Influenza B Viral Infection Complicated by Acute Fulminant Myocarditis Requiring Mechanical Support: A Case Report

Acute fulminant myocarditis represents a severe complication of myocarditis, necessitating early suspicion and intervention for improved patient outcomes. Influenza B-induced myocarditis remains a relatively rare entity. A young lady presented to the emergency department with symptoms of heart failure and cardiogenic shock, requiring inotropes without significant improvement. For the continued deterioration of her hemodynamics, she underwent mechanical circulatory support, including Extracorporeal Membrane Oxygenation (ECMO) and Intra-aortic balloon pump (IABP). The follow-up investigations showed positive influenza B. She was treated with antiviral therapy and steroids, resulting in gradual improvement in hemodynamics and left ventricular ejection fraction.