Susan E. Hoover, MD, PhD; Steven H. Fischer, MD, PhD; Rebecca Shaffer, MD; Bryan M. Steinberg, MD; Daniel R. Lucey, MD
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Hoover S., Fischer S., Shaffer R., Steinberg B., Lucey D.; Endocarditis Due to a Novel Cardiobacterium Species. Ann Intern Med. 2005;142:229-230. doi: 10.7326/0003-4819-142-3-200502010-00030
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Published: Ann Intern Med. 2005;142(3):229-230.
TO THE EDITOR:
Background: Cardiobacterium hominis, a member of the HACEK group (Haemophilus, Actinobacillus, Cardiobacterium, Eikenella, and Kingella) of gram-negative rods, is the only Cardiobacterium species known to cause human disease.
Objective: We describe a case of endocarditis due to a new member of the Cardiobacterium genus.
Case Report: A previously healthy 46-year-old man gradually developed anorexia, exertional dyspnea, and fatigue over the course of 1 month. The patient had no significant medical history but had undergone dental extractions approximately 2 weeks before illness onset.
On admission, he was afebrile. His blood pressure was 131/85 mm Hg, his heart rate 100 beats/min, and his oxygen saturation was 98% while he was breathing room air. He appeared fatigued. The physical examination was significant for diminished breath sounds at both lung bases, a I/VI diastolic murmur heard best at the left lower sternal border, and lower-extremity edema. Laboratory studies revealed a leukocyte count of 12.5 × 109 cells/L, hematocrit of 0.38, and platelet count of 246 × 109 cells/L. Chest radiograph revealed bilateral pleural effusions. A transesophageal echocardiogram showed a bicuspid aortic valve with a 1-cm nodular density, severe aortic insufficiency, and a dilated left ventricle with an ejection fraction of approximately 0.20. Six blood cultures obtained over 24 hours grew a pleiomorphic, aerobic, and facultatively anaerobic gram-negative bacillus.
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