In this multicentre Dutch registry of 335 patients with hypertrophic obstructive cardiomyopathy, surgical myectomy produced marked early haemodynamic improvement, with the mean resting left ventricular outflow tract gradient falling from 61 ± 30 mmHg to 13 ± 12 mmHg.
Thirty-day adverse outcomes were not negligible: mortality was 5%, stroke 3%, ventricular septal defect 2%, and surgical reoperation 2%.
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