Hypereosinophilic syndrome with cardiac infiltration and congestive heart failure in a cat
2022
Beaumier, A. | Batista Linhares, M. | Rush, J.E. | Piedra-Mora, C.
Hypereosinophilic syndrome is an uncommon disorder in the cat. It is a heterogeneous group of conditions defined by a persistent hypereosinophilia associated with organ damage directly attributable to tissue hypereosinophilia. A seven-year-old castrated domestic shorthair cat presented to the emergency service for dyspnea. Initial physical examination identified the presence of a grade III/VI systolic left parasternal murmur with no gallop or arrhythmia. A snap N-terminal-pro hormone brain natriuretic peptide was abnormal, and a point-of-care ultrasound revealed mild pleural effusion, scant pericardial effusion, and an enlarged left atrium. There was leukemia (72.35 K/uL, reference range 4.5–15.7 K/uL) predominated by eosinophilia (33.84 K/uL; reference range 0–1.9 K/uL). On echocardiogram, there was concentric hypertrophy of the left ventricular walls with irregular endocardial borders. The left atrium was enlarged with evidence of spontaneous echogenic contrast. The mitral valve was thickened with a vegetative lesion on the anterior leaflet. Despite treatment, the patient experienced cardiopulmonary arrest, and cardiopulmonary resuscitation was unsuccessful. Complete necropsy with histopathology revealed eosinophilic infiltrates in multiple organs and the presence of a severe, acute-on-chronic, fibrinous, and eosinophilic-granulomatous endomyocarditis with mural thrombosis and marked endocardial fibrosis. This case represents an unusual presentation of the hypereosinophilic syndrome in the cat with cardiac involvement and congestive heart failure as a primary clinical sign.
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