A 70-year-old woman was found to have new heart systolic murmur and was transferred to our hospital for the treatment of high fever and dyspnea. The chest X ray showed cardiomegaly (CTR 63%) and marked pulmonary congestion. The UCG revealed that there was no evidence of infective endocarditis, but there was hypertrophic obstructive cardiomyopathy with the left ventricular pressure gradient of 90 mmHg accompanied by mitral regurgitation (grade 3/4). Two weeks after the admission, mitral regurgitation progressed due to chordae rupture confirmed by UCG. Transaortic subvalvular myectomy and mitral valve replacement were underwent. Post-operative electrocardiogram demonstrated right and left anterior bandle branch block. Eleven months after the operation left ventricular outflow pressure gradient was not detected by echocardiogram and she has been in I/IV NYHA functional class.
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