Commentary] A META‐ANALYSIS OF BRIEF ALCOHOL INTERVENTIONS IN EMERGENCY DEPARTMENTS: FEW ANSWERS, MANY QUESTIONS
Many published reviews and meta-analyses focus on the efficacy of brief alcohol intervention (BAI) within different settings. For the relevance of BAI on public health, it must be shown where it is effective. Recently, a meta-analysis concluded that in primary care BAI reduced alcohol use by about 30 g per week for at least 12 months [1]. The emergency department (ED) is an ideal setting in which to identify and initiate alcohol abuse interventions [2], therefore it becomes important to address the question of effectiveness in that milieu. In this issue of Addiction, Havard and colleagues [3] obtained somewhat modest results from their meta-analysis of ED research evaluating BAI and its impact on alcohol use and associated outcomes. Eleven studies were included, two of which used pooled data of 1174 hazardous drinkers attending ED and found no differences in drinking quantity or frequency between experimental and control groups. The authors found some efficacy of BAI in reducing alcohol-related injuries, using pooled data of 785 patients across three studies, although tests for heterogeneity indicated that pooled effect sizes of heavy drinking frequency and drinking consequences could not be interpreted meaningfully. These data suggest that it may have been a little premature to conduct a meta-analysis. What can be learned from a more qualitative analysis using the systematic review conducted by the authors and information from published literature? Several factors seem likely to influence BAI efficacy in ED, but only some of these have been evaluated in ED and other settings: the patient: age, sex, severity of alcohol use disorder [4], drinking pattern, such as episodic heavy drinking or chronic use, readiness to change [5], injury severity [6], medical condition and its relation to alcohol use; the counsellor: age, sex, training [7], supervision, relationship style including ability to listen empathically, acquired clinical skills, adherence to BAI structure and style; the intervention: content, such as simple advice or more structured techniques (FRAMES), including or withholding feedback, adopting motivational interviewing style and tools, number of sessions [8] and objective, such as reduction in alcohol use and related problems [9], referral to specialized care [10]; the setting: within ED units, issues such as counselling privacy, maximizing use of time while patients are in waiting rooms, and post-discharge, the interest and support of ED and follow-up staff; and the research methodology: outcome measured, inclusion criteria, interval between baseline and follow-up, duration and content of assessment, dropout rate and type II errors due to lack of statistical power. Considering the influence of the above factors, three hypotheses might be explored in ED settings using BAI: (i) it does; (ii) it does not; or (iii) it sometimes does and sometimes does not reduce alcohol use and related consequences. The hypothesis [1] that any BAI reduces alcohol use and problems is not likely, as it implies that effectiveness does not depend on content, style or duration of intervention when in fact many studies indicate that BAI is effective only under certain conditions, e.g. when the patient's ability to change is maximal [11] or when booster sessions are added to the initial intervention [8]. The hypothesis [2] that BAI does not reduce alcohol use and problems is also unlikely, as several studies of BAI in ED point to greater reductions in alcohol use or problems within experimental groups than in controls [8,9,12]. These results, however, may be tempered by an alternative explanation: that observed differences between the experimental and control groups is not due directly to BAI but occurs because of additional attention given the BAI group, which itself suggests a promising field of research concentrating on reactivity to assessment [13]. Probably the most likely hypothesis [4] is that BAI sometimes does and sometimes does not reduce alcohol use, and that the (sometimes) mixed published results are best explained by the heterogeneity of various BAI factors mentioned above. The hypothesis of differential BAI efficacy within particular settings suggests that BAI, first developed in primary care, might not be effective in ED without some modifications. BAI in ED is generally limited to a single contact between patient and counsellor, preventing the development of the therapeutic alliance in primary care. Moreover, ED can be a hectic milieu, with frequent interruptions that could hinder the empathic listening process and limit the motivation of patients to follow through with formal BAI. It is also important to recognize that the content of BAI has evolved over the last 20 years, from the initial belief that very simple, straightforward advice from health-care providers lacking formal training might be sufficient [14] to more systematic and complex interventions requiring longer training and clinical experience [15]. ‘Few answers, many questions’ and the probable hypothesis that BAI sometimes does and sometimes does not reduce alcohol use and problems suggest that future studies should explore systematically the influence of factors related to the patient, counsellor, intervention, setting and research methodology.
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