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Abstract Background: The Iowa Satisfaction with Anesthesia Scale (ISAS) was developed to assess the satisfaction of patients undergoing sedation with monitored anesthesia care. This study aimed to cross-culturally adapt the ISAS instrument and evaluate the acceptability, validity, and reliability of the proposed Brazilian version (ISAS-Br). Methods: The cross-cultural adaptation process involved translation, synthesis, back-translation, expert committee review, pre-testing, and final review of the ISAS-Br. A cross-sectional study was conducted, involving 127 adult individuals undergoing ambulatory surgeries with moderate/deep sedation. The acceptability, reliability, and construct validity of the scale were assessed. Results: The cross-cultural adaptation process did not require significant changes to the final version of the scale. The ISAS-Br demonstrated excellent acceptability, with a completion rate of 99% and an average completion time of 4.6 minutes. Exploratory factor analysis revealed three factors: emotional well-being, physical comfort, and anxiety relief, with respective composite reliability coefficient values of 0.874, 0.580, and 0.428. The test-retest reliability of the ISAS-Br, measured by the intraclass correlation coefficient, was 0.67 (95% confidence interval [95% CI] 0.42 to 0.83), and the Bland-Altman plot showed satisfactory agreement between the measurements. Conclusion: The proposed Brazilian version of the ISAS underwent successful cross-cultural adaptation according to international standards. It demonstrated good acceptability and reliability, regarding the assessment of temporal stability. However, the ISAS-Br exhibited low internal consistency for some factors, indicating that this instrument lacks sensitivity to assess the satisfaction of deeply sedated patients. Further studies are necessary to explore the hypotheses raised based on the knowledge of its psychometric properties. Background (ISAS care crossculturally cross culturally ISASBr. ISASBr Br . (ISAS-Br) Methods crosscultural cultural translation synthesis backtranslation, backtranslation back back-translation pretesting, pretesting pre testing, testing pre-testing Br. crosssectional sectional conducted 12 moderatedeep moderate deep assessed Results 99 46 4 6 4. minutes factors wellbeing, wellbeing well being, being well-being comfort relief 0874 0 874 0.874 0580 580 0.580 0428 428 0.428 testretest test retest ISASBr, Br, 067 67 0.6 95% 95 (95 [95 CI 042 42 0.4 0.83, 083 0.83 , 83 0.83) BlandAltman Bland Altman measurements Conclusion standards stability However properties (ISAS-Br 1 9 087 87 0.87 058 58 0.58 06 0. (9 [9 04 08 0.8 8 05 5 0.5 ( [