Pulmonary Vasodilator Therapy in Patients With Fontan Circulation: A Meta-Analysis.

Area of Science:

• Cardiology
• Pediatric Cardiology
• Pulmonary Hypertension

Background:

• Fontan circulation presents unique challenges for managing pulmonary hemodynamics.
• The efficacy of pulmonary vasodilator therapy in this population is not well-established.

Purpose of the Study:

• To assess the impact of pulmonary vasodilator therapy on exercise capacity.
• To evaluate the effects on hemodynamic parameters in patients with Fontan circulation.

Main Methods:

• Systematic literature search of PubMed, Embase, and Cochrane Library up to November 2023.
• Meta-analysis of pooled outcomes from 18 studies involving 667 patients.

Main Results:

• Pulmonary vasodilators improved oxygen consumption anaerobic threshold (VO₂AT) and Ve/VCO₂ slope during exercise.
• Significant reductions were observed in mean pulmonary arterial pressure and pulmonary vascular resistance.
• Pulmonary flow was also significantly improved with vasodilator therapy.

Conclusions:

• Pulmonary vasodilator therapy demonstrates potential benefits for exercise capacity and hemodynamics in Fontan patients.
• Further high-quality randomized controlled trials are necessary to solidify these findings.