA). A study of 87 people who were suspected of having OSA, were subject to a sleep study and investigation of their cardiac-output. It was revealed that OSA patient with daytime sleepiness were more likely to have heart disease and the degree of sleepiness was correlated with cardiac impact. These results suggest that apart from sleepiness caused by OSA, additional fatigue may result from heart disease in OSA patients.
SLEEP vol 32(7)-wed July 01.2009