title: Impact of preoperative 5α-reductase inhibitors on perioperative blood loss in patients with benign prostatic hyperplasia: a meta-analysis of randomized controlled trials.
abstract: BACKGROUND
  The ability of 5α-reductase inhibitors (5ARIs) to decrease blood loss during transurethral resection of the prostate (TURP) for benign prostatic hyperplasia (BPH) remains controversial. We aimed to conduct a meta-analysis of all randomized controlled trials (RCTs) to establish the role of 5ARI use prior to TURP.
  
  
  METHODS
  We searched studies from the electronic databases PubMed, Embase, Scopus, and Cochrane Library from inception to March 25, 2014. Meta-analysis was performed using the statistical software Review Manager version 5.1.
  
  
  RESULTS
  Seventeen RCTs including 1489 patients were examined. We observed that preoperative treatment with finasteride can decrease total blood loss, blood loss per gram of resected prostate tissue, hemoglobin level alteration, microvessel density (MVD), and vascular endothelial growth factor level. Neither finasteride nor dutasteride reduced operative time, prostate volume, or the weight of gland resected. In contrast, pretreatment with dutasteride before TURP did not decrease the total blood loss or MVD.
  
  
  CONCLUSIONS
  Pretreatment with finasteride does seem to reduce perioperative blood loss related to TURP for BPH patients. However, the effect of preoperative dutasteride was inconclusive. Further studies are required to strengthen future recommendations regarding the use of 5ARI as a standard pre-TURP treatment and its optimal regimen.
authors.affiliation: Department of Urology, Fudan University Shanghai Cancer Center, No. 270 Dong an Road, Shanghai, 200032, People's Republic of China. qdzhuyiping@gmail.com.|Department of Oncology, Shanghai Medical College, Fudan University, No. 270 Dong an Road, Shanghai, 200032, People's Republic of China. qdzhuyiping@gmail.com.
authors.forename: Yi-Ping
authors.initials: YP
authors.lastname: Zhu
authors.affiliation: Department of Urology, Fudan University Shanghai Cancer Center, No. 270 Dong an Road, Shanghai, 200032, People's Republic of China. daibo1978@163.com.|Department of Oncology, Shanghai Medical College, Fudan University, No. 270 Dong an Road, Shanghai, 200032, People's Republic of China. daibo1978@163.com.
authors.forename: Bo
authors.initials: B
authors.lastname: Dai
authors.affiliation: Department of Urology, Fudan University Shanghai Cancer Center, No. 270 Dong an Road, Shanghai, 200032, People's Republic of China. zhanghl918@sina.com.|Department of Oncology, Shanghai Medical College, Fudan University, No. 270 Dong an Road, Shanghai, 200032, People's Republic of China. zhanghl918@sina.com.
authors.forename: Hai-Liang
authors.initials: HL
authors.lastname: Zhang
authors.affiliation: Department of Urology, Fudan University Shanghai Cancer Center, No. 270 Dong an Road, Shanghai, 200032, People's Republic of China. shiguohai77@163.com.|Department of Oncology, Shanghai Medical College, Fudan University, No. 270 Dong an Road, Shanghai, 200032, People's Republic of China. shiguohai77@163.com.
authors.forename: Guo-hai
authors.initials: GH
authors.lastname: Shi
authors.affiliation: Department of Urology, Fudan University Shanghai Cancer Center, No. 270 Dong an Road, Shanghai, 200032, People's Republic of China. dwye.tumor@gmail.com.|Department of Oncology, Shanghai Medical College, Fudan University, No. 270 Dong an Road, Shanghai, 200032, People's Republic of China. dwye.tumor@gmail.com.
authors.forename: Ding-Wei
authors.initials: DW
authors.lastname: Ye
mesh_terms: D058891:5-alpha Reductase Inhibitors / Q000008:administration & dosage*; D016063:Blood Loss, Surgical / Q000517:prevention & control*; D018120:Finasteride / Q000008:administration & dosage*; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D019106:Postoperative Hemorrhage / Q000517:prevention & control; D011300:Preoperative Care / Q000379:methods; D011468:Prostatectomy / Q000009:adverse effects / Q000379:methods; D011470:Prostatic Hyperplasia / Q000473:pathology / Q000601:surgery*; D016032:Randomized Controlled Trials as Topic; D020728:Transurethral Resection of Prostate / Q000009:adverse effects / Q000379:methods*; D016896:Treatment Outcome
chemical_list: D058891:5-alpha Reductase Inhibitors; D018120:Finasteride