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Background: The assessment of pain is particularly difficult in critical patients unable to self‐report or with cognitive impairment. In such cases, the use of scales which evaluate pain through patient behaviour is important.

Aims: To compare the behavioural responses to pain, measured on the Critical‐Care Pain Observation Tool (CPOT) scale, and the physiological responses prior to, during and after the positioning procedure in patients with invasive mechanical ventilation. We also sought to analyse whether there are differences in the CPOT scores between medical and surgical patients, and between conscious and unconscious patients.

Method: Pain scores were evaluated in 96 patients. The data gathering was carried out 1 min before, during and 10 min after the turning by means of the CPOT scale which includes four behavioural indicators, each indicator scored from 0 to 2. Likewise, mean arterial pressure …