Flow Simulation in the Upper Respiratory Tract of Two Obstructive Sleep Apnea Patients with Successful and Failed Surgery

Figure 2

Four URT models: (a1, a2) subject 1 before surgery, (b1, b2) subject 1 after surgery, (c1, c2) subject 2 before surgery, and (d1, d2) subject 2 after surgery. Section A is the minimal cross section, and section B is the cross section near the larynx. (a1–d1) Side view; (a2–d2) front view.