Diagnostic Criteria & Classification Systems in Abnormal Psychology

TAKEAWAYS:

• Mental disorders are classified using standardized systems like the DSM-5-TR (Diagnostic and Statistical Manual of Mental Disorders) and ICD-11 (International Classification of Diseases) to ensure consistency and reliability.
• Diagnostic criteria for disorders like schizophrenia, depression, and anxiety disorders are based on observable symptoms, duration, and impairment, not just subjective experiences.
• Cultural formulation interviews are critical to avoid misdiagnosis by accounting for cultural beliefs, values, and expressions of distress.
• Mental status examinations (e.g., appearance, speech, mood, cognition) help clinicians assess current psychological functioning.
• Differential diagnosis is essential to distinguish between similar disorders (e.g., bulimia nervosa vs. binge-eating disorder).
• Assessment methods (clinical interviews, psychological tests, biological markers) each have strengths and limitations, and no single method is universally superior.

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1. Introduction to Diagnostic Criteria and Classification Systems

Diagnostic criteria and classification systems are the backbone of abnormal psychology, enabling clinicians to identify, diagnose, and treat mental disorders systematically. Without these systems, mental health care would lack reliability, validity, and consistency. The two most widely used classification systems today are:

• DSM-5-TR (Diagnostic and Statistical Manual of Mental Disorders, 5th Edition, Text Revision) by the American Psychiatric Association (APA).
• ICD-11 (International Classification of Diseases, 11th Revision) by the World Health Organization (WHO).

Both systems aim to:

• Provide clear, objective criteria for diagnosing mental disorders.
• Reduce subjectivity in diagnosis.
• Facilitate communication among clinicians.
• Guide research and treatment planning.

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1.1 Historical Evolution of Classification Systems

Classification systems have evolved from supernatural explanations (e.g., demonic possession) to biological and psychological models. Key milestones:

Why does this matter?

• Early systems were subjective (e.g., DSM-I relied on clinical judgment).
• DSM-III introduced operationalized criteria (symptoms must meet specific thresholds), improving reliability.
• ICD-11 now includes cultural formulations, addressing global diversity.

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1.2 DSM-5-TR vs. ICD-11: Key Differences

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2. Diagnostic Criteria for Major Mental Disorders

Diagnostic criteria are standardized rules that define a mental disorder. They typically include:

• Symptom clusters (e.g., depressed mood, anhedonia for depression).
• Duration (e.g., symptoms must persist for ≥2 weeks for MDD).
• Impairment (e.g., social, occupational, or functional decline).
• Exclusion criteria (e.g., symptoms not better explained by another disorder).

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2.1 Schizophrenia: Diagnostic Criteria (DSM-5-TR)

Schizophrenia is a psychotic disorder characterized by delusions, hallucinations, disorganized speech, grossly disorganized behavior, and negative symptoms (e.g., flat affect).

DSM-5-TR Criteria:

1. Two or more of the following, each present for a significant portion of time during a 1-month period:
   • Delusions
   • Hallucinations
   • Disorganized speech
   • Grossly disorganized or catatonic behavior
   • Negative symptoms (e.g., diminished emotional expression)
2. Social/occupational dysfunction (e.g., inability to work or maintain relationships).
3. Duration: Continuous signs of the disturbance persist for ≥6 months, with at least 1 month of active symptoms.
4. Exclusion: Schizoaffective disorder and depressive/manic episodes are ruled out.

A flowchart showing how symptoms (e.g., delusions, hallucinations) combine to meet DSM-5-TR criteria for schizophrenia.

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2.2 Mood Disorders: Depression and Bipolar Disorder

Major Depressive Disorder (MDD)

DSM-5-TR Criteria (5+ symptoms for ≥2 weeks):

• Depressed mood (most of the day, nearly every day).
• Diminished interest/pleasure (anhedonia).
• Significant weight/appetite changes.
• Insomnia or hypersomnia.
• Psychomotor agitation/retardation.
• Fatigue or loss of energy.
• Feelings of worthlessness/excessive guilt.
• Diminished ability to think/concentrate.
• Recurrent thoughts of death/suicide.

Worked Example: Depression in a Nepali Context Case: A 28-year-old woman in Kathmandu reports:

• "I can’t get out of bed in the morning."
• "I don’t enjoy cooking for my family anymore."
• "I’ve lost 5 kg in a month."
• "I keep thinking about my failed exams."

Diagnosis: Likely MDD (5/5 criteria: depressed mood, anhedonia, weight loss, fatigue, suicidal ideation).

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Bipolar Disorder (Type I and II)

• Bipolar I: At least one manic episode (e.g., euphoria, impulsivity, grandiosity).
• Bipolar II: Hypomanic episodes (less severe than mania) + major depressive episodes.

A graph showing the cyclical nature of bipolar disorder, with manic, hypomanic, and depressive phases.

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2.3 Anxiety Disorders: Generalized Anxiety Disorder (GAD)

DSM-5-TR Criteria (6+ months):

• Excessive anxiety/worry about multiple events (e.g., health, work, finances).
• Difficulty controlling worry.
• 3+ symptoms:
  • Restlessness
  • Fatigue
  • Irritability
  • Muscle tension
  • Sleep disturbance

Real-World Link: Anxiety in Daraz Customers Example: A Daraz shopper experiences panic attacks before placing an order due to fear of fraud. Their symptoms (rapid heartbeat, avoidance behavior) align with panic disorder, a subtype of anxiety disorders.

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2.4 Eating Disorders: Bulimia Nervosa vs. Binge-Eating Disorder

A table comparing bulimia nervosa and BED with real-life examples (e.g., a person who vomits after binges vs. one who overeats secretly).

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3. Assessment Methods in Abnormal Psychology

Diagnosis relies on multiple assessment methods to ensure accuracy. Each has strengths and limitations:

A checklist used by clinicians during a mental status exam, covering appearance, mood, thought processes, and cognitive function.

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3.1 Mental Status Examination (MSE)

The MSE is a structured observation of a patient’s current psychological state. Key components:

1. Appearance: Dress, hygiene, posture.
2. Behavior: Motor activity, facial expressions.
3. Speech: Rate, volume, fluency.
4. Mood/Affect: Emotional tone (e.g., depressed, anxious).
5. Thought Process: Logical flow, delusions, obsessions.
6. Cognition: Memory, attention, orientation.

Worked Example: MSE in a Schizophrenia Patient Case: A patient arrives disheveled, speaks in fragmented sentences, and reports auditory hallucinations ("Voices tell me I’m being watched"). Findings:

• Appearance: Poor hygiene → negative symptom.
• Speech: Disorganized → thought disorder.
• Thought Process: Delusions → psychotic symptom.

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3.2 Cultural Formulation Interview (CFI)

The CFI is a WHO-developed tool to assess how culture influences mental health symptoms. Key questions:

• How does the patient’s cultural background shape their experience of distress?
• Are there cultural explanations for their symptoms?
• How does the patient’s cultural identity affect their help-seeking?

Real-World Example: CFI in Nepal Scenario: A Dalit woman in a rural village describes "spirit possession" after losing her job. A CFI might reveal:

• Her symptoms align with local beliefs about jhauk (spirit possession).
• She avoids seeking treatment due to stigma in her community. Why it matters: Without the CFI, a clinician might misdiagnose this as schizophrenia instead of recognizing culture-bound syndrome.

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4. Differential Diagnosis: Avoiding Misclassification

Differential diagnosis is the process of distinguishing between similar disorders. For example:

Case: A patient reports:

• "I eat a whole pizza in one sitting, then feel guilty."
• "I exercise excessively to ‘burn off’ the calories."

Possible Diagnoses:

1. Bulimia Nervosa: Binge eating + compensatory behaviors (e.g., vomiting, exercise).
2. Binge-Eating Disorder (BED): Binge eating without compensation.
3. Anorexia Nervosa: Restrictive eating + fear of weight gain (less likely here).

Diagnostic Decision Tree:

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5. Limitations and Challenges in Diagnosis

Despite standardized systems, challenges remain:

• Overlap between disorders (e.g., depression and anxiety often co-occur).
• Cultural bias (e.g., Western DSM criteria may not fit Nepali contexts).
• Stigma and underreporting (e.g., men less likely to report depression).
• Comorbidity (e.g., schizophrenia + substance abuse complicates treatment).

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In the Real World

1. eSewa/Khalti: Handling Financial Anxiety

   • Idea Used: Anxiety disorders (e.g., panic attacks when transactions fail).
   • How: eSewa’s customer support teams are trained to recognize anxiety symptoms (e.g., rapid speech, avoidance) and provide calm, structured responses to reduce distress.
   • Example: A user panics after a failed payment. A support agent uses active listening (a cognitive-behavioral technique) to de-escalate the situation.

2. Pathao Drivers: Burnout and Mood Disorders

   • Idea Used: Depression and stress-related disorders.
   • How: Pathao drivers often experience chronic stress (traffic, customer complaints) leading to depressive symptoms (fatigue, irritability).
   • Real-Life Fix: Some Pathao hubs now offer mental health workshops (based on cognitive-behavioral therapy) to help drivers manage stress.

3. NEPSE Traders: Obsessive-Compulsive Disorder (OCD)

   • Idea Used: Obsessive-compulsive patterns (e.g., checking stock prices repeatedly).
   • How: Some traders develop compulsive behaviors (e.g., refreshing screens, overanalyzing data) due to anxiety about losses.
   • Worked Example: A trader checks NEPSE’s live data every 5 minutes, even when markets are closed. This aligns with OCD’s compulsive rituals.

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Exam Tip

1. For descriptive questions (e.g., "Outline diagnostic criteria for schizophrenia"):

   • Structure your answer with clear headings (e.g., "DSM-5-TR Criteria," "Exclusion Rules").
   • Use examples (e.g., "A patient with delusions + hallucinations for 6 months meets criteria").
   • Compare with ICD-11 if asked (e.g., "ICD-11 adds cultural formulations").

2. For justification questions (e.g., "Abnormal behaviors result from biological, behavioral, cognitive, and emotional forces"):

   • Link each perspective to diagnosis:
     • Biological: Neurochemical imbalances (e.g., serotonin in depression).
     • Behavioral: Learned avoidance (e.g., agoraphobia after a panic attack).
     • Cognitive: Negative thought patterns (e.g., "I’m worthless" in depression).
     • Emotional: Trauma leading to PTSD.

3. For comparison questions (e.g., "Differentiate bulimia and BED"):

   • Use a table (as shown above) with clear columns (symptoms, frequency, body image).
   • Highlight key differences (e.g., "Bulimia has compensatory behaviors; BED does not").

4. For assessment questions (e.g., "Methods to assess abnormal behavior"):

   • List methods (clinical interview, MSE, psychological tests).
   • Debate pros/cons (e.g., "Mental status exams are reliable but time-consuming").
   • Avoid absolute claims (e.g., "No method is universally better" because context matters).

5. For cultural questions (e.g., "Why is CFI important?"):

   • Explain bias risks (e.g., "DSM criteria may pathologize normal behaviors in Nepali culture").
   • Give a real example (e.g., "A Dalit woman’s ‘spirit possession’ might be misdiagnosed as schizophrenia").
   • Link to treatment (e.g., "CFI helps tailor therapy to cultural beliefs").

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Final Note: Always connect theory to real life—examiners love it when you tie DSM criteria to Nepali contexts (e.g., Pathao drivers, NEPSE traders). Use tables, flowcharts, and real examples to stand out!