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Development of infundibular obstruction after percutaneous pulmonary balloon valvuloplasty
Insights
A 14-month-old boy experienced worsened right ventricular strain after balloon valvuloplasty for pulmonary stenosis. Surgical intervention was required to relieve new infundibular obstruction, highlighting potential risks of this procedure.
Area of Science:
- Pediatric Cardiology
- Interventional Cardiology
Background:
- Pulmonary valvular stenosis (PVS) is a congenital heart defect causing increased right ventricular pressure.
- Percutaneous balloon valvuloplasty is a common treatment for PVS in infants and children.
Observation:
- A 14-month-old boy with suprasystemic right ventricular pressure due to PVS underwent balloon valvuloplasty using a 12 mm balloon on a 10 mm anulus.
- Post-procedure, the patient developed severe right ventricular strain and a new systolic infundibular obstruction.
Findings:
- Right ventricular pressure nearly doubled post-valvuloplasty.
- The infundibular obstruction, absent pre-procedure, persisted and required surgical relief.
- Successful pulmonary valve opening was confirmed during surgery.
Implications:
- Using a balloon 20% larger than the anulus may be safe in pediatric patients.
- Balloon valvuloplasty can precipitate or exacerbate infundibular obstruction, potentially linked to PVS severity and infundibular hypercontractility.
- Careful patient selection and monitoring are crucial after balloon valvuloplasty for PVS.
Abstract:
A 14 month old boy with suprasystemic right ventricular pressure secondary to pulmonary valvular stenosis and anular size of 10 mm underwent percutaneous balloon valvuloplasty with a 12 mm balloon. Right ventricular pressure almost doubled after valvuloplasty and the electrocardiogram revealed development of severe right ventricular strain. Both findings persisted on the following day. A postvalvuloplasty right ventriculogram demonstrated a severe systolic infundibular obstruction not present before. The patient underwent surgical relief of infundibular obstruction; successful opening of the pulmonary valve by the balloon valvuloplasty was observed. It is concluded that a balloon size 20% larger than anular size can be safe in human subjects and that infundibular obstruction may appear or even worsen after balloon valvuloplasty. Such an obstruction may be related to the severity of pulmonary valvular obstruction and a hypercontractile infundibulum.