Abstract 9812: Abracadabra Alakazam: Sudden Invasion of the Pericardium by Haemophilus Influenzae

Abstract

A 25 year old man presented with three days of cough, shortness of breath, and pleuritic chest pain. Initial vital signs in the ED were normal, and exam demonstrated tonsillar erythema without exudate. Labs revealed a leukocytosis of 18.9k/μL, D-dimer of 690 ng/mL, C-reactive protein of 5.7 mg/dL, and lactate elevated to 2.9 mmol/L. High-sensitivity troponin, NT-proBNP, and SARS-CoV-2 RT-PCR were all negative. Presenting electrocardiogram demonstrated PR elevation in aVR with diffuse ST-segment elevation in the inferior and anterolateral leads. Point-of-care echocardiogram demonstrated normal biventricular function without pericardial effusion. CTPA was negative for pulmonary embolism, and he was observed for presumed acute viral pericarditis. Fourteen-hours later, he became febrile to 38.3°C, tachycardic to 133 bpm, and hypotensive to 97/65 mmHg with diffuse abdominal pain. Repeat lactate was 9.0 mmol/L. This prompted an emergent CT scan which now showed a new large pericardial effusion and bilateral pleural effusions ( Panel A ). Repeat echocardiogram confirmed a large circumferential pericardial effusion with early signs of tamponade including right atrial inversion in late diastole ( Panel B ). Emergent pericardiocentesis yielded 560 mL of brown, purulent fluid ( Panel C ) with immediate improvement in hemodynamics. Bacterial gram stain and culture grew Haemophilus influenzae ( Panel D ). Immunodeficiency screening was negative. Transient severe biventricular systolic dysfunction was noted, consistent with sepsis-induced cardiomyopathy. He completed a targeted antibiotic course with partial recovery of his ejection fraction by discharge. Purulent pericarditis is rare in developed countries, and invasive H. influenzae in a young, immunocompetent adult is particularly unusual. This case illustrates the importance of early diagnosis and management of purulent pericarditis given its potential for rapid progression and high mortality.