A significant proportion of patients hospitalized in intensive care units (ICUs) require mechanical ventilation, and the treatments applied during this process may cause pain. Pain is defined as an unpleasant sensory and emotional experience associated with actual or potential tissue damage. Although it is associated with delirium and agitation, pain is often an overlooked symptom in ICU patients, and a large proportion of mechanically ventilated patients continue to experience moderate to severe pain. The most common type of pain in critically ill patients is nociceptive pain, which may result from invasive procedures such as tracheal intubation, catheter insertion, aspiration, wound care, and patient repositioning. Additionally, the noisy and unfamiliar ICU environment and patients' inability to express themselves may further increase the perception of pain.

Regular assessment of pain is associated with many positive outcomes, including more effective pain management, appropriate use of analgesic and sedative medications, and shorter duration of mechanical ventilation and ICU stay. Although self-reporting of pain is considered the gold standard, many patients receiving mechanical ventilation are unable to communicate their pain. Therefore, various behavioral pain assessment scales are used to evaluate pain in ICU patients. One of these tools is the Behavioral Indicators of Pain Scale (Escala de Conductas Indicadoras de Dolor - ESCID), which was developed to assess pain in critically ill adult patients receiving mechanical ventilation who are unable to communicate. However, a Turkish version of this scale has not yet been developed. Therefore, the aim of this study is to translate the ESCID scale into Turkish, perform its cultural adaptation, and test the validity and reliability of the Turkish version.

Inclusion Criteria:

• Individuals aged 18 years and older
• Patients who are intubated, receiving mechanical ventilation, and unable to establish verbal communication (Glasgow Coma Scale score <14)
• Patients who have been hospitalized in the intensive care unit for at least 24 hours

Exclusion Criteria:

• Presence of postoperative complications
• Hemodynamic instability
• History of diagnosed cognitive or psychiatric disorders
• History of epilepsy or use of neuromuscular blocking agents
• History of spinal cord injury affecting motor function of all four extremities
• Individuals with a Richmond Agitation-Sedation Scale (RASS) score of -5 (unresponsive)
• Cases with suspected brain death