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Brain natriuretic peptide levels before and after ventricular septal defect repair
Richard D Mainwaring1, Carol Parise, Stanley B Wright
1Sutter Medical Center, Sacramento, California, USA. mainwar@sutterhealth.org
Insights
Brain natriuretic peptide (BNP) levels correlate with heart defect severity in children. Preoperative BNP levels predict postoperative changes, suggesting BNP is a useful marker for ventricular septal defects.
Area of Science:
- Pediatric Cardiology
- Biomarkers in Congenital Heart Disease
- Cardiac Physiology
Background:
- Brain natriuretic peptide (BNP) is a mediator linked to heart failure severity in adults.
- This study investigates BNP levels in pediatric patients undergoing ventricular septal defect (VSD) repair.
- Understanding BNP's role in pediatric VSDs is crucial for clinical management.
Purpose of the Study:
- To evaluate preoperative and postoperative Brain Natriuretic Peptide (BNP) levels in infants and children undergoing Ventricular Septal Defect (VSD) repair.
- To determine the correlation between BNP levels and the physiological shunt volume (Q(p)/Q(s)) in pediatric VSD patients.
- To assess the predictive value of preoperative BNP levels for postoperative BNP changes.
Main Methods:
- Enrolled 18 pediatric patients (2 months to 15.6 years) for VSD surgical repair.
- Measured BNP levels preoperatively and at 1, 24, 48, and 72 hours postoperatively.
- Quantified the shunt volume (Q(p)/Q(s)) using saturation data from catheterization or intraoperative measurements.
Main Results:
- Significant increases in postoperative BNP levels were observed at all time points (1, 24, 48, 72 hours) compared to preoperative levels.
- Preoperative BNP levels showed a significant correlation with the shunt volume (Q(p)/Q(s)) (age-adjusted R(2) = 0.33, p < 0.001).
- Preoperative BNP levels were predictive of the postoperative trajectory of BNP levels.
Conclusions:
- BNP levels closely correlate with the physiological volume load imposed by VSDs.
- Preoperative BNP levels can predict the postoperative course of BNP changes in pediatric VSD patients.
- BNP may serve as a valuable clinical biomarker for infants and children diagnosed with VSDs.
Background:
Brain natriuretic peptide is a relatively recently discovered circulating mediator that has been correlated with the degree of heart failure in adults. This study evaluated the preoperative and postoperative brain natriuretic peptide levels in infants and children undergoing ventricular septal defect repair.
Methods:
The study enrolled 18 infants and children (ages 2 months to 15.6 years) scheduled for surgical repair of their ventricular septal defects. Brain natriuretic peptide levels were drawn preoperatively and then postoperatively at 1, 24, 48, and 72 hours. The amount of shunt (the ratio of pulmonary blood flow [Q(p)]/systemic blood flow [Q(s)]) through the ventricular septal defect was determined by saturation levels performed in the catheterization laboratory or intraoperatively.
Results:
The preoperative brain natriuretic peptide levels (pg/mL) averaged 78 +/- 57, and the postoperative levels were 168 +/- 241 at 1 hour, 418 +/- 330 at 24 hours, 405 +/- 364 at 48 hours, and 391 +/- 397 at 72 hours. These differences were significant for each postoperative time point compared with preoperative values. Preoperative brain natriuretic peptide and the Q(p)/Q(s) were significantly correlated (age-adjusted R(2) = 0.33, p < 0.001).
Conclusions:
Brain natriuretic peptide levels have a close correlation with the physiologic volume load caused by ventricular septal defects. The preoperative brain natriuretic peptide levels were also found to be predictive for the postoperative time course of brain natriuretic peptide level changes. These results suggest that brain natriuretic peptide levels may be a useful clinical marker in infants and children with ventricular septal defects.
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