Suicidal Ideation

1. History

• Key HPI questions: Ask directly and nonjudgmentally — "Are you having thoughts of killing yourself?" "Have you thought about how you would do it?" "Have you ever attempted suicide?" Less than one-third of patients with suicidal behaviors express their intent to a clinician, making direct inquiry essential. [1]
• Symptom characterization: Distinguish between passive ideation ("I wish I were dead") and active ideation (thoughts of killing oneself, with or without a plan). Assess frequency, duration, intensity, and controllability of thoughts. [2-3]
• Timing, triggers, severity, progression: Identify precipitating events — relationship loss, financial crisis, legal problems, bereavement, recent diagnosis of serious illness, job loss. Determine whether ideation is new, worsening, or chronic. [4]
• Associated symptoms: Hopelessness, helplessness, worthlessness, anhedonia, insomnia, agitation, anxiety, psychotic symptoms (command hallucinations), intoxication. [4-5]
• Important negatives: Absence of a plan, absence of intent, absence of access to lethal means, presence of reasons for living, future-oriented thinking, engagement with social supports.

2. Alarm Features

• Specific plan with access to lethal means (especially firearms)
• Intent to act on suicidal thoughts
• Preparatory behaviors: writing a note, giving away possessions, stockpiling medications, researching methods online [6]
• Recent suicide attempt (especially within past 3 months — highest risk period) [1]
• Command auditory hallucinations directing self-harm
• Acute intoxication with co-occurring suicidal ideation
• Mixed-state bipolar disorder or psychotic depression — significantly increases imminent risk [1]
• Abrupt calmness after a period of agitation (may indicate decision to act)
• Social isolation, withdrawal, and statements about being a burden [4-5]

3. Medications

• Relevant medication contributors:
  • Benzodiazepines are associated with increased suicide risk across multiple psychiatric diagnoses and should be used cautiously, if at all. [7-8]
  • Antidepressants carry an FDA black box warning for increased suicidality in patients <25 years, particularly in the first weeks of treatment and after dose changes — close monitoring is required. [9-10]
  • Anticonvulsants, montelukast, isotretinoin, and corticosteroids have been associated with treatment-emergent suicidal ideation. [11]
• Common treatments:
  • Lithium: Reduces suicide attempts and all-cause mortality in unipolar and bipolar mood disorders. [10][12]
  • Clozapine: Reduces suicidal behavior in schizophrenia-spectrum disorders (restricted due to agranulocytosis risk). [10]
  • SSRIs: First-line for underlying depression/anxiety; reduce suicidal ideation in adults ≥25 years. Prefer SSRIs over TCAs due to lower overdose toxicity. [7][10]
  • Esketamine (Spravato): FDA-approved for MDD with acute suicidal ideation or behavior, in conjunction with an oral antidepressant. Requires REMS-certified healthcare setting with 2-hour post-dose monitoring. [13]
  • Ketamine (IV): Rapidly reduces suicidal ideation within 1–4 hours; emerging evidence for ED use, though effect on suicidal behavior is unproven. [12][14]
• Contraindicated/caution medications:
  • Avoid prescribing large quantities of any medication with overdose potential (especially TCAs, acetaminophen, opioids). Limit to 30-day supplies. [10]
  • Citalopram and venlafaxine carry higher overdose toxicity among antidepressants. [10]

4. Diet

• No specific dietary triggers for suicidal ideation.
• Alcohol and substance use are major disinhibitors and precipitants — acute intoxication dramatically increases risk of acting on suicidal thoughts. [4][15]
• Ensure adequate nutrition and hydration, particularly in patients with severe depression who may have poor oral intake.

5. Review of Systems

• Psychiatric: Depression, anxiety, psychosis, mania/hypomania, substance use, PTSD symptoms
• Sleep: Insomnia or hypersomnia — sleep disturbance is an independent risk factor for suicidal behavior [5]
• Neurologic: Headache, cognitive changes, history of TBI
• Pain: Chronic pain is associated with doubled odds of suicide attempt [15]
• Endocrine: Symptoms of hypothyroidism or other metabolic causes of mood changes
• Social functioning: Withdrawal, loss of interest, inability to work or attend school

6. Collateral History and Family History

• Collateral information is critical — patients may minimize or deny ideation. Speak with family, friends, or caregivers (with patient consent when possible; override confidentiality if safety is at risk). [15]
• Family history of suicide or suicidal behavior is a significant risk factor. [4][16]
• Family history of psychiatric illness, especially mood disorders and substance use disorders.
• Social context: Recent losses, domestic violence, legal issues, housing instability, financial stressors, bullying (in adolescents), LGBTQ+ discrimination. [16]

7. Risk Factors

• Prior suicide attempt — single strongest predictor of future attempt and completed suicide [2][4]
• Psychiatric disorders: Depression (17× increased risk), bipolar disorder, schizophrenia, PTSD, substance use disorders, borderline personality disorder [4-5]
• Access to lethal means, especially firearms [4]
• Male sex (higher completion rate); female sex (higher attempt rate) [5]
• Age: Adolescents/young adults and older adults (especially elderly men)
• Social isolation, living alone, being single/divorced/widowed [5]
• Childhood adversity: Abuse, neglect (4+ ACEs → OR 30.15 for suicide attempt) [15]
• Chronic medical illness: Epilepsy, TBI, chronic pain, ALS, COPD, cancer [2][4]
• Recent discharge from psychiatric hospitalization (highest risk in first weeks) [1]
• Military/veteran status: 21% higher suicide rate than non-veterans [17]
• Unemployment, low socioeconomic status [15-16]

8. Differential Diagnosis

• Major depressive disorder with suicidal ideation (most common underlying diagnosis)
• Bipolar disorder — especially mixed states or depressive episodes
• Substance intoxication or withdrawal (alcohol, stimulants, sedatives)
• Psychotic disorders with command hallucinations
• Borderline personality disorder — chronic suicidality with acute exacerbations
• PTSD with dissociative features
• Adjustment disorder with depressed mood
• Delirium or acute medical illness causing altered mental status (rule out organic causes)
• Medication-induced suicidal ideation (antidepressant initiation, corticosteroids, isotretinoin)
• Non-suicidal self-injury (NSSI) — distinguish from suicidal intent, though NSSI is itself a risk factor

9. Past Medical History

• Previous suicide attempts (number, method, lethality, medical severity)
• Prior psychiatric hospitalizations
• Psychiatric diagnoses and treatment history
• History of self-harm (cutting, burning, overdose)
• Chronic medical conditions (chronic pain, TBI, epilepsy, cancer)
• Substance use history
• Prior response to psychiatric medications
• Surgical history (especially if related to self-harm)

10. Physical Exam

• Vital signs: Tachycardia, hypertension (agitation, intoxication, withdrawal)
• General appearance: Psychomotor agitation or retardation, poor hygiene, weight loss
• Skin: Scars from prior self-harm (wrists, forearms, thighs), signs of recent injury
• Mental status exam (critical component):
  • Mood and affect (flat, tearful, anxious, irritable)
  • Thought content (suicidal ideation, hopelessness, worthlessness, command hallucinations)
  • Thought process (organized vs. disorganized)
  • Judgment and insight
  • Cognition (rule out delirium)
• Toxicologic assessment: Signs of intoxication or withdrawal
• Neurologic exam: Focal deficits suggesting organic etiology

11. Lab Studies

• Urine drug screen — identify substance intoxication or use
• Blood alcohol level
• Basic metabolic panel — electrolyte abnormalities, renal function
• TSH — hypothyroidism can mimic or exacerbate depression
• CBC — if concern for infection or anemia
• Acetaminophen and salicylate levels — if any concern for ingestion
• Pregnancy test — in women of childbearing age (affects management and medication choices)
• Labs are primarily used to rule out medical causes of altered mental status and to evaluate for co-ingestion if overdose is suspected.

12. Imaging

• Not routinely indicated for suicidal ideation without focal neurologic findings or concern for ingestion/trauma.
• CT head: If altered mental status, new neurologic deficits, or history of head trauma.
• Chest/abdominal imaging: If concern for self-inflicted injury or ingestion of foreign body.

13. Special Tests

• Columbia-Suicide Severity Rating Scale (C-SSRS)VA + 2[2-3][18]
• Ask Suicide-Screening Questions (ASQ): 4-question tool validated in pediatric and adult ED populations. [19-20]
• PHQ-9: Item 9 specifically screens for suicidal ideation; any positive response has utility for predicting suicide and suicide attempt. [2][21]
• Safety Planning Intervention (SPI): A structured 6-step cognitive-behavioral intervention — not a test, but a critical ED-based intervention that reduces suicidal behavior when combined with follow-up contact. [9][17]

The ACEP recommends that risk-assessment tools should not be used in isolation to identify low-risk patients safe for discharge; clinical judgment incorporating patient, family, and community factors remains essential. [22]

14. ECG

• Obtain ECG if:
  • Suspected overdose (especially TCAs — look for QRS widening, QTc prolongation)
  • Lithium toxicity (bradycardia, T-wave changes, conduction abnormalities)
  • Ingestion of QT-prolonging agents
• Dangerous patterns: Wide QRS (>100 ms) with TCA overdose, Brugada pattern, torsades de pointes

15. Assessment

• Suicidal ideation exists on a spectrum from passive ("I wish I weren't alive") to active with a specific, lethal plan and intent. Risk assessment should integrate ideation characteristics, risk factors, protective factors, and clinical judgment. [4][22]
• Approximately 87% of suicide decedents meet criteria for one or more psychiatric disorders, most commonly depression. [16]
• The transition from ideation to attempt is influenced by comorbid anxiety, psychological pain, substance use, impulsivity, and access to means. [15][23]
• Atypical presentations: Patients may present with somatic complaints, agitation, or behavioral changes without disclosing suicidal thoughts. Elderly patients and men are particularly likely to underreport. [1]
• Complications: Completed suicide, self-inflicted injury, medical complications of attempts (organ damage from overdose, anoxic brain injury from hanging/asphyxiation).

16. Treatment Plan

Initial stabilization:

• Ensure a safe environment: Remove sharps, cords, medications, and other potential means. One-to-one observation for high-risk patients. [2]
• Treat acute intoxication or medical emergencies first.

ED-based interventions:

• Safety Planning Intervention (SPI): Collaboratively develop a personalized 6-step safety plan (warning signs → coping strategies → social contacts → professional resources → means restriction → reasons for living). SPI combined with follow-up contact reduced suicidal behavior by ~50% compared to usual care in a large VA study. [17]
• Lethal means counseling: Counsel on restricting access to firearms, medications, and other lethal means. Only 40% of suicidal ED patients have documentation of means counseling. [24]
• No-suicide contracts are NOT recommended — they lack evidence of efficacy and may be counterproductive. [9-10]

Pharmacotherapy:

• Lithium for bipolar or unipolar mood disorders with suicidality. [10][12]
• SSRIs for underlying depression/anxiety — start low, monitor closely in patients <25 years. [9-10]
• Esketamine (intranasal) for MDD with acute suicidal ideation, administered in a certified setting. [13]
• Clozapine for schizophrenia-spectrum disorders with suicidality. [10]
• Combination of psychotherapy + pharmacotherapy is more effective than either alone. [10]

Psychotherapy (outpatient):

• CBT reduces suicide attempts and ideation compared to treatment as usual. [12]
• DBT is effective for borderline personality disorder with chronic suicidality. [12]

17. Disposition

Admission criteria:

• Specific plan with intent and access to means [10]
• Recent serious suicide attempt
• Psychosis with command hallucinations
• Inability to contract for safety (note: this is clinical judgment, not a "no-suicide contract")
• Lack of social support or safe discharge environment
• Active substance intoxication with suicidal ideation until sober reassessment
• When in doubt, inpatient care is the prudent option [10]

Discharge criteria:

• Denies current suicidal intent, no plan, no access to means [10]
• Good social support and safe home environment
• Able to engage in safety planning
• Willing to follow up with outpatient mental health
• Lethal means restriction has been addressed

Observation indications:

• Intoxicated patients with suicidal ideation — reassess when sober
• Ambiguous risk level requiring extended evaluation
• Awaiting psychiatric consultation

Specialist consultation triggers:

• Psychiatry consultation for all moderate-to-high risk patients
• Social work for means restriction counseling, safety planning, and resource coordination
• Consider involuntary hospitalization if patient refuses treatment and is at imminent risk — review state-specific legislation [9-10]

18. Follow Up / Return Precautions

• Follow-up timing: Within 24–72 hours of ED discharge for high-risk patients. Post-discharge follow-up phone calls reduce subsequent suicidal behavior. [9][17]
• 988 Suicide and Crisis Lifeline (call or text 988): Provide to all patients at discharge. [9]
• Crisis Text Line: Text HOME to 741741.
• Symptoms requiring immediate reassessment:
  • Return of suicidal thoughts, especially with a plan
  • Worsening hopelessness or agitation
  • Access to lethal means not yet restricted
  • New substance use or intoxication
  • Medication side effects (especially activation/agitation with new antidepressant)
• Patient and family counseling:
  • Suicidal ideation is often self-limited in duration — brief, high-intensity interventions during crisis can be lifesaving. [9]
  • Remove firearms, lock up medications, and limit access to other lethal means. [4][9]
  • Engage family/friends as safety monitors.
• Expected recovery course: With appropriate treatment (psychotherapy, pharmacotherapy, safety planning), most patients experience significant reduction in suicidal ideation. Risk is highest in the first 6 months following a suicidal crisis. [17]

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