Resultados a largo plazo del tratamiento mediante dilatación con balón en pacientes con estenosis subaórtica de membrana: un estudio de 24 años

Abstract

Aim Percutaneous transluminal balloon dilation is an alternative to surgery in discrete subaortic stenosis (DSS). Methods We included 75 patients with percutaneously treated DSS, who were followed up for a mean period of 16 ± 6 years. Results Mean age at treatment was 18 ± 16 years old. The peak gradient decreased from 70 ± 27 mmHg to 18 ± 12 mmHg ( P < .001). One patient died immediately after dilation. During the follow-up there was one non-cardiac death, 11 patients demonstrated restenosis, 3 patients developed a thick fibromuscular ring and 1 patient developed a new distant membrane. Treatment age was lower in those who developed restenosis than in those who did not (11 ± 13 vs 22 ± 17 years old; P < .05). Twelve patients underwent redilation and four patients required surgery. Most patients (75%) remained free from redilation or surgery. The mean residual gradient was 31 ± 15 mmHg. Conclusion Gradient release remains after long-term follow up in most patients with discrete subaortic stenosis treated by percutaneous balloon dilation.