Bidirectional cavopulmonary anastomosis: impact on diastolic ventricular function indices

Area of Science:

• Cardiology
• Pediatric Cardiac Surgery
• Echocardiography

Background:

• Systolic ventricular function is generally preserved after bidirectional cavopulmonary anastomosis (BCPA).
• The impact of BCPA on diastolic ventricular performance remains incompletely understood.
• Assessing diastolic function post-BCPA is crucial for understanding ventricular adaptation.

Purpose of the Study:

• To prospectively evaluate changes in diastolic ventricular function indices early after BCPA.
• To quantify alterations in key echocardiographic parameters of diastolic performance.
• To identify potential hemodynamic or structural changes affecting diastolic function.

Main Methods:

• Prospective enrollment of 19 patients undergoing BCPA.
• Pre- and postoperative transthoracic echocardiograms performed within days of surgery.
• Measurement of systolic and diastolic indices, including end-diastolic volume, Tei index, inflow Doppler velocities (E, A), tissue Doppler velocities (E', A', S'), and flow propagation velocity.

Main Results:

• End-diastolic volume decreased postoperatively (p=0.05).
• The Tei index increased postoperatively (p=0.002), indicating impaired relaxation/filling.
• Inflow E velocity, E/A ratio, tissue Doppler E' velocity, and flow propagation velocity all significantly decreased (p<0.05).
• No significant changes were observed in ventricular mass, heart rate, or other systolic indices.

Conclusions:

• Diastolic indices of ventricular performance are significantly altered after BCPA, indicating decreased diastolic function.
• The observed decrease in diastolic function occurs early in the postoperative period.
• Further investigation is needed to determine the underlying causes, such as changes in ventricular loading conditions, geometry, or cardiopulmonary bypass effects.