Please assess the completion status of the following clinical trial:

Trial Title: Chronic Sildenafil Treatment in Heart Failure

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* consent to participate in the study after detailed information about procedures, possible clinical benefits and risks;~* negative exercise stress test prior to study initiation;~* forced expiratory volume in 1 sec/forced vital capacity ratio\>70%;~* left ventricular ejection fraction \< 45%, determined by echocardiography.~Exclusion Criteria:~* subjects unable to complete a maximal exercise test~* systolic blood pressure \> 140 and \<110 mmHg~* diabetes mellitus~* therapy with nitrate preparations~* history of sildenafil intolerance~* significant lung or valvular diseases~* neuromuscular disorders, claudication~* peripheral vascular disease

- Gender: MALE
- Minimum Age: 38 Years
- Maximum Age: 80 Years
- Healthy Volunteers: f

Study Arms:
- sildenafil (Type: ACTIVE_COMPARATOR): sildenafil 50 mg three times/day
- Placebo (Type: PLACEBO_COMPARATOR): Placebo

Based on this trial design, predict the completion outcome and termination type (if applicable).