Irreversible morphological changes contributing to depressed cardiac function after surgery for chronic aortic...

Area of Science:

• Cardiology
• Cardiac Surgery
• Histopathology

Background:

• The optimal timing for surgical intervention in chronic aortic regurgitation is challenging.
• Left ventricular (LV) remodeling in response to chronic aortic regurgitation impacts surgical outcomes.
• Predictive markers for postoperative recovery are needed.

Purpose of the Study:

• To identify preoperative variables that predict postoperative hemodynamic improvement and LV recovery in patients with chronic aortic regurgitation.
• To correlate myocardial histochemical and morphological changes with clinical outcomes.

Main Methods:

• Analysis of LV mass, volume, morphology, and histochemistry in 67 patients undergoing aortic valve surgery.
• Division of patients into two groups based on postoperative LV echo diameters (normal vs. persistent dilation).
• Correlation of preoperative and postoperative biopsy data with clinical and hemodynamic status over three years.

Main Results:

• Incomplete regression of LV hypertrophy was common.
• Massive fiber hypertrophy, increased interstitial fibrosis, and reduced enzyme levels (adenosine triphosphates, succinate dehydrogenase) correlated with persistent LV dilation, heart failure, and early death.
• Echocardiographic and angiographic data alone could not predict irreversible dysfunction.

Conclusions:

• Preoperative myocardial biopsy findings are of prognostic importance in chronic aortic regurgitation.
• Irreversible morphological and functional changes in the myocardium contribute to depressed cardiac function after surgery.
• Histochemical analysis of ventricular biopsies can identify patients likely to have poor outcomes.