## **Core Concept**
The patient presents with symptoms of heart failure, as indicated by progressive shortness of breath, and has a history of type II diabetes mellitus, a risk factor for cardiovascular disease. The echocardiogram findings of reduced ejection fraction (EF of 25%) and wall motion defects are consistent with heart failure with reduced ejection fraction (HFrEF), likely post-myocardial infarction given the wall motion defects.

## **Why the Correct Answer is Right**
The patient is stabilized on optimal medical therapy for heart failure, including furosemide (a loop diuretic), spironolactone (an aldosterone antagonist), bisoprolol (a beta-blocker), and ramipril (an ACE inhibitor). The next step in the management of heart failure, particularly in a patient with a reduced ejection fraction and potential coronary artery disease (given the history and wall motion defects), would involve investigating the cause of the reduced ejection fraction and assessing for coronary artery disease. A **coronary angiogram** is crucial for diagnosing coronary artery disease and guiding potential revascularization strategies, which can be beneficial in patients with heart failure and significant coronary artery disease.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While a chest X-ray can provide information on cardiac size and pulmonary congestion, it does not directly address the cause of the patient's heart failure or potential coronary artery disease.
- **Option B:** A complete blood count (CBC) can help identify anemia or infection but does not directly address the cardiac dysfunction or potential causes like coronary artery disease.
- **Option C:** Although cardiac MRI can provide detailed images of the heart and help assess ejection fraction, viability, and fibrosis, it is not typically the immediate next step after stabilization in a patient with suspected coronary artery disease as the primary concern.

## **Clinical Pearl / High-Yield Fact**
In patients with heart failure and reduced ejection fraction, especially with a history suggestive of coronary artery disease (like wall motion defects), **coronary angiography** is a critical investigation to guide management, including potential revascularization, which can improve outcomes.

## **Correct Answer:** . **Coronary Angiogram**