PMC4752252_01
A, Preoperative and postoperative audiograms of an example patient. Air-bone gap closed postoperatively. Intraoperative ECochG recordings are shown in (B-D). B, Baseline recording (C) after plugging (D) closing recording.
nihms758181f1.jpg
PMC4752252_01_nihms758181f1.jpg
F1
Hz (Fig. 1A). His ocular VEMP amplitude was high (35.6 muV) for air-conducted sound stimulation of the right ear but was normal at 1.4 muV for the left ear. At the start of surgery, the SP/AP ratio was elevated (0.68) for the affected ear (Fig. 1B), increased abruptly with dural elevation to 2.39 (Fig. 1C), and remained an elevated abnormal ratio of 1.18 after completion of the plugging and resurfacing (Fig. 1D). Nevertheless, when the patient returned 4 months after surgery, he noted resolution of all SCDS symptoms, and postoperative hearing test showed normal thresholds without ABGs (Fig. 1A).