title: Resting oxygen consumption in patients with twin pregnancy.
abstract: OBJECTIVE
  This study examined the resting oxygen consumption in patients with a twin pregnancy and compared the results with those of singleton pregnancies.
  
  
  METHODS
  In 15 patients with a twin and 26 patients with a singleton pregnancy, the resting oxygen consumption was measured using an open-circuit ventilatory system during the third trimester of pregnancy.
  
  
  RESULTS
  The average resting oxygen consumption in patients with a twin pregnancy was 231+/-25 ml/min, significantly higher than that in patients with a singleton pregnancy (209+/-24 ml/min, P<0.05).
  
  
  CONCLUSIONS
  Our results indicate an estimated increase in metabolic rate in patients during the third trimester of a twin pregnancy compared with those with a singleton pregnancy.
authors.affiliation: Department of Obstetrics and Gynecology, Tokyo Rinkai Hospital, 1-4-2 Rinkai-cho, Edogawa-ku, Tokyo, 134-0086, Japan. czg83542@mopera.ne.jp
authors.forename: Shunji
authors.initials: S
authors.lastname: Suzuki
authors.forename: Shino
authors.initials: S
authors.lastname: Shinagawa
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Chihara
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Otsubo
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Takeuchi
authors.forename: Rintaro
authors.initials: R
authors.lastname: Sawa
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Yoneyama
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Takeshita
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Araki
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D010100:Oxygen / Q000032:analysis*; D010101:Oxygen Consumption / Q000502:physiology*; D011247:Pregnancy; D011263:Pregnancy Trimester, Third / Q000502:physiology; D011272:Pregnancy, Multiple / Q000502:physiology*; D012146:Rest; D014427:Twins
chemical_list: D010100:Oxygen