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Postoperative haemodynamics in tetralogy of Fallot. A study of 132 children
Insights
Even after corrective repair for tetralogy of Fallot, residual cardiac anomalies are common. These abnormalities can affect myocardial function during exercise, even in asymptomatic patients.
Area of Science:
- Cardiology
- Pediatric Cardiology
- Congenital Heart Disease
Background:
- Tetralogy of Fallot is a complex congenital heart defect.
- Surgical correction aims to restore normal anatomy and function.
- Long-term outcomes and potential residual issues require ongoing investigation.
Purpose of the Study:
- To identify the type, incidence, and functional impact of residual anomalies post-tetralogy of Fallot repair.
- To assess cardiac function during rest and exercise in repaired patients.
- To correlate residual defects with physiological responses.
Main Methods:
- Retrospective review of cardiac catheterization data from 132 survivors of tetralogy of Fallot repair.
- Analysis of resting and exercise hemodynamics, including ventricular pressures and cardiac output.
- Comparison of responses between patients with and without significant residual defects.
Main Results:
- A significant residual ventricular septal defect was found in 12 patients.
- 32 patients exhibited elevated right ventricular systolic pressure (>80 mmHg).
- Abnormal myocardial responses during exercise (rising end-diastolic pressure, falling stroke index) were observed in 5 patients.
Conclusions:
- Residual abnormalities are frequent after tetralogy of Fallot repair, impacting cardiac function.
- Functional deficits may be present even in patients without overt symptoms.
- Comprehensive assessment is crucial for managing long-term outcomes.
Abstract:
Our study was undertaken to determine the type, incidence, and functional significance of residual anomalies in patients who have undergone corrective repair for tetralogy of Fallot. We reviewed data from cardiac catheterisations performed on 132 survivors. A significant residual ventricular septal defect was present in only 12 patients. Resting right ventricular systolic pressure was less than 80 mmHg in 100 patients and ranged from 80 to 150 mmHg in the other 32 patients. Thirty-five patients were studied both at rest and during supine exercise. In most patients, the relation between oxygen consumption and cardiac output was normal during exercise. The stroke index and right ventricular end-diastolic pressure at rest and on exercise were compared in 34 patients. Seventeen showed a normal response to exercise. In the other 17 patients, right ventricular end-diastolic pressure rose on exercise; in 5 of these the stroke index fell during exercise, indicating abnormal myocardial response. Our studies indicate the frequent occurrence of residual abnormalities, even in patients who appear asymptomatic, after total correction of tetralogy of Fallot.