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.
Migraine and cluster headaches are severe and disabling. Hyperbaric oxygen therapy (HBOT, that is the breathing of pure oxygen at pressures greater than one atmosphere in a pressurised chamber) and normal pressure oxygen therapy (NBOT) can be delivered via a mask at home or in a clinic. These treatments may help to end acute attacks and prevent future attacks. Results.