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Pulmonary and ventricular functions in children with repaired tetralogy of Fallot
Savaş Demirpençe1, Barış Güven2, Murat Muhtar Yılmazer3
1Department of Pediatric Cardiology, Sifa University Faculty of Medicine, Izmir, Turkey. savasdemirpence@yahoo.com.
Insights
Children with repaired Tetralogy of Fallot (TOF) show impaired ventricular and lung function. Right ventricular myocardial performance index (MPI), FEV1, FVC, and 6-minute walking test (6MWT) distance are key indicators for follow-up.
Area of Science:
- Pediatric Cardiology
- Congenital Heart Disease Research
- Cardiopulmonary Function Assessment
Background:
- Tetralogy of Fallot (TOF) is a complex congenital heart defect requiring surgical repair.
- Long-term outcomes and functional status in repaired TOF patients require ongoing evaluation.
- Assessing biventricular function, respiratory capacity, and exercise tolerance is crucial for managing these patients.
Purpose of the Study:
- To evaluate biventricular function, brain natriuretic peptide levels, respiratory function, and 6-minute walking test (6MWT) distance in children with repaired TOF.
- To analyze the correlation between these functional parameters and the clinical status of children post-TOF repair.
- To identify potential biomarkers for monitoring long-term health in repaired TOF pediatric population.
Main Methods:
- A comparative study involving 25 children with repaired TOF and 25 healthy controls.
- Utilized Tissue Doppler echocardiography to assess biventricular myocardial performance indices (MPIs) and timings.
- Measured respiratory function (spirometry including FVC, FEV1, FEF25-75, and inspiratory capacity) and 6MWT distance.
Main Results:
- Children with repaired TOF exhibited significantly higher right and left ventricular MPIs and altered ventricular timings compared to controls.
- Significantly reduced spirometry parameters (FVC, FEV1, FEF25-75) and inspiratory capacity were observed in the repaired TOF group.
- Repaired TOF patients demonstrated significantly lower 6MWT distances, with right ventricular MPI correlating with FEV1, FVC, and 6MWT distance.
Conclusions:
- Repaired Tetralogy of Fallot is associated with impaired biventricular and pulmonary functions.
- Right ventricular MPI, alongside FEV1, FVC, and 6MWT distance, may serve as valuable tools for monitoring children post-TOF repair.
- These functional parameters can aid in the comprehensive follow-up and management of pediatric patients with repaired TOF.
Objective:
This study aimed to evaluate biventricular function, brain natriuretic peptide levels, respiratory function test and 6 minute walking test (6MWT) in children with repaired tetralogy of Fallot (TOF), and analyse the correlation between these variables and clinical status.
Methods:
Twenty-five children (14 boys, 11 girls; aged 6 to 17 years) with repaired TOF (Group 1) and 25 age-sex matched healthy controls (Group 2) were enrolled in the study. Tissue Doppler echocardiography, respiratory function test, 6MWT distance and brain natriuretic peptide levels were measured.
Results:
Mean ages of the children at TOF corrective surgery and at study time were 5.1±3.5 years and 11.6±2.7 years respectively. The duration between palliative operation and corrective surgery was 4.3±2.0 years, and the follow-up period after corrective surgery was 6.3±3.0 years. The right ventricular and left ventricular myocardial performance indices (MPIs), and isovolumic relaxation and contraction times were significantly higher in Group 1 than in Group 2 (p<0.01). Spirometry displayed significantly reduced forced vital capacity (FVC), forced expiratory volume in one second (FEV1), forced expiratory flow 25-75% (FEF25-75) and inspirational capacity in Group 1 compared to Group 2 (p<0.01). In Group 1, 6MWT distances were significantly lower than in Group 2 (p=0.001). Right ventricular MPI is correlated with FEV1, FVC and 6MWT distance in the current study.
Conclusion:
The children with repaired TOF had impaired ventricular and pulmonary functions. Hence, right ventricular MPI along with FEV1, FVC and 6MWT distance may be useful in the follow-up of children with repaired TOF.
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