Advancements in Perioperative Pain Management: The Role of Perfusion Index as a Continuous Non Invasive Measure

Pain management in the perioperative setting is crucial for patient comfort and optimising surgical outcomes. Poorly managed pain will trigger deleterious physiological effects, such as tachycardia, hypertension, and elevation of stress hormones, which can hinder recovery and potentially lead to chronic pain syndromes. Classic methods of evaluating pain, such as observations of Heart Rate (HR), Blood Pressure (BP), and pain scores using a subjective rating system, are unreliable because they depend on factors related to non painful stimuli. The Perfusion Index (PI) is a novel tool proposed to continuously and non invasively evaluate peripheral flow and sympathetic activation in response to painful stimuli. This review consolidates current evidence on PI as a dynamic, objective indicator of nociception in real-time clinical settings. It highlights its potential to bridge the gap between physiological monitoring and subjective pain assessment. This review examines the physiological basis of PI and its role in assessing pain and analgesia. Immediate feedback on peripheral perfusion offered by PI can assist anaesthesiologists in modifying their analgesic interventions, enhancing pain control, and reducing opioid consumption. Incorporation of PI into practice may lead to advances in individualised pain management strategies, particularly for high-risk patients.