Mental disorder Study Guide

📖 Core Concepts Mental Disorder – A clinically significant disturbance in cognition, emotion regulation, or behavior that causes distress or functional impairment. DSM‑5‑TR vs ICD‑11 – DSM provides detailed diagnostic criteria (U.S.‑focused); ICD‑11 classifies disorders in Chapter 6 for global use. Categorical Model – Disorders are distinct categories defined by symptom thresholds. Dimensional Model – Psychopathology is viewed on continua (e.g., internalizing vs. externalizing); includes the p‑factor (general psychopathology) and the Hierarchical Taxonomy of Psychopathology (HiTOP). Biopsychosocial/Diathetic‑Stress Model – Interaction of biological vulnerability + environmental stress → disorder onset. Two‑Continua Model – Mental health and mental illness are separate dimensions; one can have high well‑being and a diagnosed disorder. --- 📌 Must Remember Prevalence: > 1/3 of people worldwide meet criteria for a mental disorder at some point; 46 % in the U.S. lifetime prevalence. Highest‑Yield Disorders: Anxiety (≈ 16.6 % lifetime), Major Depression (≈ 6.7 %), Schizophrenia (≈ 0.4 %). Typical Onset Ages Anxiety & impulse‑control: childhood Mood disorders: adolescence (30 y for depression) Schizophrenia: late teens‑early 20s Risk Factors – Family history, high neuroticism, childhood trauma, prenatal stress, substance use (cannabis, amphetamines), chronic physical illness. Diagnostic Process – Mental status exam + history + rule‑out medical causes + structured interview (e.g., SCID). Core Treatments – Psychotherapy (CBT, DBT, IPT, family therapy) + psychiatric medication (antidepressants, anxiolytics, mood stabilizers, antipsychotics, stimulants). Key Legal Principles – Involuntary treatment only when the person lacks decision‑making capacity and poses imminent danger; rights require independent review and possibility of advance directives. --- 🔄 Key Processes Diagnostic Evaluation Take comprehensive history (symptoms, onset, course, family, substance use). Conduct Mental Status Exam (appearance, behavior, thought, perception, cognition). Use structured interview to match DSM‑5‑TR criteria. Perform physical exam & labs to exclude medical mimics. Consider comorbidities; assign primary vs secondary diagnoses. Biopsychosocial Treatment Planning Identify primary disorder(s) and severity. Choose evidence‑based psychotherapy (CBT for anxiety/depression, DBT for BPD, IPT for depression). Select pharmacotherapy class based on diagnosis (e.g., SSRI → depression/anxiety, mood stabilizer → bipolar). Add lifestyle interventions (exercise, diet, sleep hygiene). Re‑evaluate response every 4–6 weeks; adjust plan. Risk‑Assessment for Violence Screen for substance use, past violent behavior, psychotic symptoms. Assess contextual factors (young age, male, low SES). Document findings; consider safety planning or involuntary admission only if imminent danger. --- 🔍 Key Comparisons DSM‑5‑TR vs ICD‑11 DSM: symptom‑checklist, U.S.‑centric, categorical focus. ICD‑11: Chapter 6, incorporates dimensional severity for personality disorders. Categorical vs Dimensional Models Categorical: “You have/not have” a disorder; clear treatment pathways. Dimensional: Scores on continua; captures sub‑threshold symptoms, explains comorbidity. Anxiety vs Obsessive‑Compulsive Disorder Historically anxiety; now separate because OCD’s obsessions/compulsions are distinct phenomenologically. Antidepressants vs Anxiolytics Antidepressants (e.g., SSRIs) treat depression and many anxiety disorders; require weeks for effect. Anxiolytics (e.g., benzodiazepines) provide rapid relief of acute anxiety but risk dependence. --- ⚠️ Common Misunderstandings “All mental illness equals violence.” – Only 4 % of overall violence is linked to mental illness; most patients are non‑violent. “DSM diagnoses are objective laboratory tests.” – Diagnoses rely on clinical judgment; no biomarker meets the 80 % sensitivity/specificity threshold yet. “Personality disorders are untreatable.” – Evidence‑based psychotherapies (DBT, mentalization‑based therapy) improve outcomes. “Medication cures the disorder.” – Pharmacotherapy reduces symptoms; most disorders benefit from combined psychosocial interventions. --- 🧠 Mental Models / Intuition “Stress + Vulnerability = Disorder” – Picture a glass (vulnerability) being filled with water (stress); overflow = symptom emergence. “Continuum Lens” – Imagine mental health as a gradient from flourishing to distress; disorders are points where distress exceeds functional thresholds. “Dimensional Stack” – Visualize internalizing (anxiety, depression) and externalizing (ADHD, conduct) towers; comorbid patients have height in both towers, explaining overlapping symptoms. --- 🚩 Exceptions & Edge Cases Schizoaffective Disorder – Features both psychosis and mood episodes; must have ≥ 2 weeks of psychotic symptoms without mood symptoms. Personality Disorder Severity (ICD‑11) – Uses dimensional severity (mild, moderate, severe) rather than strict categories. Substance‑Induced vs Primary Psychosis – Cannabis‑induced psychosis may remit with abstinence; primary schizophrenia persists. --- 📍 When to Use Which CBT vs DBT – Use CBT for primary anxiety/depression; DBT when emotion‑regulation dyscontrol (e.g., borderline personality) dominates. SSRIs vs Benzodiazepines – Start SSRI for chronic anxiety/depression; reserve benzodiazepine for short‑term crisis or severe insomnia. Structured Interview vs Unstructured – Structured (SCID) for research or complex comorbidity; unstructured may suffice for straightforward cases but carries higher error risk. Dimensional Rating (HiTOP) vs Categorical DSM – Dimensional approach when assessing sub‑threshold symptoms or high comorbidity; categorical when insurance billing or treatment guidelines require a specific diagnosis. --- 👀 Patterns to Recognize Early‑Onset + Family History → High genetic loading (e.g., autism, schizophrenia). Sudden Onset of Psychosis + Substance Use → Consider substance‑induced psychotic disorder. Chronic Sleep Disruption + Mood Lability → Possible bipolar disorder or mood‑related sleep disorder. Rigid, maladaptive interpersonal patterns from early adulthood → Personality disorder. --- 🗂️ Exam Traps Distractor: “All anxiety disorders are treated with benzodiazepines.” – Wrong; first‑line is CBT or SSRIs; benzodiazepines are secondary. Misleading Choice: “DSM‑5‑TR allows diagnosis of normal grief.” – Incorrect; normal grief is explicitly excluded. Near‑Miss: “Schizophrenia always presents with hallucinations.” – False; delusions, disorganized thought, or negative symptoms can dominate. Trap: “p‑factor replaces all disorder categories.” – Incorrect; p‑factor is a research model, not a diagnostic system. Confusion: “Personality disorders are coded dimensionally in DSM‑5.” – Wrong; DSM‑5 uses categorical diagnoses; ICD‑11 uses dimensional severity. ---