H1N1 Influenza Causing Fulminant Myocarditis Requiring Extracorporeal Membrane Oxygenation

Area of Science:

• Cardiology
• Infectious Diseases
• Critical Care Medicine

Background:

• Influenza A (H1N1) is a significant global health concern, typically causing mild respiratory illness.
• While influenza commonly presents with upper respiratory symptoms, severe complications like myocarditis are infrequent.

Observation:

• A case of acute fulminant myocarditis is presented, initially manifesting as dyspnea.
• Diagnostic workup, including laboratory tests, chest X-ray, and echocardiogram, confirmed myocarditis.
• Nasopharyngeal testing confirmed Influenza A (H1N1) infection.

Findings:

• The patient experienced hemodynamic instability requiring vasoactive drugs and ventilatory support.
• Despite medical interventions, the patient progressed to refractory cardiogenic shock.
• This indicates a severe, atypical response to H1N1 infection.

Implications:

• This case underscores the potential for H1N1 influenza to precipitate severe cardiac complications.
• Highlights the importance of considering myocarditis in patients with influenza and unexplained hemodynamic instability.
• Emphasizes the need for prompt recognition and aggressive management of H1N1-associated myocarditis and cardiogenic shock.