“…Low doses of ketamine can be useful for analgesia and sedation [1,2] but may also be associated with a variety of adverse effects including increased oral secretion, nausea and vomiting, hemodynamic instability, and postoperative hallucinations [3]. This may limit the use of ketamine, particularly in patients with cardiovascular, respiratory, neurological, psychological, and other diseases, which was shown in the study [1].…”