ABSTRACT
Objective The purpose of this study was to examine the effect of preoperative glucose infusion on glucose transport-4 mRNA ( Glut-4 mRNA) expression in skeletal muscle before and after thoracic operation. Methods Twelve male ASA Ⅰ - Ⅱ patients undergoing elective radical surgery for esophagus cancer were randomly divided into 2 groups : (Ⅰ ) control group; (Ⅱ) glucose infusion group. Patients with hypertension, hyperlipidemia or diabetes mellitus were excluded. The patients in both groups were premedicated with phenobarbitol and atropine. Anesthesia was induced with midazolam 0.1 mg ? kg-1 , propofol 1.5 mg ?kg-1 , fentanyl 4?g?kg-1 and vecuronium 0.15 mg?kg-1 . The patients were mechanically ventilated after trachea! intubatioa Anesthesia was maintained with continuous iv infusion of propofol (80?g ? kg-1? min-1 ) and vecuronium (1.0 ?g?kg-1?min-1) supplemented with droperidol 0.1 mg?kg-1 and fentanyl 6 ?g ?kg-1 given in several boluses. In group Ⅱ 5 % glucose (0.25 g?kg-1) was infused 2 h before operation. Blood samples and 1 g of skeletal muscle were obtained while chest was being opened and closed for determination of plasma glucose and insulin levels and Glut-4 mRNA expression in muscle. The total RNA of the muscle cells was extracted by trizol one-step template. The Glut-4 mRNA amplification products were determined using RT-PCR with ?-action mRNA as an internal control. The Glut-4 mRNA expression was expressed by desired gene/ ?-action? 100% .Results Glut-4 mRNA expression was significantly decreased ( P