title: [Changes in serum Na+ and blood hemoglobin levels during three types of transurethral procedures for the treatment of benign prostatic hypertrophy].
abstract: BACKGROUND
  Transurethral holmium YAG laser resection of the prostate (HoLR-P) and transurethral electrovaporization of the prostate (TUV-P) have recently received increasing attention as an effective minimally invasive approach for the treatment of prostatic hypertrophy. However, less information is available regarding the intraoperative changes in the serum Na+ and blood hemoglobin levels during either HoLR-P or TUV-P.
  
  
  METHODS
  Intraoperative changes in serum Na+ and blood hemoglobin levels were investigated in 17 patients undergoing transurethral resection of the prostate (TUR-P, n = 7), HoLR-P (n = 7) or TUV-P (n = 3). The 3% D-sorbitol solution was used as the irrigating fluid in all the patients.
  
  
  RESULTS
  In three patients, severe hyponatremia (118-123 mEq x l(-1)) developed abruptly (< or = 15 min) at various time points during TUR-P with (n = 1) or without (n = 2) cystostomy. However, no clinical symptoms were observed after development of the hyponatremia in those awake patients. No large (> 10 mEq x l(-1)) decreases in the Na+ level were observed in any of the patients undergoing HoLR-P or TUV-P. In patients undergoing TUR-P and HoLR-P, percent changes in serum Na+ level significantly correlated with those in blood hemoglobin level, but not with the resection time; the slopes were significantly larger than unity.
  
  
  CONCLUSIONS
  The TUR syndrome is less likely to occur during HoLR-P or TUV-P. During TUR-P, the onset of severe hyponatremia appears to be unpredictable, and may not necessarily be accompanied by clinical symptoms. Frequent measurements of the serum Na+ level appear essential for early detection of severe hyponatremia.
authors.affiliation: Department of Anesthesiology and Critical Care Medicine, Kyushu University Hospital, Faculty of Medicine, Kyushu University, Fukuoka 812-8582.
authors.forename: Takashi
authors.initials: T
authors.lastname: Akata
authors.forename: Hayashi
authors.initials: H
authors.lastname: Yoshimura
authors.forename: Yuko
authors.initials: Y
authors.lastname: Matsumae
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Shiokawa
authors.forename: Tomoko
authors.initials: T
authors.lastname: Fukumoto
authors.forename: Tadashi
authors.initials: T
authors.lastname: Kandabashi
authors.forename: Taiki
authors.initials: T
authors.lastname: Yamaji
authors.forename: Shosuke
authors.initials: S
authors.lastname: Takahashi
mesh_terms: D000368:Aged; D004564:Electrocoagulation / Q000379:methods; D004598:Electrosurgery / Q000379:methods; D006454:Hemoglobins / Q000378:metabolism*; D006801:Humans; D007010:Hyponatremia / Q000175:diagnosis / Q000517:prevention & control; D053685:Laser Therapy / Q000379:methods; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative; D011183:Postoperative Complications / Q000175:diagnosis / Q000517:prevention & control; D011470:Prostatic Hyperplasia / Q000601:surgery*; D012964:Sodium / Q000097:blood*; D013012:Sorbitol; D020728:Transurethral Resection of Prostate / Q000379:methods*
chemical_list: D006454:Hemoglobins; D013012:Sorbitol; D012964:Sodium