Theophylline Effects in the Fontan Circulation

A single group treatment phase 2 single-arm no-masking study to assess safety and efficacy of a short-term oral treatment with theophylline (ATC-no. R03D A04) in terms of improvements in cardiorespiratory fitness, health-related quality of life, cardiac performance and respiratory function in male and female adolescents aged 16 to 25 years with a Fontan-type surgical palliation of univentricular congenital heart disease.