Shivering and body pain
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Shivering and Body Pain: Insights from Recent Research
Postoperative Shivering and Pain: Causes and Mechanisms
Postoperative shivering is a common complication that can significantly impact patient comfort and recovery. It is often associated with postoperative pain and can be categorized into thermoregulatory and nonthermoregulatory shivering. Thermoregulatory shivering is primarily caused by hypothermia due to anesthesia-induced inhibition of thermoregulation, while nonthermoregulatory shivering can be triggered by postoperative pain Horn1999Alfonsi2003Alfonsi2001.
Impact of Pain on Shivering
Research indicates that postoperative pain can facilitate nonthermoregulatory shivering. A study on patients undergoing knee surgery found that intra-articular lidocaine significantly reduced pain and prevented shivering, whereas intravenous lidocaine did not have the same effect . This suggests that effective pain management can play a crucial role in mitigating shivering.
Pharmacological Interventions for Shivering and Pain
Parecoxib
Parecoxib, a COX-2 inhibitor, has been shown to reduce both the incidence and severity of postoperative shivering. In a study involving patients undergoing minor urological surgeries, those who received parecoxib had significantly lower shivering and pain intensity scores compared to the placebo group . This dual effect highlights the potential of parecoxib in managing both shivering and pain.
Tramadol and Ketamine
Intravenous tramadol and low-dose ketamine have also been effective in reducing the incidence and intensity of shivering. A study on cesarean section patients under spinal anesthesia found that both drugs significantly reduced shivering compared to saline, with no significant differences in neonatal outcomes or perioperative complications . These findings support the use of tramadol and ketamine as prophylactic treatments for shivering.
Physostigmine, Meperidine, and Clonidine
Physostigmine, meperidine, and clonidine have been compared for their efficacy in preventing postanesthetic shivering. Physostigmine was found to be as effective as meperidine and clonidine, suggesting that cholinergic systems play a role in the control of shivering . These drugs work by reducing the shivering threshold temperature, thereby preventing the onset of shivering.
Non-Pharmacological Interventions
Active heating methods, such as forced-air warming and heated intravenous fluids, have been shown to maintain normothermia and reduce shivering levels. A randomized controlled trial demonstrated that patients who received these interventions had higher thermal comfort and lower shivering levels compared to the control group . However, these methods did not significantly affect postoperative pain, nausea, or vomiting.
Conclusion
Effective management of postoperative shivering and pain requires a combination of pharmacological and non-pharmacological interventions. Drugs like parecoxib, tramadol, ketamine, physostigmine, meperidine, and clonidine have shown efficacy in reducing shivering and pain. Additionally, active heating methods can help maintain normothermia and improve patient comfort. Understanding the interplay between pain and shivering is crucial for optimizing postoperative care and enhancing patient recovery.
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