Cognitive Impairment, Delirium
Conditions
Brief summary
Delirium is a syndrome of acute brain dysfunction involving attention and cognition that affects up to half of older hospitalized patients and 50%-75% of critically ill ICU patients, such that millions of patients worldwide experience this acute threat to their health and well being every year. One-third to half of critical illness survivors struggle with a dementia-like disorder similar in severity to moderate-to-severe traumatic brain injury or Alzheimer's Disease, and the only proven risk factor that is potentially modifiable is delirium in the ICU. Despite the frequency and impact of delirium in the ICU, little is known regarding the biological mechanisms that lead to this form of organ dysfunction during critical illness. A widely held hypothesis proposes that inflammation is regulated by the cholinergic system, and that this interaction plays a pivotal role whether delirium developments in the setting of acute illness. Acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) are enzymes that hydrolyze the neurotransmitter acetylcholine. Changes in the activity of these enzymes, which can be measured in whole blood, reflect altered regulation of circulating acetylcholine. AChE and BuChE activities have promise as both predictors of delirium (when found to be low at admission) and biomarkers of delirium (when low during serial measurement). Neither of these biomarkers, however, have been studied in the ICU setting where delirium risk is the highest. The current investigation, therefore will be the first to determine the validity of circulating AChE and BuChE activities as biomarkers of delirium during critical illness and subsequent cognitive impairment after discharge. This study will measure whole blood AChE and butyrylcholinesterase BuChE activities within the framework of the ICU Delirium and Cognitive Impairment Study Group's ongoing clinical trials in critically ill patients.
Interventions
None listed
Sponsors
DR. FRANZ KOHLER CHEMIE GMBH
Vanderbilt University Medical Center
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* English-speaking adults (\>18 years of age) treated for acute respiratory failure (with mechanical ventilation or non-invasive positive pressure ventilation \[NIPPV\]) and/or shock (with vasopressors) in a medical and/or surgical ICU at Vanderbilt University Medical Center enrolled in an ICU Delirium and Cognitive Impairment Study Group's clinical trials.
Exclusion criteria
for the parent studies are summarized below. No additional
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Delirium | During hospital stay until death or hospital discharge, whichever comes first, up to 30 days | Confusion Assessment Method for the ICU |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Global cognition | At 3, 6, and/or 12 months after hospital discharge up to 18 months after discharge | Neuropsychological battery |
Other
| Measure | Time frame | Description |
|---|---|---|
| Activities of daily living | At 3, 6, and/or 12 months after hospital discharge up to 18 months after discharge | Katz Index of Independence in Activities of Daily Living |
| Instrumental activities of daily living | At 3, 6, and/or 12 months after hospital discharge up to 18 months after discharge | Functional activities questionnaire |
| Quality of life and generic health status | At 3, 6, and/or 12 months after hospital discharge up to 18 months after discharge | EQ-5D |
| Coma | During hospital stay until death or hospital discharge, whichever comes first, up to 30 days | Richmond Agitation Sedation Scale |
Countries
United States
Outcome results
None listed