Give a diagramatic or interpreted overview of Prevention of CHD accord

Give a diagramatic or interpreted overview of Prevention of CHD according to Park's Preventive medicine book

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A detailed medical educational diagram titled "Prevention of Coronary Heart Disease (CHD) — Park's Framework" showing four levels of prevention arranged vertically: Primordial Prevention, Primary Prevention, Secondary Prevention, and Tertiary Prevention. Each level has its own color-coded box with bullet points listing specific measures. Include risk factors section showing modifiable (hypertension, smoking, hyperlipidemia, diabetes, obesity, physical inactivity, stress) and non-modifiable (age, sex, family history, genetics). Use arrows and clean flowchart style. Professional medical textbook diagram aesthetic with clear hierarchy and readable text.

Prevention of Coronary Heart Disease (CHD) — Park's Framework

Park's Textbook of Preventive and Social Medicine approaches CHD prevention using the natural history of disease model, intercepting at multiple levels across the disease continuum. CHD prevention is organized into 4 levels, preceded by identification of risk factors.

Risk Factors for CHD

Non-Modifiable

Factor	Details
Age	Risk rises after 45 (men), 55 (women)
Sex	Males at higher risk; women's risk rises post-menopause
Family history	First-degree relatives with premature CHD
Genetic factors	Familial hypercholesterolaemia, etc.

Modifiable (Major)

Factor	Target
Hypertension	BP < 130/80 mmHg
Hyperlipidaemia	LDL-C reduction; total cholesterol < 200 mg/dL
Cigarette smoking	Complete cessation
Diabetes mellitus	HbA1c < 7%; glycaemic control
Obesity	BMI 18.5–24.9; waist < 90 cm (M), < 80 cm (F)
Physical inactivity	≥150 min/week moderate activity
Psychosocial stress	Type A behaviour, depression

Modifiable (Minor/Emerging)

Hypertriglyceridaemia, Low HDL, Homocysteinaemia, CRP elevation, Fibrinogen, Lipoprotein(a), Oral contraceptive use

The Four Levels of Prevention

🔵 Primordial Prevention

Targets the pre-risk stage — preventing the emergence of risk factors themselves in the population

Target group: Entire healthy population, especially children & youth

Measures:

National/Community level policies: food labelling, salt reduction in processed foods, tobacco control legislation (FCTC), trans-fat bans
Health education: promotion of healthy diet, physical activity, non-smoking habits from childhood
School-based programmes: nutrition education, physical fitness curricula
Urban planning: creating environments conducive to walking, cycling
Social/economic development to reduce poverty and improve living standards

Concept: Prevention is directed at social, environmental, and economic conditions that allow risk factors to arise — not at the individual risk factors themselves.

🟢 Primary Prevention

Targets individuals at risk (risk factors present, no disease yet) — preventing CHD from ever occurring

Target group: Individuals with identified risk factors

Measures:

A. Health Promotion

Health education about CHD risk factors
Promote balanced diet low in saturated fats, trans fats, salt, and refined sugars
Encourage regular aerobic exercise (brisk walking, cycling, swimming)
Weight management & avoidance of central obesity
Stress management; work–life balance

B. Specific Protection

Anti-tobacco programmes; smoking cessation support (NRT, counselling)
Control of hypertension (lifestyle + pharmacotherapy where indicated)
Control of hyperlipidaemia (statins in high-risk individuals, diet)
Glycaemic control in diabetes
Aspirin in selected high-risk individuals (as per guidelines)
Screening and referral programmes for risk factor detection

Key principle: Even a modest reduction in population-wide risk factor levels produces large absolute reductions in CHD incidence (Rose's strategy).

🟡 Secondary Prevention

Targets those with established CHD — halting progression, preventing recurrence and complications

Target group: Patients with angina, post-MI, post-revascularisation

Measures:

A. Early Diagnosis

ECG, stress testing, coronary angiography
Screening of high-risk asymptomatic individuals

B. Prompt Treatment

Thrombolysis/primary PTCA/CABG for acute MI
Antiplatelet therapy (aspirin + clopidogrel)
Beta-blockers (post-MI cardioprotection)
ACE inhibitors/ARBs (post-MI, HF with reduced EF)
High-intensity statins (LDL-C ≥ 50% reduction)
Nitrates for angina
Rehabilitation post-MI

C. Disability Limitation

Prevent heart failure progression
Prevent arrhythmias (ICD implantation where indicated)
Prevent re-infarction through strict risk factor control

🔴 Tertiary Prevention

Targets those with severe/complicated CHD — restoring maximal function and preventing further disability

Target group: Post-MI patients with heart failure, disability, or post-revascularisation

Measures:

A. Rehabilitation

Cardiac rehabilitation programme (Phase I–III):
- Phase I: In-hospital mobilisation
- Phase II: Supervised outpatient exercise
- Phase III: Long-term community maintenance
Psychosocial rehabilitation; management of depression and anxiety
Vocational rehabilitation — return to work

B. Prevention of Recurrence

Continued pharmacotherapy adherence (statins, antiplatelets, beta-blockers, ACEi)
Lifestyle modification reinforcement
Regular follow-up and monitoring

C. Palliative / End-Stage Care

Management of end-stage heart failure (diuretics, device therapy, transplant evaluation)
Palliative care for irreversible cardiac disability

Summary Diagram (Textual)

NATURAL HISTORY OF CHD
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
  No risk       Risk factors     Subclinical     Clinical     Complications
  factors       emerging         CHD             CHD          / Death
     │               │               │               │              │
     ▼               ▼               ▼               ▼              ▼
┌──────────┐  ┌───────────┐  ┌───────────┐  ┌────────────┐  ┌──────────┐
│PRIMORDIAL│  │  PRIMARY  │  │ SECONDARY │  │ SECONDARY  │  │TERTIARY  │
│Prevention│  │Prevention │  │Prevention │  │Prevention  │  │Prevention│
│(pop-level│  │(risk factor│  │(early Dx &│  │(treatment) │  │(rehab &  │
│ policies)│  │ control)  │  │ screening)│  │            │  │ palliate)│
└──────────┘  └───────────┘  └───────────┘  └────────────┘  └──────────┘
     ↑               ↑               ↑               ↑              ↑
 Leavell &     Leavell &        Leavell &       Leavell &      Leavell &
 Clark Level  Clark Level 1    Clark Level 2   Clark Level 3  Clark Level 4/5
   (added      (Health         (Early diag.    (Treatment     (Rehab)
  by WHO)      Promo +          + Rx)            + Disab.
               Specific                          limit.)
               Protection)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Key Park's Concepts in CHD Prevention

Concept	Relevance
Leavell & Clark's levels	5 levels mapped to natural history of disease
Primordial prevention	Added specifically for NCDs like CHD by WHO/Park
Rose's Population Strategy	Small shift in population BP/cholesterol = large CHD reduction
High-Risk Strategy	Target intensive prevention at those with most risk
Epidemiological triad	Host (genetics, age) + Agent (atherogenic factors) + Environment (diet, stress, smoking culture)
Web of causation	CHD is multi-factorial; no single cause — prevention must be multi-pronged

Note: Park's Textbook of Preventive and Social Medicine (24th ed.) places CHD prevention within the broader framework of non-communicable disease (NCD) control, emphasising that primordial prevention — absent from earlier Leavell & Clark schemas — is the most impactful level for population-wide CHD burden reduction, as it prevents the very emergence of risk factors.

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