Cognitive Behavioral Therapy For Alleviating The Distress Caused By Tinnitus, Hyperacusis And Misophonia: Current Perspectives

Introduction

Definition And Psychological Consequences Of Tinnitus

Tinnitus is the perception of sounds in the absence of external acoustic stimulation. Common descriptions of tinnitus are: buzzing noise, high-pitched noise, hissing, whistle, waterfall, grinding wheel, ringing, white noise, wind noise, bubbles, clicks, beeps, static noise and humming.^1,2 About 20% of patients are unable to describe what their tinnitus sounds like.¹ Most people who experience tinnitus also have some degree of hearing loss, but not all people with hearing loss have tinnitus.^3–6 A recent study of patients who attended a Tinnitus and Hyperacusis Therapy Specialist Clinic (n = 445) in the UK showed that the perceived loudness of tinnitus was related to the severity of hearing loss, with a regression coefficient, b = 0.022 (p<0.001).⁶ The pathophysiology of tinnitus is not fully understood and there is at present no “cure” for tinnitus that results in the tinnitus becoming inaudible.

The emotional and psychological impact of tinnitus has been studied extensively.^7–11 Aazh and Salvi⁶ showed that tinnitus annoyance was significantly associated with tinnitus loudness (regression coefficient, b = 0.49, p<0.001). Zeman, Koller, et al¹² reported that scores on the Tinnitus Handicap Inventory (THI)¹³ were significantly predicted by scores on the Beck Depression Inventory (BDI).¹⁴ Based on a national survey in Sweden, Hebert, Canlon, et al¹⁵ reported that depressive symptoms significantly predicted the severity of the distress caused by tinnitus. Trevis, McLachlan, et al¹⁶ reported that depression as measured via the BDI was predicted by tinnitus handicap as measured via the THI (regression coefficient, b = 0.31, p<0.001). Aazh and Moore¹⁷ reported that there was a significant correlation between scores on the THI and suicidal and/or self-harm ideations (r = 0.21, p = 0.01). Several other studies, reviewed by Durai and Searchfield,¹⁸ have reported associations between tinnitus and depression. A recent study (n = 621) showed that the relationship between tinnitus loudness and depression as measured via the Hospital Anxiety and Depression Scale (depression subscale) (HADS-D)¹⁹ was fully mediated via tinnitus handicap as measured via the THI, sleep disturbances as measured via the Insomnia Severity Index (ISI),²⁰ hyperacusis as measured via the Hyperacusis Questionnaire (HQ),²¹ and anxiety as measured via the Hospital Anxiety and Depression Scale (anxiety subscale) (HADS-A).¹⁹

These findings are consistent with Cognitive Behavioral Therapy (CBT) conceptual models for tinnitus distress, which are based on the assumption that cognitive processes are involved in creating tinnitus-related distress.^22,23 CBT models are based on the idea that tinnitus-related distress can be alleviated even when there is no decrease in tinnitus loudness, if the underlying thought processes are successfully modified.²⁴

Definition And Psychological Consequences Of Hyperacusis

Hyperacusis is intolerance of certain everyday sounds that causes significant distress and impairment in social, occupational, recreational, and other day-to-day activities.²⁵ The sounds may be perceived as uncomfortably loud, unpleasant, frightening, or painful.²⁶ There may be several sub-types of hyperacusis, including pain hyperacusis (the experience of pain in response to certain sounds) and fear hyperacusis (fear evoked by certain sounds), and these may occur singly or in combination.²⁶ Tinnitus and hyperacusis often co-occur, as highlighted by Tyler and Conrad Armes.²⁷ A study using the Tinnitus Research Initiative (TRI) Database showed that 55% of patients (935/1713) who had tinnitus also had hyperacusis.²⁸ The underlying mechanisms of hyperacusis are not understood and currently, like tinnitus, there is no proven “cure” for hyperacusis.^29,30

Hyperacusis can cause substantial discomfort, inability to access public services, and problems with health and education.²⁹ Research studies have shown that over 50% of patients with hyperacusis also suffer from some form of psychiatric disorders.^11,31 A recent study in the UK of 139 patients with tinnitus and hyperacusis reported a small but significant correlation between suicidal and self-harm ideations and hyperacusis severity (r = 0.18, p = 0.036).¹⁷ In the absence of a cure, several authors have suggested the use of CBT to alleviate hyperacusis-related distress.^32–34 Through collaborative work between specialists in audiology and clinical psychology, Aazh and Allott³⁵ published a CBT protocol for hyperacusis rehabilitation.

Definition And Psychological Consequences Of Misophonia

Misophonia is defined as an abnormally strong emotional and behavioral reaction to particular sounds or groups of sounds with a specific pattern and meaning to the patient.³⁶ In other words, it is a hatred or dislike of certain sounds, for example, chewing sounds or slurping sounds. Misophonia can have a great impact on the life of the sufferer, leading to disability and social isolation.³⁷ A consensus paper bringing together experts from a wide range of disciplines suggested using the term “annoyance hyperacusis” for the experience of negative emotional reactions to sound, instead of misophonia.²⁶ Most research studies in the field of audiology have not distinguished misophonia from hyperacusis.^{28,33,38–42} Jastreboff and Jastreboff⁴³ reported that misophonia is always experienced in cases of severe hyperacusis. Recent studies conducted in the UK suggest that severe hyperacusis is typically characterised by strong across-frequency variations in sensitivity to sound, which is an indication of adverse reactions only to specific sounds, a feature associated with misophonia.^44,45

In the field of psychiatry, there is a growing debate about whether misophonia is a distinct psychiatric disorder.^46,47 The most common comorbid psychological disorders for individuals who experience misophonia are post-traumatic stress disorder, obsessive-compulsive disorder (OCD) and obsessive-compulsive personality disorder.^46,48,49 Although misophonia is not listed in any major psychiatric classification system, a few psychiatric clinics have reported treating such patients.^46,50–52 Systematic studies of misophonia are very limited. Based on the literature it is not clear whether misophonia is a symptom of a distinct psychiatric disorder or a variety of hyperacusis that is often co-morbid with neuropsychiatric disorders.⁵³ Several authors have reported promising results using CBT to help patients with misophonia.^50,51,54

CBT For Tinnitus, Hyperacusis And Misophonia

Although it is not clear whether there are causal relationships between anxiety, tinnitus, hyperacusis, and misophonia, there is a growing body of evidence suggesting links between them.^11,55 In the absence of a cure, treatment of the depressive and anxiety components of the conditions could be beneficial. CBT is a psychological intervention that aims to alleviate anxiety by helping the patient to modify their dysfunctional cognitions, ruminations and safety-seeking behaviors.^56,57

CBT is based on the use of models to characterize the mechanisms by which tinnitus or certain sounds (in the case of hyperacusis and misophonia) adversely affect the patient’s activities or mood.⁵⁸ Examples of CBT models for tinnitus, hyperacusis and misophonia are shown in Figures 1–3, respectively. Note that the three models have some similarities, and as a consequence the general structure of CBT is similar for tinnitus, hyperacusis and misophonia. The CBT models that are proposed in this paper begin with the initial emotional response and physical sensations related to the experience of tinnitus, hyperacusis and misophonia. These initial responses and sensations evoke negative thoughts, leading to further negative emotions and physical sensations, and to more evaluative thoughts and these in turn feed back into the patient’s emotional responses and physical sensations. Thus, a vicious cycle is formed, leading to exacerbation of their symptoms.^22,23,59

Figure 1 Case formulation illustrating a model for tinnitus-induced distress.

The method of delivering CBT for alleviating the distress caused by tinnitus and sound intolerance varies significantly across different settings. Although CBT is typically administered by appropriately trained psychotherapists, psychiatrists and psychologists, the majority of patients with tinnitus and hyperacusis are referred to audiology departments rather than being referred to mental health services,²⁹ mainly due the auditory nature of such disorders. In the UK, tinnitus and/or hyperacusis-specific CBT is usually provided by specialized audiologists. In such settings, patients are usually screened for psychological disorders and are referred to mental health services when indicated.¹¹ In other countries, a wide range of health and social care professionals may be involved in offering CBT focused on tinnitus and sound intolerance disorders.^33,60 In some centers, patients with tinnitus and hyperacusis are offered CBT via the internet or self-help materials, with minimal contact with professionals.^61,62

The next section of this article reviews evidence related to the clinical efficacy of CBT applied in a variety of ways for the alleviation of tinnitus, hyperacusis and misophonia.

The Efficacy Of CBT

CBT For Tinnitus

There are several meta-analyses assessing the overall outcomes of randomized controlled trials (RCTs) of the efficacy of CBT for the alleviation of tinnitus.^63–67 Most of the RCTS included a “passive” control group, who were on a waiting list, and/or an “active” control group, who received another intervention, such as yoga or education about tinnitus.

Martinez-Devesa, Perera, et al⁶³ included eight RCTs in their analysis.^62,68–73 There was a tendency for tinnitus loudness to decrease for all groups (treatment, passive control, and active control), but the decrease did not differ significantly across groups. The effect size for CBT versus passive control was only 0.24 (95% confidence interval, CI: –0.02 to 0.51) and the effect size for CBT versus active control was only 0.1 (95% confidence interval, CI: –0.22 to 0.42). However, tinnitus distress as measured via self-report questionnaires, the THI and the tinnitus quotient, TQ,⁷⁴ decreased significantly more for the CBT group than for the passive control group (effect size: 0.91, 95% CI 0.50 to 1.32) and than for the active control group (effect size: 0.64, 95% CI: 0.29 to 1.00).

Hesser, Weise, et al⁶⁴ included 15 RCTs in their analysis.^{62,68–73,75–81} CBT significantly reduced distress and annoyance. The effect sizes for CBT compared with passive control were 0.7 (95% CI: 0.56 to 0.84) for tinnitus distress and 0.35 (95% CI: 0.21 to 0.50) for measures of mood. The effect sizes for CBT compared with active control were 0.44 (95% CI: 0.16 to 0.72) for tinnitus distress and 0.42 (95% CI: 0.09 to 0.74) for measures of mood. Hesser, Weise, et al⁶⁴ concluded that CBT is effective in reducing the annoyance and distress associated with tinnitus.

Hoare, Kowalkowski, et al⁶⁶ included eight RCTs in their meta-analyses. Studies conducted up to 2010 were included. Two RCTs^75,82 compared internet-based CBT with control (in one study a waiting list control was used and in the other an internet education with no CBT component was offered to the control group), using the Tinnitus Reaction Questionnaire (TRQ).⁸³ CBT had a greater effect than control, with a pooled effect size of 0.38 (95% CI: 0.07 to 0.68). Three RCTs compared CBT delivered by mental health professionals with waiting list control using TRQ total scores pre-intervention and post-intervention.^68,73,84 CBT had a greater effect than control, with a pooled effect size of 0.54 (95% CI: 0.12 to 0.96). Three RCTs compared CBT delivered by mental health professionals with control using the TQ pre-intervention and post-intervention (the control conditions were waiting list in one study, education and relaxation techniques in one study, and tinnitus retraining therapy in one study).^69,71,79 CBT had a greater effect than control, with a pooled effect size of 0.64 (95% CI: 0.31 to 0.98). Hoare, Kowalkowski, et al⁶⁶ concluded that although the overall quality of the RCTs was only moderate, there was sufficient consistency across studies to be confident of the benefit of CBT delivered via mental health professionals for tinnitus intrusiveness.

Nyenhuis, Golm, et al⁸⁵ analyzed 10 RCTs that assessed the efficacy of various forms of self-help CBT comprising internet-delivered CBT, bibliotherapy, self-help book, and self-help manual.^{61,62,75,80,82,86–89} Studies published up to early 2012 were included in the analysis. Most studies included a passive control group that received information only. Nyenhuis, Golm, et al⁸⁵ reported that self-help CBT significantly reduced tinnitus distress (pooled effect size = 0.54, 95% CI: 0.30 to 0.77) and depression scores (pooled effect size = 0.38, 95% CI: 0.23 to 0.53) when compared with passive controls at post-assessment. There was no significant difference in effect sizes between self-help CBT and face-to-face CBT (group treatment and counseling). They concluded that self-help CBT was effective in reducing tinnitus distress. However, they emphasized that although their results suggested comparable effectiveness of self-help and face-to-face CBT, there were only four studies that compared the two forms of treatment and for three of these the CBT was administered in a group rather than individual setting.

Grewal, Spielmann, et al⁶⁵ analyzed eight RCTs that evaluated the effectiveness of CBT and also of Tinnitus Retraining Therapy (TRT),⁹⁰ which has been widely used for the alleviation of tinnitus. Studies published up to 2011 were included in the analysis.^{62,68–73,79} All of the included RCTs were ranked as having a low risk of bias that would significantly alter the results.⁹¹ Grewal, Spielmann, et al⁶⁵ concluded that both CBT and TRT are effective in reducing tinnitus distress and depressive symptoms as measured via self-report questionnaires. Subjective tinnitus loudness was assessed only for CBT and was not reduced. The authors concluded that there was insufficient evidence to determine whether CBT or TRT was more effective.

Zenner, Delb, et al⁶⁷ reviewed several RCTs and review studies assessing the effect of CBT on tinnitus distress and quality of life.^{62,68,69,72,79,92,93} They did not report the details of their statistical analysis and their paper was mainly descriptive. Nevertheless, the conclusion was that tinnitus-specific CBT (administered either individually or in groups) is highly effective in alleviating tinnitus distress, depression scores, and improving the quality of life. Two RCTs that were not included in the above-mentioned reviews were conducted by Cima, Maes, et al⁹⁴ and Maes, Cima, et al⁶⁰ We briefly discuss their results here. Cima, Maes, et al.⁹⁴ compared two groups. Both received sound therapy and tinnitus education sessions, and one group additionally received 12 weeks of CBT from clinical psychologists. The mean THI score for patients who received CBT improved from 39 (standard deviation, SD = 23, n = 245) to 29 (SD = 21, n = 175) after the full course of treatment, which lasted for 8 months. This change was significantly greater than the change in mean THI score from 39 (SD = 23) (n = 247) to 34 (SD = 25) (n = 161) for patients who did not receive CBT. The effect size of the CBT evaluated 12-months post-treatment was 0.24 (p = 0.0009) when measured using the Health Utilities Index mark 3 (HUI),⁹⁵ 0.43 (p <0.0001) for the TQ, and 0.45 (p<0.0001) for the THI. Maes, Cima, et al⁶⁰ assessed the cost-effectiveness of CBT for tinnitus when combined with the usual care (education, sound therapy and counseling, n = 247) compared with usual care alone (n = 245). They calculated the change in quality-adjusted life years (QALY) based on health state utilities measured via the HUI mark 3. Compared with patients receiving the usual care, those who additionally received CBT gained on average 0.015 QALYs (95% bootstrapped CI: –0.03 to 0.06). Maes, Cima, et al⁶⁰ concluded that CBT combined with usual care is cost-effective compared with usual care only.

There are some recent studies on audiologist-guided internet-based CBT for tinnitus.^96,97 Beukes, Andersson, et al⁹⁶ compared eight weeks of audiologist-guided internet-based CBT with two or three face-to-face appointments including education and counseling with no CBT component. The internet-based CBT comprised 16 recommended modules and five optional modules. The content included relaxation, thought analysis, cognitive restructuring, imagery, and exposure techniques. The role of the audiologist was to provide feedback on progress, encouragement, and information about the content of new modules. A minimum of 10 mins audiologist time per week was spent on each participant, with more time if required. Seventy-four patients out of 92 who were randomized to the internet-CBT group completed the study. Tinnitus Functional Index (TFI)⁹⁸ scores improved with the treatment for both groups and the difference between the two groups was not statistically significant. In another RCT, Beukes, Baguley, et al⁹⁷ randomly assigned participants to receive eight weeks of audiologist-guided internet-based CBT (intervention group) or eight weeks of monitoring (control group). Sixty three out of 73 patients who were randomized to the intervention group completed the treatment and all patients randomized to the control group (n = 72) completed the control assessments. TFI scores improved significantly more for the intervention group than for the control group. The effect size was 0.7 (95% CI: 0.4 to 1.0).

A recent retrospective study assessed the effectiveness of CBT for tinnitus delivered by audiologists working in the National Health Service in the UK (n = 68).²⁴ The audiologists were specialized in tinnitus and hyperacusis rehabilitation and had attended a Tinnitus and Hyperacusis Therapy Masterclass focusing on 1) psychological and audiological assessment of tinnitus and hyperacusis,^11,99 2) client-centered counseling skills,¹⁰⁰ 3) special CBT skills required for management of tinnitus and hyperacusis,^35,101 and 4) motivational interviewing skills.^102–104 The study was not an RCT as it did not have a control group. THI scores improved significantly post intervention. The effect size for patients who completed the CBT was 1.13. An intention-to-treat analysis,¹⁰⁵ including those who dropped out in order to avoid any selection bias, also showed significant improvements in THI.

In summary, the meta-analyses and studies reviewed above all indicate that CBT is effective in alleviating the distress caused by tinnitus compared to passive control groups and in some cases compared to active control groups. CBT was usually not found to reduce the loudness of tinnitus. CBT can be effective when delivered in a group setting rather than individually. CBT can also be effective when delivered via the internet, when combined with appropriate help from audiologists. It is unclear whether CBT is more effective than some other active forms of tinnitus treatment, such as TRT.

CBT For Hyperacusis

The CBT model for hyperacusis (Figure 2) begins with the initial emotions (eg, anxiety) and physical sensations (eg, pain) resulting from the trigger sound.^24,59 Intolerance to sound as the result of extreme loudness perception or pain are defined as loudness hyperacusis and pain hyperacusis, respectively.²⁶ In individuals with hyperacusis-related distress, these initial emotions and sensations are typically followed by a vicious cycle involving negative thoughts leading to further negative emotions and physical sensations, and to more evaluative thoughts, which feed back into the patient’s emotional reaction leading to exacerbation of their symptoms. The CBT intervention for hyperacusis distress aims to break the vicious cycle by helping the individual to explore their negative thought processes and to modify them.

Figure 2 Case formulation illustrating a model for hyperacusis-induced distress.

To the authors’ knowledge, there are only four published studies on the effectiveness of CBT for hyperacusis. Juris, Andersson, et al³³ conducted an RCT on the effect of CBT for patients who reported hyperacusis as their main problem. They randomly assigned 30 patients to the CBT group and 32 patients to a passive waiting-list control group. Patients in the CBT group received six sessions of CBT delivered by qualified psychologists, while patients in the waiting-list group received no intervention beyond the assessment of their baseline measures. There were only four drop outs and no intention-to-treat analysis was performed. Scores on the HQ improved significantly for both groups by the end of the study, but the improvement was significantly larger for the CBT group. The difference in pre- and post-treatment scores on the HQ was 8.3 (SD = 7) for the CBT group and 4.1 (SD = 6) for the waiting-list group. There was no significant difference between groups in the reduction of the anxiety score as measured via the HADS. A weakness of the study of Juris, Andersson, et al³³ was the use of only a passive control group. It would have been better to include an active control group that received some form of treatment involving therapy, but without the specific content of CBT.

In studies of audiologist-guided internet-based CBT,^96,97 the outcome for hyperacusis was also reported. Beukes, Andersson, et al⁹⁶ compared the effects of eight weeks of audiologist-guided internet-based CBT with two or three face-to-face appointments including education and counseling with no CBT component. The internet-based CBT comprised 16 recommended modules and five optional modules, as described earlier. The improvement in HQ score following treatment did not differ significantly for the two groups. The effect size was 0.16 (95% CI, –0.26 to 0.57). In other words, the two interventions were equally effective in reducing hyperacusis handicap. In another RCT, Beukes, Baguley, et al⁹⁷ randomly assigned participants to receive eight weeks of audiologist-guided internet-based CBT (intervention group) or eight weeks of monitoring (control group). Sixty three out of 73 patients who were randomized to the intervention group completed the treatment and all patients randomized to the control group (n = 72) completed the control assessments. The audiologist-guided internet-based CBT led to a slightly greater improvement in HQ scores than for the control group, but the effect was only marginally significant. The effect size was 0.3 (95% CI = 0.0 to 0.7).

Aazh and Moore²⁴ conducted a retrospective study comparing hyperacusis-related distress before and after CBT delivered by audiologists trained in the delivery of CBT (n = 68). For the subgroup of patients (n = 14) with a diagnosis of hyperacusis based on an HQ score ≥22⁴⁴ who completed the course of CBT, the mean pre-CBT HQ score was 29.5 (SD = 4.4) and the mean post-CBT score was 20.8 (SD = 6.7), an 8.7-point improvement (p = 0.0003). Aazh and Moore²⁴ also conducted an intention-to-treat analysis,¹⁰⁵ in order to avoid any selection bias resulting from patients dropping out. The results showed that for the subgroup of patients with hyperacusis based on HQ scores ≥22 (n = 22), the mean pre-CBT HQ score was 29.5 (SD = 5.1) while the mean post-treatment score was 23.2 (SD = 8.1), a 6.4-point improvement (p = 0.0004). Because this study did not have a control group, it is difficult to assess the extent to which the measured improvements were produced specifically by the CBT as opposed to being a more general effect of receiving treatment (placebo effect).¹⁰⁶ Studies with an RCT design, including long-term follow up, are needed to assess more accurately the efficacy of audiologist-delivered CBT for the management of tinnitus and hyperacusis. However, the results were encouraging, since the effect sizes were medium or large.¹⁰⁷

In summary, the limited amount of available evidence supports the idea that CBT is effective in reducing hyperacusis handicap as measured via the HQ. However, RCTs with active control groups are needed to establish more conclusively the benefits of CBT in alleviating hyperacusis handicap.

CBT For Misophonia

The CBT model for misophonia (Figure 3) begins with the initial emotional responses (eg, anger, irritation) and physical sensations (eg, stomach tightening, static-like tingling sensations on the skin⁴⁹) to a specific set of trigger sounds. Typical examples of such sounds are chewing or crunching food, gum popping or chewing, lip smacking, nose sniffing, breathing, clicking sounds, and tapping noises.^26,108 In individuals with misophonia-related distress, these initial emotional reactions and physical sensations are typically followed by a vicious cycle involving negative thoughts leading to further negative emotions and physical sensations, and to more evaluative thoughts that feed back into the patient’s emotional reaction, leading to exacerbation of their negative feelings about the trigger sounds. In addition, the observation of specific movements or anticipation of the trigger sounds can trigger intense aversive responses associated with feelings of distress, disgust, irritability, and anger, which lead to increased focus on the sound source.^46,108 The CBT intervention for misophonia-related distress aims to break the vicious cycle by helping the individual to explore their negative thought processes and to modify them. Unfortunately, there appear to be no published RCTs evaluating the effectiveness of CBT in alleviating the distress caused by misophonia. Therefore, the review below is based on case studies.

Figure 3 Case formulation illustrating a model for misophonia-induced distress.

Reid, Guzick, et al¹⁰⁹ reported a case of an adolescent with OCD and misophonia. The treatment involved CBT combined with exposure to and response prevention for trigger sounds. Misophonia symptoms were significantly reduced during treatment, but the contribution of the CBT to this improvement is not clear. There are two case reports of a counter-conditioning method called “Neural Repatterning” combined with relaxation therapy.^110,111 Misophonia symptoms were reduced following treatment. It should be noted that the treatment here involved behavioral therapy, and did not include the specific content of CBT.

There are two case reports on the effect of CBT on misophonia.^50,51 Bernstein, Angell, et al.⁵⁰ reported a case of a 19-year old female who was intensely irritated by other people slurping, swallowing, and chewing. Her self-report scores on the Beck depression and anxiety questionnaires¹⁴ were within the normal range and no Axis I disorders (all psychological diagnostic categories except mental retardation and personality disorder) were identified using the structured clinical interview of DSM-IV.¹¹² The patient received six sessions of CBT and showed improvement in her misophonia symptoms. The patient still found trigger noises to be unpleasant, but these no longer interrupted her day-to-day activities and did not affect her mood.

McGuire, Wu, et al⁵¹ reported two cases of teenagers with irritability and anxiety produced by other people slurping, swallowing, chewing, sniffing, tapping, and breathing. The teenagers did not seem to have any psychiatric co-morbidity. They received between 10 and 18 CBT sessions focused on their sound-annoyance symptoms. The symptoms following the treatment were improved, as shown by reductions in scores for self-report questionnaires. The parents of the teenagers reported that the trigger sounds no longer disrupted family functioning.

Schroder, Vulink, et al⁵⁴ reported the results of CBT for 90 patients with misophonia (mean age = 36 years, SD =12 years). Over 70% of the patients were female. The patients were assessed and diagnosed by psychiatrists who had experience with OCD and related disorders. The CBT sessions were given weekly for seven to eight weeks in a group setting. Each session lasted for four hours and comprised: psychological education, psychomotor therapy, counter-conditioning, and counseling. There were four to nine patients per group and the CBT was delivered by clinical psychologists with extensive experience in CBT for OCD. The Amsterdam Misophonia Scale (A-MISO-S)⁴⁶ was administered by a trained psychiatry resident at three time points, comprising: T0 (initial assessment), T1 (prior to the start of the CBT), which was on average 29 weeks (SD = 16 weeks) after the initial assessment, and T2 (end of the treatment). All patients were added to a waiting list after the initial assessment, which led to the time lapse between T0 and T1. The mean A-MISO-S score was 13.6 (SD = 2.9) at T0 and remained unchanged at T1. The mean A-MISO-S score was reduced (improved) by 4.5 points (SD = 3.5) at T2 (p<0.001). This suggests that CBT delivered in group setting is helpful for patients with misophonia.

In summary, the limited available evidence suggests that CBT is effective in treating misophonia. However, there is a lack of RCTs. Future studies should include one or more control groups, preferably including an active control group, randomization of patients to groups, and the use of validated misophonia outcome measures.

Patients’ Views Of The Effectiveness Of CBT

For CBT to be effective, and for the course of treatment to be completed, the patient must be motivated appropriately. Patients with tinnitus and hyperacusis often use internet-based sites to find out more about their condition and to explore the treatment options available to them. They also may meet other sufferers via self-help groups. The opinion of others who have received various forms of treatment can be important in the decision of a patient to seek help and in the decision about whether to undergo CBT, if offered. Therefore, it is important to ascertain whether or not CBT is viewed as acceptable and effective by patients who have received CBT. Aazh, Moore, et al²⁵ assessed patients’ views about the effectiveness of audiologist-delivered CBT for the management of tinnitus and hyperacusis. Of 77 patients who received audiologist-delivered CBT as a part of their tinnitus and/or hyperacusis rehabilitation, 65% ranked its effectiveness as 5/5 (where 1 is no effect and 5 is very effective) and 29% ranked it as 4/5. Patients’ feedback about audiologist-delivered CBT did not differ significantly between patients with tinnitus only and those with hyperacusis (with or without tinnitus). Thus, audiologist-delivered CBT was viewed very positively by the great majority of patients who received it for the treatment of tinnitus and hyperacusis.

Conclusion

There is strong evidence from RCTs supporting the effectiveness of CBT in alleviating the distress caused by tinnitus in comparison to passive control groups and sometimes active control groups. CBT for tinnitus can be effective both in individual and in group settings, whether delivered by psychiatrists, clinical psychologists, or specially trained audiologists. CBT for tinnitus can also be effective when delivered via the internet, when combined with help from audiologists. CBT does not usually reduce the loudness of tinnitus. Further RCTs are needed to establish whether CBT is more effective than some other forms of psychological interventions.

Case studies and some limited RCTs suggest that CBT can also be effective in alleviating the distress caused by hyperacusis and misophonia. However, RCTs with active control groups are needed to establish the effectiveness of CBT for hyperacusis and misophonia.