amnion. the innermost fetal membrane, which forms a sac filled with amniotic fluid that surrounds the embryo and later the fetus; as it enlarges it gradually obliterates the chorionic cavity and enfolds the umbilical cord. Called also bag of waters.
cluster breathing. cluster breathing. a breathing pattern in which a closely grouped series of respirations is followed by apnea. The activity is associated with a lesion in the lower pontine region of the brainstem. See also Biot's respiration, Cheyne-Stokes respiration.
What is Adaptive Servo Ventilation (ASV)? Adaptive Servo Ventilation (ASV) â is a medical technology that utilizes positive airway pressure ventilatory support that is adjusted based on the detection of apneas, or pauses in breathing, during sleep. It is primarily used in the treatment of Central Sleep Apnea. It is also used for complex sleep apnea, mixed sleep apnea, periodic breathing â Cheyne â Stokes respirations. The device resembles CPAP machines (Continuous Positive Airway Pressure) and uses the same masks, hoses, and attachments.