Please assess the completion status of the following clinical trial:

Trial Title: Effect of Aldosterone on Energy Starvation in Heart Failure

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

Eligibility Criteria:
Inclusion Criteria:~* 18 years or older~* Nonischemic dilated cardiomyopathy~* Left ventricular ejection fraction 35% or less~* Stable heart failure symptoms~* Able to undergo both positron emission tomography and magnetic resonance imaging with gadolinium~* Able to tolerate treatment with spironolactone~Exclusion Criteria:~* Serum potassium \>5.0~* Serum creatinine \>2.5~* Contraindications to magnetic resonance imaging such as internal cardioverter-defibrillator.

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

Study Arms:
- Results with spironolactone (Type: EXPERIMENTAL): patients with heart failure due to nonischemic dilated cardiomyopathy will be studied by 11C acetate positron emission tomography and magnetic resonance imaging using vasodilator and gadolinium to judge myocardial blood flow, before and after 6 months' treatment with spironolactone.

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