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Pain assessment in Intensive Care Units (ICU) can be performed based on validated instruments as the Behavioral Pain Scale (BPS). Despite the existence of this clinical score, there is no Brazilian version of it to assess critically ill patients. This study aimed to translate the BPS into Brazilian Portuguese, verify its psychometric properties (reliability, validity, and responsiveness) and the correlation between pain measured and heart rate (HR), blood pressure (BP), Ramsay, and RASS scores.Pain intensity by using Brazilian BPS version, HR, and BP were observed by 2 investigators during 3 different moments: at rest; during eye cleaning (EC); and tracheal suctioning (TS) in 15 adult subjects sedated and mechanically ventilated. Sedation level, severity of disease, and use of sedatives and analgesic drugs were also recorded.There was a high responsiveness coefficient (coefficient = 1.72) and pain was significantly higher during tracheal suctioning (P ≤ 0.003) and eye cleaning (P ≤ 0.04) than at rest. It was evidenced a low reliability and no significant correlation between translated BPS scores and physiological parameters during tracheal suctioning, sedation scales, flow of the sedatives drugs, or with the general health status (P > 0.07).Brazilian BPS has high responsiveness and capacity to detect pain intensity in different situations in the ICU routine. This preliminary study proved the feasibility and importance of valid this scale in Brazil in order to improve critically ill patients care.