고양이 SFTS의 심근 손상 — 트로포닌·심초음파 증거와 감별 (8단계)

Severe fever with thrombocytopenia syndrome (SFTS) is an emerging Revised February 21, 2026 Accepted March 5, 2026 tick-borne zoonosis caused by the SFTS virus (SFTSV). In humans, myocardial injury is recognized as a severe complication; however, cardiac involvement in *Correspondence: Jihyun Kim feline SFTS remains poorly characterized. A 6-year-old neutered male domeskts7375@hanmail.net tic shorthair cat with regular outdoor access presented with a 1-day history of Funding None. anorexia, lethargy, and diarrhea. The cat was febrile (40.4°C), and multiple ticks were identified on physical examination. Laboratory testing revealed severe thrombocytopenia, hyperbilirubinemia, and markedly elevated cardiac troponin I (cTnI; 15.2 ng/mL; reference <0.18 ng/mL). Real-time reverse transcription quantitative polymerase chain reaction (RT-qPCR) was positive for SFTSV, while other infectious disease testing was negative. Echocardiography demonstrated mild left ventricular wall thickening, ill-defined hyperechoic myocardial regions, impaired relaxation, and dynamic left ventricular outflow tract obstruction. Despite intensive supportive treatment, the cat died on hospital day 4. This case describes severe myocardial injury occurring in temporal association with SFTSV infection and highlights the need for further investigation into the clinical significance of cardiac involvement in feline SFTS.