The study subjects were determined by medical history, symptoms, signs, and cardiac color Doppler ultrasound results, and were divided into 3 groups according to the New York Heart Function Classification (NYHA): Group A, Group B, and Group C. Among them, 20 patients with NYHA Ⅱ were classified In group A, 20 patients with NYHA Ⅲ were divided into group B, and 20 patients with NYHA Ⅳ were divided into group C.
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