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Impact of septal myectomy on diastolic function in patients with obstructive hypertrophic cardiomyopathy

Qiulan Yang1, Hao Cui2, Changsheng Zhu1

  • 1Department of Cardiovascular Surgery, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.

Journal of Thoracic Disease
|September 16, 2021
PubMed

Insights

Septal myectomy significantly improved diastolic function in obstructive hypertrophic cardiomyopathy (HCM) patients. This procedure reduced left ventricular outflow tract obstruction and relieved right ventricular congestion.

Area of Science:

  • Cardiology
  • Cardiac Surgery
  • Hemodynamics

Background:

  • Diastolic function impact post-septal myectomy in obstructive hypertrophic cardiomyopathy (HCM) remains understudied.
  • Obstructive HCM presents challenges in managing cardiac mechanics and patient outcomes.

Purpose of the Study:

  • To evaluate the effect of septal myectomy on left ventricular diastolic function in patients with obstructive HCM.
  • To assess hemodynamic changes, including outflow tract gradients and pulmonary pressures, following the procedure.

Main Methods:

  • A transcatheter hemodynamic study was conducted on 12 obstructive HCM patients.
  • Measurements were taken before and 3-6 months after septal myectomy.

Main Results:

  • Septal myectomy significantly reduced the left ventricular outflow tract gradient (83.2 to 11.6 mmHg).
  • Left ventricular diastolic function improved, indicated by a decreased time constant (Tau) from 64.2 to 42.2 ms.
  • Left atrial pressure and pulmonary artery pressures/resistance decreased, alleviating right ventricular congestion.

Conclusions:

  • Septal myectomy effectively enhances left ventricular diastolic function in obstructive HCM.
  • The procedure leads to significant hemodynamic improvements and relief of right ventricular congestion.
Abstract

Keywords:
Obstructive hypertrophic cardiomyopathycardiac catheterizationdiastolic functionmyectomy surgerypulmonary hypertension

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