Open AccessThe Impact of Postoperative Pain on the Development of Postoperative Delirium
Author(s) -
Eileen P. Lynch,
Marissa A Lazor,
Janice E. Gellis,
John Orav,
Lee Goldman,
Edward R. Marcantonio
Publication year - 1998
Publication title -
anesthesia and analgesia/anesthesia and analgesia
Language(s) - English
Resource type - Journals
eISSN - 1526-7598
pISSN - 0003-2999
DOI - 10.1097/00000539-199804000-00019
Subject(s) - medicine , delirium , anesthesia , opioid , observational study , incidence (geometry) , population , pain assessment , prospective cohort study , physical therapy , surgery , intensive care medicine , pain management , physics , receptor , environmental health , optics
We performed a prospective observational study to examine the role of postoperative pain and its treatment on the development of postoperative delirium. Pain was measured in direct patient interviews using a visual analog scale (VAS) and was assessed for pain at rest, pain with movement, and maximal pain over the previous 24 h. Postoperative delirium was diagnosed during these interviews by using the confusion assessment method (CAM) and/or by using data from the medical record and the hospital's nursing intensity index. The method of postoperative analgesia, type of opioid, and cumulative opioid dose were also recorded. After controlling for known preoperative risk factors for delirium (age, alcohol abuse, cognitive function, physical function, serum chemistries, and type of surgery), higher pain scores at rest was associated with an increased risk of delirium over the first 3 postoperative days (adjusted risk ratio 1.20, P = 0.04). Pain with movement and maximal pain were not associated with delirium. Method of postoperative analgesia, type of opioid, and cumulative opioid dose were not associated with an increased risk of delirium. We conclude that more effective control of postoperative pain reduces the incidence of postoperative delirium.