Background In electroconvulsive therapy (ECT), a generalized seizure is provoked under general anesthesia. Standard airway management is done by face mask ventilation, but this is difficult during generalized seizure. Transnasal humidified rapid-insufflation ventilatory exchange (THRIVE) is a method to increase apnea tolerance and permit apnea oxygenation. We hypothesize that THRIVE can oxygenate the patient during ECT and that it is comfortable for patients. Methods In this single-center feasibility study, 13 patients with a pharmacotherapy-resistant depressive disorder underwent 20 ECT sessions with the use of THRIVE. They received general anesthesia under standard monitoring and transcutaneous carbon dioxide monitoring. Afterward, they completed a survey comparing their prior experience with face mask oxygenation. Results There were no desaturations during the procedure, and patient comfort showed no difference in comparison to face mask. Compared with data from earlier ECT with face mask ventilation in the same patient, THRIVE did not seem to shorten seizure duration. Conclusions THRIVE is a novel, safe oxygenation method during ECT.