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PSM (Preventive & Social Medicine / Community Medicine) for Final Year MBBS. Here are the high-yield topics based on standard university exam patterns:
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PSM community medicine final year MBBS important topics university exam 2025 2026
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Here is a well-organized, exam-focused breakdown of the most important PSM topics for Final Year MBBS university exams:
PSM - Final Year MBBS: Important Topics for University Exam
1. Epidemiology (Highest Yield - Always in Theory + Viva)
- Study designs - Case control, Cohort, RCT, Cross-sectional - definitions, advantages, disadvantages
- Measures of association - Relative Risk (RR), Odds Ratio (OR), Attributable Risk (AR) - with calculations
- Bias - Selection, Information, Confounding
- Screening - Sensitivity, Specificity, PPV, NPV, Likelihood ratio (2x2 table calculations are compulsory)
- Types of epidemics - Common source, Propagated, Mixed
- Epidemic investigation steps
- Iceberg phenomenon, Spectrum of disease, Herd immunity
2. Biostatistics (Numericals almost guaranteed)
- Types of data, Scales of measurement
- Measures of central tendency and dispersion (Mean, Median, Mode, SD)
- Normal distribution, Skewed distribution
- Tests of significance - Chi-square, t-test, p-value, confidence interval
- Sampling methods
- Correlation & Regression
3. Demography and Vital Statistics
- Birth rate, Death rate, Infant Mortality Rate (IMR), Maternal Mortality Ratio (MMR) - definitions + current India values
- Total Fertility Rate (TFR), Net Reproduction Rate (NRR)
- Census - India census basics
- Health indicators - PQLI, HDI
- Life table, Dependency ratio
4. National Health Programmes (Very High Yield for Theory Essays)
- Revised National TB Control Programme (RNTCP) / National TB Elimination Programme (NTEP) - DOTS, drug regimens, TB-free India targets
- Universal Immunization Programme (UIP) - Full schedule, cold chain, vaccines added recently
- Reproductive Child Health (RCH) Programme - ANC, PNC, JSSK, JSY
- National Vector Borne Disease Control Programme - Malaria, Dengue, Filaria, Kala-azar, JE
- NVBDCP, NACP (HIV/AIDS), National Cancer Control Programme
- Ayushman Bharat, PMJAY
- Mid-day Meal Scheme, ICDS, Poshan Abhiyan
5. Immunization and Vaccines (Always Asked)
- Cold chain - equipment, temperature, VVM (Vaccine Vial Monitor)
- UIP immunization schedule - complete with age, route, dose
- New vaccines - Rotavirus, PCV, IPV, fIPV
- AEFI (Adverse Events Following Immunization)
- EPI, oral vs injectable polio
- Herd immunity thresholds
6. Communicable Diseases (Short notes + SAQ)
Must-know diseases:
- Malaria - Life cycle, diagnosis (thick smear), treatment, DDT, ABER
- Tuberculosis - full coverage including MDR-TB, End TB
- HIV/AIDS - NACP, Window period, OI prophylaxis, PMTCT
- Dengue - NS1, DHF grading, vector control
- Cholera - El Tor, ORS, fluoride treatment
- Polio - AFP surveillance, types of vaccines
- Measles/Rubella - MR vaccine, elimination targets
- Hepatitis A, B, E - comparison
- Rabies, Tetanus (neonatal tetanus)
7. Nutrition (Short Notes Very Common)
- PEM - Kwashiorkor vs Marasmus - clinical features, MUAC, Gomez classification
- Vitamin A deficiency - Bitot's spots, Keratomalacia, VHND
- Iron Deficiency Anaemia - WIFS, RBSK
- Iodine Deficiency Disorders - Goitre grading, IDD control
- Fluorosis, Vitamin D deficiency (Rickets)
- Nutritional surveys - NNMB, NFHS
- Food adulteration, Food Safety and Standards Act (FSSAI)
- Breastfeeding - WHO recommendations, IYCF
8. Environment and Health
- Water - Standards (WHO/BIS), purification methods, chlorination (breakpoint chlorination, CT value), hardness, fluoride
- Air pollution - Indoor (biomass) vs outdoor, SPM, RSPM, PM2.5
- Sewage disposal - Septic tank, soak pit, sullage, night soil
- Solid waste management - Biomedical waste categories (BMWM Rules 2016)
- Housing and overcrowding - standards
- Radiation - ionizing vs non-ionizing
9. Family Planning / Reproductive Health
- Contraception methods - OCPs, condoms, Cu-T, MTP, sterilization
- Medical Termination of Pregnancy (MTP) Act - recent 2021 amendment (up to 24 weeks)
- IUCD types - Cu-380A, LNG-IUS
- Failure rates (Pearl Index)
- NSV (No-scalpel vasectomy)
- PCPNDT Act
10. Occupational Health
- Occupational lung diseases - Silicosis, Asbestosis, Coal Workers' Pneumoconiosis, Bagassosis, Byssinosis - causes, distinguishing features
- Heavy metal poisoning - Lead, Mercury, Arsenic
- Noise-induced hearing loss, Occupational cancer
- Factories Act provisions
11. Non-Communicable Diseases
- Hypertension - JNC-8/current classification, risk factors, preventive measures
- Diabetes Mellitus - NDCP, criteria (WHO/ADA)
- Coronary Artery Disease - Framingham Risk Score, NPCDCS
- Obesity - BMI cut-offs (Asian: overweight ≥23, obese ≥25), waist-hip ratio
- Cancer control programme
- Mental health - NMHP
12. Health Planning and Administration
- Levels of Healthcare - Primary (PHC, Sub-centre, UPHC), Secondary, Tertiary
- PHC - population coverage, staffing, IPHS norms
- ASHA, AWW, ANM - roles and functions
- National Health Policy 2017 targets
- Health indicators and indices
- International agencies - WHO, UNICEF, UNFPA, World Bank
13. Social Sciences and Health
- Social determinants of health - education, income, social support
- Culture and health, health beliefs
- Urban health problems
- School health programme - components
14. Geriatrics and Preventive Medicine in Special Groups
- Preventive geriatrics, healthy aging
- School health, Adolescent health (RKSK)
- Antenatal care schedule, ANC screening
Tips for Exam Preparation
| What to focus on | Why |
|---|---|
| Park's Textbook (21st/22nd Ed.) | Standard university reference |
| Numericals from Biostatistics & Epidemiology | Always in theory paper |
| Current national programme targets & latest data | Long essay staples |
| Short notes on vaccines, diseases, nutrition deficiencies | 5-10 mark questions |
| Definitions (WHO, IHR, etc.) | Viva & 2-mark questions |
Most likely long essay topics: Universal Immunization Programme, DOTS/NTEP, Epidemiological study designs, Water purification, PHC in India, Malaria control, Nutritional deficiencies in India, National Health Policy 2017, Epidemiological investigation of an outbreak.
Most likely short notes: Herd immunity, Cold chain, MUAC, Sensitivity & Specificity, Iceberg phenomenon, ASHA, MTP Act, Biomedical waste management, Framingham Risk Score, Pearl Index.
Leprosy ? Isn't imp
Leprosy is absolutely important for PSM university exams - it's a classic long essay and short note topic. Let me pull the full details from the textbook.
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leprosy PSM community medicine important exam topics MBBS Park's textbook NLEP
The library doesn't have Park's PSM directly, but I have all the standard content. Here is a complete, exam-ready coverage of Leprosy for PSM:
Leprosy - PSM University Exam (Complete Coverage)
Yes, Leprosy is highly important - it is a frequent long essay (10 marks) and short note (5 marks) topic. Here's everything you need:
1. Basic Facts (Always State in Introduction)
| Feature | Detail |
|---|---|
| Causative agent | Mycobacterium leprae (Hansen's bacillus) |
| Discovered by | Gerhard Armauer Hansen (1873) |
| Type | Obligate intracellular, acid-fast bacillus |
| Doubling time | ~12-14 days (slowest of all bacteria) |
| Cannot be cultured | In artificial media; grown in armadillo footpads |
| Affects | Skin, peripheral nerves, mucosa, eyes |
2. Epidemiology
- India's status: Achieved elimination (prevalence <1/10,000) at national level in 2005; some states still endemic
- Prevalence Rate (PR): <1 per 10,000 population (elimination target)
- New Case Detection Rate (NCDR): India contributes ~50-60% of global new cases
- Most affected states: Chhattisgarh, Odisha, Jharkhand, Bihar, West Bengal, UP
- World Leprosy Day: Last Sunday of January (Remembrance of Mahatma Gandhi's death)
- Grade 2 disability (G2D): Key indicator of late detection
3. Transmission
- Source: Untreated lepromatous patient (most infectious)
- Route: Droplet infection (respiratory - nasal secretions) - primary route
- Other routes: Skin-to-skin contact (secondary), soil (M. leprae survives 45 days)
- Incubation period: 2-5 years (average); can be up to 20 years
- Entry point: Upper respiratory tract / broken skin
- NOT transmitted by: Casual contact, toilet seats, insect vectors
4. Classification (Most Exam-Tested Part)
Ridley-Jopling Classification (Immunological - Standard)
| Type | Abbreviation | Bacilli | Immunity | Skin Lesions |
|---|---|---|---|---|
| Tuberculoid | TT | Few (paucibacillary) | High | 1-2, well-defined, anesthetic |
| Borderline Tuberculoid | BT | Few | Moderate-high | Few, less defined |
| Mid-Borderline | BB | Moderate | Unstable | Multiple, "punched out" |
| Borderline Lepromatous | BL | Many | Moderate-low | Multiple |
| Lepromatous | LL | Many (multibacillary) | Low | Diffuse, symmetric, leonine facies |
WHO Classification (Used in NLEP - Field Practical)
| Type | Skin Lesions | Nerve Involvement | Skin Smear | Treatment |
|---|---|---|---|---|
| Paucibacillary (PB) | 1-5 lesions | ≤1 nerve | Negative | 6 months MDT |
| Multibacillary (MB) | >5 lesions | >1 nerve | Positive | 12 months MDT |
Single Lesion PB: 1 skin lesion = ROM therapy (single dose: Rifampicin + Ofloxacin + Minocycline)
5. Clinical Features (Short Notes)
- Tuberculoid: Well-defined hypopigmented macule, loss of sensation, anhidrosis, nerve thickening (ulnar nerve - most common)
- Lepromatous: Diffuse infiltration, nodules, leonine facies, madarosis (loss of lateral eyebrow), saddle-nose deformity, glove-and-stocking anaesthesia
- Pathognomonic: Loss of sensation in skin lesion + nerve thickening = Leprosy
- Nerves commonly affected: Ulnar (claw hand), common peroneal (foot drop), facial (lagophthalmos), greater auricular, radial cutaneous
6. Diagnosis
- Clinical diagnosis (most important in field)
- Slit skin smear - Bacterial Index (BI), Morphological Index (MI)
- Skin biopsy - histopathology
- Lepromin test (Mitsuda reaction): Not diagnostic; indicates immune status
- Positive in TT (good prognosis), Negative in LL (poor prognosis)
- PCR - not routine
7. MDT Regimen (NLEP - Must Memorize)
Paucibacillary (PB) - 6 months
| Drug | Monthly (Supervised) | Daily (Self) |
|---|---|---|
| Rifampicin | 600 mg | - |
| Dapsone | 100 mg | 100 mg |
Multibacillary (MB) - 12 months
| Drug | Monthly (Supervised) | Daily (Self) |
|---|---|---|
| Rifampicin | 600 mg | - |
| Clofazimine | 300 mg | 50 mg |
| Dapsone | 100 mg | 100 mg |
MDT provided free of cost through NLEP/WHO
8. Leprosy Reactions (Short Note Topic)
| Feature | Type 1 (Reversal Reaction) | Type 2 (ENL - Erythema Nodosum Leprosum) |
|---|---|---|
| Occurs in | BT, BB, BL (borderline) | LL, BL (lepromatous end) |
| Mechanism | Cell-mediated immunity (CMI) | Immune complex (Type III hypersensitivity) |
| Skin | Existing lesions become red/swollen | New painful tender nodules |
| Nerve | Acute neuritis - DANGEROUS | Neuritis possible |
| Treatment | Prednisolone | Thalidomide (males) / Prednisolone |
| Timing | During/after treatment | During/after treatment |
9. Disability Grading (WHO) - Viva Favourite
| Grade | Eye | Hand/Foot |
|---|---|---|
| 0 | No problems | No anaesthesia |
| 1 | Reduced vision (not counted without exam) | Anaesthesia present |
| 2 | Severe visual impairment / lagophthalmos | Visible deformity/damage |
- G2D (Grade 2 Disability) = key indicator used to measure program performance
10. National Leprosy Eradication Programme (NLEP)
- Launched: 1983 (renamed from NLCP)
- Objective: Eliminate leprosy (<1/10,000) - achieved nationally in 2005
- Current goal: Zero leprosy / Leprosy-free India
- Sparsh Leprosy Awareness Campaign (SLAC): Annual awareness drive (Jan 30)
- Leprosy Case Detection Campaign (LCDC): Active case detection
- ASHA role: Referral, treatment support, social reintegration
- Integration with general health services post-2005
- Leprosy Unit: District level - DPMR (Disability Prevention & Medical Rehabilitation)
11. Prevention and Control
- No vaccine available (BCG gives partial protection ~50%)
- Early case detection + complete MDT = mainstay
- Contact tracing and chemoprophylaxis (single-dose Rifampicin - post-exposure prophylaxis, under LEC trials)
- Health education to reduce stigma
- Rehabilitation - physical, social, economic
Probable Exam Questions on Leprosy
| Type | Question |
|---|---|
| Long Essay | Epidemiology, clinical types, MDT regimen, and NLEP |
| Short Note | WHO classification of leprosy / Leprosy reactions / NLEP / Disability grading |
| Viva | What is paucibacillary? NLEP launch year? Most infectious type? Lepromin test significance? |
Bottom line: Leprosy covers epidemiology + clinical + program aspects all in one topic - making it a favourite 10-mark long essay. Know the WHO classification, MDT regimen, NLEP, and reactions cold. These are the parts examiners specifically ask about.
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