Dr Mohammad Nematshahi, Dr Mohsen Sahebanmaleki, Dr Zahra Moodi, Dr Hasan Enayati, Dr Atefeh Asade,
Volume 17, Issue 3 (9-2011)
Abstract
Abstract
Background and Aim: Postoperative shivering is one of the common problems after anesthesia and can cause many complications such as heart disease, increased intraocular pressure, increased intracranial pressure and other problems. Various methods and drugs have been used for the prevention of postoperative shivering. In this study, we have investigated the pretreatment effect of ondansetron and meperidine in reducing shivering after cesarean elective by spinal anesthesia.
Materials and Methods: In this double-blind study, 100 volunteered patients for cesarean elective using spinal were blocked and classified randomly into two groups. After the baby was born, 8 mg/kg ondansetron for the first group (O) and 0.4 mg/kg meperidine for the second group (M) was injected slowly. MAP, Heart rate and SPO2 were measured and recorded before the operation, during the operation and after the operation. The shivering or its absence was recorded for 20 minutes after the operation by a recovery nurse.
Results: The incidence of postoperative shivering was 10% in ondnasetron group and 24% in meperidine group. But there was no significant difference between the two groups.
Conclusion: There was not a significant difference between the effects of ondansetron and meperidne groups.
M. Sahebanmaleki, B. Ebrahimi, S. Eshaghi, M. Amiri, M. Moavensaiedi,
Volume 25, Issue 2 (3-2019)
Abstract
Aims: Shivering is an oscillating and involuntary activity of the muscles which increases the metabolic hyperthermia and is considered as a complication in neuraxial anesthesia. Shivering also increases the cardiopulmonary activity and oxygen consumption of the tissue. In this research project, different doses of magnesium sulfate in prevention of postoperative shivering in patients undergoing spinal anesthesia were investigated.Materials and Methods: In this double-blind randomized study, 99 patients with ASA classes 1 or 2 aged between 20 -80 years old who were under spinal anesthesia were selected. The patients were divided into 3 groups of 33 each with simple sampling method. During the operation and upon completion of surgery, the patients were controlled regarding the observable shivering for one hour by the researcher. The data were analyzed using SPSS software version 22. To ensure of the normal distribution of the data, the normality test of Kolmogorov Smirnov was used. The p-value was considered significant at < 0.05 level.
Results: The results showed that there was no significant difference between groups A and B regarding the frequency and intensity of occurrence of shivering (p = 0.374). Also, no significant difference was observed between group A and group C considering the frequency and intensity of occurrence of shivering (p = 0.631). Further, the frequency and intensity of occurrence of shivering between group B and group C was not significantly different (P=0.676).
Conclusion: The results indicated that a low dose of magnesium sulfate 20% (30mg/kg) is effective in the prevention of postoperative shivering in patients undergoing spinal anesthesia to the same degree that higher doses are.
Mohsen Saheban Maleki, Sepide Sedaghati Ansari, Fateme Rezaniazave, Alireza Talai,
Volume 27, Issue 3 (6-2021)
Abstract
Aims: Postoperative shivering is unpleasant and annoying for the patient, occurring in up to 65% of cases undergoing general anesthesia. Various mechanisms were suggested for postoperative shivering. Shivering after anesthesia can cause complications, such as cardiovascular conditions, bleeding, and infection. This study compared the effects of dexamethasone, pethidine, and ketamine on the prevention of shivering after general anesthesia.
Methods & Materials: In total, 164 patients with ASA classes one and two in the age range of 20-60 years under general anesthesia with orthopedic surgery, urology, and general surgery were included in the study. This study was a double-blind, randomized, placebo-controlled study. The study patients were divided into 4 groups of 41 subjects. After the induction of anesthesia and before surgery, in the first group, dexamethasone 0.15 mg/kg body weight, in the second group, ketamine 0.5 mg/kg, in the third group, pethidine 0.5 mg/kg, and in the fourth group, normal saline 0.9% were all given in 2 cc volume. After surgery, the examined patients were monitored for visible shivering by the researcher. The obtained data were analyzed using SPSS.
Findings: The frequency and severity of shivering were lower in the dexamethasone (P=0.009), pethidine (P=0.004), and the ketamine (P=0.000) groups, compared to the control group. Besides, there was a significant difference between each of these 3 groups and the controls. The frequency and severity of shivering in the dexamethasone group were not significantly different from those of the pethidine group (P=0.565). The frequency and severity of shivering in the dexamethasone and ketamine groups were not statistically significant (P=0.071). The frequency and severity of shivering in the pethidine group with ketamine were not statistically significant (P=0.063).
Conclusion: The obtained results indicated that dexamethasone, pethidine, and ketamine were effective in preventing postoperative shivering. There was no difference between these medications in the prevention of postoperative shivering.