Doppler echocardiographic evaluation of left ventricular diastolic function after surgical correction of atrial...

Area of Science:

• Cardiology
• Pediatric Cardiology
• Cardiac Surgery

Background:

• Atrial septal defect (ASD) can lead to right ventricular volume overload and potential left ventricular diastolic dysfunction.
• Early surgical correction is a common treatment for secundum type ASD.
• The underlying cause of left ventricular diastolic dysfunction in ASD patients remains debated.

Purpose of the Study:

• To investigate left ventricular diastolic function in pediatric patients post-ASD repair.
• To assess the impact of surgical correction on right ventricular volume overload parameters.
• To differentiate between intrinsic and acquired causes of diastolic dysfunction in ASD.

Main Methods:

• Doppler echocardiography was used to measure transmitral flow (A/E ratio) in 21 ASD patients and 21 controls.
• M-mode recordings evaluated interventricular septal motion (IVS) and ventricular diameter ratios (LVDD/RVDD) pre- and post-surgery in 12 patients.
• Parameters assessed included left ventricular diastolic function and right ventricular volume overload.

Main Results:

• No significant difference in A/E ratio (diastolic function) was observed between ASD patients and controls.
• Postoperative normalization of IVS was noted in 11 of 12 patients.
• Right ventricular volume overload (LVDD/RVDD) significantly improved post-surgery, normalizing the difference between groups.

Conclusions:

• Left ventricular diastolic dysfunction in ASD patients is unlikely due to intrinsic LV abnormalities.
• Acquired abnormalities, potentially related to prior right ventricular volume overload, may cause diastolic dysfunction.
• Surgical correction effectively resolves mechanical sequelae of right ventricular volume overload in ASD patients.