Postoperative pain after cardiac surgery: neurobiological basis and treatment

Introduction. Despite the evolution of surgical techniques, pain continues to be one of the most frequent disorders in the postoperative period of cardiac surgery (CS), leading to the appearance of complications in the acute period and impairment of quality of life due to the appearance of chronic pain. In this narrative review, we aim to analyze the prognostic factors for the appearance of postoperative pain after CS, to locate and quantify the severity of neuropathic pain, and determine the most appropriate assessment methods in these patients. Development. Postoperative pain in CS is a complex pain, which associates neuropathic, somatic and visceral components. Its origin is multifactorial; factors depending on the patient, the preoperative symptoms and the type of intervention, as well as sequelae derived from the surgery itself, determine the variability in its manifestation. Multiple studies have tried to identify the risk factors for its development, but the quantification of pain is limited by the subjective perception of the patients. Conclusions. Neurologists can play a relevant role in the differentiation of the different types of pain after CS, thanks to the understanding of its neurobiological bases, properly handling neuromodulators that control the neuropathic component of pain and collaborating in the indication of invasive techniques, necessary occasionally in the management of these patients.