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Left ventricular efficiency after ligation of patent ductus arteriosus for premature infants
Hazumu Nagata1, Kenji Ihara, Kenichiro Yamamura
1Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
Insights
Patent ductus arteriosus ligation temporarily reduces left ventricular efficiency in premature infants due to increased afterload. However, ventricular function recovers within days, offering insights for postoperative care.
Area of Science:
- Neonatal cardiology
- Pediatric cardiovascular physiology
- Hemodynamics
Background:
- Patent ductus arteriosus (PDA) is common in premature infants.
- PDA ligation is a critical intervention impacting cardiovascular hemodynamics.
- Understanding left ventricular (LV) function post-ligation is crucial for neonatal care.
Purpose of the Study:
- To assess hemodynamic changes in LV function after PDA ligation in premature infants.
- To evaluate the energetic efficiency of LV pumping before and after PDA ligation.
- To correlate LV efficiency with contractility and afterload parameters.
Main Methods:
- Study included 35 premature infants undergoing PDA ligation.
- LV efficiency measured at 4 time points: pre-ligation, 24h post-ligation, days 2-4, and day 7.
- LV contractility (end-systolic elastance) and afterload (effective arterial elastance) approximated.
- Ventricular efficiency calculated as stroke work to pressure-volume area ratio.
Main Results:
- LV efficiency transiently decreased within 24 hours post-ligation.
- This deterioration was attributed to increased afterload and minor contractility changes.
- LV efficiency returned to pre-ligation levels by 2-4 days post-surgery.
Conclusions:
- Post-ligation LV energetic efficiency is transiently impaired.
- Monitoring LV indices aids in managing premature infants post-PDA ligation.
- Understanding hemodynamic shifts informs clinical decision-making in the postoperative period.
Objective:
The purpose of this study was to evaluate the hemodynamic changes in left ventricular function before and after patent ductus arteriosus ligation in premature infants with regard to the energetic efficiency of left ventricular pumping.
Methods:
Thirty-five premature infants who underwent patent ductus arteriosus ligation were enrolled in this study. Left ventricular efficiency was evaluated at 4 points: within 24 hours before patent ductus arteriosus ligation, within 24 hours after patent ductus arteriosus ligation, between postoperative days 2 and 4, and on postoperative day 7. The indices of contractility (end-systolic elastance) and afterload (effective arterial elastance) were approximated on the basis of the systemic blood pressure and systolic or diastolic left ventricular volume. The ratio of stroke work and pressure-volume area, representing the ventricular efficiency, was estimated using the following theoretic formula: the ratio of stroke work and pressure-volume area = 1/(1 + 0.5 ventriculoarterial coupling).
Results:
Left ventricular efficiency was transiently deteriorated within 24 hours after patent ductus arteriosus ligation because of the marked increase of the afterload and the slight increase of contraction, and then recovered to preoperation levels by 2 to 4 days after patent ductus arteriosus ligation.
Conclusions:
Analysis of indices representing the afterload, contractility, and energetic efficiency of the left ventricle may provide practical information for the management of premature infants during the postoperative period after patent ductus arteriosus ligation.
