Tetralogy of Fallot is the most common cyanotic congenital heart disease and requires early surgical correction, this is a case of a patient who at six months undergoes palliative pulmonary systemic bypass surgery with modified Blalock Taussing fistula with Goretex graft, his condition does not improve with the passing of the years and a total correction surgery must be performed. Upon admission, the patient presents: dyspnea of medium efforts, asthenia, peribucal and distal cyanosis that yield with rest; in thorax presence of infra axillary scar compatible with previous palliative surgery, heart: rhythmic R1 and R2, phonetic norm, presence of holosystolic murmur in pulmonary focus and left infraclavicular murmur of pulmonary systemic fistula.