Fig. 2From: Anesthesia management of laparoscopic right colectomy in an older patient with postoperative tetralogy of Fallot with residual anomalyThe changes of Qp/Qs. The preoperative Qp/Qs ratio was 2.3. It was reduced to 1.47 after positive pressure ventilation and 1.13 after insufflation. Qp/Qs, pulmonary to systemic blood flow ratioBack to article page