title: Sildenafil improves hemodynamic parameters in COPD--an investigation of six patients.
abstract: Pulmonary hypertension (PH) is an important predictor of mortality in chronic obstructive pulmonary disease (COPD). The phosphodiesterase 5 inhibitor sildenafil has been demonstrated to reduce pulmonary arterial pressure (PAP) in different diseases. We wanted to investigate the effect of sildenafil on hemodynamic parameters and the 6-min walk test (6 MWT) in six patients with severe COPD and echocardiographically estimated PH. A 6 MWT was performed and hemodynamic parameters were measured by right heart catheterization before and 1 and 12h after injection of 50mg sildenafil intravenously. A 3-months period of peroral sildenafil therapy 50mg twice daily followed and finally hemodynamic parameters and a 6 MWT were repeated. Intravenously applied sildenafil could be demonstrated to reduce PAP and pulmonary vasculature resistance (PVR) significantly. And after 3 months of oral sildenafil, the mean PAP has decreased from 30.2+/-5.5 mmHg (range: 24-39 mmHg) to 24.6+/-4.2 mmHg (range: 20-30 mmHg) (p=0.01). The PVR has decreased from 401+/-108 dyn s cm(-5) (range: 266-558 dyn s cm(-5)) to 264+/-52 dyn s cm(-5) (range: 204-333 dyn s cm(-5)) (p<0.05). Physical conditions improved: the 6-min walk distance increased from 351+/-49 to 433+/-52 m. In conclusion, in six patients suffering from severe COPD we could demonstrate significantly improved hemodynamic parameters after 50 mg sildenafil intravenous application. And after 3 months of oral sildenafil, walking distance in the 6 MWT increased significantly as well as hemodynamic parameters in the five patients who had accepted a second right heart catheterization.
authors.affiliation: Department of Internal Medicine 1, St Josef Hospital, University Hospital of the Ruhr-Universität Bochum, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Alp
authors.forename: M
authors.initials: M
authors.lastname: Skrygan
authors.forename: W E
authors.initials: WE
authors.lastname: Schmidt
authors.forename: A
authors.initials: A
authors.lastname: Bastian
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D006328:Cardiac Catheterization; D005080:Exercise Test; D005260:Female; D005541:Forced Expiratory Volume / Q000502:physiology; D006439:Hemodynamics / Q000187:drug effects / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010726:Phosphodiesterase Inhibitors / Q000009:adverse effects / Q000627:therapeutic use*; D010879:Piperazines / Q000009:adverse effects / Q000627:therapeutic use*; D011652:Pulmonary Circulation / Q000187:drug effects; D029424:Pulmonary Disease, Chronic Obstructive / Q000188:drug therapy* / Q000503:physiopathology; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones; D014655:Vascular Resistance / Q000187:drug effects; D016138:Walking / Q000502:physiology
chemical_list: D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate