1 / 21

Cognitive Trajectories after Postoperative Delirium

Cognitive Trajectories after Postoperative Delirium. Meredith Cook – PharmD Candidate Mercer University COPHS August, 2012. Relevance. Many patients do not return to their preoperative level of cognition within 3 months of cardiac surgery. Risk factors

trang
Télécharger la présentation

Cognitive Trajectories after Postoperative Delirium

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cognitive Trajectories after Postoperative Delirium Meredith Cook – PharmD Candidate Mercer University COPHS August, 2012

  2. Relevance • Many patients do not return to their preoperative level of cognition within 3 months of cardiac surgery. • Risk factors • Older age, lower education level, presence of 1 or more coexisting conditions • Delirium affects up to ¾ of patients following cardiac surgery • Associated with adverse outcomes (functional decline, increased healthcare costs, and/or death)

  3. Rationale/Methods • Conducted by Saczynski, J.S., et al. at two academic medical centers and one VA hospital • Inclusion criteria: 60 years of age or older who were planning to undergo CABG or valve replacement • Patients follow up to 1 year post-op • Funded by: Harvard Older Americans Independence Center and others

  4. Rationale/Methods • Preoperative Assessment • Demographics, behavioral factors, functional ability (Katz Index of Independence in ADLs) coexisting conditions, and cognitive function (MMSE) • Postoperative Assessment • Began on post-op day 2 and continuing daily until discharge (MMSE, digit-span test, CAM, and Delirium Symptom Interview) • After discharge, patients were interviewed in person at 1, 6, and 12 months

  5. Rationale/Methods • 24.4% of the daily delirium assessments were missing (due to staff or patient unavailability – ie: weekend staffing) • The missing assessments did not differ significantly between patients who had delirium and those who did not • All patients underwent at least 1 delirium assessment on post-op day 2 or 3 • Charlson co-morbidity index was also calculated

  6. Statistical Analysis • Baseline characteristics – chi-square test for categorical variables and analysis of variance for continuous variables • MMSE scores over time – hierarchical linear regression model • MMSE scores were adjusted for age, educational level, sex, race/ethnic group, score on Charlsoncomorbidity index, presence or absence of stroke or TIA, surgery type, and hospital

  7. Statistical Analysis • Sensitivity Analyses • Baseline differences in MMSE scores according to delirium status • Duration of delirium • Excluded 7 patients who had a stroke postoperatively

  8. Results • 225 patients • Average age: 73 +6.7 (range: 60-90) • ¼ female • Most were white, non-Hispanic

  9. Results • Postoperative delirium developed in 46% of patients • Lasted 1-2 days in 65%; 3 or more days in 35% • Delirium patients were significantly older, less educated, more likely to be women, and less likely to be white • Also more likely to have a history of stroke or TIA and a higher average score on the Charlson co-morbidity index and lower level of preoperative cognitive function

  10. Results: Cognitive Function Scores • Avg. MMSE before surgery: 26.9 • Postoperative day 2: -4.6 points (p<0.001) • Postoperative days 3-5: +1 point (p<0.001) • Improvement slowed considerably from day 6 – day 183 • No significant improvement from day 183 – day 365

  11. Results: Cognitive Trajectories According To Delirium Status • Post-op delirium patients had significantly lower MMSE scores pre-operatively than those without delirium (25.8 vs. 26.9, p<0.001) • Greater decline in cognitive function immediately following surgery in those who developed delirium (-7.7 points vs. -2.1 points, p<0.001)

  12. Results: Cognitive Trajectories According To Delirium Status • No delirium – returned to baseline ~1 month postoperatively • With delirium – had NOT returned to baseline by 1 year postoperatively

  13. Sensitivity Analysis • Longer duration of delirium was associated with a more significant drop in MMSE score immediately following surgery and slower recovery in the 1 year post-op period • (> 3 days vs. < 3 days) • These results were similar when patients were excluded who had a stroke post-op and when MMSE scores were ranked to address non-normal distribution (no data was given in the study)

  14. Discussion • Delirium after cardiac surgery is associated with an initial decline in cognitive function, followed by an extended period of impairment • After MMSE adjustment for baseline characteristics, the average MMSE scores did not differ significantly in patients with and those without delirium at 6 months and 1 year post-op

  15. Discussion • Delirium may have long-term effects on cognitive function following cardiac surgery • Post-op delirium associated with prolonged cognitive dysfunction? • Clinically significant – risk of delirium can be predicted pre-op (delirium is preventable)

  16. My Conclusions • Does risk outweigh benefits? • Educate patients on possible risk of decline in cognitive function • Thoroughly test before surgery to assess pre-op cognitive abilities • Identify high-risk patients

  17. References • Saczynksi, Jane S. Cognitive Trajectories after Postoeprative Delirium. NEJM. July 5, 2012; 367:30-9.

More Related