Disease Prevention Framework

🟢 Lite — Quick Review (1h–1d)

Rapid summary for last-minute revision before your exam.

Topic 4 is the chronic-and-acute disease management core of Saudi GP Board Family Medicine. The general practitioner acts as gatekeeper and continuity-of-care provider across diabetes, hypertension, asthma, COPD, dyslipidaemia, obesity, thyroid disease, and common mental health conditions. Must-know calculations:

BMI = weight (kg) ÷ height² (m²); obesity ≥ 30 kg/m², overweight 25–29.9.
MAP = (SBP + 2 × DBP) ÷ 3; target ≥ 65 mmHg in sepsis.
LDL-C (Friedewald) = TC − HDL − (TG/5); valid only when TG < 4.5 mmol/L.
HbA1c → eAG (mg/dL) = 28.7 × HbA1c − 46.7.
Corrected calcium (mg/dL) = measured Ca + 0.8 × (4.0 − albumin).

Exam pointers: (1) Diagnose T2DM with HbA1c ≥ 6.5% confirmed on repeat testing in asymptomatic patients. (2) Initiate metformin first-line for T2DM; ACEi/ARB for hypertension with diabetes or proteinuria. (3) Asthma controller = ICS; reliever = SABA. (4) Use SCORE2/SCORE2-OP for CV risk stratification before prescribing statins.

🟡 Standard — Regular Study (2d–2mo)

Standard content for students with a few days to months.

Disease Prevention Framework

Saudi MoH primary care practice operates on three prevention levels: primary (vaccination, smoking cessation, obesity counselling), secondary (screening for DM, hypertension, breast/colorectal/cervical cancer using age- and sex-specific Saudi/WHO criteria), and tertiary (preventing complications in established DM, CKD, CAD). The periodic health examination is planned per risk profile, not as a uniform annual battery. The Chronic Care Model integrates self-management support, delivery-system redesign, decision support, clinical information systems, community resources, and health-system organisation.

Cardiovascular Risk and Lipids

Use SCORE2 (40–69 y) or SCORE2-OP (≥70 y) calibrated for European populations; Saudi practice adapts thresholds given high local CVD burden. Initiate moderate-intensity statin when 10-year risk ≥ 5% (low-risk country baseline) or 10% (high-risk), escalating to high-intensity for risk ≥ 10% or established ASCVD/DM with target organ damage. Friedewald underestimates LDL when TG ≥ 4.5 mmol/L — switch to direct LDL measurement.

Common Endocrine and Renal Numbers

Parameter	Formula / Threshold
T2DM diagnosis	HbA1c ≥ 6.5% (repeat), FPG ≥ 7.0 mmol/L, or 2-h OGTT ≥ 11.1 mmol/L
CKD-EPI eGFR	141 × min(Scr/κ,1)^a × max(Scr/κ,1)^(−1.209) × 0.993^age × sex factor
MAP	(SBP + 2·DBP)/3 — used in septic shock targeting
Corrected Ca	Measured Ca + 0.8 × (4.0 − albumin)

Respiratory Stepwise Therapy

GINA asthma stepwise: Step 1–2 low-dose ICS-formoterol as needed; Step 3 low-dose ICS-LABA; Step 4 medium-dose ICS-LABA; Step 5 high-dose + biologics. GOLD COPD: classify by symptoms (mMRC/CAT) + risk (exacerbations), then escalate from short-acting bronchodilators to LAMA ± LABA ± ICS for eosinophilic phenotype.

Behavioural Change

The 5 A’s (Ask, Advise, Assess, Assist, Arrange) structure every smoking-cessation and weight-management encounter. PHQ-9 ≥ 10 = moderate depression warranting therapy; GAD-7 ≥ 10 = moderate anxiety. Apply shared decision making with cultural alignment to Saudi family-centred contexts.

🔴 Extended — Deep Study (3mo+)

Comprehensive coverage for students on a longer study timeline.

Edge Cases and Diagnostic Traps

A single HbA1c ≥ 6.5% in an asymptomatic patient requires confirmatory repeat because haemoglobinopathies (sickle trait, thalassaemia — regionally relevant), recent transfusion, and iron-deficiency anaemia distort glycation. Pre-hypertension (120–139 / 80–89 mmHg) is not a pharmacological indication; reserve lifestyle modification (DASH, sodium <2 g/day, 150 min/week activity, weight loss 5–10%) unless diabetes, CKD, or high SCORE coexists. Avoid diagnosing pre-diabetes as diabetes, and avoid initiating antihypertensives on a single elevated reading — confirm with home BP monitoring or 24-h ABPM.

Common Mistakes in Practice

Applying Friedewald at TG ≥ 4.5 mmol/L produces falsely low LDL — directly measure.
Prescribing high-dose ICS as initial asthma therapy instead of low-dose step-up.
Using beta-blockers in asthmatic patients or as first-line monotherapy in uncomplicated hypertension.
Initiating statins in pregnancy or duplicating therapy with fibrates without checking renal function.
Treating viral URTI with antibiotics — apply antimicrobial stewardship (delayed prescribing, Centor criteria, watchful waiting).
Missing red flags: thunderclap headache, chest pain with diaphoresis or radiation, dyspnoea at rest, unilateral leg swelling — refer same-day.

Connections Across the Curriculum

Topic 4 integrates with Topic 1 (preventive medicine and screening), Topic 2 (consultation models and breaking bad news), and Topic 5 (rational prescribing and stewardship). Cardiovascular decisions link to Topic 3 (evidence-based medicine — interpreting NNT for statins and BP targets). Saudi-specific cultural competency shapes counselling for Ramadan fasting with diabetes (ICAFR/IDF guidelines risk stratify patients) and obesity in adolescents (BMI-for-age Saudi growth charts).

Worked Micro-Example

A 58-year-old Saudi man, BMI 31, BP 152/96, TC 6.4 mmol/L, HDL 1.0, TG 2.2, FPG 7.8, HbA1c 7.1%. LDL = 6.4 − 1.0 − (2.2/5) = 4.96 mmol/L. MAP = (152 + 2·96)/3 = 114.7 mmHg. Diagnosis: T2DM (confirmed on repeat), stage-2 hypertension, obesity, high LDL. Plan: metformin 500 mg bid titrated, ACEi, moderate-to-high-intensity statin, 5 A’s for weight, SCORE2 risk-driven intensification.

Practice Prompts

A 47-year-old woman with TG 5.2 mmol/L requests her LDL result. Explain why Friedewald is invalid here and what alternative you would request.
A 35-year-old man with BP 135/85, no comorbidities, BMI 27 — pharmacologically treat or not? Justify using SCORE2 and Saudi guidance.

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Disease Prevention Framework