Post-procedure Rhinitis After Use of Sedatives and Supplemental Nasal Oxygen.

Post-procedure rhinitis is a form of nonallergic rhinitis that is a common but underreported complication occurring after procedures requiring sedation and the use of supplemental oxygen via nasal cannula. Symptoms occur immediately after awakening from sedation and may be so unbearable, that it impairs work, daily functioning, sleep patterns, and quality of life. This case describes a 67-year-old male who developed these symptoms after esophagogastroduodenoscopy (EGD) under sedation with supplemental oxygen via nasal cannula. The proposed pathophysiology is thought to be due to the impingement of the cannula against mechanoreceptors in the nasal mucosal membrane causing parasympathetic overactivity. Based on this pathogenesis, the reported patient failed to show improvement with oral antihistamines but instead benefited from a topical anticholinergic agent. Patients at risk should be informed of the possibility of this adverse event and advised on proper treatment if it occurs.