Author + information
- Received October 24, 1994
- Revision received April 28, 1995
- Accepted May 3, 1995
- Published online October 1, 1995.
- David A. Harrison, MD, FRCPC,
- Peter Liu, MD, FRCPC, FACC,
- Janice E. Walters, BSCN, RN,
- Jack M. Goodman, PhD,
- Samuel C. Siu, MD, FRCPC, FACC,
- Gary D. Webb, MD, FRCPC, FACC,
- William G. Williams, MD, FRCSC and
- Peter R. McLaughlin, MD, FRCPC, FACC*
- ↵*Address for correspondence: Dr. Peter R. McLaughlin, Eaton Building 12-224, 200 Elizabeth Street, Toronto, Ontario. M5G 2C4, Canada.
Objectives. The clinical status and exercise assessment of adult patients late after the Fontan operation were reviewed to determine cardiovascular function.
Background. The Fontan operation is the final operation for many patients with tricuspid atresia or a single ventricle. Follow-up reports describe most patients to be in Canadian Cardiovascular Society functional class I or II. Objective measures of cardiac performance in the pediatric age group have shown significant dysfunction.
Methods. Forty-seven adult patients were seen late after the Fontan operation at the Toronto Congenital Cardiac Centre for Adults. Thirty of these underwent cycle ergometry to determine maximal exercise capacity. Maximal ventilation, maximal oxygen uptake and anaerobic threshold were determined from a ramp exercise protocol. Ejection fraction at rest and during exercise was measured with gated radionuclide angiography. Results were compared with those of eight normal volunteers. Results are given as mean ± SD.
Results. Thirty patients underwent cardiopulmonary exercise testing 6.7 ± 3.9 years after a first Fontan operation. Clinically 93% were in functional class I or II. The Fontan group patients had a significantly lower maximal work load (548 ± 171 vs. 1,094 ± 190 kilopond-meters, p < 0.00001), anaerobic threshold (11.2 ± 2.9 vs. 23.6 ± 4.6 ml/kg per min) and maximal oxygen consumption (14.8 ± 4.5 vs. 42.1 ± 10.0 ml/kg per min). Systemic ventricular ejection fraction was lower at rest (38 ± 12% vs. 58 ± 7%) and during exercise (40 ± 15% vs. 70 ± 8%).
Conclusions. Despite a clinical impression of good function, by objective measures adult patients continue to have significant cardiovascular limitation late after the Fontan operation.
This study was supported by a term grant from the Heart and Stroke Foundation of Ontario, Toronto, Ontario, Canada. Dr. Harrison is a research fellow, and Dr. Liu a Career Investigator, of the Heart and Stroke Foundation of Canada.
- Received October 24, 1994.
- Revision received April 28, 1995.
- Accepted May 3, 1995.
- American College of Cardiology