Right ventricular volume measurements in ventilated preterm neonates

Area of Science:

• Neonatal Medicine
• Pediatric Cardiology
• Respiratory Physiology

Background:

• Pulmonary hypertension in infants is linked to poor perinatal outcomes.
• Right ventricular dysfunction can impair pulmonary blood flow in neonates with respiratory disorders.
• Understanding right ventricular changes is crucial for managing infants with respiratory distress syndrome.

Purpose of the Study:

• To track changes in right ventricular volumes in infants with respiratory distress syndrome during the initial 2 days of life.
• To assess the impact of mechanical ventilation on right ventricular function in preterm neonates.

Main Methods:

• Serial echocardiographic examinations were conducted on days 0-2 in ventilated infants with respiratory distress syndrome.
• Two-dimensional echocardiography with ellipsoid approximation was used to calculate systolic and diastolic volumes.
• Right ventricular ejection fraction and output were also measured.

Main Results:

• Right ventricular volumes (end-systolic and end-diastolic) were significantly lower on day 2 compared to day 0.
• Right ventricular ejection fraction increased significantly from day 0 to day 2 (0.48 to 0.62).
• Right ventricular output also showed a significant increase during the study period (120 to 140 ml/kg/min).

Conclusions:

• Ventilated preterm infants with respiratory distress syndrome experience a decrease in right ventricular volumes within the first 2 days of life.
• Despite volume reduction, right ventricular performance, including ejection fraction and output, is maintained.
• These findings suggest compensatory mechanisms that preserve cardiac function during respiratory support.