title: Preoperative interscalene brachial plexus block aids in perioperative temperature management during arthroscopic shoulder surgery.
abstract: BACKGROUND
  Hypothermia is common during arthroscopic shoulder surgery under general anesthesia, and anesthetic-impaired thermoregulation is thought to be the major cause of hypothermia. This prospective, randomized, double-blind study was designed to compare perioperative temperature during arthroscopic shoulder surgery with interscalene brachial plexus block (IBPB) followed by general anesthesia vs. general anesthesia alone.
  
  
  METHODS
  Patients scheduled for arthroscopic shoulder surgery were randomly allocated to receive IBPB followed by general anesthesia (group GB, n = 20) or general anesthesia alone (group GO, n = 20), and intraoperative and postoperative body temperatures were measured.
  
  
  RESULTS
  The initial body temperatures were 36.5 ± 0.3℃ vs. 36.4 ± 0.4℃ in group GB vs. GO, respectively (P = 0.215). The body temperature at 120 minutes after induction of anesthesia was significantly higher in group GB than in group GO (35.8 ± 0.3℃ vs. 34.9 ± 0.3℃; P < 0.001). The body temperatures at 60 minutes after admission to the post-anesthesia care unit were 35.8 ± 0.3℃ vs. 35.2 ± 0.2℃ in group GB vs. GO, respectively (P < 0.001). The concentrations of desflurane at 0, 15, and 120 minutes after induction of anesthesia were 6.0 vs. 6.0% (P = 0.330), 5.0 ± 0.8% vs. 5.8 ± 0.4% (P = 0.001), and 3.4 ± 0.4% vs. 7.1 ± 0.9% (P < 0.001) in group GB vs. GO, respectively.
  
  
  CONCLUSIONS
  The present study demonstrated that preoperative IBPB could reduce both the intraoperative concentration of desflurane and the reduction in body temperature during and after arthroscopic shoulder surgery.
authors.affiliation: Department of Anesthesiology and Pain Medicine, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
authors.forename: Se Hun
authors.initials: SH
authors.lastname: Lim
authors.affiliation: Department of Anesthesiology and Pain Medicine, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
authors.forename: Wonjin
authors.initials: W
authors.lastname: Lee
authors.affiliation: Department of Anesthesiology and Pain Medicine, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
authors.forename: JaeGwan
authors.initials: J
authors.lastname: Park
authors.affiliation: Department of Anesthesiology and Pain Medicine, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
authors.forename: Myoung-Hun
authors.initials: MH
authors.lastname: Kim
authors.affiliation: Department of Anesthesiology and Pain Medicine, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
authors.forename: Kwangrae
authors.initials: K
authors.lastname: Cho
authors.affiliation: Department of Anesthesiology and Pain Medicine, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
authors.forename: Jeong Han
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Anesthesiology and Pain Medicine, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
authors.forename: Soon Ho
authors.initials: SH
authors.lastname: Cheong
authors.affiliation: Department of Anesthesiology and Pain Medicine, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
authors.forename: Kun Moo
authors.initials: KM
authors.lastname: Lee
keywords: Arthroscopy; Brachial plexus block; General anesthesia; Shoulder; Temperature