Fatal Influenza B Myocarditis in a 34-Year-Old Female

Area of Science:

• Cardiology
• Infectious Diseases
• Virology

Background:

• Influenza B virus is a common respiratory pathogen.
• Myocarditis, inflammation of the heart muscle, can be a rare complication of viral infections.
• Accurate and timely diagnosis of viral myocarditis is crucial for patient outcomes.

Observation:

• A 34-year-old female presented with epigastric pain and was initially negative for influenza A and B via rapid screening.
• Despite negative initial tests, the patient rapidly deteriorated, developing myocarditis, pulseless ventricular tachycardia, and succumbing within 24 hours.
• Postmortem analysis confirmed influenza B infection via viral smear.

Findings:

• Rapid influenza diagnostic tests may fail to detect influenza B infection, even in severe cases.
• Influenza B can cause severe and rapidly progressive myocarditis in adults, leading to fatal cardiac events.
• The clinical presentation of influenza B can be atypical in adults, mimicking other conditions.

Implications:

• There is a critical need for enhanced diagnostic methods for influenza B, particularly in cases of suspected viral myocarditis.
• New treatment strategies are required to manage severe influenza-induced myocarditis in adults.
• Physicians should maintain a high index of suspicion for influenza B as a cause of myocarditis in adults, even with negative rapid tests.