Ventricular pump performance in patients with obstructed right ventricular-pulmonary artery conduits
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Children undergoing the Rastelli operation for right ventricular to pulmonary artery conduit obstruction had better RV ejection fraction when repaired earlier. Younger patients maintained normal RV function, while older patients showed decreased RV and LV ejection fraction post-surgery.
Area of Science:
- Cardiovascular Surgery
- Pediatric Cardiology
- Congenital Heart Disease
Background:
- The Rastelli operation is a palliative procedure for complex congenital heart defects involving right ventricular (RV) to pulmonary artery (PA) reconstruction.
- Partially obstructed RV-PA conduits can lead to significant morbidity and impact long-term cardiac function.
Purpose of the Study:
- To evaluate the long-term postoperative functional status of RV-PA conduits after the Rastelli operation.
- To assess the impact of age at repair on RV and left ventricular (LV) function in patients with obstructed RV-PA conduits.
Main Methods:
- Retrospective analysis of 18 patients 1-9 years post-Rastelli operation.
- Categorization into infant (1-8 months) and childhood (2-9 years) repair groups.
- Assessment of RV pressures, RV-PA gradients, RV ejection fraction (RVEF), and LV ejection fraction (LVEF).
Main Results:
- No significant difference in peak RV pressures or RV-PA gradients between infant and childhood repair groups.
- Normal RVEF in the infant group (0.60 +/- 0.10) versus decreased RVEF in the childhood group (0.43 +/- 0.11).
- Significant inverse relationship between RVEF and age at repair (r = 0.714; p < 0.005); decreased LVEF observed in the older group.
Conclusions:
- Early surgical repair (infancy) is associated with preserved RV function after the Rastelli operation.
- Delayed repair in childhood may lead to impaired RV and LV systolic function, highlighting the importance of timely intervention.
Abstract:
Postoperative data were obtained from 18 patients with partially obstructed right ventricular (RV) to pulmonary artery (PA) conduits, who were studied 1 to 9 years following a Rastelli operation. Age at operation was 1 to 8 months in seven patients (group I: infant group) and 2 to 9 years in the remaining 11 patients (group II: childhood group). The diagnosis was pulmonary atresia in eight patients, truncus arteriosus in seven, and transposition of the great arteries with ventricular septal defect and pulmonary stenosis in three. Porcine-valved conduits were inserted in 17 patients and an aortic homograft in one. All but seven patients were free of symptoms at the time of postoperative study. Neither peak RV pressures nor RV to PA gradients were different between groups. RV ejection fraction (EF) was decreased in group II (0.43 +/- 0.11) but was normal (0.60 +/- 0.10) in group I. In addition, there was a significant inverse relationship between RVEF and age at repair (r = 0.714; p less than 0.005). RV end-diastolic volume (EDV) was normal or increased in all patients and did not differ between the two groups. Left ventricular (LV) ejection fraction was also decreased in the older group (0.56 +/- 0.10 vs 0.68 +/- 0.08; p less than 0.05), and there was a decrease in RVEF and/or LVEF from pre- to postoperative studies in one of six group I patients compared with four of five group II patients.(ABSTRACT TRUNCATED AT 250 WORDS)