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Objective To study the effects of ephedrine and phenylepbedrine for maintenance of arterial pressure during combined spinai/epidural anesthesia (CSEA) for caesarean section. Methods Forty patients, ASA grade Ⅰ - Ⅱ, who were scheduled for caesarean section by CSEA were randomly divided into two groups, when patients were hypotension, phenylephedrine 100 μg (group P, 20 cases ) or ephedrine 10 mg (group E, 20 cases). The variety of blood pressure (Bp), heart rate (HR) and oxyhemoglobin saturation (SpO2) were monitored; recorded before anesthesia (T0), at 15 min after anesthesia (T1), fetuses were taken out of uterus (T2) and at the end of operation (T3); umbilical arterial blood gas analysis was monitored; neonatal Apgar score was investigated. Results Umbilical arterial blood gas analysis of pH,PaO2, PaCO2, HCO3-, SaO2 were normal in two groups, there were no significant difference in PaO2, PaCO2 and SaO2 between two groups, but pH and HCO3- in group P were higher than those in group E [7.38±0.07 vs7.30±0.02 and (21.5±3.4) mmol/L vs (19.3±3.3) mmol/L] (P <0.05). There were no significant difference in Apgar score and Bp between two groups. Compared with group P, the HR in group E was increased obviously at T1 and T2 (P < 0.05). Conclusion Phenylephedrine is the vasopresser that most closely meets the criteria for the best vasopressor to use in obstetric patients.
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0.05).Traction reactions,the use of sedative and centrally acting anesthesia drugs during the operation were significantly less in group AEA than those in group EA(P