Hippocampal atrophy but not white-matter changes predicts the long-term cognitive response to cholinesterase inhibitors in Alzheimer’s disease
- Yu-Wen Cheng†1,
- Ta-Fu Chen†1,
- Ting-Wen Cheng1,
- Ya-Mei Lai1,
- Mau-Sun Hua2,
- Ya-Fang Chen3Email author and
- Ming-Jang Chiu1, 2Email author
© Cheng et al. 2015
Received: 2 August 2015
Accepted: 13 October 2015
Published: 23 November 2015
This study aimed to investigate the feasibility of predicting the long–term effects of cholinesterase inhibitors (ChEI) with common clinical neuroimaging parameters of Alzheimer’s disease, including medial temporal lobe atrophy (MTA) and white matter hyperintensity (WMH).
A cohort of 353 patients with very mild to moderate Alzheimer’s disease received cholinesterase inhibitors and were followed for a median of 46.6 months. Baseline clinical data, including age, educational level, Clinical Dementia Rating (CDR), Taiwanese Mental State Examination (TMSE), and visual scoring for MTA and WMH were tested as possible predictive factors that influence the survival from a TMSE decline of at least 3 points.
During the follow-up period, 162(46 %) patients had a significant TMSE decline. Patients with age-adjusted prominent MTA had a significantly shorter TMSE-decline free interval than those without (43.4 ± 4.5 months vs. 68.2 ± 9.5 months, log rank test p-value =0.001). However, the severity of WMH does not significantly influence cognitive outcomes. Cox regression analysis identified that younger age at the time of starting ChEI (p < 0.0005) and higher total MTA scores (p = 0.002) predict a more rapid TMSE decline under ChEI therapy.
Younger age at the time of starting ChEI and higher visual scoring of MTA may imply a more advanced Alzheimer’s pathology. WMH load is not a prognostic indicator of treatment response to ChEI.
Cholinesterase inhibitors (ChEIs) are the only currently available medications that may modestly decrease the cognitive impairment in patients with mild to moderate Alzheimer’s disease (AD) [1–3]. However, the variable response between patients, relatively high long-term costs, and adverse effects make the general application of ChEIs for all patients with early AD unavailable. Several studies have tried to identify clinical and neuroimaging characteristics that might predict the cognitive response to ChEI therapy [4–8]. However, these studies were often limited by their small sample size and short period of follow up.
The medial temporal lobe is known to be the initial site of pathological changes of AD . Previous studies have shown that the degree of medial temporal atrophy (MTA) was associated with the risk of progression from mild cognitive impairment (MCI) to AD [10–12], the disease stage , and the rate of cognitive decline . Meanwhile, the association between MTA and the long-term therapeutic response to ChEI is not well established. Another neuroimaging characteristic is the white matter hyperintensity (WMH), which is viewed by some researchers as an indicator of the underlying vascular burden that contributes to cognitive dysfunction [15, 16]. In Taiwan, most of our AD patients who receive ChEI are reimbursed by the National Health Insurance System. A more extensive WMH was one of the exclusion criteria that precluded patients from ChEI paid for by the national insurance; there was a concern that this might indicate an underlying vascular pathology, in addition to Alzheimer’s pathology . Recent studies have shown an increased burden of WMH with an increasing severity of AD [18, 19]. However, whether or not the presence of WMH would influence the cognitive response to ChEI therapy remains undetermined.
We aimed to identify common neuroimaging indicators for the cognitive outcome predictors in AD patients who received ChEI therapy.
We recruited patients with very mild to moderate AD, Clinical Dementia Rating (CDR) scored 0.5 ~ 2, who received both cholinesterase inhibitor therapy and regular follow-up at the memory clinic of National Taiwan University Hospital, from August 1999 to June 2012. The diagnosis of AD was made after a comprehensive history review, neurological examination, laboratory survey, and neuroimaging study. All of the patients met the diagnostic criteria for probable AD dementia proposed by the National Institute of Neurological and Communicative Disorders and Stroke and the Alzheimer’s Disease and Related Disorders Association (NINCDS-NDRDA) work group in 1984 . Before starting the cholinesterase inhibitor, clinical data were collected prospectively, including basic demographic data, education level, baseline TMSE (Taiwanese Mini-Mental State Examination) score [21, 22], and CDR. A standardized regular follow up of TMSE and CDR was carried out before the trial, six months after, and annually after starting the cholinesterase inhibitor. Patients who were lost to follow-up within six months of cholinesterase use (seven patients, 2 % of patients initially recruited) were excluded, given that there were no clinical data available for evaluation of their response to ChEI. The ChEIs used in this cohort included donepezil (n = 240, 68 %), rivastigmine (n = 59, 17 %), and galantamine (n = 54, 15 %). The dosages of ChEIs were titrated up to the standard daily dose of 5 to 10 mg for donepezil, 6–9 mg for rivastigmine, and 16 mg for galantamine (if tolerable); changing from one ChEI to another was allowed if intolerable side effects were encountered.
Brain computed tomography was performed using one of our multi-detector CT scanners, including GE LightSpeed 16, VCT (GE Healthcare, Milwaukee, WI, USA), SOMATOM Sensation 64, and Emotion 16 (Siemens Medical Solutions, Erlangen, Germany). Axial cuts were taken at the top of the C1 lamina through the top of the calvarium. Axial images were reconstructed with 5-mm-thick sections at 5-mm intervals. In some of our subjects, coronal reconstructed images of 5 mm thickness were also available.
Magnetic resonance imaging (MRI) of the brain was performed on a 1.5TMR unit, either GE Excite (GE Healthcare) or MAGNETOM Sonata (Siemens Healthcare). The scanning protocol included axial FLAIR, fast spin-echo T2-weighted sequences, and a coronal T1WI or a 3D T1WI. The axial slices were positioned to run parallel to a line that joins the most inferoanterior and inferoposterior parts of the corpus callosum and had a thickness of 5 mm with a gap of 1.5 mm.
Visual scoring for medial temporal atrophy and white matter hyperintensity
MTA was rated on a coronal view of brain CT or T1-weighted MRI, using the scoring system proposed by Scheltens et al. . Each side of the medial temporal lobe and hippocampus was scored from 0 to 4. A higher MTA score indicated a higher degree of medial temporal lobe atrophy.
As the correlation of aging and MTA has been well established, we defined prominent MTA according to the patient’s age upon recruitment. A prominent MTA was defined as a MTA score more than 1 on either side for patients 75-years-old and under. For patients older than 75 years, a MTA score more than 2 was required to define a prominent MTA.
To determine the extent of WMH, a visual scoring system modified from that suggested by Fazekas et al.  was used. Each brain CT or MRI scan of the FLAIR series was rated from 0 to 3 on a coronal view, across two brain areas: frontal and parietal lobes of either side. The total WMH was scored 0 ~ 12, with the higher score indicating more extensive white matter hyperintensity. For WMH scoring, there is generally no accepted cut-off-point for different age groups. We defined a significant WMH if a brain area had a WMH score of 2 or above. The participants were stratified according to the severity of WMH, which included: (1) the presence of a significant WMH in any of the four brain areas; (2) the number of brain areas with significant WMH; and (3) the summation of the WMH scores in all four brain areas.
To determine the inter-rater reliability of visual scoring, 20 MRI or CT scans were rated for MTA and WMH scoring by two independent raters (YFC and YWC) who were blinded to the clinical data. The inter-rater reliability study showed good agreement between raters for both visual scoring for MTA (intra-class correlation coefficient = 0.954) and WMH (intra-class correlation coefficient = 0.950).
The study was approved by the National Taiwan University Hospital’s Institutional Review Board. All investigations were conducted according to the principles expressed in the Declaration of Helsinki. We obtained written informed consent from the participants or their proxies.
We used the Pearson chi-square test to compare the between-group differences of categorical variables and the Mann Whitney U test for numerical variables. The Log rank test was used for survival data. Stepwise linear regression analysis was performed separately to evaluate factors associated with a significant MTA and WMH. Inter-rater reliability for the visual ratings of WMH and MTA were measured by intra-class correlation coefficients. To access the cognitive response to cholinesterase inhibitors, we performed a survival analysis; we plotted the Kaplan-Meier survival curve by setting the endpoint as a significant TMSE decline from the baseline of more than 2 points. Patients who passed away or were lost to follow-up before a clinical evaluation at six months were excluded. A Cox proportional hazard model was applied to analyze factors affecting the time until a significant TMSE decline. Data were analyzed using the statistical software PASW for windows, version 18.0.
Demographic data and neuroimaging characteristics of the subjects
Mean ± SD, or number (%)
Age of starting ChEI (year)
74.1 ± 10.3
Gender, female/male, No. (%)
8.9 ± 5.1
19.7 ± 4.1
Baseline CDR, No. (%)
2 ~ 3
Total MTA score
3.4 ± 1.7
Maximum MTA score, No. (%)
Prominent MTA adjusted by age, No. (%)
Total WMH score
3.6 ± 3.1
Total WMH score, No. (%)
0 ~ 3
4 ~ 7
8 ~ 12
Number of areas with WMH score > =2
1 ~ 2
3 ~ 4
Patients were followed until the study end-point, death, or loss to follow-up. In summary, 162 (45.8 %) patients reached an end point (a more than two-point TMSE decline), 10 (2.8 %) died, and 65 (8.4 %) were lost to follow-up before a significant TMSE decline.
The mean survival time from a significant TMSE decline of all patients was 56.0 ± 5.2 months. The Kaplan-Meier survival curve for the TMSE decline did not differ significantly between patients with or without a significant WMH (a dichotomy), defined as a WMH score of two or more points at any brain area (log rank test p-value = 0.540). There were no significant differences in the survival curves between patients stratified by a total WMH dichotomy of 0–3 versus 4–12 (log rank test p-value = 0.431); there was no significant difference among the three groups, comprising a score of 0 to 3, 4 to 7, and 8 to 12 (log rank test p-value = 0.514); in addition, there was no significant difference among patient groups stratified by number of areas (a trichotomy) with significant WMH of 0, 1 ~ 2, or 3 ~ 4 areas (log rank test p-value = 0.142).
Regression coefficients in Cox proportional hazard models of factors associated with TMSE decline-free survival
Exp(B) (95 % CI)
Age of starting ChEI
0.971 (0.955 ~ 0.986)
Age of starting ChEI
0.965 (0.949 ~ 0.981)
Total MTA score
1.158 (1.056 ~ 1.271)
Regression coefficients in linear regression models of factors associated with total MTA score
B (95 % CI)
Total WMH score
0.202 (0.147 ~ 0.258)
Total WMH score
0.181 (0.124 ~ 0.237)
0.728 (0.275 ~ 1.182)
Total WMH score
0.186 (0.130 ~ 0.242)
0.822 (0.371 ~ 1.273)
0.053 (0.020 ~ 0.086)
Total WMH score
0.187 (0.133 ~ 0.242)
0.406 (−0.028 ~ 0.894)
0.086 (0.051 ~ 0.122)
−0.099 (−0.149 ~ −0.050)
Total WMH score
0.197 (0.143 ~ 0.250)
0.089 (0.053 ~ 0.125)
−0.117 (−0.162 ~ −0.072)
In this study, we founded that: (1) for patients with mild to moderate AD, a lower total MTA score and an older age predicted a better long term cognitive response to ChEI therapy, defined by a longer TMSE decline-free survival; (2) the severity of WMH does not significantly affect the TMSE decline-free survival; (3) a higher total MTA score was associated with a higher WMH score, higher educational level, and a lower baseline TMSE; and (4) a higher total WMH score was associated with older age, higher total MTA score, and higher baseline CDR.
There are two unique features of this study: first, simple visual scoring for MTA and WMH were used as neuroimaging markers, which are easily applicable in daily clinical practice; second, we used long term TMSE decline-free survival as the endpoint for response to ChEI treatment, rather than short term cognitive improvement, which has been used in most of the previous studies. We set our outcome measurement as the time until a TMSE decline of three or more points and our median follow up time was 46.6 months. Compared with the short -term cognitive response within months, the long-term outcome may be of higher clinical importance for both the patients and the insurance carriers.
In previous studies, volumetric measurements for medial temporal lobe atrophy, hippocampal atrophy, and entorhinal cortex thinning were associated with a poorer cognitive response after ChEI therapy for four or six months [5, 6]. Findings of our study imply that this effect may last for several years (median observation period of approximately four years). Although the volumetric measurement is quantitative and draws less concern regarding inter-rater reliability, the technique is technically demanding and time consuming. This makes this technique not conveniently applicable in routine clinical practice. It was shown by Duara et al. that a higher cut-point for MTA score is required for older subjects in order to separate AD patients from age-matched controls . In the original study of Scheltens et al. , a visual scoring of two or more successfully separated AD patients from age-matched controls; the median age of the study participants was 72.8 years. In another study by Duara et al. , the authors reported a mean MTA score of 2.45 on the left side and 2.43 on the right side in a group of 53 AD patients who had a mean age of 79.9 years. In this study, we define a “prominent MTA” as a MTA score of three or more for patients older than 75 years and a MTA score of two or more for patients 75 years old or younger. This age-adjusted cut-off-score for defining “prominent MTA” subsequently performed better in separating the TMSE decline-free survival curve under ChEI treatment. This finding is concordant with previous studies using volumetric measurements; this validates the visual scoring for MTA measurement as a marker for the rate of TMSE decline.
Unlike MTA, the role of white matter change in disease progression and response to ChEI therapy for AD patients remains controversial . In a study by Connelly et al., the presence of both hypertension and white matter lesions was associated with a less favorable functional outcome after ChEI therapy for six months . Other studies failed to show a significant correlation between the severity of WMH and cognitive or functional outcome after ChEI therapy for three months , one year , or nine months or more . On the other hand, when considering the subcortical hyperintensities in the cholinergic pathways using the Cholinergic Pathways Hyperintensities Scale (CHIPS), Behl et al. showed that patients in the high CHIPS group had improvement in executive functioning and working memory tasks after receiving ChEI therapy for one year . Our study enrolled a large sample size and had a relatively long follow-up period; we observed no significant correlation between the severity of WMH and ChEI therapeutic responses, in terms of the TMSE decline-free survival. Regarding the global white matter lesion burden, the WMH scoring cannot differentiate an underlying pathological change or anatomical involvement. For patients with AD, the white matter changes may be part of the subcortical changes secondary to the underlying neurodegenerative process ; alternatively, it may be related to concurrent vascular disease or vascular risk factors [30–32]. In order to exclude the possible confounding effect of vascular risk factors on the total WMH and MTA scores, we used hypertension, hyperlipidemia, diabetes mellitus , and obstructive sleep apnea  as independent variables in multiple stepwise linear regression analyses and found that in addition to old age, diabetes mellitus is the only risk factor that was related to total WMH scores. The heterogeneous pathophysiology underlying global white matter change may be an important reason why the WMH rating was less effective in predicting outcomes. Rating the subcortical involvement of the cholinergic pathway may have more of a clinical implication, although it may be less applicable in daily clinical practice [8, 28].
Linear regressions showed that the severity of MTA was positively associated with the severity of WMH and educational level; it was negatively associated with baseline TMSE. The association of WMH with MTA was independent of age, TMSE, or CDR. This supports the possible common neurodegenerative process that underlies both MTA and WMH. Another interesting finding was the association between the severity of MTA and educational level. Education has been shown to be a protective factor against the development of MCI and AD in several epidemiological and longitudinal observational studies [33, 34]. The cognitive reserve theory suggests that cognitive activities associated with education, occupational attainment, or leisure may delay the clinical expression of AD pathology by increasing the neuronal reserve or neuronal compensation . In our study, a higher education level was associated with higher MTA scores. This finding is consistent with the cognitive reserve theory that more advanced neurodegenerative pathology may be present in patients with higher educational levels than those with lower educational level with the same clinical severity. A negative association between education and regional cerebral blood flow in the parietotemporal area  or gray matter densities in the hippocampal area  were also shown in previous studies.
There are some limitations to this study. First, we used the survival time to a significant TMSE decline, instead of the rate of TMSE decline as the outcome measurement. Because the study subjects are from a cohort that received ChEI therapy reimbursed by the National Health Insurance of Taiwan, most of the patients discontinued ChEI therapy once a significant TMSE decline was observed as there was a discontinuation of support from the insurance system. Nevertheless, the duration before a significant cognitive decline may be more clinically valuable, as this would be more beneficial to prolonging the early stages of AD, considering quality-adjusted life years. Second, we did not control for the type of ChEI used; this allowed for changing from one ChEI to another when intolerable side effects were encountered. A previous meta-analysis showed no evidence of any differences in efficacy between different ChEIs . Clinically, we choose from different ChEIs mainly based on the side effect profile. Thus, the type of ChEI was not controlled when evaluating the cognitive response. Finally, visual scoring for measurement of the severity of MTA and WMH was not qualitative and was associated with a ceiling effect . In addition, there was no generally accepted age-specific cut-off for WMH scoring. The high intra-class correlation coefficient supported good inter-rater agreement in the visual scoring of either WHM or MTA. We also found a consistent association between higher MTA scores and poorer cognitive responses; this was found to be independent of age, TMSE, CDR, or education, using the Cox proportional model for survival analysis. On the other hand, the severity of WMH did not significantly affect cognitive responses; this was true regardless of the fact that we tried variable stratification strategies, including using the maximal score of the areas, the summation of the total scores from all four areas, or the number of areas with WMH. These findings suggest that the global assessment of WMH is of little, if any, value in predicting cognitive outcomes while on ChEI therapy.
Our results support the application of visual scoring of MTA as an indicator in predicting long term cognitive responses to cholinesterase therapy for patients with mild to moderate Alzheimer’s dementia. On the other hand, the global assessment of the white matter disease burden may not contribute significantly to cognitive outcomes. Furthermore, studies including location or pathway specific neuroimaging characteristics are required to identify possible predictive values of different patterns of WMH in the therapeutic response. At the current stage, we suggest against the application of the global assessment of the white matter disease burden to exclude patients from clinically efficacious therapy under the diagnosis of Alzheimer’s dementia.
Clinical Dementia Rating
medial temporal atrophy
Taiwanese Mini-Mental State Examination
white matter hyperintensity
We thank the participants in the study. This study was supported by a grant from the Ministry of Science and Technology, Taiwan (TW) (103-2314-B002-175).
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