Psychiatry Study Guide

📖 Core Concepts Psychiatry – Medical specialty that diagnoses, treats, and prevents mental conditions (disturbances of cognition, perception, mood, emotion, behavior). Mental Status Examination (MSE) – Systematic assessment of appearance, behavior, thought process, mood, and cognition. Diagnostic Manuals – ICD‑11 (global) and DSM‑5‑TR (U.S.) provide standardized criteria for psychiatric diagnoses. Biopsychosocial Model – Integration of biological, psychological, and social factors in understanding mental illness. Psychotropic Medication – Drugs that modify neurotransmitter activity to relieve psychiatric symptoms; may require therapeutic drug monitoring (e.g., blood counts, serum levels, renal/hepatic function). Psychotherapy – Treatment modalities drawn from humanistic, behavioral, or psychoanalytic traditions; CBT is structured, time‑limited, and targets dysfunctional thoughts/behaviors. Interventional Psychiatry – Procedures such as ECT, TMS, VNS, and ketamine infusion for treatment‑resistant conditions. --- 📌 Must Remember MSE components: Appearance, behavior, speech, mood/affect, thought process, thought content, perception, cognition, insight, judgment. Key diagnostic systems: ICD‑11 (worldwide), DSM‑5‑TR (U.S.). First‑generation antipsychotic: Chlorpromazine (1952). First mood stabilizer: Lithium carbonate (Li₂CO₃) (1948). Major subspecialties: Addiction, child‑adolescent, consultation‑liaison, forensic, geriatric, hospice/palliative, sleep medicine. Ethical code: World Psychiatric Association governs professional conduct; historic controversies include lobotomy and early ECT misuse. Therapeutic drug monitoring: Required for clozapine (WBC), lithium (serum level, renal function), valproate (liver enzymes). --- 🔄 Key Processes Comprehensive Psychiatric Assessment Obtain detailed case history (presenting problem, past psychiatric & medical history, family, psychosocial). Conduct Mental Status Examination. Perform physical exam & labs to rule out medical mimics. Optional: Neuroimaging or cognitive/personality testing when indicated. Differential Diagnosis Workflow Combine MSE findings, labs, imaging → generate differential list. Apply DSM‑5‑TR/ICD‑11 criteria to narrow to primary diagnosis. Treatment Planning Decide inpatient vs. outpatient based on severity/risk. Choose pharmacotherapy (first‑line agent → monitor → adjust). Add psychotherapy (CBT, behavior therapy, etc.) as indicated. Consider interventional options if refractory. Medication Monitoring Cycle Baseline labs → start drug → schedule follow‑up labs (e.g., lithium level 0.6–1.2 mEq/L). Assess efficacy & side‑effects → adjust dose or switch. --- 🔍 Key Comparisons Psychiatrist vs. Psychologist – Psychiatrists: MD, can prescribe meds, order labs/imaging. Psychologists: PhD/PsyD, focus on psychotherapy & testing, no prescribing (except in limited states). Inpatient vs. Outpatient – Inpatient: 1‑2 weeks, 1‑to‑1 supervision, higher risk management. Outpatient: periodic visits, medication management, referrals for psychotherapy. First‑generation vs. Second‑generation Antipsychotics – FGAs: strong dopamine D₂ blockade, high EPS risk. SGAs: broader receptor profile, lower EPS, metabolic side‑effects. CBT vs. Psychoanalysis – CBT: structured, present‑focused, symptom reduction. Psychoanalysis: long‑term, unconscious drive exploration, less evidence for acute symptom relief. --- ⚠️ Common Misunderstandings “Imaging can diagnose mental illness.” – Imaging helps rule out organic causes; it cannot by itself establish a psychiatric diagnosis. “All psychiatrists are psychotherapists.” – Many focus primarily on medication management; psychotherapy may be referred to other professionals. “DSM categories are objective lab results.” – DSM criteria are consensus‑based, relying on symptom clusters, not biomarkers. “ECT is always a first‑line treatment.” – ECT is reserved for severe, treatment‑resistant cases (e.g., catatonia, major depression with suicidality). --- 🧠 Mental Models / Intuition “Biopsychosocial Venn Diagram” – Visualize a patient’s problem as the overlap of biology (neurochemistry), psychology (thoughts/behaviors), and social context (relationships, culture). “Rule‑out, Rule‑in” – First eliminate medical conditions (thyroid, infection) → then apply psychiatric criteria. “Step‑wise escalation” – Start with least invasive (outpatient meds + psychotherapy) → progress to higher‑intensity interventions (ECT, inpatient) only if response is inadequate. --- 🚩 Exceptions & Edge Cases Neuroimaging as a diagnostic aid – May be essential when rapid onset psychosis could be due to encephalitis or tumor. Therapeutic drug monitoring – Not all psychotropics need it; clozapine, lithium, valproate, carbamazepine are exceptions. Telepsychiatry limitations – Effective for most follow‑ups, but initial assessments for severe risk (e.g., active suicidality) may require in‑person evaluation. --- 📍 When to Use Which MSE vs. Structured Interview (SCID) – Use MSE for routine exams; employ SCID when research‑grade diagnostic precision is required. CBT vs. Psychodynamic Therapy – Choose CBT for anxiety, depression, and psychosis with clear maladaptive thoughts; opt for psychodynamic when exploring deep‑seated relational patterns. First‑generation vs. Second‑generation antipsychotic – Use FGAs for acute agitation where rapid dopamine blockade is needed; SGAs for long‑term maintenance with lower EPS risk. Inpatient vs. Outpatient – Admit if patient poses imminent risk to self/others, cannot care for basic needs, or requires intensive monitoring (e.g., ECT). --- 👀 Patterns to Recognize “Somatic symptom + normal labs → consider functional psychiatric disorder.” “Rapid onset (<2 weeks) psychosis + fever → rule out encephalitis.” “Medication non‑response + side‑effect intolerance → consider switching class or adding interventional therapy.” “Broadening DSM criteria → rising prevalence (e.g., autism) – watch for diagnostic inflation.” --- 🗂️ Exam Traps Distractor: “Imaging alone can confirm schizophrenia.” – Wrong; imaging can’t diagnose. Distractor: “All psychiatrists must provide psychotherapy.” – Wrong; many focus solely on medication. Distractor: “DSM‑5 uses biological markers for each disorder.” – Wrong; criteria are symptom‑based. Distractor: “ECT is first‑line for major depressive disorder.” – Wrong; reserved for severe, treatment‑resistant cases. Distractor: “Second‑generation antipsychotics have no metabolic side‑effects.” – Wrong; they carry weight‑gain and diabetes risk. ---