Pulmonary artery growth after palliation of congenital heart disease with duct-dependent pulmonary circulation: arterial duct stenting versus surgical shunt.

OBJECTIVES: The aim of this study was to compare the pulmonary artery (PA) growth after arterial duct (AD) stenting versus modified Blalock-Taussig shunt (MBTS) in neonates with congenital heart disease with duct-dependent pulmonary circulation (CHD-DPC).
BACKGROUND: Arterial duct stenting is increasingly deemed a reliable alternative to surgical shunt in CHD-DPC. A stented duct might better adapt to the PA anatomy than a surgical conduit, thereby promoting a more uniform PA development.
METHODS: This study enrolled 27 patients with CHD-DPC submitted to AD stenting (n = 13, Group I) or MBTS (n = 14, Group II) at our institution. The PA growth was angiographically assessed with the Nakata and McGoon indexes as well as the individual PA z-scores. The right-to-left PA diameter ratio was considered as index of uniform growth.
RESULTS: After 10 +/- 5 months, both options had promoted a significant increase of the Nakata index (from 136 +/- 72 mm/m(2) to 294 +/- 99 mm/m(2), p < 0.0001, Group I; from 151 +/- 74 mm/m(2) to 295 +/- 177 mm/m(2), p < 0.003, Group II) and McGoon ratio (from 1.5 +/- 0.3 to 2.1 +/- 0.3, p < 0.0001, Group I; from 1.6 +/- 0.3 to 2.0 +/- 0.5, p < 0.01, Group II). However, the surgical shunt had caused a worsening of the left-to-right PA diameter ratio compared with AD stenting (0.9 +/- 0.1 Group I vs. 1.6 +/- 0.9 Group II, p < 0.01), due to preferential growth of the PA contralateral to the shunt.
CONCLUSIONS: Percutaneous AD stenting is as effective as MBTS in promoting a global PA growth in CHD-DPC. In addition, it ensures an even distribution of the pulmonary blood flow, thereby promoting a more balanced pulmonary vascular development than MBTS.