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Forensic Psychiatry - Comprehensive Exam Guide

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1. Definition & Scope

• Psychologist: No medical degree; uses tests of intelligence/personality to study normal and abnormal mental functioning
• Psychiatrist: Has a medical degree

• Determining criminal responsibility
• Sexual psychopathy (rape, homosexuality, transvestism, pedophilia, fetishism)
• Competence in contract actions
• Competence to testify
• Ability to give informed consent
• Competency to stand trial
• Testamentary capacity (capacity to make a will)
• Malingering

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2. Legal & Ethical Issues in Forensic Psychiatry

1. During admission, treatment, and discharge of a mentally ill person
2. Evaluating ability to consent when a crime is committed
3. Differentiating between psychosis and neurosis
4. Differentiating between true and feigned mental illness
5. Nominating legal representatives
6. Validity of marriage

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3. Common Defence Pleas

(A) Unsound Mind / Insanity (Section 84 IPC - India)

"Nothing is an offence which is done by a person who, at the time of doing it, is by reason of unsoundness of mind, incapable of knowing the nature of the act, or that he is doing what is either wrong or contrary to law."

(B) Drunkenness

• Section 85 IPC: Not an offence if intoxicated substance was administered without the person's knowledge or against their will and the person could not know nature/wrongness of the act
• Section 86 IPC: Voluntary intoxication does NOT absolve criminal intent - person presumed to have knowledge of consequences

(C) Delirium

• Clouding of consciousness, disorientation, delusions, hallucinations
• Person not legally responsible under Section 84 IPC
• Patient may commit suicide or violent acts impulsively

(D) Impulse (Irresistible Impulse)

• Sudden, irresistible force compelling conscious performance of acts without motive
• Types: Kleptomania (stealing), Pyromania (fire-setting), Mutilomania (maiming animals), sexual impulses
• Legal rule: As long as the patient can still differentiate right from wrong, the defence of irresistible impulse is NOT tenable. An irresistible impulse must be such as no one could resist (e.g., running from a burning building)
• Associated disorders: mental subnormality, dementia, schizophrenia, manic-depressive states, obsessive-compulsive neurosis, epileptic psychosis

(E) Somnambulism (Sleepwalking)

• Dissociative state occurring in sleep
• More common in children
• Person may commit theft or even murder in this state
• Good defence plea for criminal offenses - person is not in full conscious awareness

(F) Somnolentia (Semi-somnolence)

• State midway between sleep and waking - confused mind
• Similar to post-epileptic fit state

(G) Hypnotism

• NOT a tenable defence plea - a person cannot be hypnotised against their will

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4. McNaghten Rules (The Core Legal Test for Insanity)

1. Was labouring under defect of reason from disease of the mind, AND
2. Did not know the nature and quality of the act he was doing, OR
3. If he did know the nature of the act, he did not know that what he was doing was wrong or contrary to law

The defence can only be founded on a known and nameable disease of the mind. Rage, jealousy, transient loss of control, and unresisted impulse do not suffice.

Criticism of McNaghten Rules

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5. Modifications / Alternative Tests

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6. Abnormal Mental States - Key Definitions

Types of Hallucinations (Exam Favourite)

1. Visual - commonest in organic disorders, delirium tremens, focal CNS lesions
2. Auditory - commonest in functional disorders (schizophrenia)
3. Olfactory - organic brain disease, major depression
4. Gustatory - organic brain disease, temporal lobe epilepsy
5. Tactile (haptic) - cocainism (cocaine abuse)
6. Command hallucinations - voices ordering dangerous acts; may incite suicide or homicide
7. Psychomotor - feeling of movement in absence of actual movement
8. Microptic/macroptoptic - objects appear smaller or larger

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7. Psychopathic Personality (Antisocial Personality Disorder)

• Person who is neither insane nor mentally defective but fails to conform to normal standards of behaviour
• Not a ground for insanity defence - may provide a plea of diminished responsibility
• DSM-5 criteria (301.7 / F60.2):
  • Criterion A: Disregard for others' rights since age 15, shown by: failure to obey laws, lying/deceit, impulsivity, irritability/aggression, recklessness, irresponsibility, lack of remorse
  • Criterion B: Person is at least age 18
  • Criterion C: Conduct disorder present before age 15
  • Criterion D: Not occurring exclusively during schizophrenia or bipolar disorder
• Features: no abnormality of thought/mood/intelligence; child-like selfishness; lack of emotional response; lack of conscience

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8. Civil Responsibilities of the Mentally Ill

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9. Malingering

• Deliberate feigning or gross exaggeration of symptoms for secondary gain (avoiding military service, criminal punishment, obtaining compensation)
• Suspect malingering when: symptoms are inconsistent, exaggerated, overly dramatic, or contradict objective findings
• Distinguished from factitious disorder (where the motivation is sick-role adoption, not external gain)

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10. Mental Health Act (India) - Key Points

• Provides for admission, treatment, and discharge of mentally ill persons
• Voluntary admission: patient's own request
• Involuntary/supervised community treatment: where risk to self or others
• Rights of patients: to dignity, information, access to medical records, legal aid
• Mental Health Review Boards oversee involuntary admissions

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Quick-Revision Summary Table

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Yenepoya University - Community Medicine Previous Year Question Papers

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1. Yenepoya Official Institutional Repository (Best Source)

• Yenepoya E-Resources portal: yenepoya.edu.in/E-resourses.php
• Yenepoya Medical College Library: library.yenepoya.edu.in

The e-PAC and institutional repository section contains previous years' question papers. Access may require your campus login / institutional credentials. The library handbook confirms these are available to enrolled students.

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2. FirstRanker.com (Verified External Source)

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3. HELINET Consortium (RGUHS)

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Important Note

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🏥 Community Medicine (PSM) - High-Yield Exam Study Guide

Sources: Park's Textbook of Preventive & Social Medicine; Essentials of Forensic Medicine & Toxicology (36th ed.); Prepladder/DigiNerve high-frequency topic analysis

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UNIT 1: CONCEPTS OF HEALTH AND DISEASE ⭐⭐⭐

Definitions of Health

Determinants of Health (Lalonde Model)

1. Human biology - genetics, ageing
2. Environment - physical, social, biological
3. Lifestyle - personal behaviour
4. Health care organization - availability, quality of services

Spectrum of Disease / Natural History of Disease

• Pre-pathogenesis phase - interaction of agent, host, environment before disease
• Pathogenesis phase - onset of disease, early disease, advanced disease, outcomes
• Iceberg phenomenon - clinical cases are the "tip"; subclinical cases are the hidden mass below

Levels of Prevention ⭐⭐⭐

Key rule: Primordial = prevent risk factors; Primary = prevent disease; Secondary = early detect; Tertiary = prevent disability

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UNIT 2: EPIDEMIOLOGY ⭐⭐⭐

Epidemiological Triad

• Agent - biological, chemical, physical, nutritional, social
• Host - age, sex, genetics, immunity, nutrition, behaviour
• Environment - physical (climate), biological (vectors), social (crowding, sanitation)

Measures of Disease Frequency ⭐⭐⭐

Relationship: Prevalence ≈ Incidence × Duration of disease

Mortality Rates ⭐⭐⭐

Study Designs ⭐⭐⭐

Measures of Association

RR > 1 = positive association; RR < 1 = protective effect; RR = 1 = no association

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UNIT 3: BIOSTATISTICS ⭐⭐⭐

Types of Data

• Nominal - categories with no order (blood group, sex)
• Ordinal - ordered categories (mild/moderate/severe)
• Interval - equal intervals, no true zero (temperature in °C)
• Ratio - true zero exists (weight, height, blood pressure)

Measures of Central Tendency

Normal Distribution

• Mean ± 1 SD = 68.27% of values
• Mean ± 2 SD = 95.45% of values
• Mean ± 3 SD = 99.73% of values

Screening Test Parameters ⭐⭐⭐

              Disease +    Disease -
Test +           TP           FP
Test -           FN           TN

Critical rule: PPV increases as disease prevalence increases. NPV decreases as prevalence increases.

Key Statistical Tests

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UNIT 4: IMMUNIZATION & VACCINES ⭐⭐⭐

Universal Immunization Programme (UIP) Schedule - India

Key Immunization Milestones - India

• 1962 - First vaccine introduced (BCG) under National TB Programme
• 1978 - EPI launched (BCG, DPT, OPV, Typhoid - urban)
• 1985 - Universal Immunization Programme (UIP) - measles added
• 1995 - Polio National Immunization Days (NIDs)
• 2014 - India and South-East Asia certified Polio-Free
• 2015 - Maternal and Neonatal Tetanus eliminated; Pentavalent expanded to all states
• 2017 - MR (Measles-Rubella) vaccine introduced; PCV launched

Cold Chain ⭐⭐

• ILR (Ice-Lined Refrigerator): +2°C to +8°C - stores vaccines (not freeze-sensitive vaccines at bottom)
• Deep Freezer: -15°C to -25°C - stores OPV
• Freeze-sensitive vaccines (must NOT freeze): TT, DPT, Hep B, DT, Td
• Cold chain equipment levels: GNP → Regional → District → PHC → Sub-centre → Community

Types of Immunity

Herd Immunity

• Definition: Protection of susceptible persons in a community due to the immunity of a sufficiently large proportion of the population
• When herd immunity threshold is exceeded, epidemic cannot sustain itself
• Thresholds: Measles ~95%, Polio ~80-85%, Smallpox ~80%

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UNIT 5: COMMUNICABLE DISEASES ⭐⭐⭐

Modes of Disease Transmission

Key Communicable Diseases - Exam Focus

• Causative agent: Mycobacterium tuberculosis
• Transmission: Airborne (droplet nuclei)
• Mantoux test (TST): >10 mm = positive in general population; >5 mm in immunocompromised
• RNTCP/National TB Elimination Programme (NTEP): Target - TB-free India by 2025
• DOTS (Directly Observed Treatment Short-course): cornerstone of TB control

• P. falciparum = malignant tertian (most dangerous; causes cerebral malaria)
• P. vivax = benign tertian; can relapse (hypnozoites in liver)
• P. malariae = quartan fever (72-hour cycle)
• Vector: Female Anopheles mosquito (bites at dusk/night)
• National Vector Borne Disease Control Programme (NVBDCP)

• Vector: Aedes aegypti (day-biting mosquito)
• Widal-like test: not applicable; NS1 antigen, IgM/IgG serology
• Dengue Shock Syndrome and Dengue Haemorrhagic Fever = severe forms

• Window period: 2-12 weeks (time between infection and antibody detection)
• CD4 count <200/µL = AIDS-defining condition
• PPTCT (Prevention of Parent-to-Child Transmission): ARV prophylaxis in pregnancy
• ICTC (Integrated Counselling and Testing Centres): free HIV testing in India

• Mycobacterium leprae; longest incubation period (2-10 years)
• Paucibacillary (PB): <5 skin lesions; Multibacillary (MB): >5 lesions
• MDT (Multi-Drug Therapy): Rifampicin + Dapsone ± Clofazimine
• NLEP (National Leprosy Eradication Programme): target <1/10,000 prevalence

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UNIT 6: NATIONAL HEALTH PROGRAMMES ⭐⭐⭐

Key National Health Programmes - India

Health Infrastructure (India) ⭐

ASHA (Accredited Social Health Activist)

• Community health worker at village level (1 per 1000 population)
• Works as a link between community and health system
• Incentive-based (not salaried) worker
• Key roles: Institutional delivery promotion, immunization, TB DOTS support, newborn care

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UNIT 7: MATERNAL AND CHILD HEALTH ⭐⭐⭐

Antenatal Care (ANC)

• Minimum 4 ANC visits (WHO recommends 8+)
• 1st visit: <12 weeks - registration, blood group, Hb, urine, HIV, syphilis, weight, height
• TT vaccination: 2 doses (TT1 at 16 weeks, TT2 4 weeks later) OR single booster if previously vaccinated
• Iron-Folic Acid (IFA): 100mg Fe + 500µg folic acid daily from 14 weeks
• Anaemia in pregnancy: Hb <11 g/dL; severe if <7 g/dL

Millennium/Sustainable Development Goals (Health-related)

• SDG 3.1: Reduce global MMR to <70/100,000 live births by 2030
• SDG 3.2: End preventable deaths of newborns and children under 5; NMR <12, U5MR <25 by 2030
• SDG 3.3: End epidemic of AIDS, TB, malaria, and neglected tropical diseases by 2030

Child Growth Standards

• IAP growth charts (Indian): based on Indian children
• WHO growth standards: based on children raised under optimal conditions
• Z-score / Standard Deviation classification: used for nutrition assessment

IMNCI (Integrated Management of Neonatal and Childhood Illness)

• Assess child for danger signs: unable to drink/breastfeed, vomiting everything, convulsions, lethargic/unconscious
• Classification system for illness: severe, non-severe, no disease

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UNIT 8: NUTRITION ⭐⭐⭐

Protein-Energy Malnutrition (PEM)

Nutritional Deficiency Diseases ⭐⭐⭐

Oral Rehydration Therapy (ORS) - WHO 2002

• Na: 75 mmol/L, Cl: 65 mmol/L, Glucose: 75 mmol/L, K: 20 mmol/L
• Osmolarity: 245 mOsm/L (reduced osmolarity ORS)

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UNIT 9: ENVIRONMENTAL HEALTH ⭐⭐

Water

• Safe water requirement: 40-70 L/person/day
• Bacteriological standard: 0 coliforms per 100 mL
• Residual chlorine: 0.5 mg/L after 30 minutes contact time
• Chlorine demand = chlorine applied - residual chlorine
• Purification steps: Sedimentation → Coagulation (alum) → Filtration → Disinfection (chlorination)

Air Pollution

• NAAQS (National Ambient Air Quality Standards)
• PM2.5 (<2.5 µm): penetrates deep into alveoli; most dangerous
• Sources: vehicles, industry, biomass burning

Housing Standards

• Cubic space: minimum 14.2 m³/person in sleeping room
• Window area: 1/10th of floor area
• Overcrowding: defined as occupancy ratio >1.5 persons/room OR <5.6 m² sleeping area/person

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UNIT 10: DEMOGRAPHY & FAMILY PLANNING ⭐⭐

Demographic Indicators - India (approx.)

Demographic Transition Theory ⭐

• Stage 1: High BR + High DR = Low growth (pre-industrial)
• Stage 2: High BR + Falling DR = Rapid growth (developing countries)
• Stage 3: Falling BR + Low DR = Slowing growth
• Stage 4: Low BR + Low DR = Stable population (developed countries)
• India is currently in late Stage 2 / early Stage 3

Contraceptive Methods

Family Planning - India

• Mission Parivar Vikas: Focus on 146 high TFR districts; target TFR 2.1 by 2025
• MTP Act 1971 (amended 2021): Medical termination up to 20 weeks (24 weeks in special categories) with provider approval

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UNIT 11: OCCUPATIONAL HEALTH ⭐⭐

Occupational Diseases ⭐⭐⭐

Pneumoconioses Comparison

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UNIT 12: HEALTH PLANNING & MANAGEMENT ⭐

Five-Year Plans (Key highlights)

• 1st Plan (1951-56): Emphasis on agriculture and malaria control
• Bhore Committee (1946): Foundation of Indian health policy; recommended PHC concept
• Mudaliar Committee (1962): Strengthening of medical education and health infrastructure
• Alma-Ata Declaration (1978): "Health for All by 2000"; Primary Health Care as the key
• Ottawa Charter (1986): Health promotion; 5 action areas
• SDGs (2015-2030): 17 goals; SDG 3 = Good Health and Well-Being

Health Indicators Summary

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QUICK-REVISION MNEMONICS

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EXAM PATTERN (Yenepoya / CBME 3rd Prof)

• Levels of prevention with natural history of disease diagram
• Study designs - advantages and disadvantages (case-control vs. cohort)
• Sensitivity, specificity, PPV, NPV - calculations
• Cold chain in UIP
• IMR - definition, causes, methods of reduction
• National TB Elimination Programme / DOTS
• Nutritional deficiency diseases
• Demographic transition theory

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