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Study Objective: To determine whether vasodilators such as sodium nitroprusside (SNP) and trimethaphan (TMP) produce a pressure difference between the radial artery and the brachial artery during epidural plus general anesthesia or simple general anesthesia.Design: Randomized study and prospective study.Setting: Operating rooms of two hospitals.Patients: 36 and 6 adult patients in the first and second...
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