Exploring the co-occurrence of depression, anxiety and insomnia symptoms, diagnoses and treatments in primary care: observational study using UK primary care data

BACKGROUND

Depression, anxiety and insomnia often co-occur. However, there is a lack of research regarding how they cluster and how this is related to medication used to treat them.

AIMS

To describe the frequencies and associations between depression, anxiety and insomnia, and treatment for these conditions in primary care.

METHOD

A retrospective cohort study using UK electronic primary care records. We included individuals aged between 18 and 99 years old with one or more records suggesting they had a diagnosis, symptom or drug treatment for anxiety, depression or insomnia between 2015 and 2017. We report the conditional probabilities of having different combinations of diagnoses, symptoms and treatments recorded.

RESULTS

There were 1 325 960 records indicative of depression, anxiety or insomnia, for 739 834 individuals. Depression was the most common condition (n = 106 117 records), and SSRIs were the most commonly prescribed medication (n = 347 751 records). Overall, individuals with a record of anxiety were most likely to have co-occurring symptoms and diagnoses of other mental health conditions. For example, of the individuals with a record of generalised anxiety disorder (GAD), 24% also had a diagnosis of depression. In contrast, only 0.6% of those who had a diagnosis of depression had a diagnosis or symptom of GAD. Prescribing of more than one psychotropic medication within the same year was common. For example, of those who were prescribed an SNRI (serotonin-norepinephrine reuptake inhibitor), 40% were also prescribed an SSRI (selective serotonin reuptake inhibitor).

CONCLUSIONS

The conditional probabilities of co-occurring anxiety, depression and insomnia symptoms, diagnoses and treatments are high.

A qualitative exploration of the barriers and facilitators to self-managing multiple long-term conditions amongst people experiencing socioeconomic deprivation

BACKGROUND

Globally, it is estimated that one in three adults live with two or more long-term conditions (multiple long-term conditions, MLTCs), that require self-management. People who experience socioeconomic deprivation face significant health inequalities due to a range of interrelated characteristics that lead to a lack of resources and opportunities. Previous research with underserved populations indicate low levels of trust towards primary care providers and potential barriers for developing patient-healthcare professional relationships. The purpose of this paper is to explore the barriers and facilitators to self-managing MLTCs, amongst people who experience socioeconomic deprivation.

METHODS

Semistructured one-to-one interviews with adults (n = 28) living in London and Sheffield, United Kingdom with MLTCs who are experiencing socioeconomic deprivation. Participants were recruited through general practices, community channels and social media. Data were analysed in NVivo using reflexive thematic analysis methods.

FINDINGS

Four analytical themes were developed: (1) challenges in accessing healthcare services, financial assistance, and cultural awareness; (2) empowerment and disempowerment through technology, including digital exclusion, and use of technology; (3) impact and causes of exclusion on self-management, including social isolation, area-based and economic exclusion, and health-related stigma and (4) adapting self-management strategies, including cost-effective, and culturally/lifestyle appropriate strategies.

CONCLUSIONS

Future health interventions and services need to be developed with consideration of the combined complexities of managing MLTCs while experiencing socioeconomic deprivation. Increased awareness in practitioners and commissioners of the complexities surrounding the lives of people experiencing socioeconomic deprivation, and the need for targeted strategies to promote self-management of MLTCs are of great importa.

PATIENT OR PUBLIC CONTRIBUTION

A patient advisory group contributed to all stages of the study, including providing important feedback on study documents (topic guides and recruitment materials), as well as providing critical insights surrounding the interpretation of interview data.

Risk of Parkinson's disease in people with New Onset Anxiety over 50 years - Incidence and Associated Features

BACKGROUND

Anxiety has been identified as a prodromal feature of Parkinson's disease (PD). The prospective risk of PD in those newly presenting with anxiety and factors that increase the risk of PD in patients with anxiety have not been investigated.

AIM

To investigate the incidence of PD in people with anxiety above the age 50 years and clinical features associated with later diagnosis of PD in people with anxiety.

DESIGN AND SETTING

Retrospective cohort study using UK primary care data of people between 2008 and 2018 who had new onset anxiety over the age of 50 years.

METHOD

We fitted Weibull survival regression models and estimated hazard ratios (HR) for modelling time-to-PD in those with and without anxiety and when determining the risk of developing PD in those with anxiety. Results were adjusted for sociodemographic and lifestyle factors and relevant physical and mental health conditions.

RESULTS

The risk of PD was increased 2-fold compared to the non-anxiety group after adjustment for age, sex, social deprivation, lifestyle factors, severe mental illness, head trauma and dementia HR 2.1 (CI: 1.9-2.4). In those with anxiety, the presence of depression, hypotension, tremor, rigidity, balance impairment, constipation, sleep disturbance, fatigue, and cognitive impairment were associated with an increased risk of developing PD.

CONCLUSION

The risk of developing PD was at least doubled in people with anxiety compared to those without. The clinical features of those who developed PD can help identify patients presenting with anxiety who are in the prodromal phase of PD.

Clinical effectiveness of pharmacological and non-pharmacological treatments for the management of anxiety in community dwelling people living with dementia: A systematic review and meta-analysis

People living with dementia commonly experience anxiety, which is often challenging to manage. We investigated the effectiveness of treatments for the management of anxiety in this population. We conducted a systematic review and meta-analysis of randomised controlled trials, and searched EMBASE, CINAHL, MEDLINE and PsycInfo. We estimated standardised mean differences at follow-up between treatments relative to control groups and pooled these across studies using random-effects models where feasible. Thirty-one studies were identified. Meta-analysis demonstrated non-pharmacological interventions were effective in reducing anxiety in people living with dementia, compared to care as usual or active controls. Specifically, music therapy (SMD-1.92(CI:-2.58,-1.25)), muscular approaches (SMD-0.65(CI:-1.02,-0.28)) and stimulating cognitive and physical activities (SMD-0.31(CI:-0.53,-0.09)). Pharmacological interventions with evidence of potential effectiveness included Ginkgo biloba, probiotics, olanzapine, loxapine and citalopram compared to placebo, olanzapine compared to bromazepam and buspirone and risperidone compared to haloperidol. Meta-analyses were not performed for pharmacological interventions due to studies' heterogeneity. This has practice implications when promoting the use of more non-pharmacological interventions to help reduce anxiety among people living with dementia.

Intervention components in the self-management of Parkinson's: a mixed-methods synthesis of qualitative and quantitative evidence

INTRODUCTION

Self-management interventions consist of multiple components to support people in the management of medical, emotional, and behavioural aspects of their condition, and aim to improve quality of life, function, and other outcomes. A systematic review of self-management interventions in Parkinson's showed no conclusive evidence for effectiveness of specific self-management approaches in Parkinson's to date but identified several potentially useful components.

AIM

To identify the key required components for self-management in people with Parkinson's by synthesising evidence from a body of primary qualitative evidence and systematic reviews, and to explore which of these key components should be incorporated into trials of self-management in Parkinson's.

METHOD

A mixed-methods synthesis was conducted. We combined data from two primary qualitative studies and a systematic review of qualitative studies that focused on self-management in Parkinson's to identify key intervention components. These were then mapped onto the results of a systematic review of Randomised Controlled Trials (RCTs) using matrices. First, data were extracted from the qualitative studies with people with Parkinson's and healthcare professionals on the key self-management components in this population. Second, a matrix table was created to map the identified Parkinson's specific self-management components against potential effectiveness from published RCTs of self-management interventions.

RESULTS

Synthesis of qualitative data identified 15 potential self-management components. These 15 components included components needed to start self-managing (e.g., information, skill acquirement) and components needed to maintain self-managing (e.g., self-motoring, increasing motivation). From 18 RCTs, interventions varied in how many components were included (range 1-10). Trials reporting significant beneficial effects of their intervention included a higher number of components (4 or more self-management components) than trials without significant findings (1-3 self-management components).

CONCLUSION

Fifteen key self-management components were identified that should be incorporated into interventions or programs of self-management in Parkinson's. No current trial has incorporated all aspects, but a higher number of these key components appears to make trials of self-management interventions more likely to be successful.

Effectiveness of self-management interventions for long-term conditions in people experiencing socio-economic deprivation in high-income countries: a systematic review and meta-analysis

BACKGROUND

Long-term conditions (LTCs) are prevalent in socio-economically deprived populations. Self-management interventions can improve health outcomes, but socio-economically deprived groups have lower participation in them, with potentially lower effectiveness. This review explored whether self-management interventions delivered to people experiencing socio-economic deprivation improve outcomes.

METHODS

We searched databases up to November 2022 for randomized trials. We screened, extracted data and assessed the quality of these studies using Cochrane Risk of Bias 2 (RoB2). We narratively synthesized all studies and performed a meta-analysis on eligible articles. We assessed the certainty of evidence using GRADE for articles included in the meta-analysis.

RESULTS

The 51 studies included in this review had mixed findings. For the diabetes meta-analysis, there was a statistically significant pooled reduction in haemoglobin A1c (-0.29%). We had moderate certainty in the evidence. Thirty-eight of the study interventions had specific tailoring for socio-economically deprived populations, including adaptions for low literacy and financial incentives. Each intervention had an average of four self-management components.

CONCLUSIONS

Self-management interventions for socio-economically deprived populations show promise, though more evidence is needed. Our review suggests that the number of self-management components may not be important. With the increasing emphasis on self-management, to avoid exacerbating health inequalities, interventions should include tailoring for socio-economically deprived individuals.

Delivering Optimal Care to People with Cognitive Impairment in Parkinson's Disease: A Qualitative Study of Patient, Caregiver, and Professional Perspectives

Background

Cognitive impairment is common in Parkinson's disease (PD) and associated with lower quality of life. Cognitive impairment in PD manifests differently to other dementia pathologies. Provision of optimal care requires knowledge about the support needs of this population.

Methods

Eleven people with PD and cognitive impairment (PwP), 10 family caregivers, and 27 healthcare professionals were purposively sampled from across the United Kingdom. Semistructured interviews were conducted in 2019-2021, audio-recorded, transcribed, and analysed using reflexive thematic analysis.

Results

Cognitive impairment in PD conveyed increased complexity for clinical management and healthcare interactions, the latter driven by multifactorial communication difficulties. Techniques that helped included slow, simple, and single messages, avoiding topic switching. Information and emotional support needs were often unmet, particularly for caregivers. Diagnostic pathways were inconsistent and awareness of cognitive impairment in PD was poor, both contributing to underdiagnosis. Many felt that PwP and cognitive impairment fell through service gaps, resulting from disjointed, nonspecific, and underresourced services. Personalised care was advocated through tailoring to individual needs of PwP and caregivers facilitated by flexibility, time and continuity within services, and supporting self-management.

Conclusions

This study highlights unmet need for people with this complex condition. Clinicians should adapt their approach and communication techniques for this population and provide tailored information and support to both PwP and caregivers. Services need to be more streamlined and collaborative, providing more time and flexibility. There is a need for wider awareness and deeper understanding of this condition and its differences from other types of dementia.

Views of people living with dementia and their carers on their present and future: a qualitative study

BACKGROUND

Dementia leads to multiple issues including difficulty in communication and increased need for care and support. Discussions about the future often happen late or never, partly due to reluctance or fear. In a sample of people living with dementia and carers, we explored their views and perceptions of living with the condition and their future.

METHODS

Semi-structured interviews were conducted in 2018-19 with 11 people living with dementia and six family members in England. Interviews were audio-recorded, transcribed and analysed using reflexive thematic analysis.

RESULTS

Findings were explored critically within the theory of social death and three themes were developed: (1) loss of physical and cognitive functions, (2) loss of social identity, and (3) social connectedness. Most participants living with dementia and carers wanted to discuss the present, rather than the future, believing a healthy lifestyle would prevent the condition from worsening. Those with dementia wanted to maintain control of their lives and demonstrated this by illustrating their independence. Care homes were often associated with death and loss of social identity. Participants used a range of metaphors to describe their dementia and the impact on their relationships and social networks.

CONCLUSION

Focusing on maintaining social identity and connectedness as part of living well with dementia may assist professionals in undertaking advance care planning discussions.

Self-management of multiple long-term conditions: A systematic review of the barriers and facilitators amongst people experiencing socioeconomic deprivation

BACKGROUND

Multiple long-term conditions are rising across all groups but people experiencing socioeconomic deprivation are found to have a higher prevalence. Self-management strategies are a vital part of healthcare for people with long-term conditions and effective strategies are associated with improved health outcomes in a variety of health conditions. The management of multiple long-term conditions are, however, less effective in people experiencing socioeconomic deprivation, leaving them more at risk of health inequalities. The purpose of this review is to identify and synthesise qualitative evidence on the barriers and facilitators of self-management on long-term conditions in those experiencing socioeconomic deprivation.

METHODS

MEDLINE, EMBASE, AMED, PsycINFO and CINAHL Plus were searched for qualitative studies concerning self-management of multiple long-term conditions among socioeconomically disadvantaged populations. Data were coded and thematically synthesised using NVivo.

FINDINGS

From the search results, 79 relevant qualitative studies were identified after the full text screening and 11 studies were included in the final thematic synthesis. Three overarching analytical themes were identified alongside a set of sub-themes: (1) Challenges of having multiple long-term conditions; prioritisation of conditions, impact of multiple long-term conditions on mental health and wellbeing, polypharmacy, (2) Socioeconomic barriers to self-management; financial, health literacy, compounding impact of multiple long-term conditions and socioeconomic deprivation, (3) Facilitators of self-management in people experiencing socioeconomic deprivation; maintaining independence, 'meaningful' activities, support networks.

DISCUSSION

Self-management of multiple long-term conditions is challenging for people experiencing socioeconomic deprivation due to barriers around financial constraints and health literacy, which can lead to poor mental health and wellbeing. To support targeted interventions, greater awareness is needed among health professionals of the barriers/challenges of self-management among these populations.

People with Parkinson’s perspectives and experiences of self-management: Qualitative findings from a UK study

Introduction

Parkinson’s prevalence is growing, and more people are being impacted by the condition than ever before. Self-management has been proposed as one way to enable people living with the condition to improve or maintain their quality of life and wellbeing whilst living at home.

Aim

To explore the views and experiences of how people living with Parkinson’s self-manage their condition and identify areas needed to be incorporated into self-management resources or interventions.

Method

Twenty people with Parkinson’s from across London and Hertfordshire, UK took part in semi-structured interviews on self-management. Interviews were transcribed and analysed using thematic analysis to identify themes.

Results

Three main themes were identified: (1) Management of physical symptoms, which included engaging in physical activities, adapting their lifestyles, managing medication and using e-health resources; (2) Management of emotional impact, which involved using a range of cognitive and practical strategies, and seeking talking therapies and medication; and (3) barriers to self-management such as accessing accurate information, experiencing stigma towards their condition which impacted their self-esteem and identity, in turn impacting on their ability to self-manage.

Conclusion

Holistic and person-centred self-management programmes or interventions should be developed incorporating components such as medication and emotional support, individualised planning of exercise regimes, and accessible, timely and accurate information. Furthermore, more public health knowledge on Parkinson’s is needed to help reduce stigma.

Orthostatic Hypotension and Antiparkinsonian Drugs: A Systematic Review and Meta-analysis

BACKGROUND

Orthostatic hypotension (OH) is multifactorial in Parkinson's disease (PD). Antiparkinsonian medication can contribute to OH, leading to increased risk of falls, weakness and fatigue.

METHODS

We conducted a systematic review and meta-analysis of randomised controlled trials (RCTs) of antiparkinsonian drugs associated with OH as an adverse effect, compared to placebo. We searched EMBASE, MEDLINE and Web of Science databases until November 2020. Analysis used fixed-effects models and the GRADE tool to rate quality of evidence. Meta-analysis was performed if 3 or more studies of a drug group were available.

RESULTS

Twenty-one RCTs including 3783 patients were included comparing 6 PD drug groups to placebo (MAO-B inhibitors, dopamine agonists, levodopa, COMT inhibitors, levodopa and adenosine receptor antagonists). OH was recorded as an adverse event or measurement of vital signs, without further specification on how this was defined or operationalised. Meta-analysis was performed for MAO-B inhibitors and dopamine agonists, as there were 3 or more studies for these drug groups. In this analysis, compared with placebo, neither MAO-B inhibitors or dopamine agonists were associated with increased risk of OH, (OR 2.28 [95% CI:0.81-6.46]), (OR 1.39 [95% CI:0.97-1.98]).

CONCLUSIONS

Most studies did not specifically report OH, or reporting of OH was limited, including how and when it was measured. Furthermore, studies specifically reporting OH included participants that were younger than typical PD populations without multimorbidity. Future trials should address this, for example,, by including individuals over the age of 75, to improve estimations of how antiparkinsonian medications affect risk of OH.

Exploring the experiences of people and family carers from under-represented groups in self-managing Parkinson's disease and their use of digital health to do this

Introduction

Digital health is thought to enable people to better manage chronic conditions, such as Parkinson's. However, little is known about how people from under-represented groups with chronic conditions use digital health to self-manage.

Objective

The objective of our study was to explore the experiences of people and family carers from under-represented groups in self-managing Parkinson's, including their use of digital health to do this.

Methods

Semi-structured interviews (n = 18, including four dyadic) were conducted remotely, with 16 people with Parkinson's and six family carers in 2020–2021. Participants were purposively sampled from under-represented groups: belong to an ethnic minority, or having significant physical or sensory impairment. Interviews were audio-recorded, transcribed and analysed using thematic analysis.

Results

Three main themes of importance were developed: ‘self-management support’, ‘digital health use to support self-management’ and ‘identity, attitudes and characteristics’. Participants received medical, psychological, social and practical self-management support. Some participants used digital health resources, e.g., Parkinson's UK website. Digital literacy was the biggest barrier to using digital health, regardless of background, often dependant on previous occupation and confidence. Few ethnic minority participants thought race or culture alters self-management ability and most believed there was no need for digital health interventions to be tailored to an individual's race or culture. Some felt inclusivity was important in terms of diverse images of people. A range of considerations were identified to optimise digital health, such as assistive equipment for people with sensory impairment.

Conclusions

Barriers to using digital health for self-management were primarily dependent on personal factors including digital literacy and attitudes but rarely race or culture. We recommend the optimisation of digital health interventions by providing assistive technology at low cost, and visual inclusiveness should be promoted by including images of people from diverse backgrounds.

Drug-induced orthostatic hypotension: A systematic review and meta-analysis of randomised controlled trials

BACKGROUND

Drug-induced orthostatic hypotension (OH) is common, and its resulting cerebral hypoperfusion is linked to adverse outcomes including falls, strokes, cognitive impairment, and increased mortality. The extent to which specific medications are associated with OH remains unclear.

METHODS AND FINDINGS

We conducted a systematic review and meta-analysis to evaluate the extent to which specific drug groups are associated with OH. EMBASE, MEDLINE, and Web of Science databases were searched from inception through 23 November 2020. Placebo-controlled randomised controlled trials (RCTs) on any drug reporting on OH as an adverse effect in adults (≥18 years) were eligible. Three authors extracted data on the drug, OH, dose, participant characteristics, and study setting. The revised Cochrane risk-of-bias tool for randomised trials (RoB 2) was used to appraise evidence. Summary odds ratios (ORs) were estimated for OH using fixed effects Mantel-Haenszel statistics. We conducted subgroup analysis on validity of OH measurement, drug dose, risk of bias, age, and comorbidity. The Grading of Recommendations Assessment, Development, and Evaluation (GRADE) tool was used to summarise the certainty of evidence. Of 36,940 citations, 69 eligible RCTs were included in the meta-analysis comprising 27,079 participants. Compared with placebo, beta-blockers and tricyclic antidepressants were associated with increased odds of OH (OR 7.76 [95% CI 2.51, 24.03]; OR 6.30 [95% CI 2.86, 13.91]). Alpha-blockers, antipsychotics, and SGLT-2 inhibitors were associated with up to 2-fold increased odds of OH, compared to placebo. There was no statistically significant difference in odds of OH with vasodilators (CCBs, ACE inhibitors/ARBs, SSRIs), compared to placebo. Limitations of this study are as follows: data limited to placebo-controlled studies, (excluding head-to-head trials), many RCTs excluded older participants; therefore results may be amplified in older patients in the clinical setting. The study protocol is publicly available on PROSPERO (CRD42020168697).

CONCLUSIONS

Medications prescribed for common conditions (including depression, diabetes, and lower urinary tract symptoms) were associated with significantly increased odds of OH. Drugs causing sympathetic inhibition were associated with significantly increased odds of OH, while most vasodilators were associated with small nonsignificant differences in odds of OH, compared to placebo. Drugs targeting multiple parts of the orthostatic blood pressure (BP) reflex pathway (e.g. sympathetic inhibition, vasodilation, cardio-inhibitory effects) may carry cumulative risk, suggesting that individuals with polypharmacy could benefit from postural BP monitoring.

Experiences of advance care planning in Parkinson's disease and atypical parkinsonian disorders: a mixed methods systematic review

BACKGROUND AND PURPOSE

Advance care planning allows people to plan for their future care needs and can include medical, psychological and social aspects. However, little is known on the use, experience of and attitudes towards advance care planning in patients with parkinsonian disorders, their family carers and healthcare professionals.

METHODS

A systematic search of online databases was conducted in April 2019 using a narrative synthesis approach with thematic analysis and tabulation to synthesize the findings.

RESULTS

In all, 507 articles were identified and 27 were included. There were five overarching themes: (i) what is involved in advance care planning discussions, (ii) when and how advance care planning discussions are initiated, (iii) barriers to advance care planning, (iv) the role of healthcare professionals and (v) the role of the family carer. This evidence was used to highlight eight effective components to support optimal advance care planning in parkinsonian disorders: advance care planning discussions should be individualized in content, timing and approach; patients should be invited to discuss advance care planning early and regularly; palliative care services should be introduced early; a skilled professional should deliver advance care planning; support to family carers should be offered in the advance care planning process; healthcare professionals should be educated on parkinsonian disorders and palliative care; advance care planning should be clearly documented and shared with relevant services; and healthcare professionals should be enabled to conduct effective advance care planning.

CONCLUSIONS

These components can inform best practice in advance care planning in patients with parkinsonian disorders.

Medical student mentoring programs: current insights

Medical school mentoring programs incorporate a wide range of objectives. Clinical mentoring programs help to develop students' clinical skills and can increase interest in under-subscribed specialties. Those that focus on teaching professionalism are integrated into medical school curriculums in order to overcome the "hidden curriculum". Positive mentoring plays a part in reversing the decline of academic medicine, by sparking interest through early research experiences. It also has an important role in encouraging recruitment of under-represented minority groups into the medical profession through widening access programs. The aim of our review of the literature, is to analyze current trends in medical student mentoring programs, taking into account their objectives, execution, and evaluation. We outline the challenges encountered, potential benefits, and key future implications for mentees, mentors, and institutions.

Medical student attitudes and concepts of frailty and delirium

BACKGROUND

Frailty and delirium are important conditions in an ageing population, but there is little evidence exploring medical students' conceptualisation of, or attitudes towards these subjects. We investigated how students' concepts of frailty and delirium changed following a new geriatric medicine module at Manchester medical school.

MATERIALS AND METHODS

Semi-structured interviews were used with students before and after the new teaching week to explore changes in attitude towards frailty and delirium and their conceptualisation. Final year students who had not completed the module were interviewed as a comparison group. Grounded theory and content clouds were employed for data analysis.

RESULTS

Ten 4th year and 11 final year students were interviewed. After the teaching week, 4th year students had a richer conceptualisation of frailty and delirium. Students described structured assessments such as comprehensive geriatric assessment and expressed confidence in their use. Their frameworks were more developed than the final year students who had not had such teaching. Attitudes towards older people, frailty, delirium, and the specialty of geriatric medicine improved following the teaching week.

CONCLUSION

This study shows that geriatric medicine teaching improves students' conceptualisation of frailty and delirium and their understanding of the importance of structured assessments and management plans.

Elderly patients and inflammatory bowel disease

The incidence and prevalence of inflammatory bowel disease (IBD) is increasing globally. Coupled with an ageing population, the number of older patients with IBD is set to increase. The clinical features and therapeutic options in young and elderly patients are comparable but there are some significant differences. The wide differential diagnosis of IBD in elderly patients may result in a delay in diagnosis. The relative dearth of data specific to elderly IBD patients often resulting from their exclusion from pivotal clinical trials and the lack of consensus guidelines have made clinical decisions somewhat challenging. In addition, age specific concerns such as co-morbidity; loco-motor and cognitive function, poly-pharmacy and its consequences need to be taken into account. In applying modern treatment paradigms to the elderly, the clinician must consider the potential for more pronounced adverse effects in this vulnerable group and set appropriate boundaries maximising benefit and minimising harm. Meanwhile, clinicians need to make personalised decisions but as evidence based as possible in the holistic, considered and optimal management of IBD in elderly patients. In this review we will cover the clinical features and therapeutic options of IBD in the elderly; as well as addressing common questions and challenges posed by its management.

A novel association between COMT and BDNF gene polymorphisms and likelihood of symptomatic dysphagia in older people

BACKGROUND

Catechol-O-methyl transferase (COMT) and brain-derived neurotrophic factor (BDNF) are neuro-modulatory proteins that have been demonstrated to affect cortical plasticity, which in turn has been shown to affect age-related changes and neuronal functioning in humans. Here, we tested the hypothesis that single nucleotide polymorphisms (SNP) within COMT and BDNF genes are associated with dysphagia in older adults.

METHODS

A total of 800 community-dwelling older individuals were sent the Sydney Oropharyngeal Dysphagia Questionnaire to identify swallowing difficulties. DNA from this population was available for study and used to genotype 18 COMT and 12 BDNF polymorphisms. Logistic regression statistical models were used to identify potential associations between dysphagia and the genotypes.

KEY RESULTS

A total of 638 individuals completed the questionnaire, giving an 80% response rate. Of these, 538 were genotyped for COMT and BDNF polymorphisms. Age was found to predict dysphagia (p = 0.018, OR = 1.08, CI = 1.01-1.14). The COMT polymorphism rs165599 and the BDNF polymorphism rs10835211 were found to predict dysphagia and have an interactive effect (p = 0.028), which varied according to the carrier status of the other. In the case of SNP rs10835211, the effect of heterozygosity was protective or harmful dependent on the respective status of rs165599.

CONCLUSIONS & INFERENCES

These results suggest that certain interactions between plasticity genes contribute to the development of dysphagia with increasing age. This highlights a possible role for genetic factors in future monitoring and treating individuals affected by dysphagia.