2.8 Substance Use Disorders & Safety-Risk Assessment
Key Takeaways
- DSM-5-TR substance use disorder severity is based on the number of 11 criteria met: mild (2-3), moderate (4-5), severe (6 or more).
- Alcohol withdrawal can progress to delirium tremens (DTs), a medical emergency typically appearing 48-96 hours after the last drink; the CIWA-Ar scale guides benzodiazepine-based treatment.
- The C-SSRS distinguishes suicidal ideation from a plan, intent, and means, which is the critical distinction for determining the level of safety precautions required.
- The SAD PERSONS scale is a structured mnemonic tool for stratifying suicide risk across factors including sex, age, depression, prior attempts, and access to lethal means.
- The PHQ-9 (depression) and GAD-7 (anxiety) are standardized screening tools; PHQ-9 item 9 specifically screens for suicidal ideation and must never be skipped.
This final section of Domain I covers two of the highest patient-safety topics on the PMH-BC exam: substance withdrawal syndromes and structured suicide/violence risk assessment, both of which reward exact recall of numbers and timelines.
Substance Use Disorder Severity
DSM-5-TR diagnoses a substance use disorder using a shared list of 11 criteria spanning impaired control, social impairment, risky use, and pharmacological criteria (tolerance, withdrawal). Severity is based on the count of criteria met within a 12-month period: mild = 2-3 criteria, moderate = 4-5 criteria, severe = 6 or more criteria.
Alcohol Withdrawal
Alcohol withdrawal follows a predictable, dangerous timeline. Early symptoms (tremor, anxiety, diaphoresis, nausea, tachycardia) typically begin 6-24 hours after the last drink. Withdrawal seizures may occur in the 12-48 hour window. Delirium tremens (DTs) — a true medical emergency marked by severe autonomic instability, profound confusion, hallucinations, and agitation — most commonly appears 48-96 hours after the last drink and carries a meaningful mortality risk if untreated. The CIWA-Ar (Clinical Institute Withdrawal Assessment for Alcohol, Revised) scale is used to quantify withdrawal severity at the bedside and guide benzodiazepine-based symptom-triggered dosing, the mainstay of safe alcohol withdrawal management.
Opioid, Stimulant, and Benzodiazepine Withdrawal
Opioid withdrawal, assessed with the COWS (Clinical Opiate Withdrawal Scale), produces flu-like symptoms (myalgia, rhinorrhea, piloerection, GI distress, dilated pupils) but is not typically life-threatening in an otherwise healthy adult; treatment includes methadone, buprenorphine, and clonidine for autonomic symptoms. Stimulant withdrawal (cocaine, amphetamines) after intoxication produces a "crash" of dysphoria, fatigue, increased appetite, and vivid unpleasant dreams — distressing but not typically dangerous. Benzodiazepine withdrawal, by contrast, mirrors alcohol withdrawal and can be life-threatening, including seizure risk, so long-term benzodiazepine use must be tapered gradually, never stopped abruptly.
Suicide Risk Assessment
Every psychiatric assessment must include explicit suicide risk screening, and the exam expects precision in separating three distinct concepts: ideation (thoughts of suicide, passive or active), plan (a specific method identified), and intent (the degree to which the person intends to act on the plan) — plus access to lethal means. The presence of a specific plan combined with access to means and stated intent represents the highest-acuity presentation requiring immediate safety intervention.
The Columbia-Suicide Severity Rating Scale (C-SSRS) is the standardized instrument most widely used to operationalize this distinction, walking the clinician through a hierarchy from wish to be dead, through passive and active ideation, to ideation with method, intent, and plan — and also captures suicidal behavior/preparatory acts. The SAD PERSONS scale is a mnemonic risk-stratification tool that assigns one point for each of 10 risk factors present, with the total score guiding disposition:
| Letter | Risk Factor | Clinical Note |
|---|---|---|
| S | Sex | Male = higher completed-suicide risk |
| A | Age | Younger than 19 or older than 45 = higher risk |
| D | Depression | Current depressive disorder present |
| P | Previous attempt | Prior suicide attempt in the history |
| E | Ethanol abuse | Active alcohol misuse |
| R | Rational thinking loss | Psychosis or delirium impairing judgment |
| S | Social supports lacking | Limited or absent support system |
| O | Organized plan | A specific, feasible method identified |
| N | No spouse | Divorced, widowed, separated, or never married |
| S | Sickness | Chronic, debilitating, or terminal illness |
A higher total score indicates greater risk and informs the level of precaution (e.g., 1:1 observation, unit level, hospitalization) — though no scale replaces clinical judgment, and any positive C-SSRS finding of plan or intent warrants immediate escalation regardless of the numeric score.
Violence and Homicide Risk
Violence risk assessment follows a parallel logic: the single best predictor of future violence is a history of past violence. Additional risk factors include weapon access, an identified target, active psychosis with command hallucinations or persecutory delusions, substance intoxication, and poor impulse control. When a patient names a specific, identifiable victim, duty-to-warn/duty-to-protect obligations may apply — covered in Section 6.3.
Safety Planning and Means Restriction
Once risk is identified, structured safety planning is a core nursing intervention. A collaborative safety plan includes recognizing personal warning signs, internal coping strategies, distracting people and settings, people who can be asked for help, crisis resources (including the 988 Suicide & Crisis Lifeline), and — critically — means restriction: limiting the patient's access to firearms, stockpiled medications, and other lethal means during a period of elevated risk. Means restriction counseling has strong evidence for reducing completed suicide, since many suicidal crises are time-limited and reducing access to lethal means during that window saves lives.
Beyond the crisis-focused scales above, general symptom-severity tools are used routinely: the PHQ-9 (Patient Health Questionnaire-9) screens depression severity, with scores of 10 or higher suggesting moderate depression; critically, item 9 screens for thoughts of self-harm or suicide and must never be skipped, even when the total score is low. The GAD-7 screens anxiety severity, with a score of 10 or higher suggesting moderate anxiety. The CAGE (Cut down, Annoyed, Guilty, Eye-opener) and AUDIT are brief validated screens for problematic alcohol use, identifying patients who need the fuller substance-use assessment described above.
A patient's last alcoholic drink was 72 hours ago. The patient is now severely confused, diaphoretic, tachycardic, and reporting visual hallucinations. Which condition should the nurse suspect?
On the PHQ-9, which item requires the nurse's specific attention regardless of the patient's total score?