title: The effects of tamsulosin and sildenafil in separate and combined regimens on detailed hemodynamics in patients with benign prostatic enlargement.
abstract: OBJECTIVE
  We measured the detailed hemodynamic effects of tamsulosin and sildenafil separately and together in patients with benign prostatic enlargement.
  
  
  METHODS
  The supine effects of and responses to passive orthostasis (60 degrees for 8 minutes) were measured in 16 patients with benign prostatic enlargement with the finger blood pressure method and whole-body impedance cardiography. The medications, 100 mg sildenafil (single doses) and 0.4 mg tamsulosin (once daily for up to 14 days), were administered in a randomized, double-blind, crossover fashion.
  
  
  RESULTS
  Supine systolic arterial pressure decreased with sildenafil (mean +/- SEM -11 +/- 2 mm Hg) and sildenafil plus tamsulosin (-14 +/- 2 mm Hg) more than with placebo (-2 +/- 4 mm Hg, p <0.05). In comparison to placebo sildenafil plus tamsulosin decreased the systemic vascular resistance index (328 +/- 129 vs -241 +/- 134 dyn.sec/cm.m, p = 0.01). Tamsulosin alone did not cause any significant changes in comparison to placebo. Heart rate, diastolic arterial pressure, stroke index, cardiac index and arterial pulse wave velocity were not affected to a statistically significant degree by any of the treatments compared to placebo. Upon head-up tilt the drugs caused only 1 significant change in that diastolic arterial pressure was significantly higher (-2.7 vs -8.0 mm Hg, p = 0.04) in the placebo group than in the tamsulosin plus sildenafil group.
  
  
  CONCLUSIONS
  Tamsulosin does not disturb hemodynamics in patients with benign prostatic enlargement. Sildenafil decreases blood pressure with the patient supine but not during head-up tilt. The combination treatment also decreases the systemic vascular resistance index in the supine position.
authors.affiliation: Department of Pharmacological Sciences, Medical School, University of Tampere, Medisiinarinkatu, Tampere 33014, Finland. tuomo.nieminen@iki.fi
authors.forename: Tuomo
authors.initials: T
authors.lastname: Nieminen
authors.forename: Teuvo L J
authors.initials: TL
authors.lastname: Tammela
authors.forename: Tiit
authors.initials: T
authors.lastname: Kööbi
authors.forename: Mika
authors.initials: M
authors.lastname: Kähönen
mesh_terms: D015106:3',5'-Cyclic-GMP Phosphodiesterases / Q000037:antagonists & inhibitors*; D000317:Adrenergic alpha-Antagonists / Q000627:therapeutic use*; D000368:Aged; D000465:Algorithms; D001794:Blood Pressure / Q000187:drug effects; D002307:Cardiography, Impedance; D018592:Cross-Over Studies; D004311:Double-Blind Method; D004359:Drug Therapy, Combination; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D010879:Piperazines / Q000008:administration & dosage* / Q000627:therapeutic use; D011470:Prostatic Hyperplasia / Q000188:drug therapy* / Q000503:physiopathology*; D011687:Purines; D000068677:Sildenafil Citrate; D013449:Sulfonamides / Q000008:administration & dosage* / Q000627:therapeutic use; D013450:Sulfones; D000077409:Tamsulosin; D018667:Tilt-Table Test; D014655:Vascular Resistance / Q000187:drug effects
chemical_list: D000317:Adrenergic alpha-Antagonists; D010879:Piperazines; D011687:Purines; D013449:Sulfonamides; D013450:Sulfones; D000068677:Sildenafil Citrate; D015106:3',5'-Cyclic-GMP Phosphodiesterases; D000077409:Tamsulosin