Please assess the completion status of the following clinical trial:

Trial Title: Acute Hemodynamic Effects of Sildenafil in Patients With Severe Aortic Stenosis

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE4
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* Severe aortic stenosis (AVA \< 1.0 cm2)~* Referred for a clinically ordered right and left heart catheterization~* 18 years of age and older~* Able and willing to comply with all requirements of the study~Exclusion Criteria:~* Nitrate use within 24 hours~* SBP \< 110 mmHg or MAP \< 75 mmHg~* Severe mitral regurgitation~* Severe aortic regurgitation~* Increased risk of priapism~* Retinal or optic nerve problems or unexplained visual disturbance~* Alpha antagonists or cytochrome P450 3A4 inhibitors use within 24 hours~* Current or recent (≤ 30 days) acute coronary syndrome~* O2 sat \< 90% on room air~* Females that are pregnant or believe they may be pregnant~* Any condition which the PI determines will place the subject at increased risk or is likely to yield unreliable hemodynamic data~* Unwilling to provide informed consent

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Sildenafil 40mg or 80mg (Type: EXPERIMENTAL): A single oral dose of Sildenafil (either 40mg or 80mg) will be administered to a participant after baseline hemodynamics are measured in the catheterization lab. Each dose will be equally distributed among those with preserved (≥50%) and reduced (\<50%) EF.

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