SPM

SPM (Social and Preventive Medicine) / Community Medicine

  • A crucial subject in medical education focusing on public health, epidemiology, disease prevention, and healthcare management.

EPIDEMIOLOGY

  • Definition: Study of the distribution and determinants of health-related states in a population.

Types of Epidemiology

  • Descriptive: Answers Who, Where, When (Time, Place, Person).

  • Analytical: Identifies causes & risk factors using Case-Control and Cohort Studies.

  • Experimental: Involves Controlled trials (RCTs).

Measures of Disease Frequency

  • Incidence = New cases / Population at risk

  • Prevalence = Existing cases / Total population

  • Attack Rate = (New cases in an outbreak / Exposed population) × 100

Modes of Disease Transmission

  • Direct: Person to person (Droplet, Contact).

  • Indirect: Via Fomite, Vector, Airborne, Vehicle-borne.

IMMUNIZATION & VACCINES

Types of Immunity

  • Active Immunity:

    • Natural (Infection)

    • Artificial (Vaccine)

  • Passive Immunity:

    • Natural (Maternal IgG)

    • Artificial (Immunoglobulin)

Vaccination Schedule (India, NIS)

  • At Birth: BCG, Hep B, OPV-0

  • 6 Weeks: Pentavalent-1, OPV-1, Rotavirus-1, PCV-1

  • 10 Weeks: Pentavalent-2, OPV-2, Rotavirus-2, PCV-2

  • 14 Weeks: Pentavalent-3, OPV-3, Rotavirus-3, PCV-3

  • 9-12 Months: MR-1, JE-1

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  • 16-24 Months: DPT booster, OPV booster, MR-2

  • 5 Years: DPT booster

  • 10 & 16 Years: Td vaccine

Cold Chain & Storage of Vaccines

  • BCG, OPV, Measles: Freezer (-15 to -25°C)

  • DPT, TT, Hep B: Refrigerator (2-8°C)

  • Reconstituted vaccines: Use within 4 hours.

HEALTHCARE SYSTEM & PROGRAMS

Levels of Healthcare

  • Primary: PHC, Sub-Center (Preventive, Basic Treatment)

  • Secondary: District Hospital (Specialized Care)

  • Tertiary: AIIMS, Medical Colleges (Advanced Care)

Important Health Programs in India

  • RCH: Reproductive & Child Health (Maternal & Child Health)

  • NPCDCS: Non-Communicable Diseases

  • IDSP: Disease Surveillance

  • NVBDCP: Vector-Borne Diseases

  • NACP: AIDS Control

Primary Health Center (PHC)

  • Covers 30,000 rural / 20,000 tribal population

  • Staff: MO, Pharmacist, Nurse, Lab Tech

  • Services: MCH, Immunization, Disease Control, Health Education

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BIOSTATISTICS

Types of Data

  • Qualitative:

    • Nominal: Blood Group

    • Ordinal: Severity

  • Quantitative:

    • Discrete: Counts

    • Continuous: Weight

Measures of Central Tendency

  • Mean: Sum/N (Affected by extremes)

  • Median: Middle value

  • Mode: Most frequent value

Tests of Significance

  • T-Test: Compare means of 2 groups

  • Chi-Square: Compare categorical data

  • ANOVA: Compare 3 or more means

PREVENTIVE MEDICINE & DISEASE CONTROL

Levels of Prevention

  • Primordial: Prevent risk factors (Policy)

  • Primary: Prevent disease onset (Vaccination)

  • Secondary: Early detection (Screening)

  • Tertiary: Reduce complications (Rehabilitation)

Screening Tests

  • Sensitivity: Detects true positives

  • Specificity: Detects true negatives

  • PPV: Probability of disease if test positive

  • NPV: Probability of no disease if test negative

Major Occupational Diseases

  • Silicosis: Mining, Stone Cutting

  • Byssinosis: Cotton Industry

  • Lead Poisoning: Battery Industry

  • Asbestosis: Shipbuilding, Roofing

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ENVIRONMENTAL HEALTH & SANITATION

Sources of Water & Purification

  • Sources:

    • Surface (Rivers)

    • Groundwater (Wells)

  • Purification Methods: Coagulation, Filtration, Chlorination

Safe Drinking Water Parameters

  • pH: 6.5-8.5

  • Hardness: <300 mg/L

  • Fluoride: 0.7-1.2 mg/L

  • Turbidity: <5 NTU

Air Pollution & Health Effects

  • CO: Carboxyhemoglobin formation (Headache, Death)

  • SO2: Acid Rain, Respiratory Issues

  • PM2.5 & PM10: Lung Cancer, Asthma

Solid Waste Disposal Methods

  • Sanitary Landfill: Best method

  • Composting: Organic waste management

  • Incineration: Biomedical waste

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NUTRITION & HEALTH

Macronutrients & Micronutrients

  • Carbohydrates: 55-65% of daily intake

  • Proteins: 0.8-1g/kg body weight

  • Fat: 20-30% of diet

  • Iron: 10-15 mg/day (Deficiency → Anemia)

  • Iodine: 150 mcg/day (Deficiency → Goiter)

Nutritional Deficiency Diseases

  • Kwashiorkor: Protein Deficiency

  • Marasmus: Energy Deficiency

  • Scurvy: Vitamin C Deficiency

  • Rickets: Vitamin D Deficiency

BMI Classification

  • Underweight: <18.5

  • Normal: 18.5-24.9

  • Overweight: 25-29.9

  • Obese: ≥30