title: Endocarditis With Fistulization and Rupture of Aortic Root Abscess to the Left Atrium.
abstract: BACKGROUND
  Infective endocarditis (IE) is a difficult emergency department (ED) diagnosis to make. Symptoms are nonspecific and diverse and the classic triad of fever, anemia, and murmur is rare. Severe IE causes considerable morbidity and mortality and should be diagnosed early. However, echocardiogram is essential but not readily available in the ED and can cause diagnostic delay.
  
  
  METHODS
  This case describes severe IE and its unique presentation, diagnostic challenges, and the use of bedside cardiac ultrasonography. A 28-year-old previously healthy male presented with intermittent fevers, arthralgias, and myalgias for 2 weeks. He had twice been evaluated and diagnosed with lumbar back pain. Physical examination revealed moderate respiratory distress, pale skin with a cyanotic right lower extremity, and unequal extremity pulses. He became hypotensive and rapidly deteriorated. Chest x-ray study showed bilateral pulmonary infiltrates with subsequent imaging demonstrating worsening septic emboli. Bedside ultrasound revealed mitral and aortic valve vegetations and a presumed diagnosis of IE with septic embolization was made. Formal echocardiography (ECHO) confirmed IE with an aortic root abscess with rupture and fistulization into the left atrium. WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: Clinical criteria for IE include blood cultures and ECHO, however, these are often not available to an emergency physician, making IE a diagnostic challenge even in severe cases. The role of bedside ultrasound for IE continues to evolve and its utility in the diagnosis of severe IE is distinctly demonstrated in this case.
authors.affiliation: Department of Emergency Medicine, University of Louisville, Louisville, Kentucky.
authors.forename: Melissa A
authors.initials: MA
authors.lastname: Platt
authors.affiliation: Department of Emergency Medicine, University of Louisville, Louisville, Kentucky.
authors.forename: Shirali
authors.initials: S
authors.lastname: Shah
authors.affiliation: Department of Emergency Medicine, University of Louisville, Louisville, Kentucky.
authors.forename: Matthew
authors.initials: M
authors.lastname: Allinder
mesh_terms: D000038:Abscess / Q000000981:diagnostic imaging / Q000382:microbiology*; D000328:Adult; D001018:Aortic Diseases / Q000000981:diagnostic imaging / Q000382:microbiology*; D001019:Aortic Rupture / Q000000981:diagnostic imaging / Q000382:microbiology*; D004697:Endocarditis, Bacterial / Q000150:complications* / Q000000981:diagnostic imaging; D017809:Fatal Outcome; D006325:Heart Atria / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D018608:Ultrasonography, Doppler; D016157:Vascular Fistula / Q000000981:diagnostic imaging / Q000382:microbiology*; D034363:Viridans Streptococci / Q000302:isolation & purification
keywords: abscess; endocarditis; fistula; ultrasound