Effect of Vardenafil on Erectile Dysfunction and Portal Hemodynamics in Patients With Liver Cirrhosis

2 Phase 2 arm study Phase A: Baseline HVPG (Hepatic Venous Pressure Measurement) measurement, followed by 1 capsule of 10mg Vardenafil or Placebo (randomization 1:1) daily per oral for 7 days, HVPG measurement at day 7 Phase B: 1 capsule of 10mg Vardenafil or Placebo (randomization 1:1) ad libidum per oral for 28 days