2.1 Comprehensive Psychiatric Interview and Health History

2.1 Comprehensive Psychiatric Interview and Health History

Core Concept: The comprehensive psychiatric interview is the cornerstone of psychiatric assessment. It is the primary diagnostic tool used by the PMHNP to gather data, establish a therapeutic alliance, and formulate a treatment plan.

The Chief Complaint (CC)

The Chief Complaint is the patient's primary reason for seeking care, documented strictly in their own words. It sets the tone for the assessment and ensures the provider understands the patient's immediate concerns. Avoid translating the CC into medical jargon; instead, use quotation marks to preserve the patient's perspective. When the patient cannot provide a coherent chief complaint (acute psychosis, mutism, intoxication, cognitive impairment), obtain collateral from EMS, family, referring providers, or police, and document the source clearly (e.g., Per EMS transfer report: "Patient found wandering in traffic responding to internal stimuli"). For involuntary patients who deny any problem, document the legal reason for evaluation (e.g., Per Baker Act: "Threatening statements to family").

History of Present Illness (HPI)

The HPI is a chronological narrative of the patient's current symptoms. It expands upon the chief complaint, providing a detailed temporal profile of the illness. A robust HPI employs the OLD CARTS framework:

• Onset: When did the symptoms begin? Was it gradual or abrupt?
• Location/Radiation: (More applicable to pain, but for psychiatry, consider the domains affected, e.g., sleep, appetite, energy).
• Duration: How long do the symptoms last? Are they episodic or continuous?
• Character: What is the nature of the symptom? (e.g., "a heavy, sinking feeling" vs. "a tight, anxious knot").
• Aggravating/Alleviating Factors: What makes the symptoms worse or better? (e.g., stress, medications, substance use).
• Timing: Is there a diurnal variation? (e.g., worse in the morning, typical in melancholic depression).
• Severity: How intense are the symptoms? How much do they impair daily functioning? (e.g., missed work days, social withdrawal).

Worked HPI Example

A 38-year-old female presents with three weeks of worsening depressed mood following a job loss. Onset was gradual two days after termination. Symptoms radiate across sleep (initial insomnia, 3 hours/night), appetite (10-lb weight loss in 3 weeks), energy (stays in bed 14 hours/day), and concentration. Aggravated by isolation; temporarily alleviated by visits from her sister. Timing shows classic melancholic diurnal variation (worse upon awakening). Severity is moderate-to-severe: she has missed two scheduled job interviews.

Domain-Specific Screening Within the HPI

To avoid missing diagnostic domains, the PMHNP systematically screens for key symptom clusters:

• Depressive Domain: SIGECAPS (Sleep, Interest, Guilt, Energy, Concentration, Appetite, Psychomotor changes, Suicidality).
• Manic Domain: DIG FAST (Distractibility, Indiscretion, Grandiosity, Flight of ideas, Activity increase, Sleep decrease, Talkativeness).
• Psychotic Domain: Hallucination modality, delusion type, thought disorganization.
• Anxiety/Trauma Domain: Panic episodes, avoidance, intrusion symptoms, hyperarousal.

Past Psychiatric History (PPH)

A meticulous PPH is vital for determining illness trajectory and treatment responsiveness. Key elements to query include:

1. Prior Diagnoses: What have they been diagnosed with in the past? By whom?
2. Hospitalizations: Dates, duration, and reasons for inpatient admissions. This is a crucial indicator of illness severity.
3. Medication Trials: A detailed chronological list of past psychotropics. Crucially, assess:
   • Drug name and maximum dose reached.
   • Duration of the trial (Was it an adequate trial?)
   • Efficacy (Did it help? How much?)
   • Adverse effects (Why was it discontinued?)
4. Psychotherapy: Types of therapy engaged in (e.g., CBT, DBT) and perceived benefit.
5. Suicide Attempts: Number, methods, lethality, and intent of past attempts. Past attempts are the strongest predictor of future risk.

Defining an Adequate Psychotropic Trial

For the ANCC exam, an adequate antidepressant trial requires at least 4-8 weeks at a therapeutic target dose (e.g., Fluoxetine 40-60 mg/day; Sertraline 150-200 mg/day). Differentiate true treatment failure (adequate dose AND duration with minimal response) from intolerance (discontinued due to side effects) and non-adherence (patient stopped). This distinction drives whether the next step is augmentation, switch, or adherence support.

Medical History and Review of Systems (ROS)

Psychiatric symptoms often masquerade as, or are exacerbated by, underlying medical conditions. A comprehensive medical history and ROS are non-negotiable to rule out organic etiologies.

• Medical Conditions: Endocrine disorders (e.g., thyroid dysfunction), neurological disorders (e.g., seizures, traumatic brain injury), and cardiovascular disease.
• Medications: Many non-psychiatric medications can induce psychiatric symptoms (e.g., corticosteroids causing mania/psychosis, beta-blockers causing depression, interferon causing depression, levetiracetam causing irritability/aggression).
• Allergies: Document true allergies versus adverse reactions.
• ROS: A systematic query of all organ systems. Pay particular attention to constitutional symptoms (weight changes, fatigue), neurological symptoms (headaches, focal deficits), and endocrine symptoms (heat/cold intolerance). Specific organic mimics requiring laboratory workup include hypothyroidism (TSH, Free T4), hyperthyroidism, B12 deficiency (serum B12, methylmalonic acid), neurosyphilis (RPR/VDRL, FTA-ABS), Cushing's syndrome (24-hour cortisol), and hepatic encephalopathy (ammonia, LFTs).

Family Psychiatric History

Psychiatric disorders have significant genetic heritability. Bipolar disorder and schizophrenia, for instance, have heritability estimates ranging from 60-80%.

• Focus on first-degree relatives (parents, siblings, children).
• Inquire about diagnoses, hospitalizations, suicides, and substance use disorders within the family.
• Note any family history of response to specific medications, as this can guide treatment selection for the patient.

Social and Developmental History

Understanding the patient's context is essential for a holistic assessment.

• Developmental Milestones: Any delays in childhood?
• Trauma History: Physical, sexual, or emotional abuse (ACEs - Adverse Childhood Experiences profoundly impact lifelong mental health).
• Education and Employment: Highest level of education, current job, work history (frequent job changes may indicate instability).
• Legal History: Arrests, incarcerations, pending charges.
• Substance Use: A detailed history of alcohol, tobacco, illicit drugs, and prescription misuse. Quantify amount, frequency, and last use.
• Support System: Who does the patient rely on? (Family, friends, community).

Informed Consent and Limits of Confidentiality

At the outset, the PMHNP explicitly outlines the evaluation's parameters: name, credentials, and purpose; HIPAA confidentiality and its mandatory exceptions (imminent danger to self [DTS], danger to others [DTO], suspected child/elder/dependent-adult abuse, valid court orders); expected duration (typically 45-60 minutes); and the requirement to use certified professional medical interpreters rather than family members or minor children for limited-English-proficiency or deaf/hard-of-hearing patients.

By meticulously gathering data across these domains, the PMHNP constructs a comprehensive clinical picture, enabling accurate diagnosis and tailored intervention strategies. The interview is not just data collection; it is the foundation of the therapeutic relationship.

Summary of Psychiatric Screening Mnemonics & Clinical Indicators