Cardiac function early after repair of tetralogy of Fallot.

Hemodynamics of 12 patients with tetralogy of Fallot were monitored during the first 72 hours after surgical repair. Total immediate repair in 5 patients was followed after 24 hours by a greater decrease in cardiac index than that observed in the group of 4 patients with previous palliative shunt (minus 25 plus or minus 6 vs. minus 1 plus or minus 7 per cent, p smaller than 0.025). This difference disappeared after 48 hours, and the short-term follow-up periods of these two groups were equally smooth. Six patients with pulmonary stenosis requiring the placement of an outflow patch had higher right ventricular filling pressures (after 24 hours 13.8 vs. 10.8 mm. Hg, p smaller than 0.025; 2 to 4 weeks later 9.6 vs. 5.5 mm. Hg, p smaller than 0.05), suggestive of a persistent right ventricular depression. This ventricular depression must be attributed to the induced pulmonary insufficiency and to the presence of akinetic areas. Both these factors should therefore be carefully minimized during the surgical procedure.