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Canadian Journal of Anesthesia, Vol 33, 583-587, Copyright © 1986 by Canadian Anesthesiologists' Society

Flow Requirements for the Bain Breathing Circuit During Anaesthesia for Caesarean Section

H.S. L. MOSELEY FFARCS1, K. BHAVANI SHANKAR MBBS MD1, and A. KRISHNAN MBBS DA1

1 Department of Anaesthesia and Intensive Care, University of West Indies, Queen Elizabeth Hospital, Barbados

correspondence should be addressed to Dr. Moseley.

We studied the relationship between arterial carbon dioxide tension (PaCO2) and fresh gas flow (FGF) during use of the Bain breathing circuit for Caesarean section anaesthesia. Thirty-one patients undergoing Caesarean section were anaesthetised using the Bain circuit with intermittent positive pressure ventilation. The PaCO2 were measured at FGF of 70 ml·kg-1·min-1, 80 ml·kg-1·-1, and 100 ml·kg-1·-1. The FGF requirement to maintain a given PaCO2 during Caesarean section anaesthesia is the same as the requirements for nonpregnant subjects, despite the increase in carbon dioxide production associated with pregnancy. This is probably because the total FGF determined by body weight and given during Caesarean section anaesthesia is 15-20 per cent higher than nonpregnant levels, due to the weight gain associated with pregnancy. A FGF of 100 ml·kg-1 of pregnant weight/min maintains PaCO2 of 4.44 kPa predelivery, which is in the desirable range of PaCO2 during Caesarean section.

Key Words: ANAESTHESIA: obstetrics • EQUIPMENT: Bain breathing circuit • MEASUREMENT: arterial carbon dioxide tension






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Copyright © 1986 by the Canadian Anesthesiologists' Society.