DSM

Abstract

Since the publication of DSM-IV in 1994, the approach to substance use disorders has faced scrutiny. The strengths noted were mainly around the reliability and validity of dependence; however, concerns have also arisen over various aspects. The DSM-5 Substance-Related Disorders Work Group was established to address these issues and make recommendations for revisions in DSM-5. General concerns included the retention of the division into abuse and dependence, the criteria for substance use disorders, and the identification of an appropriate severity indicator. Specific issues that emerged were the addition of withdrawal syndromes for various substances, the alignment of nicotine criteria with those for other substances, the introduction of biomarkers, and the inclusion of behavioral addictions other than substances.

Introduction

The article summarizes the major issues and evidence reviewed by the work group, utilizing literature reviews and new data analyses extensively. The recommendations for DSM-5 revisions comprised combining abuse and dependence into a single substance use disorder based on findings from over 200,000 participants, dropping the criterion of legal problems, adding craving as a criterion, introducing cannabis and caffeine withdrawal syndromes, aligning the tobacco use criterion with those of other substances, and relocating gambling disorders into the section previously reserved for substances. The proposed changes aim to remedy identified problems while acknowledging that further studies are required on issues with insufficient data.

Overview of DSM Development and Revision

The DSM serves as the standard classification of mental disorders for clinical, research, policy, and reimbursement purposes in the United States and internationally, significantly impacting disorder diagnosis, treatment, and investigation. The DSM has undergone five revisions since its first publication in 1952, with the last version, DSM-IV-TR, published in 1994. The advancement in knowledge regarding psychiatric disorders since then has spurred the need for updating the criteria for substance use disorders to align with current findings.

Formation of the Work Group

In 2007, the American Psychiatric Association (APA) convened the DSM-5 Substance-Related Disorders Work Group, consisting of multidisciplinary experts to evaluate the strengths and weaknesses of the DSM-IV's approach to substance use disorders and suggest improvements for DSM-5. The work group utilized feedback from various sources, including 520 comments from the DSM-5 website and discussions at over 30 professional meetings, to formulate interim recommendations.

Major Issues Addressed by the Work Group

Should Abuse and Dependence Be Kept as Two Separate Disorders?

The DSM-IV criteria divided substance-related disorders into abuse and dependence, with its hierarchy showing dependence above abuse. The latter was diagnosed when at least one abuse criterion was met without dependence. This classification was based on the assumption that the dependence syndrome formed one dimension of substance problems, while the social consequences of heavy use formed another. This hierarchy presented several issues:

  1. Reliability and Validity: Abuse was shown to have lower reliability and validity compared to dependence, raising questions about the criteria's effectiveness.
  2. Diagnosis of Abuse: Nearly half the abuse cases had only one criterion met, primarily hazardous use, which contradicted the diagnostic requirement for multiple symptoms.
  3. Severity of Abuse: Some abuse criteria indicated severe clinical problems, challenging the assumption that abuse is always milder than dependence.
  4. Incorrect Assumptions: Studies challenged common assumptions about the relationship between abuse and dependence, indicating significant overlap and interactions between them, leading to the recommendation of combining the two into a single diagnosis.

Assessment of Criteria through Additional Analyses

Using item response theory analysis and factor analysis, researchers investigated the relationship between abuse and dependence criteria. Results indicated a tendency towards unidimensionality, suggesting the criteria formed one cohesive factor rather than two separate entities. The work group’s analysis encompassed findings from a comprehensive data pool, validating the decision to combine the criteria.

Recommended Changes to DSM-5 Criteria

1. Combine Abuse and Dependence Criteria

The work group resolved to merge these categories into one substance use disorder with unified diagnostic criteria.

2. Criteria Added and Dropped
  • Removed: The criterion regarding legal problems was deemed unnecessary due to low prevalence and poor association with the diagnostic utility in many populations.
  • Added: "Craving" was included based on behavioral, imaging, pharmacological studies indicating the relevance of craving in diagnosis and treatment strategies.
3. Diagnostic Threshold Determination

The selected threshold for substance use disorder diagnosis was set at two or more criteria to ensure more accurate alignments with previous DSM-IV diagnoses while allowing for identification of various severity levels in cases.

4. Severity Representation

The work group determined that severity should be indicated by the count of criteria met (i.e., 2-3 criteria for mild, 4-5 for moderate, and 6+ for severe disorders).

5. Course Specifiers and Physiological Cases

Specific course specifiers were adjusted to simplify diagnostic criteria while maintaining clinical relevance. The criteria for physiological cases were deemed inconsistent and subsequently eliminated.

Specific Considerations for Substance Withdrawal Disorders

Inclusion of Cannabis and Caffeine Withdrawal

  • Cannabis: Emerging evidence resulting from efficacy studies supported the addition of cannabis withdrawal syndrome, demonstrating its reliability and significance in treatment.
  • Caffeine: Studies confirmed the potential diagnosis for caffeine withdrawal following established symptoms that indicated its clinical significance.

Considerations for Other Substances

While there was some support for including withdrawal syndromes for inhalants and ecstasy, evidence was insufficient to warrant inclusion at present.

Addressing Non-Substance Behavioral Addictions

Pathological gambling was separated from impulse control disorders to be included under the substance use disorders chapter due to its comorbidity with substance use disorders. The name was updated to "Gambling Disorder" alongside simplifications to the diagnostic criteria. The possibility of adding non-substance-related behavioral addictions was discussed, though further examination and validation were deemed necessary.

Conclusion and Future Directions

The systematic assessment of all proposed changes for DSM-5 addressed many longstanding issues with smaller, less established disorders. The work group engaged in comprehensive dialogue, gathering external feedback and focusing on data-driven resolutions.
Future research should aim to clarify and refine these concepts, continuing to support the understanding and treatment of substance use disorders and their implications.