title: Preoperative steroid therapy stabilizes postoperative respiratory conditions in myasthenia gravis.
abstract: OBJECTIVE
  We reviewed our experience from 1990 to 2005 to examine whether control of myasthenia gravis (MG) with steroid therapy before surgery could stabilize postoperative respiratory conditions, compared with the nonsteroid treatment.
  
  
  METHODS
  Records of 43 consecutive patients with MG who underwent extended thymectomy at Kansai Medical University Hospital were retrospectively reviewed. Two groups, a steroid group (n = 28) and a nonsteroid group (n = 15) were compared.
  
  
  RESULTS
  In the steroid group, steroid doses ranged from 10 to 100 mg every other day, or 40-60 mg daily. The patients showed significantly less thymus hyperplasia in the pathological findings (P = 0.023). Whereas 3 of 28 (7%) in the steroid group suffered respiratory insufficiency within 3 days of surgery, 5 of 15 (33%) in the nonsteroid group exhibited the same problem (P = 0.030). Univariate analysis showed that steroid treatment was the only significant factor (P = 0.041) affecting respiratory insufficiency. Patients in the steroid group achieved palliation of MG more quickly after surgery than patients in the nonsteroid group (86% vs. 57% within 6 months, P = 0.059; 84% vs. 42% within 1 year, P = 0.042).
  
  
  CONCLUSIONS
  The control of myasthenia gravis with steroid therapy before surgery seems to stabilize postoperative respiratory status without having adverse effects on surgical infection.
authors.affiliation: Department of Thoracic and Cardiovascular Surgery, Kansai Medical University Hirakata Hospital, 2-3-1 Shinmachi, Hirakata, Osaka, 573-1191, Japan. kanedah@hirakata.kmu.ac.jp
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kaneda
authors.forename: Yukihito
authors.initials: Y
authors.lastname: Saito
authors.forename: Tomohito
authors.initials: T
authors.lastname: Saito
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Maniwa
authors.forename: Ken-Ichiro
authors.initials: K
authors.lastname: Minami
authors.forename: Hirohumi
authors.initials: H
authors.lastname: Kusaka
authors.forename: Hiroji
authors.initials: H
authors.lastname: Imamura
mesh_terms: D000328:Adult; D000368:Aged; D000549:Ambenonium Chloride / Q000627:therapeutic use; D002800:Cholinesterase Inhibitors / Q000627:therapeutic use; D003131:Combined Modality Therapy; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009157:Myasthenia Gravis / Q000188:drug therapy* / Q000517:prevention & control / Q000601:surgery*; D011239:Prednisolone / Q000008:administration & dosage*; D011300:Preoperative Care; D012131:Respiratory Insufficiency / Q000517:prevention & control*; D012189:Retrospective Studies; D013934:Thymectomy
chemical_list: D002800:Cholinesterase Inhibitors; D000549:Ambenonium Chloride; D011239:Prednisolone