Introduction: Tetralogy of Fallot (ToF) is the most common cyanotic heart condition after the neonatal period, accounting for 5% to 10% of all congenital heart disorders (CHD). Surgical repair of the right ventricular outflow tract obstruction (RVOTO) has developed through time, from the common use of transannular patch enlargement (TAPE) of the pulmonary valve annulus (PVA) to the more recent trend of valve-sparing surgical procedures to preserve the PVA. To avoid serious and escalating difficulties associated with TAPE, the latter approach is preferred. Other parameters have been proposed and some have been determined to be better predictors of TAPE in ToF surgeries. The decision on TAPE is primarily based on the PVA z-score, which is subject to variability across different surgeons and centres; as a result, other parameters have been proposed and some have been determined to be better predictors of TAPE in ToF surgeries.
The goal of this study was to find out whether factors predict transannular patch growth in ToF procedures at a CHD specialty facility.
Methods: Between July 2018 and April 2019, all patients with ToF who presented to a major CHD centre – the Sri Sathya Sai Sanjeevani Hospital (SSSSH) in Raipur, India – were studied retrospectively. Patients’ demographics, anthropometry, and echocardiographic characteristics were among the parameters sought and collected. The z-scores and other variables that could be calculated were calculated and placed into a database. SPSS was used to conduct the analysis. Continuous variables were represented in means, medians, and ranges using descriptive statistics, while categorical variables were represented in bar chats. The means of the groups were subjected to analysis of variance.
There were 135 patients, ranging in age from 7 months to 199 months, with 89 males (65.9 percent ). TAPE took 36 hours to complete (26.7 percent ). The TAPE group had significantly reduced aortic valve diameter (18.3 vs 20mm, p=0.037), pulmonary valve diameter (10.1 vs 12.0mm, P=0.003), and pulmonary valve Z-score (-2.48 vs -1.47, p=0.011). The great artery ratio (PVA/AoV) did not predict TAPE usage in a univariate study. A GA ratio of 0.54 was, however, substantially related with a greater risk of TAPE (odds ratio 2.37). (CI: 1.47 to 3.9). The multivariate logistic model for TAPE usage in TOF properly predicted 70.8 percent of the children with TOF who received TAPE and explained 15% (R2) of the variance in TAPE use. The area under the curve for who received TAPE was 65 percent (95 percent) predictability. CI ranges from 53.5 percent to 76.6 percent.
Conclusion: TAPE is predicted by PVA diameter, Aortic valve diameter, and PVA z-score. TAPE is more likely if the GA ratio is less than 0.54. Clinical parameters are ineffective as TAPE predictors.
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