Rescue right ventricular outflow tract stenting for refractory hypoxic spells

Area of Science:

• Pediatric Cardiology
• Interventional Cardiology
• Congenital Heart Disease

Background:

• Right ventricular outflow tract stenting (RVOTS) is an alternative to palliative surgery for Tetralogy of Fallot (TOF).
• The effectiveness of RVOTS for refractory hypoxic spells remains unclear.

Purpose of the Study:

• To evaluate the utility of RVOTS for emergency relief of refractory hypoxic spells.
• To assess the safety and efficacy of modified RVOTS techniques.

Main Methods:

• Retrospective review of 11 patients undergoing RVOTS for refractory hypoxic spells.
• Utilized modified techniques including upfront stent delivery systems and specialized wire use for expeditious procedures.
• Median patient age was 27 days, with a median pulmonary annulus Z score of -4.13.

Main Results:

• RVOTS significantly improved oxygen saturation from 45% to 90% (p < 0.0001) without major complications.
• Median stent diameter was 5 mm, with a median fluoroscopy time of 13.6 minutes.
• Four patients required re-stenting, and 3 underwent subsequent surgical repair within a median follow-up of 7 months.

Conclusions:

• RVOTS is a safe, rapid, and effective short-term palliative option for refractory hypoxic spells.
• Specific technical modifications improve the safety, ease, and speed of RVOTS procedures.
• Further evaluation is needed for long-term outcomes and the role of RVOTS in the management of complex congenital heart disease.