{Reference Type}: Case Reports {Title}: A unique case of very low-dose subcutaneous ketamine use: Maintenance option of ketamine for treatment-resistant depression. {Author}: Can AT;Hermens DF;Lagopoulos J; {Journal}: Clin Case Rep {Volume}: 10 {Issue}: 12 {Year}: Dec 2022 暂无{DOI}: 10.1002/ccr3.6675 {Abstract}: Numerous studies have demonstrated that low-dose subanesthetic intravenous ketamine infusion treatment leads to rapid improvement of treatment-resistant depression. The following case report describes the use of a very low-dose subcutaneous ketamine as a form of maintenance in a patient with severe treatment-resistant depression using a retrospective chart review.