<prompt> Answer this question truthfullyWhat is the connection between obstructive sleep apnea and congestive heart failure?  <response>: <reason> Clinical practice guidelines by the United States Preventive Services Task Force and the American Academy of Sleep Medicine address screening and diagnosis.Sleep apnea is defined as partial or complete cessation of breathing during night-time sleep, resulting in repeated arousal from sleep, oxyhemoglobin desaturation, and daytime sleepiness. Apnea is as complete cessation of airflow for 10 s. Hypopnea, or partial cessation of airflow, is defined as a 50 to 90 reduction in airflow for 10 s, and 3 decrease in oxyhemoglobin saturation SaO2 terminated by arousal. The 3 types of apnea include central, obstructive, and mixed. Central sleep apnea CSA is characterized by a complete withdrawal of central respiratory drive to the inspiratory muscles, including the diaphragm, and results in the simultaneous absence of naso-oral airflow and thoracoabdominal excursions. In obstructive sleep apnea OSA, the thoracic inspiratory muscles, including the diaphragm, are active, so thoracoabdominal excursions are seen. Absence of airflow results from upper-airway occlusion caused by lost pharyngeal dilator muscle tone, with consequent pharyngeal collapse. Obstructive sleep apnea is classified as mild apnea-hypopnea index or AHI, 514, moderate AHI, 1530, or severe AHI, 30 Mixed apnea has an initial central component followed by an obstructive component. Two types of hypopnea include obstructive or central. 