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SYSTEMATIC REVIEW article

Front. Neurosci., 08 February 2024
Sec. Perception Science
This article is part of the Research Topic Vertigo, Tinnitus, and Cognition View all 6 articles

Tinnitus-associated cognitive and psychological impairments: a comprehensive review meta-analysis

\r\nDong Yang&#x;Dong Yang1Dan Zhang&#x;Dan Zhang2Xinmiao ZhangXinmiao Zhang2Xin Li,
Xin Li3,4*
  • 1Department of Otorhinolaryngology, Tianjin Medical University General Hospital, Tianjin, China
  • 2Department of Psychology, Tsinghua University, Beijing, China
  • 3Department of Otorhinolaryngology, Beijing Tsinghua Changgung Hospital, Beijing, China
  • 4School of Clinical Medicine, Tsinghua University, Beijing, China

Background: Tinnitus is strongly associated with an increased risk of cognitive disabilities. The findings of this research will provide valuable support for future investigations aimed at determining the correlation between tinnitus and the risk of cognitive impairments.

Objectives: We investigated the potential correlation between tinnitus and the risk of various cognitive impairments, such as dementia, compromised learning attention, anxiety, depression, and insomnia. The study examined this relationship collectively and by categorizing the data based on different age groups.

Methods: We compiled data from case–control studies and cohort studies obtained from reputable databases such as PubMed, Cochrane Library, and Embase. To minimize potential bias, two reviewers independently assessed the selected articles. After extracting the data, we calculated the pooled odds ratios (ORs) using a random-effects model.

Results: Seventeen relevant studies, comprising an adult population, were included in this analysis. Pooled estimated outcomes revealed a strong association between tinnitus and an elevated risk of dementia-compromised learning, auditory attention, anxiety, depression, and poor sleep quality (P<0.05). Furthermore, the pooled analysis stratified by age demonstrated that patients aged above 60 years, in comparison to those aged 18 to 60 years, exhibited more significant outcomes in relation to the progression of cognitive impairments.

Conclusion: Tinnitus has the potential to increase the risk of cognitive impairments. Moreover, geriatric patients aged above 60 shows a higher susceptibility to developing cognitive disabilities compared to their younger counterparts.

1 Introduction

Tinnitus is a common auditory symptom characterized by the perception of sound in the absence of any external source. It affects millions worldwide and can vary in intensity and duration (Baguley et al., 2013). While the underlying mechanisms of tinnitus are not fully understood, it is believed to arise from complex interactions between the auditory system and the brain (Kompis et al., 2004). Tinnitus can have a significant impact on individuals' quality of life, leading to emotional distress, sleep disturbances, and concentration difficulties. Various factors contribute to its development, including noise exposure, age-related hearing loss, and certain medical conditions (Han et al., 2009). Although there is no cure for tinnitus, management strategies such as sound therapy, cognitive-behavioral therapy, and medication can help to alleviate its symptoms and improve overall wellbeing (Ost, 2014).

Tinnitus has been associated with various underlying medical conditions and diseases. Some examples include age-related hearing loss, ototoxic medications, temporomandibular joint (TMJ) disorders, Meniere's disease, acoustic neuroma, and cardiovascular disorders such as hypertension (Savage and Waddell, 2014). Additionally, mental health conditions such as anxiety, depression, and post-traumatic stress disorder (PTSD) have also been linked to tinnitus (Pattyn et al., 2016). Understanding these associations can aid in the diagnosis and management of tinnitus, as treating the underlying condition may help to alleviate tinnitus symptoms.

Tinnitus has been found to be associated with various cognitive disorders. Studies have shown a higher prevalence of tinnitus in individuals with cognitive impairments such as memory problems and mild cognitive impairment (Jafari et al., 2019; Chu et al., 2020). Cognitive decline and tinnitus may share common underlying mechanisms, including neuroinflammation, oxidative stress, and neurotransmitter imbalances (Paciello et al., 2023). Tinnitus can also contribute to cognitive difficulties, as the constant perception of sound can interfere with attention, concentration, and memory processes (Lan et al., 2020). Furthermore, the emotional distress and psychological impact of tinnitus can exacerbate cognitive symptoms in individuals with existing cognitive disorders. Tinnitus has a significant association with sleep disturbances and insomnia (Alster et al., 1993). The perception of tinnitus can disrupt sleep patterns, making it difficult for individuals to fall asleep or maintain sleep throughout the night. Sleep deprivation and poor sleep quality can further exacerbate tinnitus symptoms, creating a vicious cycle that negatively impacts overall wellbeing (Gallo et al., 2023).

This meta-analysis aimed to investigate the association between tinnitus and various cognitive impairments, including dementia, Parkinsonism, depression, learning and auditory attention, stress, anxiety, and poor sleep quality. Meta-analyses are research studies that analyze and combine data from multiple studies to draw overall conclusions, providing a broader understanding of the topic being studied.

2 Materials and methods

2.1 Search methodology

Different search engines were used to collect data, including the Cochrane Library, PubMed, and Embase databases. The Medical Subject Headings (MeSH) terms included “tinnitus,” “cognitive impairments”, “tinnitus-induced cognitive impairments”, “mild cognitive disabilities,” “dementia,” “tinnitus induced poor sleep,” “tinnitus-induced altered learning,” and “anxiety” as keywords. In addition to conducting a systematic search in PubMed, we utilized the “related articles” feature to broaden our search scope and carefully evaluate the abstracts, studies, and citations. Moreover, our search in the databases was limited to records available in the English language.

2.2 Selection standards for included studies

The search and data collection for this meta-analysis were conducted in 2023. This comprehensive meta-analysis included case–control studies and cohort studies that determined the association of tinnitus with the progression and development of cognitive disorders. This study comprehensively includes published data from various periods, ensuring a comprehensive coverage of the available literature. This meta-analysis has included the research studies conducted in and after 2000, specifically chosen for their utilization of novel outcome variables and the delivery of authentic and reliable results.

To maintain the exclusion criteria, the following points were taken into consideration and applied during the study selection process: (1) exclude animal research, (2) restrict case reports, and studies with insufficient and unpublished data for meta-analysis, (3) exclude articles without proper methodology and outcomes, (4) exclude derivative data sources, such as review articles, (5) exclude studies having pediatric populations or individuals without a confirmed diagnosis of tinnitus, and (6) participants with tinnitus who also had concurrent life-threatening conditions such as cancer and cardiac disorders were excluded from the study to ensure a focused analysis on the specific impact of tinnitus on health outcomes. A broad summary of the characteristics of all the included studies is presented in Table 1.

Table 1
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Table 1. Summary of characteristics of all studies included in the present analysis.

For data retrieval and salvage, the following parameters were taken into consideration: (1) case–control and cohort studies reporting cognitive impairments (e.g., memory loss and attention deficits) and psychological impairments (e.g., anxiety and depression) associated with tinnitus were considered while collecting data, (2) studies with adequate population size, (3) studies with verified measuring methods and statistical analysis, (4) studies with a population including both men and women, (5) studies with an adult population (18 years and above), and (6) research studies with proper analyses and findings were included.

2.3 Description of outcome measures

The State-Trait Anxiety Inventory (STAI) is the outcome measure used to assess anxiety levels and their impact on cognitive functioning. It has been designed to measure both state and trait anxiety. It can be utilized in cognitive impairment detection to assess the impact of anxiety on cognitive functioning (Thomas and Cassady, 2021). The Cognitive Failures Questionnaire (CFQ) is a key tool for understanding the subjective cognitive difficulties of individuals with cognitive impairments. It is employed to measure memory and perception (Volosin et al., 2023). The Symptom Checklist-90-Revised (SCL 90-R) is used for the evaluation of a broad spectrum of psychological symptoms, including anxiety, depression, and attention deficit or obsessive compulsiveness (Shafique et al., 2017). The Pittsburgh Sleep Quality Index (PSQI) is valuable for assessing sleep quality and patterns. Sleep disturbances are often intertwined with cognitive issues, and PSQI provides a standardized approach to assess this critical aspect of wellbeing (Backhaus et al., 2002). Patient Health Questionnaire-9 (PHQ-9) is crucial for evaluating depressive symptoms in the context of cognitive impairments. Its inclusion aids in identifying and quantifying depressive features (Kroenke et al., 2001). The World Health Organization Quality of Life Brief Version (WHOQoL-Bref) serves as a vital measure in cognitive impairment research, offering a comprehensive assessment of the overall quality of life (Whoqol Group, 1998). The Short Form 36-item Health Survey (SF-36) is pivotal in cognitive impairment studies, providing a standardized approach to assess physical and mental health (Brazier et al., 1992). The California Verbal Learning Test (CVLT) is a comprehensive verbal assessment that evaluates auditory attention, learning, and memory functions through a multifactorial approach (Delis et al., 1988). The Hospital Anxiety and Depression Scale (HADS) is an invaluable tool for researchers to examine cognitive impairments and conduct concurrent assessments of anxiety and depression (Bocéréan and Dupret, 2014). The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) is particularly relevant in studies involving older populations, providing an informant-based perspective on cognitive decline. Its use enhances the comprehensive assessment of cognitive impairments, especially in research focused on aging and dementia (Mathew et al., 2022). The Controlled Oral Word Association Test (COWAT) assesses verbal fluency and executive functions by measuring an individual's ability to generate words, providing valuable insights into cognitive outcomes (Ross et al., 2007).

These measures collectively contribute to a comprehensive assessment of cognitive functioning, emotional wellbeing, sleep quality, and overall quality of life, which are relevant aspects in the evaluation of neurodegenerative and cognitive disorders such as Parkinson's disease and dementia.

2.4 Extraction of data

Two distinct investigators independently extracted the data. The data from the included studies were systematically gathered and organized in a standardized data collection spreadsheet on Excel. The included studies provided the following information, which was gathered and compiled for analysis: author name, location, publication year, sample size, gender, age, follow-up period, measuring outcomes, and association of tinnitus with the incidence and progression of cognitive disorders. The process of study selection is visually depicted in the PRISMA flowchart presented in Figure 1. We extracted the odd ratio (OR) and 95% confidence interval (95% CI) from the data presented in research studies to assess the potential risk of developing cognitive disorders associated with tinnitus. Moreover, we arranged the collected data and categorized it on the basis of age, which analyzes the potential variations or trends in the relationship between tinnitus and cognitive impairments across different demographic groups.

Figure 1
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Figure 1. Systemic PRISMA flowchart for meta-analysis.

A Microsoft Excel spreadsheet was created to serve as a comprehensive database for our meta-analysis, comprising all relevant data for analysis. Decisions were compared, and disagreements were resolved by consulting another review author. Any kind of language restriction was not implemented.

2.5 Statistical analyses

For all kinds of statistical analyses in this meta-analysis study, we used Review Manager, Version 5.3 (Cochrane Collaboration, Oxford, England). This study was conducted following the guidelines set forth by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) protocol. ORs of included research studies were extracted to determine the association between tinnitus and the risk of cognitive disorders by a random-effects model. The pooled OR and corresponding 95% confidence interval (CI) were calculated to estimate the incidence of cognitive disorders in patients with tinnitus.

Heterogeneity among the studies was assessed using both the chi-square (χ2) test and the I2 statistic. If Cochran's Q-test yields a P-value below 0.10, it indicates statistically significant heterogeneity among the studies being analyzed.

3 Results

3.1 Description of included studies

We have included 17 studies in this meta-analysis, including both case–control trials and cohort studies. Six studies out of 17 have a population age of 18–60 years, and 11 include a patient population > 60 years old. Moreover, only two studies have a population size of < 100. In all included studies, the risk of cognitive impairments, including dementia, auditory attention and learning, poor sleep quality, anxiety, and depression, was determined in the patients who suffered from tinnitus. In Table 1, the characteristics and findings of the included studies are summarized.

In the case–control trials, outcome measures such as STAI, CFQ, COWAT, CVLT, PSQI, PHQ-9, SCL 90-R, WHOQoL-Bref, SF-36, HADS, and IQCODE, were used for analysis. The current comprehensive meta-analysis was performed, involving a meticulous literature search that identified and included 17 research studies. In the first step, a total of 852 studies were identified via database searching. After removing duplicates and conducting a preliminary screening of full-text articles, a total of 48 articles were assessed for eligibility. Out of these, 31 studies were excluded based on criteria such as duplicate data, limited sample size, unreliable and complex data, poor assessment methodology, and sub-optimal outcomes. The study selection is illustrated in a PRISMA flow diagram (Figure 1).

3.2 Bias risk

The Cochrane Collaboration independently evaluated the potential bias risk for each included study to assess methodological quality. Several research trials showed a high risk, with major sources of bias associated with the appropriateness of randomization, allocation concealment, random sequence generation, and protection from other potential biases. Overall, a moderate risk of bias was identified across the studies, indicating some variability in methodological quality. Supplementary Figure S1 reveals significant variability in study quality, with some studies demonstrating low risk in most domains. However, several studies exhibited limitations, particularly in allocation concealment and blinding.

3.3 Association of tinnitus with cognitive disorders

In the correlation analysis between tinnitus and cognitive disorders, we employed the COWAT, CFQ, WHOQoL-Bref, and SF-36 as the outcome variables to assess cognitive functions in tinnitus patients. A total of 17 cohort and randomized control studies with 62,270 subjects reported adequate data to produce a pooled estimation of the study effect size for tinnitus association with the inducement of cognitive disorders: OR 1.25, 95% CI: 1.11–1.42, P = 0.003; heterogeneity test; I2 = 0%, Chi2 = 0.94 (Figure 2).

Figure 2
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Figure 2. Correlation of tinnitus with the inducement of cognitive disabilities.

3.4 Association of tinnitus with dementia

In the correlation analysis between tinnitus and dementia, we employed the IQCODE as the outcome variable to assess dementia in tinnitus patients. Out of 17 trials, 5 cohort and randomized control studies reported adequate data to produce a pooled estimation of the study effect size for tinnitus association with the inducement of dementia: OR 1.27, 95% CI: 0.97–1.65, P = 0.08; heterogeneity test; I2 = 0%, Chi2 = 0.24 (Figure 3).

Figure 3
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Figure 3. Correlation of tinnitus with the inducement of dementia.

3.5 Association of tinnitus with learning and auditory attention

In the correlation analysis between tinnitus and learning disorders, CVLT and COWAT were used as outcome variants, and researchers retracted the relevant data from ongoing large-scale population-based cross-sectional studies. Out of 17 trials, 4 cohort and randomized control studies reported adequate data to produce a pooled estimation of the study effect size for tinnitus association with the inducement of learning and auditory attention defects: OR 1.29, 95% CI: 1.06–1.58, P = 0.01; heterogeneity test; I2 = 0%, Chi2 = 0.28 (Figure 4).

Figure 4
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Figure 4. Correlation of tinnitus with the learning and auditory attention deficit.

3.6 Association of tinnitus with poor sleep quality

In the correlation analysis between tinnitus and sleep quality, we employed the PSQI as the outcome variable to assess sleep quality in tinnitus patients. Out of 17 trials, 4 cohort and randomized control studies reported adequate data to produce a pooled estimation of the study effect size for tinnitus association with the inducement of poor sleep quality: OR 1.35, 95% CI: 0.85–2.15, P = 0.21; heterogeneity test; I2 = 0%, Chi2 = 0.02 (Figure 5).

Figure 5
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Figure 5. Correlation of tinnitus with the inducement of sleep disturbances.

3.7 Association of tinnitus with anxiety

In the correlation analysis between tinnitus and anxiety, we employed the STAI, HADS, and SCL 90-R as the outcome variables to assess anxiety in tinnitus patients. Out of 17 trials, 6 cohort and randomized control studies reported adequate data to produce a pooled estimation of the study effect size for tinnitus association with the inducement of anxiety: OR 1.29, 95% CI: 1.02–1.64, P = 0.04; heterogeneity test; I2 = 0%, Chi2 = 0.83 (Figure 6).

Figure 6
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Figure 6. Correlation of tinnitus with the inducement of anxiety.

3.8 Association of tinnitus with depression

In the correlation analysis between tinnitus and depression, we employed the PHQ-9, HADS, and SCL 90-R as the outcome variables to assess depression in tinnitus patients. Out of 17 trials, 8 cohort and randomized control studies reported adequate data to produce a pooled estimation of the study effect size for tinnitus association with the inducement of depression: OR 1.20, 95% CI: 0.94–1.52, P = 0.14; heterogeneity test; I2 = 0%, Chi2 = 0.67 (Figure 7).

Figure 7
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Figure 7. Correlation of tinnitus with the inducement of depression.

3.9 Association of tinnitus with cognitive disorders in patients 18–60 years old

Out of 17 trials, 6 cohort and randomized control studies reported adequate data to produce a pooled estimation of the study effect size for tinnitus association with the inducement of cognitive impartments in the 18–60-year-old study population; OR 1.23, 95% CI: 1.06–1.44, P = 0.007; heterogeneity test; I2 = 0%, Chi2 = 0.21 (Figure 8).

Figure 8
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Figure 8. Correlation of tinnitus with the inducement of cognitive disorders in 18- to 60-year-old study population.

3.10 Association of tinnitus with cognitive disorders in patients 60 years and older

Out of 17 trials, 11 cohort and randomized control studies reported adequate data to produce a pooled estimation of the study effect size for tinnitus association with the inducement of cognitive disorders in the > 60-year-old study population: OR 1.29, 95% CI: 1.06–1.58, P = 0.01; heterogeneity test; I2 = 0%, Chi2 = 0.43 (Figure 9).

Figure 9
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Figure 9. Correlation of tinnitus with the inducement of cognitive disorders in > 60-year-old study population.

4 Discussion

This comprehensive review meta-analysis study included 17 studies with 62,270 study participants, which provided data for analysis. The estimated pooled analysis outcomes of our study revealed that tinnitus has a strong association with the inducement of dementia, anxiety, altered learning and auditory attention, depression, and sleep disruption in tinnitus patients, especially elderly patients. Tinnitus has been identified as an independent risk factor for both dementia and Parkinson's disease (Chu et al., 2020). Moreover, multiple research studies have consistently concluded that there is a notable increase in the incidence and progression of dementia among individuals with tinnitus (Deal et al., 2017; Golub et al., 2017).

In this comprehensive meta-analysis, for the first time, we have established a correlation between tinnitus and cognitive impairments by analyzing population-based cohort studies and randomized case–controlled studies. Our investigation focused on the association of tinnitus with the risk of cognitive distress, including dementia, altered learning attention, poor sleep quality, anxiety, and depression. Furthermore, in this study, we stratified the subjects into subgroups based on age. The pooled analysis findings of the tinnitus population revealed a significant association with several cognitive impairments, including dementia, impaired learning and auditory attention, anxiety, depression, and severe insomnia. Remarkably, we found an elevated risk of cognitive impairments in both the age groups of 18 and 60. However, when comparing the population aged > 60 (older patients) with those aged 18–60 years, it was found that the group of older patients suffering from tinnitus exhibited a notably stronger association with the development of cognitive disorders. These findings suggest that elderly patients are more susceptible to the onset of cognitive impairments.

In a previous meta-analysis review study, it was found that tinnitus disturbs cognitive functionality and significantly increases the risk of short-term memory loss or dementia (Clarke et al., 2020). Another meta-analysis study highlighted a strong association between tinnitus and cognitive disability. The findings indicated that individuals with tinnitus often faced concurrent conditions such as depression, poor sleep, and anxiety (Clarke et al., 2018). A recently published study has unveiled that elderly tinnitus patients face a considerably higher risk of dementia, and they also exhibit associations with other cognitive impairments, including anxiety, depression, and sleep difficulties (Malesci et al., 2021). However, contrary to expectations, an investigational study conducted in 2021 revealed a positive association between tinnitus and enhanced cognitive performance in non-Hispanic elderly individuals with hearing loss. These unexpected findings suggest that ethnicity plays a significant role in disease expression. Therefore, to further consolidate and comprehend such results, future investigations should incorporate longitudinal research studies for comprehensive validation and mechanistic insights (Hamza and Zeng, 2021).

To protect tinnitus patients from developing cognitive impairments, a comprehensive approach is crucial. The approach should include implementing effective tinnitus management with sound therapy and counseling; promoting a healthy lifestyle with regular exercise and a balanced diet; scheduling regular medical check-ups to monitor cognitive health; identifying potential issues early on; reviewing medications with healthcare providers for potential cognitive side effects (Han et al., 2009), and empowering patients with educational support and resources to manage both tinnitus and cognitive health effectively (Kompis et al., 2004). Further advanced research studies are required in this field to provide a more comprehensive understanding of the association between tinnitus and cognitive impairments.

Our findings indicated a strong association between tinnitus and the risk of cognitive disabilities. However, there are some study limitations in this meta-analysis, including variations in follow-up periods, diverse analytical measuring methods, questionnaires across studies, the absence of methodological quality assessments for the included studies, and different population sizes.

5 Conclusion

In our meta-analysis study, we found a strong association between tinnitus and the risk of cognitive impairments in patients suffering from tinnitus. Moreover, it was evident that elderly tinnitus patients (>60 years old) exhibited a significantly higher susceptibility to developing cognitive impairments, particularly dementia, compared to younger individuals.

Data availability statement

The original contributions presented in the study are included in the article/Supplementary material, further inquiries can be directed to the corresponding author.

Author contributions

DY: Conceptualization, Formal analysis, Methodology, Writing—original draft. DZ: Conceptualization, Formal analysis, Methodology, Writing—original draft. XZ: Software, Validation, Writing—original draft. XL: Supervision, Writing—review & editing.

Funding

The author(s) declare that no financial support was received for the research, authorship, and/or publication of this article.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher's note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Supplementary material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fnins.2024.1275560/full#supplementary-material

Supplementary Figure S1. Risk of bias of the included studies in the meta-analysis study.

Supplementary Table S1. Details of various parameters and criteria used in this study.

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Keywords: tinnitus, cognitive and psychological impairments disorders, Alzheimer's disease, dementia, poor sleep quality, anxiety, learning and auditory attention, attention deficit disorder

Citation: Yang D, Zhang D, Zhang X and Li X (2024) Tinnitus-associated cognitive and psychological impairments: a comprehensive review meta-analysis. Front. Neurosci. 18:1275560. doi: 10.3389/fnins.2024.1275560

Received: 10 August 2023; Accepted: 09 January 2024;
Published: 08 February 2024.

Edited by:

Hubertus Axer, Jena University Hospital, Germany

Reviewed by:

Stephanie Rosemann, University of Oldenburg, Germany
Qingwei Ruan, Fudan University, China
Haúla Faruk Haider, CUF Infante Santo Hospital, Portugal

Copyright © 2024 Yang, Zhang, Zhang and Li. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Xin Li, ZW50bGl4aW50c2luZ2h1YSYjeDAwMDQwO291dGxvb2suY29t

These authors have contributed equally to this work

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