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Effects of septal myectomy on left ventricular diastolic function and left atrial volume in patients with

Albree Tower-Rader1, Nicholas Furiasse1, Jyothy J Puthumana1

  • 1Division of Cardiology, Department of Medicine, Bluhm Cardiovascular Institute, Northwestern University Feinberg School of Medicine, Chicago, Illinois.

The American Journal of Cardiology
|September 28, 2014
PubMed

Insights

Septal myectomy for obstructive hypertrophic cardiomyopathy (HC) significantly reduces left ventricular outflow tract (LVOT) gradients and improves heart function. This surgery also leads to reduced left atrial (LA) volume and enhanced diastolic function in HC patients.

Area of Science:

  • Cardiology
  • Cardiac Surgery
  • Echocardiography

Background:

  • Obstructive hypertrophic cardiomyopathy (HC) is characterized by left ventricular outflow tract (LVOT) obstruction.
  • Septal myectomy is a primary treatment for symptomatic obstructive HC, aiming to relieve LVOT gradients.
  • Limited data exist on the impact of septal myectomy on left atrial (LA) volume and left ventricular (LV) diastolic function.

Purpose of the Study:

  • To investigate the effects of septal myectomy on LA volume and LV diastolic function in patients with obstructive HC.
  • To assess changes in echocardiographic parameters and clinical symptoms following the procedure.

Main Methods:

  • A retrospective study of 25 patients with obstructive HC who underwent septal myectomy between 2004 and 2011.
  • Serial echocardiography was performed at baseline and follow-up (mean 527 days post-surgery, at least 6 months after myectomy).
  • Analysis included left atrial volume index (LAVI), LV diastolic function parameters (e.g., lateral e' velocity, E/e'), LVOT gradient, and New York Heart Association (NYHA) functional class.

Main Results:

  • Septal myectomy led to a significant reduction in LAVI (47.2 to 35.9 ml/m², p=0.001).
  • LV diastolic function improved, evidenced by increased lateral e' velocity (7.3 to 9.8 cm/sec, p=0.01) and a trend towards decreased E/e' (14.8 to 11.7, p=0.051).
  • LVOT gradient decreased, and NYHA functional class improved, with a significant reduction in severe symptoms (NYHA class III/IV).

Conclusions:

  • Septal myectomy effectively relieves LVOT obstruction in patients with HC.
  • The procedure results in significant improvements in LV diastolic function and a reduction in LA volume.
  • These echocardiographic improvements correlate with enhanced clinical symptoms and functional capacity in patients with obstructive HC.

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