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BRIEF RESEARCH REPORT article

Front. Psychiatry, 06 March 2023
Sec. Addictive Disorders
This article is part of the Research Topic Addiction and the Brain: Current Knowledge, Methods, and Perspectives View all 14 articles

Drinking alcohol to cope with hyperactive ADHD? Self-reports vs. continuous performance test in patients with ADHD and/or alcohol use disorder

\r\nMathias Luderer*Mathias Luderer1*Johanna SeidtJohanna Seidt2Sarah GerhardtSarah Gerhardt3Sabine Hoffmann,Sabine Hoffmann3,4Sabine Vollstdt-KleinSabine Vollstädt-Klein3Andreas ReifAndreas Reif1Esther Sobanski,,Esther Sobanski2,5,6
  • 1Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital, Goethe University Frankfurt, Frankfurt, Germany
  • 2Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
  • 3Department of Addictive Behavior and Addiction Medicine, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
  • 4Department of Biostatistics, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
  • 5Department of Child and Adolescent Psychiatry and Psychotherapy, Lucerne Cantonal Hospital, Lucerne, Switzerland
  • 6Department of Child and Adolescent Psychiatry and Psychotherapy, University Medical Center Mainz, Mainz, Germany

Rationale: Attention deficit/hyperactivity disorder (ADHD) is common in alcohol use disorder (AUD). Continuous performance tests (CPTs) allow to measure ADHD related deficits in a laboratory setting. Most studies on this topic focused on CPTs measuring inattention or impulsivity, disregarding hyperactivity as one of the core symptoms of ADHD.

Methods: We examined N = 47 in three groups (ADHD N = 19; AUD N = 16; ADHD + AUD N = 12) with questionnaires on ADHD core symptoms, executive functioning (EF), mind wandering, and quality of life (QoL). N = 46 (ADHD N = 16; AUD N = 16; ADHD + AUD N = 14) were examined with a CPT (QbTest®) that also measures motor activity objectively.

Results: Inattention and impulsivity were significantly increased in AUD vs. ADHD and in AUD vs. ADHD + AUD. Hyperactivity was significantly higher in ADHD + AUD vs. ADHD and ADHD + AUD vs. AUD, but not in ADHD vs. AUD. EF was lower in both ADHD groups vs. AUD. Mind wandering was increased in both ADHD groups vs. AUD. QoL was significantly lower in ADHD + AUD compared to AUD. In contrast, results of the QbTest were not significantly different between groups.

Conclusion: Questionnaires are more useful in assessing ADHD core symptoms than the QbTest®. Hyperactivity appears to be a relevant symptom in ADHD + AUD, suggesting a possible pathway from ADHD to AUD. The lower QoL in ADHD + AUD emphasizes the need for routine screening, diagnostic procedures and treatment strategies for this patient group.

1. Introduction

Attention deficit/hyperactivity disorder (ADHD) has a prevalence rate of 7.1% in children and adolescents (1) and leads to ongoing symptoms and impairment at least until young adulthood in about 90% of cases (2). Adolescents with ADHD are at increased risk for early initiation and quick escalation of substance use (35).

In adults with alcohol use disorder (AUD), comorbid ADHD is common with prevalence rates between 16 and 21% (57). However, ADHD is often under-diagnosed in AUD despite its negative effect on adherence and outcome (5).

International expert consensus recommends routine screening for ADHD in patients with substance use disorders (SUDs) (8), although ADHD screening questionnaires show decreased validity in AUD (9). In any case, additional diagnostic assessment is needed to verify ADHD diagnosis, while so far only one diagnostic interview for ADHD has been validated in AUD (5).

The high prevalence of ADHD in AUD (57) and low detection rate (5) affect the outcome for the individual patient but also the results of basic human and clinical research. AUD studies most likely included an uncertain number of undetected ADHD cases (10).

Sensitive methods objectively measuring ADHD symptoms could therefore aid in clinical and scientific settings.

Continuous performance tests (CPTs) to measure ADHD symptoms have not been studied extensively in the comorbidity of SUD with ADHD (11), but hyperactivity has been suggested as a relevant parameter for ADHD in SUD (12).

Our study aimed to investigate whether objective measurements or self-rating scales on inattention, impulsivity, and hyperactivity would show differences between patients with ADHD, AUD, and ADHD + AUD.

2. Materials and methods

Participants were 18–64 years old and patients in treatment at the Central Institute of Mental Health (Mannheim, Germany).

2.1. Inclusion criteria

Alcohol use disorder was diagnosed by trained masters- or medical-degreed personnel according to ICD-10 alcohol dependence (13); participants had to be abstinent for at least 5 days prior to study inclusion (completed detoxification).

Attention deficit/hyperactivity disorder was diagnosed by trained masters- or medical-degreed personnel according to clinical guidelines (14), based on DSM-5 criteria for adult ADHD (15). If available, structured interviews, school records and informants’ ratings were used for the diagnostic assessment.

2.2. Exclusion criteria

For the groups AUD or ADHD, individuals with a diagnosis of a mental disorder within the last year or intake of psychotropic medication within the last 3 days were excluded. Stable medication with fluoxetine was considered acceptable in one participant in the ADHD group (self-reports only). Participants in the ADHD group were allowed to take prescribed stimulants, but not the day when the QbTest was conducted.

Psychiatric comorbidity did not lead to an exclusion for the ADHD + AUD group, as psychiatric comorbidity in individuals with ADHD and SUD is remarkably high (10, 1618).

2.2.1. AUD group

Participants in the AUD group had to screen negative for ADHD in three different questionnaires: Wender Utah Rating Scale (19), ADHD self-report scale (20), Adult ADHD Self-Report Scale (21).

2.2.2. ADHD group

Participants in the ADHD group had to screen negative (cut-off <8) for AUD in the Alcohol Use Disorder Identification Test (22).

2.2.3. Exclusion criteria for all groups

• Cocaine/amphetamine/opioid dependence lifetime

• Lifetime diagnosis of delusional disorders, schizophrenia, or bipolar disorder

• Severe physical illness

The Ethics Committee of the Medical Faculty Mannheim, Heidelberg University, Germany approved the study beforehand (approval number 2013-530 N-MA). All participants provided written informed consent and the study was in accordance with the Declaration of Helsinki.

2.3. QbTest®

This commercially available CPT comprises of a 1-back task while measuring head movements with an infrared camera and a reflector attached to a headband. The QbTest® provides raw scores for motor activity, inattention and impulsivity. From these raw scores, the cardinal parameters Qb-activity, Qb-inattention, and Qb-impulsivity are derived by performing a principal component analysis. These parameters are transformed into normally distributed Q-scores implicating information about the difference between the individual raw score compared to scores of a gender- and age-controlled group (23).

2.4. Self-report scales

2.4.1. ADHD Self-Rating Scale

ADHD Self-Rating Scale (ADHD-SR) consists of 18 items (DSM criteria for ADHD). A total score as well as sub-scores on hyperactivity, impulsivity, and inattention can be calculated (20, 24).

2.4.2. Barratt Impulsivity Scale

The 30 items of the Barratt Impulsivity Scale (BIS-11) assess trait impulsivity [attentional (e.g., distraction), motor, and non-planning] (25).

2.4.3. Quality of Life Enjoyment and Satisfaction Questionnaire

The 16 items of the Quality of Life Enjoyment and Satisfaction Questionnaire (Q-LES-Q) measure quality of life (QoL) as the degree of enjoyment and satisfaction experienced in various areas of daily functioning (26).

2.4.4. Behavior Rating Inventory of Executive Function – Adult Version

Executive functioning (EF) summarizes a set of advanced cognitive abilities that allow cognitive, emotional, and motor control to create goals, create plans to achieve the goals and stick to the plan until the goals are achieved. Higher scores in the 75 items Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) mean more EF deficits (27).

2.4.5. Mind Excessively Wandering Scale

Unintentional mind wandering is common in ADHD and higher frequency of mind wandering is associated with increased functional impairment and related to lower EF (28). The Mind Excessively Wandering Scale (MEWS) consists of 15 items (29, 30).

2.5. Statistical analysis

Data were analyzed with IBM SPSS Statistics for Windows, Version 27.0. The distribution of gender was compared using Fisher’s exact test. An analysis of variance (ANOVA) was calculated to compare the mean age between groups. Since cardinal Qb-parameters were already controlled for sex and age, we applied an ANOVA, using Bonferroni correction for multiple testing. A one-way analysis of covariance (ANCOVA) was conducted on the questionnaire scores controlling for age and gender, using a Bonferroni correction for multiple testing. A p-value < 0.05 was used as significance level for all calculations.

3. Results

Complete data on the self-report scales were available for N = 47 participants (ADHD N = 19; AUD N = 16; ADHD + AUD N = 12) and were included in this analysis. For the QbTest®, we included N = 46 (ADHD N = 16; AUD N = 16; ADHD + AUD N = 14).

Age and gender were significantly different between groups, see Table 1.

TABLE 1
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Table 1. Basic characteristics.

3.1. QbTest®

One-way ANOVA with Bonferroni post-hoc correction showed no statistically significant differences between groups for all QbTest results (see Table 2 and Figure 1B).

TABLE 2
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Table 2. QbTest.

FIGURE 1
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Figure 1. (A) Estimated marginal means of ADHD-SR hyperactivity. (B) Means of Qb activity.

3.2. Questionnaires

One-way analysis of covariance with Bonferroni post-hoc correction showed statistically significant differences between groups: inattention, impulsivity (both measured with BIS-11 and ADHD-SR), mind wandering, and EF were significantly different in ADHD vs. AUD and in ADHD + AUD vs. AUD, but not in ADHD + AUD vs. ADHD.

In contrast, hyperactivity was significantly increased in ADHD + AUD vs. ADHD, and in ADHD + AUD vs. AUD (Figure 1A), while the numerical difference in ADHD vs. AUD did not reach significance. QoL was significantly lower in ADHD + AUD vs. AUD, but no further statistically significant group differences emerged (Table 3).

TABLE 3
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Table 3. Self-report scales.

4. Discussion

To our knowledge, this is the first study directly comparing individuals with AUD and/or ADHD objectively measuring hyperactivity and other core ADHD symptoms (inattention, impulsivity).

ADHD + AUD showed increased hyperactivity in self-reports. Other ADHD related deficits also showed differences for ADHD groups (ADHD + AUD or ADHD) vs. AUD. However, we found no group differences for the QbTest parameters.

Substance use disorder and ADHD show comparable inattentive and impulsive behavior in CPTs, but hyperactivity was identified as a promising parameter to distinguish ADHD from SUD (11). One study used certain measures of motor impulsivity (e.g., pressing buttons too quickly or randomly) as a proxy for hyperactivity, and found a significant difference between ADHD (with or without SUD) and SUD, although the effect size was small (31).

Attention deficit/hyperactivity disorder and healthy controls significantly differ in all ADHD core symptoms as measured by the QbTest® (32). Although sensitivity and specificity for the QbTest® were decreased in clinical samples, most studies still found differences on a group level (3336), especially regarding hyperactivity (36). Thus, ADHD remains a clinical diagnosis (14).

This contrasts with the results of our study. Here, the QbTest® did not show any differences between groups regarding objectively measured ADHD core symptoms.

In ADHD, new and interesting situations with low distraction – as in (laboratory) research – often lead to a temporary decrease in symptoms including hyperactivity (37). Functional imaging studies on AUD and ADHD showed similar impulsivity and resting state brain networks (38), but brain activation during inhibition tasks depended on ADHD and AUD severity (39). These findings, together with our results, suggest that in ADHD a less effective brain network compensates impulsivity, which might be more vulnerable to distractors or a general increased level of stress in real life (40), but not in a controlled laboratory setting. This might also apply to other ADHD symptoms.

Larger samples might be needed to detect group differences in ADHD related deficits (11, 31) due to a large overlap of affected domains in ADHD and AUD (41). However, larger samples often lead to more heterogeneous groups (31). This might affect study results, as for example heavy cannabis use has been associated with more ADHD related deficits during a CPT (42). In our study, we investigated a more homogenous sample (e.g., exclusion of other SUDs).

Of note, self-report questionnaires already showed significant and group specific differences at the given sample size.

Hyperactivity decreases during adolescence (43). In adults, a feeling of inner restlessness can be the main hyperactive symptom (44) and thus can only be assessed by self-report. However, persisting hyperactivity has been associated with severe comorbidity such as SUD (45). This is confirmed by our study, as ADHD + AUD reported higher hyperactivity than AUD or ADHD alone. Adolescents with ADHD and comparably high hyperactivity might be more prone to drink alcohol to cope with their hyperactivity and develop an AUD subsequently. ADHD did not differ from AUD regarding self-reported hyperactivity, implicating that increased hyperactivity is a possible pathway from childhood ADHD to development of AUD later in adolescence or early adulthood, probably to reduce unpleasant hyperactivity or restlessness (46). As we did not assess comorbidity, hyperactivity could also be driven by co-occurring mental health problems such as emotional dysregulation (10), traumatic experiences (17, 47) or trauma-related disorders (16, 17).

Our results show that individuals with ADHD (with or without AUD) are more impulsive than individuals with AUD only. Decades of research have linked AUD to increased impulsivity (48). Impulsivity is either increased in AUD (but even more in ADHD + AUD) or only increased in AUD + ADHD. Supporting the latter, impulsivity is mainly increased in individuals with “early onset” AUD (49). Since the age of onset of AUD is almost 10 years earlier in patients with ADHD (5), many ADHD cases might be hidden in the term “early onset” AUD.

Although impulsivity and alcohol consumption in adolescence negatively affect each other leading to early AUD (10, 50, 51), we did not find differences in impulsivity between ADHD and ADHD + AUD. This is probably due to a ceiling effect, as the impulsivity scores in both ADHD groups corresponded to the scores of in-patients in a forensic setting (52).

Attention deficit/hyperactivity disorder or ADHD + AUD had more deficits in EF compared to AUD, which is in line with recent findings (53). EF deficits are associated with an increased risk for treatment drop-out in AUD (54) and SUD + ADHD (55) and lower QoL in ADHD (56).

Mind wandering (MW) was increased in ADHD (with or without AUD) compared to AUD. MW is associated with lower EF, lower QoL and more severe ADHD (28, 57), and an increased risk for traffic accidents (58, 59). Alcohol consumption increases MW but decreases individual awareness for MW (28). Since individuals with ADHD are at increased risk for traffic accidents, especially with co-occurring substance use (40), reducing MW might be relevant especially in ADHD + AUD.

Attention deficit/hyperactivity disorder or AUD is associated with low QoL (60, 61) but successful treatment improves QoL (62, 63). In our study, ADHD + AUD had lower QoL vs. AUD, while ADHD did not differ from AUD. We conclude that co-occurrence of AUD and ADHD has a significant impact on QoL in AUD. QoL is an important outcome parameter in AUD (64) and studies on interventions in ADHD + AUD might also address improvement of QoL.

5. Conclusion

In conclusion, self-report scales on core symptoms of ADHD as well as on ADHD related deficits showed significant and specific group differences between ADHD, AUD, and ADHD + AUD, while a CPT did not show any differences between groups.

Hyperactivity was confirmed to be a relevant symptom in ADHD + AUD, suggesting a possible pathway from ADHD to AUD. The lower QoL in ADHD + AUD compared to AUD emphasizes the need for routine ADHD screening, diagnostic procedures and treatment strategies in patients with AUD.

Data availability statement

The datasets presented in this article are not readily available because the data contain information that would compromise research participant consent. We will provide data upon direct request by research colleagues following current data protection guidelines. Requests to access the datasets should be directed to ML, mathias.luderer@kgu.de.

Ethics statement

The studies involving human participants were reviewed and approved by the Ethics Committee of the Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany. The patients/participants provided their written informed consent to participate in this study.

Author contributions

ML and ES designed the study. ML, JS, and SG collected the sample. ML performed the literature review, conducted the analyses together with JS, and wrote the initial version of this manuscript. All authors contributed to the article and approved the submitted version.

Acknowledgments

We thank Georg Sharafi, Rahila Nuriyeva, Stefanie Lis, Oliver Hennig, Barbara Alm, Derik Hermann, and Wolfgang Sommer for their assistance in recruitment, diagnostics, and data collection. Further, we also thank SH for her assistance in data management.

Conflict of interest

ML has received honoraria as a speaker and/or for participation in advisory boards from Medice, Shire/Takeda, and Recordati. ES has received honoraria for participation in advisory board from Takeda. AR has received a research grant from Medice and served on advisory boards and/or speaker’s bureau for Medice, Shire/Takeda, Janssen, Servier, and Neuraxpharm.

The remaining 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.

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Keywords: attention deficit/hyperactivity disorder (ADHD), alcohol use disorder (AUD), quality of life, continuous performance test, motor activity (MA), mind wandering

Citation: Luderer M, Seidt J, Gerhardt S, Hoffmann S, Vollstädt-Klein S, Reif A and Sobanski E (2023) Drinking alcohol to cope with hyperactive ADHD? Self-reports vs. continuous performance test in patients with ADHD and/or alcohol use disorder. Front. Psychiatry 14:1112843. doi: 10.3389/fpsyt.2023.1112843

Received: 30 November 2022; Accepted: 14 February 2023;
Published: 06 March 2023.

Edited by:

Johannes Petzold, University Hospital Carl Gustav Carus, Germany

Reviewed by:

Francesca Fusina, University of Padua, Italy
Michael Widder-Koenig, Paracelsus Medizinische Privatuniversität, Germany

Copyright © 2023 Luderer, Seidt, Gerhardt, Hoffmann, Vollstädt-Klein, Reif and Sobanski. 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: Mathias Luderer, mathias.luderer@kgu.de

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