title: Human umbilical vessel diameters and bloodgas tensions in the first two minutes after delivery.
abstract: Human umbilical vein and artery diameters reduce significantly during the first 2 min after delivery, whereas blood gas tensions do not change significantly. Gas tension changes, therefore, cannot account for the reduction in the umbilical vessel diameters which occurs during this time.
mesh_terms: D002245:Carbon Dioxide / Q000097:blood*; D036861:Delivery, Obstetric; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D010100:Oxygen / Q000097:blood*; D010313:Partial Pressure; D011175:Positive-Pressure Respiration; D011247:Pregnancy; D013997:Time Factors; D014469:Umbilical Arteries / Q000033:anatomy & histology*; D014471:Umbilical Veins / Q000033:anatomy & histology*; D014666:Vasomotor System / Q000502:physiology
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen