Please assess the completion status of the following clinical trial:

Trial Title: The Assessment of Right Ventricular Contractility in Response to Sildenafil

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE3
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* Significant pulmonary arterial hypertension (mean pulmonary artery pressure \> 25 mm Hg)~* Patients aged 4-18 years~* Routine cardiac catheterization clinically indicated for deciding therapeutic treatment~* Informed assent/consent from patient/parent~Exclusion Criteria:~* Suprasystemic pulmonary artery pressures~* Evidence of right heart failure~* History of ventricular arrhythmia~* Known vascular access arrhythmia~* Contraindication to Sildenafil~* Concurrent inotropic / PDE administration~* Other medical, psychological or social circumstances which complicate a regular participation in the study, and/or increase the risk for the patients themselves~* No consent/assent~* Pregnancy or unwillingness to comply with contraceptive advice

- Gender: ALL
- Minimum Age: 1 Year
- Maximum Age: 18 Years
- Healthy Volunteers: f

Study Arms:
- 1 (Type: EXPERIMENTAL): None

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