Cognitive Dysfunction Clinical Trial
Official title:
The Influence of Cognitive Decline on Quality of Life After Coronary Bypass
During the last decades improvements in operative techniques and perioperative care have led
to a steady decline in mortality after cardiac surgery. Good survival rates have been shown
repeatedly although elderly patients have an increased risk for prolonged hospital stay and
postoperative complications such as neurological and pulmonary problems. Post-operative
cognitive decline (POCD) is common after cardiac surgery and although this cognitive decline
can be subtle, in elderly vulnerable patients even a small decline can have important
consequences such as a decreased quality of life and loss of independence. Recent studies
among patients after coronary artery bypass grafting (CABG) found that the incidence of POCD
varied between 30-60% depending on cognitive tests, time of assessment and patient
populations.
Cognitive and physical impairment frequently co-occur in older people. The association
between cognitive impairment and functional disability has been investigated in several
studies, which demonstrated that cognitive decline is associated with functional disability,
also after cardiac surgery. One method for estimation of patients' physical performance is to
evaluate sarcopenia. Sarcopenia is defined as a syndrome characterised by progressive and
generalised loss of skeletal muscle mass and strength, leading to an increased risk of
adverse outcomes such as physical disability, poor quality of life and death. Data on the
prevalence of sarcopenia in community-dwelling residents or nursing-homes are widely
available, but little is known on (elderly) hospitalized patients after cardiac surgery. The
aim of this study is to evaluate the association between post-operative cognitive decline,
quality of life (QoL) and sarcopenia in adult patients after coronary artery bypass grafting.
The investigators hypothesize that a decreased postoperative QoL is mainly explained by POCD,
therefore the primary research question of this study is: What is the influence of
post-operative cognitive decline on QoL after CABG? The secondary research question is: Is
there an association between postoperative sarcopenia and a decreased postoperative QoL?
Study design:
The investigators will conduct a prospective observational cohort study to evaluate QoL,
cognitive decline and sarcopenia in adult patients after coronary artery bypass grafting. The
investigators hypothesize that cognitive decline is more associated with QoL than sarcopenia.
QoL will be measured using the RAND-36 questionnaire. Cognitive functioning will be measured
using several cognitive tests and sarcopenia will be evaluated by measuring muscle mass and
muscle strength. The investigators will explore different subgroups according to age
including elderly patients (e.g. patients aged 80 years or older at the time of surgery),
according to a prolonged stay at the Intensive Care Unit (>24 hours) and according to
comorbidities (i.e. diabetes, pulmonary disease, renal failure).
Data collection method:
Routinely, patients planned for CABG are admitted to the cardiothoracic ward one day before
surgery. On the day of admittance (one day before surgery) patients will be asked to perform
a simple brief battery of 4 computerized tests of cognitive function. At the same time,
muscle mass will be assessed using a bioelectrical impedance instrument (BIA) and muscle
strength will be assessed using a handgrip strength device. Patients wil also be asked to
fill-in a quality of life questionnaire (RAND-36 health survey). Three days after surgery
assessments of cognitive functioning, muscle mass and muscle strength will be repeated. Six
months after surgery patients will be visited at home where cognitive functioning, muscle
strength, muscle mass and QoL will be reassessed.
Study parameters:
1. The primary outcome will be quality of life assessed using the RAND-36 version 2
questionnaire. The questionnaire is widely validated, has a good reliability and
includes eight health domains: physical functioning, social functioning, role
limitations due to physical health problems, role limitations due to emotional problems,
mental health, vitality, pain and general health perception. Outcomes at each dimension
will be defined on a scale between 0 and 100; a higher score is equivalent to better
health.
2. Cognitive function will be assessed using the brief computerised cognitive test battery
(cogstate Ltd, Melbourne, Vic., Australia). This set of tests consists of the detection
task, the identification task, the one card learning task and the one back task
assessing psychomotor speed, selective attention, visual learning and working memory,
respectively. For each postoperative cognitive test, a standardized change in Z-score
will be calculated from the difference between the postoperative and baseline score. Of
all individual tests the standardized Z-scores will be summed up to generate a composite
Z-score. POCD is defined as a Z-score < -2 in two or more individual tasks or a
composite Z-score of < -2.
3. To detect sarcopenia the European Working Group on Sarcopenia in Older People (EWGSOP)
recommends measurement of both the presence of low muscle mass and low muscle function.
Bioelectrical impedance analysis (BIA) can be used for estimation of muscle mass and
assessment of handgrip strength can be used for estimation of muscle function.
- Bio-impedance analysis: BIA estimates the volume of fat and lean body mass. For the
calculation of muscle mass we will use the measurements Resistance (RZ), Reactance
(Xc) and Phase Angle (Pa) obtained with BIA. These values will be computed by
empirically formulated equations based on healthy people with a hydration of the
lean body mass around 73%, leading to values for muscle mass (MM), body cell mass
(BCM), fat mass (FM) and fat free mas (FFM). Bioelectrical impedance analysis will
be performed using a BIA 101 Anniversary edition (AKERN, Florence, Italy). Cut-off
values based on normative populations of men and women ≥ 60 years and recommended
by the EWGSOP will be used as reference for our study population.
- Handgrip strength: Muscle strength of the upper extremities will be tested with a
hand dynameter measured using the dominant hand. To become familiar with the test,
patients will be allowed to perform one practice-test, and then three consecutive
tests will be carried out with one minute rest between tests. Only the highest
score of the handgrip test will be used for analysis; results will be compared with
the reference values recommended by the EWGSOP guidelines.
Additional data:
Additionally, routinely collected variables such as prognostic factors at baseline, data on
the surgical procedure and the occurrence of postoperative complications will be recorded as
well. Baseline demographic data will include age, gender, body mass index, education level,
log EuroSCORE I and co-morbidity such as diabetes (oral therapy or insulin dependent
diabetes), pulmonary disease (prolonged use of steroids or other lung medication), arterial
vascular disease (peripheral or abdominal vascular pathology or operation due to arterial
vascular disease, renal disease (a reduced renal function prior to surgery with an estimated
Glomerular Filtration rate (eGFR) <60 ml/min/1.73 m2) and ventricular function (left
ventricular ejection fraction: good >50%, moderate 30-50% or poor <30%). The log EuroSCORE I
is a widely used risk stratification system for adult cardiac surgery patients which
estimates a mortality risk for each individual patient. Data on surgical procedures will be
obtained and include the number of grafts and use of cardiopulmonary bypass.
Postoperative complications include:
- Delirium during hospital admittance defined as:
1. A delirium observation scale score ≥ 3 at hospital ward and/or
2. A positive confusion assessment method (CAM)-ICU score at the ICU and/or
3. Diagnosis confirmed by a psychiatrist or geriatrist according to the Diagnostic and
Statistical Manual (DSM)-IV criteria
- Myocardial infarction (MI) in the postoperative period. Myocardial infarction associated
with CABG (within 48 hours after CABG) is arbitrarily defined by elevation of cardiac
biomarker values >10 x 99th percentile upper reference limit (URL) in patients with
normal baseline cardiac troponin values. In addition, either (I) new pathological Q
waves or new LBBB, or (II) angiographic documented new graft or new native coronary
artery occlusion, or (III) imaging evidence of new loss of viable myocardium or new
regional wall motion abnormality. After 48 hours, the standard definition of myocardial
infarction is appropriate. The following criteria meets the diagnosis for MI: detection
of a rise and/or fall of cardiac biomarker values, preferably cardiac troponin, with at
least one value above the 99th percentile URL and in addition, either (I) symptoms of
ischaemia, or (II) new or presumed new significant ST-segment-T wave (ST-T) changes or
new left bundle branch block (LBBB), or (III) development of pathological Q waves in the
ECG, or (IV) imaging evidence of new loss of viable myocardium or new regional wall
motion abnormality or identification of an intracoronary thrombus by angiography or
autopsy
- Surgical re-exploration within 30 days after surgery: thoracotomy due to bleeding,
cardiac tamponade or graft failure
- Deep wound infection within 30 days after surgery: when deeper tissues are affected
(muscle, sternum and mediastinum) and one or more of the following three criteria are
met:
1. surgical drainage or refixation
2. an organism is isolated from culture of mediastina tissue or fluid
3. antibiotic treatment because of a sternal wound
- Stroke: an acute neurological event within 72 hours after surgery with focal signs and
symptoms and without evidence supporting any alternative explanation. Diagnoses of
stroke requires confirmation by a neurologist
- Renal failure within 30 days after surgery when one or more of the following criteria
are met:
1. renal replacement therapy (dialysis or CVVH) which was not present preoperatively
2. highest postoperative creatinine level > 177 μmol/L and a doubling of the
preoperative value (the preoperative creatinine value is the value on which the
EuroSCORE is calculated)
Additional outcomes will be, stay at the Intensive Care Unit (in hours) and discharge
destination (i.e. home, nursing home or other healthcare facility).
Data management:
Data will be recorded using OpenClinica and transferred for analysis using Statistical
Package for the Social Sciences (SPSS) version 22 (IBM, Chicago, IL). All study subjects will
receive a unique study subject identification (ID). Only a researcher with "study director"
account properties in OpenClinica will be able to link study subject ID to patient number.
Sample size assessment:
The sample size calculation is based on the hypothetical association between postoperative
cognitive decline and QoL. Cognitive decline is assumed to be the independent variable and
quality of life as the dependent variable. Data from a previous study among CABG-patients
demonstrated POCD in 26% of the included patients at three months after surgery. POCD was
defined as a Z-score < -2 in two or more individual tasks, or a composite Z-score of < -2,
and the standard deviation (SD) for POCD in this study was 7.4. Another study on assessment
of QoL after cardiac events including 6384 patients reported standard deviations of 10.3 and
11.0. With a minimal clinical important difference set at 5 points for change in QoL (e.g.
the difference between the postoperative and baseline score), a sample size of 123 patients
wil be required for a two-tailed test at an α of 0.05 and power of 80% to find an association
between POCD and QoL. The investigators plan to include 140 patients to account for missing
data. The inclusion will start in October 2018 and is expected to be completed by the end of
July 2019.
Data analysis:
Characteristics of patients will be presented as proportions (with percentages) for
dichotomous variables and as means (with standard deviations) or medians (with interquartile
ranges) for continuous variables depending on normality. Differences between baseline and 3
days and 6 months follow-up of QoL, POCD and sarcopenia will be evaluated using paired
t-tests or Wilcoxon signed rank test when appropriate.
Linear regression will be used to evaluate the association between POCD and change in QoL.
First, unadjusted univariate regression analyses of POCD, sarcopenia and potential
confounders will be conducted. The following comorbidities will be considered as potential
confounders: arterial vascular disease, BMI, renal disease, ventricular function.
Additionally, the following postoperative complications will also be evaluated as potential
confounders: delirium, stroke and surgical re-exploration.
Multivariable linear regression analysis will be used to evaluate the association of
cognitive decline with sarcopenia as covariate, while adjusting for confounding factors. Age
will be forced into the multivariable model as it is considered a covariate based on
literature, and sarcopenia measured by muscle strength (handgrip test) and muscle mass (BIA)
will also be forced into the model as these will also be considered covariates. We will use a
p < 0.25 threshold for inclusion of potential confounding variables in the multivariable
model, which will be constructed using forward stepwise regression by adding blocks of
variables. The multivariable model with POCD as independent variable and QoL as dependent
variable will be adjusted for sarcopenia, as covariates. Assumptions will be checked using
the appropriate tests. All tests will be performed two-sided and variables with p-values of
less than 0.05 will be considered statistically significant.
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