<![CDATA[Post-spinal anesthesia shivering increases oxygen consumption by 400–500% and disrupts patient recovery. This study aimed to analyze the differences in effectiveness between Blanket Warmer and Pethidine in reducing shivering based on the Wrench Scale. The study used a quasi-experimental design with a post-test only control group approach in the PACU Room of RSD Kalisat Jember from April to May 2026. The sample included 30 post-spinal anesthesia patients who experienced shivering, divided into two groups: 15 patients received a Blanket Warmer at 40°C for 15 minutes, and 15 patients received 25 mg of intravenous Pethidine. Data analysis was performed using the Mann-Whitney U test and Chi-Square test. The results showed that Pethidine was more effective than the Blanket Warmer with an average score reduction of 2.13 vs. 1.73 points (p=0.035), effectiveness rate of 100% vs. 66.7% (p=0.014), and faster onset (6.9 vs. 11.8 minutes). Pethidine was associated with mild side effects (sedation 26.7%, nausea 20%, Meanwhile, the Blanket Warmer is safe without side effects. In conclusion, Pethidine is more effective for severe shivering, whereas the Blanket Warmer is safer for mild to moderate shivering. The choice of intervention needs to be adjusted according to the patient's risk stratification. ]]>
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