Please assess the completion status of the following clinical trial:

Trial Title: Prevention and Treatment of Immersion Pulmonary Edema

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: NONE
- Phase: EARLY_PHASE1
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* History of immersion pulmonary edema~Exclusion Criteria:~* Coronary artery disease, cardiomyopathy, heart valve disease

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 55 Years
- Healthy Volunteers: t

Study Arms:
- Sildenafil (Type: EXPERIMENTAL): Measurements of pulmonary and systemic pressures during cold water immersion before and after sildenafil 50 mg orally.

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