Total cavopulmonary anastomosis versus conventional modified Fontan procedure

Area of Science:

• Cardiology
• Pediatric Cardiac Surgery

Background:

• The Fontan procedure is a palliative surgery for complex single-ventricle congenital heart defects.
• The total cavopulmonary anastomosis (TCPC) with a lateral tunnel is a modification of the Fontan procedure.
• Comparing outcomes between the lateral tunnel Fontan and the conventional modified Fontan is crucial for surgical decision-making.

Purpose of the Study:

• To compare the early and late outcomes of the total cavopulmonary anastomosis (lateral tunnel Fontan) versus the conventional modified Fontan procedure.
• To evaluate differences in mortality, morbidity, dysrhythmias, and pacemaker requirements between the two surgical techniques.

Main Methods:

• A retrospective study comparing 39 patients undergoing total cavopulmonary anastomoses (group 1) with 39 patients undergoing modified Fontan procedures (group 2) between 1987 and 1990.
• Exclusion of patients with adjustable atrial septal defects.
• Analysis of early outcomes (mortality, effusions, hospital stay, dysrhythmias, pacemaker use) and late outcomes (mortality, rhythm status, pacemaker requirements) with mean follow-up periods of 18 and 25 months, respectively.

Main Results:

• Early mortality was comparable: 7.7% in group 1 and 2.6% in group 2.
• No significant differences were observed in early complications, dysrhythmias, or pacemaker placement.
• Late follow-up revealed lower rates of dysrhythmias (1/33 vs 4/27) and need for pacemakers (0 vs 5) in the lateral tunnel group compared to the conventional modified Fontan group.

Conclusions:

• The total cavopulmonary anastomosis (lateral tunnel Fontan) demonstrates comparable early outcomes to the conventional modified Fontan procedure.
• The lateral tunnel approach appears to offer an advantage in reducing the incidence of late dysrhythmias and the need for pacemaker placement.
• These findings suggest the lateral tunnel modification may lead to improved long-term cardiac rhythm status following Fontan-type repairs.