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Cognitive performance in patients with chronic tension-type headache and its relation to neuroendocrine hormones
The Egyptian Journal of Neurology, Psychiatry and Neurosurgery volume 56, Article number: 16 (2020)
Tension-type headache is the most common headache to be seen in clinical practice. Depression is highly prevalent in chronic tension-type headache (CTTH) patients attending the clinical settings. Cognitive impairment and neuroendocrine dysregulation had been reported in patients with depression and patients with CTTH.
To assess the cognitive performance and investigate its possible relations to neuroendocrine levels in patients with CTTH.
Subjects and methods
Patients with CTTH, depression, and control subjects were recruited. CTTH was diagnosed according to the International Classification of Headache Disorders. Cognitive performance, depression severity, and pain intensity were assessed by the Montreal Cognitive Assessment Arabic version, Beck’s Depression Inventory, and McGill Pain Questionnaire respectively. Blood samples were collected in the morning within 60 min after waking up from 8:00 to 9:00 a.m. to measure serum levels of basal plasma CRH, ACTH, Cortisol, TSH, FT3, and FT4.
Both patients with CTTH and depression had impaired cognitive performance. Patients with CTTH and patients with depression had altered the hypothalamus-pituitary-adrenal axis, and pituitary-thyroid axis. The hormonal levels significantly correlated with cognitive function in patient groups, especially patients with CTTH.
Patients with CTTH had cognitive dysfunction which could be related to neuroendocrine hormonal dysregulation.
Tension-type headache (TTH) is the most common head pain seen in clinical practice. Headache is the third most prevalent pain worldwide . TTH is defined as a mild to moderate band-like pressure headache associated with some somatic and emotional symptoms. The frequency and duration of TTH varied from infrequent episodes of a headache to frequent, long-lasting, or even chronic. Chronic tension-type headache (CTTH) occurs over 15 days per month at least for 3 months per year, and lasts hours to days, or unremitting . In a population-based study in Denmark, the authors reported that about a third of the studied population had episodic TTH, and 2 to 3% of the studied population had CTTH . The lifetime prevalence was 79% and 3% for TTH and CTTH respectively in another study . In the Kingdom of Saudi Arabia, 8 to 12% of the Saudi population suffers from TTH [5, 6]. Patients with CTTH often suffer from memory impairment, sleep disturbance, and other psychiatric disorders especially anxiety and depression . Although it is common, TTH has low healthcare and public profile than migraine. Several studies reported impaired cognitive performance in patients with migraine [8, 9]. However, studies that evaluate the cognitive function of patients with CTTH are rare, the previous study reported cognitive impairment and neuroendocrine dysregulation in those patients . Moreover, epidemiological studies revealed that depression is highly prevalent in CTTH patients [11,12,13,14]. Patients with depression tend to have neuroendocrine dysregulation, which includes a hyperactive hypothalamic-pituitary-adrenal axis (HPA) and non-suppression of cortisol by dexamethasone . Furthermore, many neuroendocrine hormones dysregulation, including hormones of the hypothalamus-pituitary-adrenal (HPA) axis, hypothalamus-pituitary-thyroid (HPT) axis, and hypothalamus-pituitary-gonadal (HPG) axis were associated and correlated with impaired cognitive performance in different medical disorders [16,17,18,19,20,21,22,23,24,25,26]. In addition, growing evidence indicated that corticotropin releasing hormone (CRH) involved in learning and memory. Emerging evidence suggested that thyroid hormones involved in cognitive performance [17, 23, 27].
The cognitive impairment reported in CTTH could be the result of neuroendocrine hormones alteration or the effect of associated depression.
In this study, we aimed to (1) assess the cognitive performance and measure the serum concentration of neuroendocrine hormones [corticotropin-releasing hormone (CRH), adrenocorticotropic hormone (ACTH), cortisol, thyroid-stimulating hormone (TSH), free triiodothyronine (FT3), and free thyroxine (FT4)] in patients with CTTH. (2) Investigate the possible relations between cognitive performance and neuroendocrine hormones.
Subjects and methods
In a cross-sectional case-control study, we investigated 100 patients with CTTH, 97 patients with depression, and 105 control subjects without headache or depression for cognitive performance and serum levels of neuroendocrine hormones. Patients were recruited from neurology and psychiatry outpatient clinics of Prince Sattam bin Abdulaziz University Hospital in Alkharj City, Kingdom of Saudi Arabia, from February 2017 to January 2019. Control subjects were selected from the physiotherapy unit of the same hospital. Subjects with infectious diseases, disease of the endocrine system, disease of the immune system, or psychiatric disorder other than mild or moderate depression were excluded. CTTH was diagnosed according to the International Classification of Headache Disorders (ICHD)-III beta criteria , but a strict version was used instead—all patients must have all of the following four headache characteristics: bilateral, mild-to-moderate intensity, non-pulsating headache not aggravated by routine physical activity, and their headaches must not be associated with any of nausea, vomiting, photophobia, or phonophobia .
Depression was diagnosed in accordance with the Diagnostic and Statistical Manual of Mental Disorders fifth edition . Cognitive performance, depression severity, and pain intensity were assessed by the Montreal Cognitive Assessment Arabic version (MoCA) , Beck’s Depression Inventory-II (BDI) , and McGill Pain Questionnaire (MPQ) short form , respectively.
Blood samples were collected under aseptic precaution using sterile disposable syringes in the morning within 60 min after waking up from 8:00 to 9:00 am. Patients with CTTH were in active episodes of headache when the blood samples were obtained. Blood samples were immediately centrifuged at 3000 rpm for 5 min and sera were separated and kept in labeled sterile microtubes at − 80 °C until the hormones were assayed. An enzyme-linked immunosorbent assay was performed to detect the basal serum concentrations of neuroendocrine hormones including CRH, ACTH, CORTISOL, TSH, FT3, and FT4. This assay was processed according to the instructions and regulations of the used kits.
For all the participants, written informed consent was obtained after the study procedures had been explained. The study protocol and the consent form were reviewed and accepted by the Institutional Review Board of College of Medicine, Prince Sattam bin Abdul-Aziz University.
The data were analyzed using the Statistical Package for the Social Sciences (SPSS) 13.0. Descriptive statistics were calculated. The statistical analysis was performed with non-parametric chi-square between gender, and pain severity in the studied groups. Analysis of variance (ANOVA) was used to test the differences in demographic, clinical, and hormonal levels among subgroups. Pearson’s correlation coefficient (r) was used to analyze the association between the different variables. Regression analysis was performed to identify the effect of different hormones on cognitive function. Values of p < 0.05 were considered to be statistically significant.
One hundred (40 male and 60 female) patients with CTTH, 97 (34 male and 63 female) patients with depression, and 105 (42 male and 63 female) age, sex, and years of education matched control volunteers were enrolled in this study. Patients with depression had significantly higher BDI scores compared to patients with CTTH and control (p < 0.01). Control volunteers had significantly higher scores of cognitive performances (p < 0.001) while no significant difference between patients with CTTH and patients with depression (Table 1). Seventeen (17%) patients with CTTH and 3 (3.10%) patients with depression experienced excruciating pain. The difference in pain severity between them was significant (p < 0.01) (Table 2). The measured hormonal levels in the studied population fall within the normal reference range. For the HPA axis, the serum levels of CRH, ACTH, and cortisol were significantly higher in patients with CTTH and patients with depression than control (p < 0.001), patients with depression had significantly higher CRH and ACTH than patients with CTTH (p < 01001). For pituitary-thyroid (PT) axis, patients with CTTH and patients with depression had significantly higher serum levels of TSH (p < 0.01) but significantly lower FT3 and FT4 levels compared to control group, while, FT3 and FT4 were significantly lower (p < 0.01) in patients with depression than patients with CTTH (Table 3).
Correlations between serum hormonal levels and cognitive performance and depression severity in patients with CTTH and patients with depression were presented in Tables 4 and 5. In patients with CTTH, the serum levels of CRH, ACTH, cortisol, and TSH had significant negative effects on MoCA scores (r − .314, p = .001; r − .378, p = .000; r− .222, p .027; r − .388, p = .000, respectively) while the serum level of FT4 had positive effect on the MoCA score (r .372, p = .000). The linear regression analysis revealed that ACTH and TSH were the independent hormones that were related to cognitive function (Tables 6 and 7). TSH was negatively correlated significantly with MoCA in patients with depression (r − .221, p = .029).
The serum levels of CRH, ACTH, TSH were positively (r .202, p = .044; r .285, p = .004; r .416, p = .000, respectively) and serum level of FT4 was negatively (r − .388, p = .000) correlated with BDI score among patients with CTTH. In patients with depression, the serum levels of CRH, ACTH, cortisol, and TSH were positive (r .403, p = .000; r .288, p = .004; r 0427, p = .000; r .834, p = .000, respectively) and serum levels of FT3 and FT4 were negative (r − .357, p = .000 and r − .523, p = .000) correlated with BDI score.
Patients with chronic daily headache showed reduced quality of life [33, 34], the chronic headache reduces the workdays times, lost days with household activities, affects family, and social relationships [35, 36]. Patients with CTTH usually suffering from poor cognitive performance. In this study, both patients with CTTH and patients with depression had cognitive impairment without significant differences between them. A study done by Moore et al.  suggested that patients who experiencing TTH had impaired attention. Another study  revealed that children with CTTH were more likely to have weaker verbal skills. Similarly, adult patients with CTTH with a history of childhood TTH had poor verbal and performance intelligence quotient (IQ) scores and reading difficulties . Most recently, Ping et al.  reported an impairment in cognitive function, especially memory, in patients with CTTH. Hammar et al.  found that depressed patients showed impaired cognitive performance on cognitively demanding tasks when symptomatic and that the impairment prevails after 6 months, despite significant improvement in the depression symptoms.
In this study, most patients (63%) with CTTH had depression. This finding is supported by the study of Lampl et al.  who suggested that subjects with TTH exhibit comorbid depression, and almost half of the patients with CTTH were diagnosed as having mild or moderate depression [11,12,13].
In the present study, the hypothalamus-pituitary-adrenal (HPA) axis was altered (higher CRH, ACTH, and cortisol) in patient groups compared to control volunteers. At the same time, the patient groups had dysregulated pituitary-thyroid (PT) axis (higher TSH, and lower FT3, and FT4) than control volunteers. Patients with depression had more prominent HPA and PT dysfunction than patients with CTTH. The exact mechanism of altered pituitary-thyroid function in non-thyroidal illness associated with neuropsychiatric illness remains unclear , it might be due to neurotransmitters alteration  or change in TSH secretion with centrally mediated TSH dysregulation . A recent study reported similar findings in patients with CTTH with hyperactive HPA axis and hypoactive HPT axis . Alteration in HPA axis activity was reported to be common in dementia and progressive cognitive impairment [45,46,47,48]. Some previous studies reported similar HPA and HPT dysfunction in patients with depression [49,50,51,52], and the dysregulation of HPA axis activity was considered to be the hallmarks of major depression [53, 54]. The correlation between serum levels of neuroendocrine hormones and cognitive functions showed significant negative effects of CRH, ACTH, cortisol, and TSH and positive effects of FT4 on cognitive function in patients with CTTH, and ACTH, and TSH appeared to be the independent hormones related to cognitive function. However, in patients with depression, the only significant negative correlation was reported with TSH which might suggest that the cognitive impairment in patients with CTTH may be related to alterations in functions of HPA and PT axes and not due to the presence of comorbid depression, specially, patients with depression had more prominent hormonal dysregulation than patients with CTTH.
Endocrine hormones play an essential role in maintaining brain function, including cognitive performance . A temporary increase in CRH facilitates learning and memory that are hippocampal-dependent ; however, prolonged elevation could impair spatial memory performance . Decreased response of ACTH to CRH had also been related to cognitive dysfunction . Previous study had proposed that cortisol can affect the prefrontal cortex and altered higher cognitive functions . A negative association was reported in previous studies between endogenous cortisol levels and cognitive measures of processing speed, and executive function [57, 58]. The relation between HPA function and memory is mixed, while cortisol appears to enhance memory consolidation, it more often impairs memory retrieval [59, 60].
HPT hormones are associated with cognitive function. The thyrotropin-releasing hormone has direct or indirect effects on cognitive abilities and mood . Thyroid dysfunction are associated with decreased executive abilities . Adults with lower levels of thyroid hormones had poor cognitive and psychomotor function than those with a higher level of thyroid hormones . Furthermore, low FT3 and high TSH had been related to cognitive deterioration . In addition, subjects with high TSH levels might be more exposed to working memory and visuospatial and/or visuo-constructional deterioration [63, 64].
Many studies have shown that hormones in HPA and HPT axes can directly or indirectly affect the prefrontal cortex and hippocampus, thereby affecting cognitive performance [23,24,25,26,27, 52, 56, 65]. In the hippocampus, CRH is expressed in inhibitory interneurons and primarily interacts with CRH receptor 1 . At the same time, thyroid hormone and adrenal steroids have a major biological role in the differentiation and survival of neurons . Cortisol passes across the blood-brain barrier probably through binding to thyroid hormones . Cortisol receptors are well-represented in many important cognitive related areas of the brain including the limbic structures, prefrontal cortex, and anterior cingulate cortex [16, 67]. As a result, the HPA and HPT dysfunction can affect cognitive function probably as a result of disturbances of those brain structures [68,69,70,71,72].
The present study had some limitations including the lack of measurement of Thyrotropin-releasing hormone (TRH) that evaluates the hypothalamus-pituitary-thyroid axis accurately; however, it was not available in our center. Also, we did not analyze the different domains of cognitive function as we thought it is beyond the scope of our aim.
Based on our results, we recommend periodic neuroendocrine hormones assessment for early prediction of changes that may emerge from hormonal dysregulation in patients with CTTH.
Patients with CTTH had cognitive dysfunction and prominent hormonal changes. The hormonal changes may be the cause of the cognitive decline in patients with CTTH.
Availability of data and materials
All datasets generated and analyzed during the current study are not publicly available but are available by reasonable request from the corresponding author.
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Kotb, M.A., Kamal, A.M., Al-Malki, D. et al. Cognitive performance in patients with chronic tension-type headache and its relation to neuroendocrine hormones. Egypt J Neurol Psychiatry Neurosurg 56, 16 (2020). https://doi.org/10.1186/s41983-020-0150-3
- Chronic tension-type headache
- Cognitive impairment
- Neuroendocrine hormones