Effect of Raised CBF During CEA on Cognition in DM Patients

This study is currently recruiting participants. (see Contacts and Locations)
Verified July 2013 by Columbia University
Sponsor:
Information provided by (Responsible Party):
Eric J. Heyer, MD, PhD, Columbia University
ClinicalTrials.gov Identifier:
NCT00597545
First received: January 9, 2008
Last updated: July 29, 2013
Last verified: July 2013

January 9, 2008
July 29, 2013
March 2007
June 2014   (final data collection date for primary outcome measure)
Neuropsychometric Changes [ Time Frame: Morning of surgery and post-operatively at 1 day, 1 month, and 6 months ] [ Designated as safety issue: No ]
Battery of neuropsychometric tests to evaluate a variety of cognitive functions.
Increase or decrease in cognitive function [ Time Frame: prior to surgery, 1 day post surgery, 1 month post surgery, 6 months post surgery ] [ Designated as safety issue: No ]
Complete list of historical versions of study NCT00597545 on ClinicalTrials.gov Archive Site
Not Provided
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Effect of Raised CBF During CEA on Cognition in DM Patients
Effect of Augmentation of Cerebral Blood Flow on Neuropsychometric Performance After Carotid Endarterectomy in Type II Diabetic Patients

The purpose of this study is to determine if we can reduce the incidence of cognitive dysfunction — difficulty in performing certain pencil-paper, memory, finger dexterity and thinking type of tasks called neuropsychometric tests — in patients with adult onset diabetes mellitus (DM) undergoing surgery on the carotid artery (CEA).

We hypothesize that cognitive dysfunction can be decreased in patients with type II DM by augmenting cerebral blood flow with a shunt during carotid endarterectomy compared to patients with Type II DM who are treated with "conventional" management in which a shunt is placed only if the electroencephalogram (EEG) indicates cerebral ischemia.

Based on previous clinical studies, we have found that patients with diabetes mellitus (DM) who are having carotid endarterectomy (CEA) have a four-fold higher incidence of cognitive dysfunction, 1 day and 1 month after surgery, than a control group of elderly diabetic patients having spine surgery.

We hypothesize that this increased incidence is due to sub-cortical ischemia associated with the clamping of the ipsilateral carotid artery, because intra-operatively we rarely see EEG changes, or a significant number of emboli upon clamping or unclamping the carotid artery, or new cortical lesions of ischemia by MRI after surgery. In order to decrease cognitive dysfunction in patients with DM, we propose to randomize them to either i) have a shunt placed across the surgical site assuming it is surgically feasible or ii) be treated by "conventional" management during which time a shunt is placed only in the unlikely event of significant cortical ischemia determined by EEG, which occurs in about 5% of all cases.

The purpose of this study is to determine if patients with adult-onset diabetes mellitus having the surgical procedure called carotid endarterectomy benefit from increasing blood flow to the brain with a "shunt". A "shunt" is a tube inserted below and above the surgical area at the time when the carotid artery is clamped to allow the surgeon to work in a bloodless field and to supplement blood flow to the brain. Benefit is measured after surgery by comparing performance on a battery of cognitive tests, which test your ability to perform pencil-paper, memory and finger dexterity tests, to performance before surgery.

Patients in the shunt group whom the surgeon at the time of surgical exposure considers too technically difficult to shunt, will not have a shunt inserted but will be treated statistically as if they were shunted (intention to treat). Follow-up evaluations will be performed 1 day, and 1 and 6 months after surgery so that the long-term effect of shunting can be evaluated.

Cerebral injury will be determined in two ways.

First, all patients will be evaluated using a battery of neuropsychometric tests before and after surgery. Patients admitted to the Irving Clinical Research Center (CRC) will have their tests 1 day before, and 1 day, and 1 and 6 months after surgery. Those coming into the hospital on the day of surgery, "Same Day", will be evaluated on the day of surgery. They will be evaluated 1 day, and 1 and 6 months after surgery.

Preoperative neurological and neuropsychological evaluation will be performed. The neuropsychometric tests are not intended to be diagnostic of specific neuropsychiatric disorders, but rather are designed to demonstrate general neuropsychological pathology. These tests can be divided into four types: (1) an evaluation of language, (2) an evaluation of speed of mental processing, (3) an evaluation of ability to learn using a list of words, and (4) an evaluation of visual perception requiring a patient to copy a complex figure. Before the battery is administered we will assess each patient's level of pain while sitting and standing using a 10 point Visual Analog Scale and gauge their mood with a series called the Wong/Baker Faces Rating scale. Patients having spine surgery may have significant pain before surgery which might impair their performance.

We will also be measuring Quality of Life (QOL) in all enrolled patients.

This will be done using two well-known examinations (Telephone Interview for Cognitive Status (TICS) and Centers for Disease Control and Prevention Health-Related Quality-of-Life 14Item Measure (CDC HRQOL14)) and a series of questions investigating how well patients are able to perform activities of daily living (ADLs) and instrumental activities of daily living (IADLs). These tests will be given at two time points, once before the surgery and then one month after surgery. We will look for changes in quality of life that may correlate with neuropsychometric test performance.

Second, peripheral serum samples will be drawn before induction, before crossclamping the carotid artery, 15 minutes after crossclamping the carotid artery and 24 hours after surgery.

Since the purpose of this study is to determine if a change in "conventional" management will improve patient's ability to perform our battery of neuropsychometric tests, we will randomly assign patients to either receive a "shunt" prophylactically if the surgeon determines that it is technically safe, even if conventional management does not indicate its necessary, or a "shunt" only if it is indicated by EEG, "conventional" management. Subjects in the prophylactic group will receive a shunt even when by standard criteria they would not need to receive one. Randomization will be performed in blocks of four patients each using a randomization table. Using "block" randomization we will increase the probability of an equal number of patients "shunted" or not shunted. The surgeon will be told which group the patient has been randomized into after induction and prior to clamping the carotid artery.

Interventional
Not Provided
Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Single Group Assignment
Masking: Double Blind (Subject, Investigator)
Primary Purpose: Prevention
  • Carotid Artery Disease
  • Carotid Artery Stenosis
  • Diabetes
  • Cognitive Dysfunction
Procedure: Shunt
We will randomly assign patients to either receive a "shunt" prophylactically if the surgeon determines that it is technically safe, even if conventional management does not indicate it is necessary, or a "shunt" only if it is indicated by EEG, "conventional" management. Subjects in the prophylactic group will receive a shunt even when by standard criteria they would not need to receive one. Randomization will be performed in blocks of four patients each using a randomization table. Using "block" randomization we will increase the probability of an equal number of patients "shunted" or not shunted. The surgeon will be told which group the patient has been randomized into after induction and prior to clamping the carotid artery.
  • Conventional Shunt
    Subjects will receive a shunt only if it is indicated by EEG, "conventional" management.
    Intervention: Procedure: Shunt
  • Experimental: Prophylactic Shunt
    Subjects in the prophylactic group will receive a shunt even when by standard criteria they would not need to receive one.
    Intervention: Procedure: Shunt
Heyer EJ, Mergeche JL, Bruce SS, Connolly ES. Inflammation and Cognitive Dysfunction in Type 2 Diabetic Carotid Endarterectomy Patients. Diabetes Care. 2013 Jun 4. [Epub ahead of print]

*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Recruiting
400
June 2014
June 2014   (final data collection date for primary outcome measure)

Inclusion Criteria:

  • ability to speak English
  • no history of permanent neurological impairment, Axis I psychiatric diagnosis or drug abuse.
  • scheduled for elective carotid endarterectomy for treatment of carotid artery stenosis.
  • diagnosed with diabetes mellitus or HbA1c value greater than 10%

Exclusion Criteria:

  • younger than 18 yrs.
Both
18 Years and older
No
Contact: Kaitlin A Mallon, BA 212-305-8949 km2954@cumc.columbia.edu
Contact: Eric Heyer, M.D., Ph.D. 212-305-9072 ejh3@columbia.edu
United States
 
NCT00597545
AAAC3837
No
Eric J. Heyer, MD, PhD, Columbia University
Columbia University
Not Provided
Principal Investigator: Eric J Heyer, M.D., Ph.D. Columbia University
Columbia University
July 2013

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP