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Context: The association between atrial fibrillation and stroke is well-known by use of the CHA2DS2VASc risk assessment. However, little is known about the thromboembolic risk in patients who have isolated systolic heart failure (HF) with sinus rhythm. Despite growing literature which shows how HF in the setting of normal sinus rhythm is a risk factor for thromboembolic disease, the recommendation for use of anticoagulation, whether warfarin or direct oral anticoagulation (DOAC) in this setting, is not yet reflected in cardiology guidelines. To reduce the risk of thromboembolism, anticoagulation trials have been done but have not conclusively shown benefit over risk. We present a case of left middle cerebral artery (MCA) stroke after de novo HF in a patient with sinus rhythm, who was previously not on anticoagulation. Case: A 57-year-old male presented to our hospital with worsening shortness of breath for 3 days. He had signs of hypervolemia consistent with an acute heart failure exacerbation. Pertinent physical exam findings included lower extremity edema, rales, and jugular venous distension. He also had fatigue and exertional dyspnea. During his hospital course, he underwent imaging studies that revealed cardiomegaly, absence of pulmonary embolism, and a severely reduced ejection fraction. During his acute heart failure admission, he developed a left MCA stroke suspected to be of cardioembolic etiology and was successfully treated with tissue plasminogen activator (tPA). Conclusion: According to the most recent AHA/ACC cardiovascular disease guidelines, anticoagulation is not indicated in systolic heart failure patients with sinus rhythm. However, our case is rare because the patient had no underlying risk factors for thromboembolism and significant past medical history. He developed new-onset nonischemic cardiomyopathy complicated by a stroke. Therefore, we suggest the need for prophylactic anticoagulation should be assessed on an individual basis, with the assistance of shared decision making, especially when the ejection fraction is acutely and severely reduced.
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