Heart 2001;85:295-299 ( March )

Congenital heart disease

Lung function and aerobic capacity in adult patients following modified Fontan procedure P M Fredriksen, J Therrien, G Veldtman, M A Warsi, P Liu, S Siu, W Williams, J Granton, G Webb

Toronto General Hospital (University Health Network), University of Toronto Congenital Cardiac Centre for Adults, 200 Elizabeth Street 12th215 EN, Toronto, Ontario M5G 2C4, Canada

Correspondence to: Dr Webb gary.webb{at}uhn.on.ca

Accepted 8 November 2000

OBJECTIVETo examine cardiopulmonary performance in 52 adult patients with a Fontan circulation.
DESIGNRetrospective cohort study. Values of maximum oxygen uptake (VO₂max), maximum heart rate (HRmax), forced vital capacity (FVC), and forced expiratory volume in one second (FEV₁) were compared with predictive values for different age groups. Patients were further subdivided into those with a pulmonary artery connection (RA-PA) or right atrium to right ventricle conduit (RA-RV).
RESULTSAt late follow up (median 10 years, range 1 to 26 years), patients with Fontan circulation had greatly diminished VO₂max, HRmax, FVC, and FEV₁ compared with predicted values. Early age at surgery had a positive impact on aerobic capacity. The FEV₁:FVC ratio indicated restrictive lung function. No differences were found with respect to any variable between patients with RA-PA connections and those with RA-RV connections.
CONCLUSIONSPatients with a Fontan circulation have greatly diminished values of aerobic capacity and a restrictive pattern of lung function. Patients with an early surgical procedure obtained higher values of VO₂max. The theoretical benefits of including the right ventricle in a Fontan circulation were not apparent.


Keywords: congenital heart disease; exercise test; lung function; aerobic capacity

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© 2001 by Heart
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