Objective To explore the efficacy and safety of sodium nilroprusside(SNP) with remifentanil or fentanyl used for controlled hypotension during the pediatric patent ductus arteriosus (PDA) operations.

• 目的探讨硝普钠(SNP)复合芬太尼或瑞芬太尼在动脉导管未闭(PDA)手术中行控制性降压麻醉的有效性和安全性。