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J Thorac Cardiovasc Surg 1997;113:989-993
© 1997 Mosby, Inc.

SURGERY FOR CONGENITAL HEART DISEASE

COAGULATION FACTOR ABNORMALITIES AFTER THE FONTAN PROCEDURE AND ITS MODIFICATIONS

Received for publication May 6, 1996; revisions requested June 25, 1996; revisions received Feb. 17, 1997; accepted for publication Feb. 18, 1997. Address for reprints: Mr. C. Lincoln, Department of Cardiac Surgery, Royal Brompton Hospital, Sydney St., London SW3 6NP, United Kingdom.

Abstract

Objective: Recently we reported the prevalence of thromboembolism in patients who underwent the Fontan procedure and its modifications. Although hemodynamic factors may well contribute to thromboembolism, recent evidence suggests that coagulation factor abnormalities may also play a role. We therefore set out to investigate the coagulation status in a group of patients who had undergone the Fontan procedure. Methods: The study population consists of 20 children who had undergone the Fontan procedure and its modifications. They were examined for coagulation factor abnormalities. Concentrations of serum albumin, total protein, and liver enzymes were also measured. The median age at the time of the operation was 6.2 years (17 months to 8 years) with a male/female ratio of 2.3:1. The median time from the Fontan repair was 4.9 years (18 to 76 months). Results: Protein C (p < 0.001), protein S (p < 0.02), and factor VII (p < 0.001) were significantly lower than the normal range. The changes in serum albumin and total protein and factors II, IX, and X were not significant. Conclusions: It is possible that deficiency in protein C, protein S, and factor VII partly account for the prevalence of thromboembolism after Fontan-type repairs. The risk of long-term anticoagulation should be weighed against the best palliative procedure for these patients. We suggest that reduced protein C, protein S, and factor VII levels in this group of patients should be regarded as risk factors and that such patients should be treated with anticoagulants.

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