AIM LEARNING CYCLE | FINAL YEAR MBBS | KMU CURRICULUM
Concept Integration
Topic 2 — Psychiatric, Behavioral & Substance Use Disorders
Neuroscience-III | Psychiatry • Family Medicine • General Medicine
1. The Topic in One Connected Flow
Psychiatric, behavioural and substance use disorders involve interacting biological, psychological, developmental and social factors. These influences can affect emotional regulation, thoughts, behaviour, physical symptom perception and daily functioning. Despite their different presentations, clinical care follows a shared pathway: recognize the symptom pattern, assess contributing factors and safety, identify the likely disorder, and provide individualized treatment with appropriate follow-up.
Trauma • genetic or developmental vulnerability • psychological stress • chronic pain • substance exposure • social adversity
Trauma-related threat responses • obsession–compulsion reinforcement • altered pain processing • neurodevelopmental differences • reward-system adaptation • disturbed mood regulation
PTSD: re-experiencing and avoidance • OCD: intrusive thoughts and rituals • Somatic disorders: distressing physical symptoms • Autism: social communication differences and repetitive patterns • Substance disorders: impaired control, intoxication or withdrawal • Anxiety/depression: emotional and functional changes
Symptom onset, duration and severity → psychosocial and developmental history → substance and medication history → mental-state assessment → physical causes and functional impairment
PHQ-9 for depressive symptoms • GAD-7 for anxiety • focused enquiry for psychosis and substance use • assess suicide risk, severe withdrawal, psychosis and safeguarding concerns
Psychological therapies including CBT/ERP • appropriate SSRIs • developmental and family support • rehabilitation for chronic pain • substance withdrawal and relapse-prevention care • urgent referral for serious safety risks
Monitor symptoms and treatment effects → support adherence → involve family appropriately → improve daily functioning → prevent relapse and complications
2. Key Clinical Connections
Clinical Connection 1 — Trauma, Obsessions & Avoidance
PTSD: Traumatic exposure → intrusive memories and heightened threat response → avoidance maintains distress → trauma-focused CBT reduces trauma-related symptoms.
OCD: Intrusive unwanted thought → anxiety → compulsive ritual → temporary relief reinforces repetition → exposure and response prevention interrupts the cycle.
Clinical Connection 2 — Symptoms, Development & Function
Somatic symptoms/chronic pain: Physical symptoms + heightened distress or altered pain processing → avoidance, poor sleep and reduced function → coordinated biopsychosocial care and graded activity.
Autism: Early neurodevelopmental differences → social communication difficulties and restricted/repetitive behaviours → developmental assessment and hearing evaluation → individualized communication and family support.
Clinical Connection 3 — Substance Use & Primary Care Safety
Substance disorders: Repeated exposure → tolerance and dependence → withdrawal after cessation; severe alcohol withdrawal may produce seizures or delirium → supervised treatment and relapse prevention.
Anxiety/depression consultation: Symptoms + functional decline → clinical assessment and PHQ-9/GAD-7 screening → diagnosis and risk evaluation → shared treatment decisions, follow-up or urgent referral when unsafe.
3. AIM High-Yield Integration Review
Traumatic exposure + persistent intrusion, avoidance and hyperarousal for more than one month → PTSD → trauma-focused therapy; an earlier short-duration presentation may indicate acute stress disorder.
Unwanted obsession → anxiety → ritual provides temporary relief → repeated compulsion; ERP breaks the behavioural reinforcement cycle and SSRIs can reduce symptom severity.
Excessive symptom-related distress and dysfunctional responses → functional impairment; assessment should remain medically attentive while addressing psychological and rehabilitative needs.
Early social communication differences + restricted or repetitive behaviours → developmental assessment; individualized support targets communication and function rather than attempting to medicate core autistic characteristics.
Opioid overdose → respiratory depression and miosis → ventilatory support and naloxone; opioid withdrawal → mydriasis and autonomic symptoms. Severe alcohol withdrawal → seizures or delirium → urgent supervised treatment.
Persistent psychological symptoms + functional impairment → clinical assessment → evidence-based psychotherapy and/or appropriate medication; screen for bipolar symptoms and medical or substance-related contributors.
PHQ-9 and GAD-7 estimate symptom burden → physician interprets the results with psychiatric history, mental-state findings, functioning and risk → individualized clinical decisions and follow-up.
Suicidal intent or plan, dangerous psychotic symptoms, severe intoxication or withdrawal, or immediate safeguarding concerns → urgent assessment and appropriate escalation; patient-centred confidentiality and communication remain essential.
Somatic symptom disorder does not require normal investigations. A genuine physical illness may coexist with excessive health-related anxiety and behaviour. Likewise, a positive psychiatric screening score does not independently establish a diagnosis or replace direct suicide-risk assessment.