IRCT20231002059586N1 IRCT 2023-10-23 Gorgan University of Medical Sciences Evaluation the effect of ketamine as a prevention of shivering after spinal anesthesia in lower limb orthopedic surgery in 5Azar hospital in 1402(2023) Evaluation the effect of ketamine as a prevention of shivering after spinal anesthesia in lower limb orthopedic surgery in 5Azar hospital in 1402(2023) 2023-11-06 anticipated 60 Complete https://irct.ir/trial/72908 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Used, Assignment: Parallel, Purpose: Prevention, Randomization description: people Participating in this study are randomly assigned to two groups of ketamine and placebo. In this way, using a 6-sided dice, the samples are assigned to their groups. A number is written on each side, and each number is assigned to one of the blocks in the table, which shows the desired drug group. K K P K P 1 P P K P K 2 K K P P K 3 K P P K P 4 P P K P K 5 P K K K P 6, Blinding description: The patients are not aware of the type of study group and the selection of the patient, each patient's group and the type of medication received will be delivered by one of the researchers related to the patient. The anesthesiology technician in charge of the patient will not know the type of drug in order to reduce the confounding factors, so according to the two groups of injectable drugs, two types of similar syringes that have no specifications will be used and related medication will be prepared by the anesthesia assistant. 3 The effect of ketamine in the prevention of shivering after spinal anesthesia.. Intervention group: Ketamine injection. No - There is not a plan to make this available Justification or reason for not sharing IPD is The reason for this is due to the observance of ethical principles and the observance of the confidentiality of the patient's personal information.