📋 Key Information Summary
- Cardiovascular disease (CVD) remains the leading cause of death in Australia, responsible for approximately 25% of all deaths and disproportionately affecting Aboriginal and Torres Strait Islander peoples.
- Modifiable risk factors include hypertension, dyslipidaemia, cigarette smoking, diabetes mellitus, obesity, physical inactivity, unhealthy diet, and harmful alcohol consumption.
- Non-modifiable risk factors include age (men ≥45 years, women ≥55 years), male sex, family history of premature CVD, and ethnicity (South Asian, Aboriginal and Torres Strait Islander).
- The Australian Cardiovascular Risk Calculator (derived from the Framingham Risk Equation) is recommended by the National Vascular Disease Prevention Alliance (NVDPA) to estimate 5-year absolute CVD risk for asymptomatic adults aged 45–74 years.
- All Aboriginal and Torres Strait Islander adults should have cardiovascular risk assessment from age 18 years (RACGP/NVDPA recommendation).
- Absolute CVD risk is categorised as low (<5%), moderate (5–<10%), or high (≥10% or clinically determined high risk) over 5 years.
- Clinically determined high-risk conditions include established atherosclerotic CVD, diabetes mellitus aged ≥65 years or with microalbuminuria, moderate-to-severe chronic kidney disease (eGFR <45 mL/min/1.73 m²), familial hypercholesterolaemia, and systolic BP ≥180 mmHg or diastolic BP ≥110 mmHg.
- Lifestyle modification — including smoking cessation, regular physical activity (≥150 min/week moderate-intensity), heart-healthy diet, weight management, and alcohol reduction — is the foundation of CVD prevention at every risk level.
- Pharmacological management includes antihypertensive therapy (target <130/80 mmHg for high-risk patients), lipid-lowering therapy with statins (first-line), antiplatelet therapy (aspirin for secondary prevention only), and glycaemic control for diabetic patients.
- Aspirin is not recommended for primary prevention of CVD in the general population due to bleeding risk outweighing benefit; it is reserved for secondary prevention.
- Secondary prevention following acute coronary syndrome (ACS) or revascularisation requires lifelong risk-factor modification plus dual antiplatelet therapy (DAPT) for 6–12 months, high-intensity statin, beta-blocker, and ACE inhibitor/ARB.
- GPs play a central role in opportunistic risk assessment, prescribing preventive medications, coordinating chronic disease management plans (MBS Item 721/723), and facilitating referral to cardiac rehabilitation.
Introduction & Australian Epidemiology
Cardiovascular disease (CVD) encompasses a broad spectrum of conditions affecting the heart and blood vessels, including coronary heart disease (CHD), stroke, peripheral arterial disease, rheumatic heart disease, and heart failure. CVD is the leading cause of death in Australia and a major driver of morbidity, disability, and healthcare expenditure. General practitioners are ideally placed to identify at-risk individuals, implement evidence-based preventive strategies, and coordinate long-term management for those living with established disease.
According to the Australian Institute of Health and Welfare (AIHW), an estimated 1.2 million Australians aged 18 years and over have one or more heart, stroke, or vascular conditions. In 2021, CVD accounted for approximately 42,900 deaths (25% of all deaths), with coronary heart disease and stroke being the principal contributors. Although age-standardised CVD mortality has declined significantly over the past four decades due to improvements in acute care and risk-factor reduction, the absolute burden is rising as the population ages and the prevalence of obesity, diabetes, and physical inactivity increases.
The burden of CVD is not distributed equally. Aboriginal and Torres Strait Islander peoples experience CVD mortality rates approximately 1.5–2 times those of non-Indigenous Australians, with even greater disparities in remote and very remote areas. Socioeconomic disadvantage, limited access to primary care, higher prevalence of smoking, diabetes, and chronic kidney disease, and lower rates of medication adherence all contribute to this disparity. People from South Asian, Middle Eastern, and Pacific Islander backgrounds also carry a higher baseline cardiovascular risk, which is not always captured by standard risk calculators.
The total cost of CVD to the Australian health system exceeds billion annually, making it the most expensive disease group. Effective primary and secondary prevention in general practice represents one of the highest-value interventions available in the Australian healthcare system. The National Vascular Disease Prevention Alliance (NVDPA), the Royal Australian College of General Practitioners (RACGP), and the National Heart Foundation of Australia (NHF) have collaborated to produce the Australian Cardiovascular Disease Risk Calculator and accompanying clinical guidelines to support evidence-based, systematic risk assessment in primary care.
Risk Factors for CVD
Cardiovascular risk factors are traditionally divided into modifiable and non-modifiable categories. Understanding and systematically addressing these factors is essential for effective prevention. Importantly, risk factors tend to cluster and interact multiplicatively rather than additively — a patient with three moderate risk factors may be at substantially higher risk than a patient with a single severe risk factor.
Non-Modifiable Risk Factors
| Risk Factor | Details | Clinical Implication |
|---|---|---|
| Age | Men ≥45 years; Women ≥55 years (or post-menopausal) | Threshold for CV risk assessment in NVDPA guidelines |
| Male sex | Higher risk at younger ages; women's risk increases post-menopause | Women with premature menopause (<40 years) have elevated risk |
| Family history | First-degree relative with premature CVD (<55 years in men, <65 years in women) | May warrant earlier screening; consider familial hypercholesterolaemia |
| Ethnicity | Aboriginal and Torres Strait Islander, South Asian, Pacific Islander, Middle Eastern | Earlier and more intensive risk-factor screening; lower treatment thresholds |
Modifiable Risk Factors
Hypertension
Hypertension is the single greatest population-attributable risk factor for CVD in Australia. Approximately 6 million Australians aged 18 years and over have measured hypertension (≥140/90 mmHg), though many remain undiagnosed. Office blood pressure should be confirmed with ambulatory blood pressure monitoring (ABPM, MBS Item 11610) or home blood pressure monitoring (HBPM) before initiating treatment, as white-coat hypertension affects 10–15% of the population. Stage 1 hypertension (systolic 140–159 / diastolic 90–99 mmHg) in a low-risk patient may be managed with lifestyle modification alone for 3–6 months, while stage 2 (≥160/100 mmHg) or high-risk patients should commence pharmacotherapy promptly.
Dyslipidaemia
Elevated low-density lipoprotein cholesterol (LDL-C) is a causative factor in atherosclerosis. In Australia, approximately 7.0 million adults have abnormal lipid levels. Fasting lipid profile (total cholesterol, LDL-C, HDL-C, triglycerides) is recommended as part of cardiovascular risk assessment. Remnant cholesterol and lipoprotein(a) [Lp(a)] are emerging risk enhancers that may refine risk estimation, particularly in patients with a family history of premature CVD or an unexpectedly elevated LDL-C.
Cigarette Smoking
Smoking doubles to quadruples CVD risk and is the most preventable cause of cardiovascular death in Australia. While smoking rates have declined nationally (11% of adults in 2022), rates remain disproportionately high among Aboriginal and Torres Strait Islander peoples (approximately 36%) and in lower socioeconomic groups. Even light smoking (1–5 cigarettes/day) significantly increases risk; there is no safe level of exposure. Second-hand smoke exposure also contributes to cardiovascular risk.
Diabetes Mellitus
Type 2 diabetes mellitus (T2DM) confers a 2–4-fold increase in CVD risk. Cardiovascular events are the leading cause of death in people with diabetes. Risk is further amplified by co-existent hypertension, dyslipidaemia, obesity, and microalbuminuria. Newer glucose-lowering agents — particularly sodium-glucose co-transporter-2 (SGLT2) inhibitors and glucagon-like peptide-1 receptor agonists (GLP-1 RAs) — have demonstrated cardiovascular benefit independent of glycaemic lowering and are now recommended as part of integrated cardiometabolic management.
Obesity and Physical Inactivity
Obesity (BMI ≥30 kg/m²) and physical inactivity are independent CVD risk factors that also contribute to hypertension, dyslipidaemia, insulin resistance, and systemic inflammation. Waist circumference (>94 cm in men, >80 cm in women for increased risk; >102 cm in men, >88 cm in women for substantially increased risk) is a practical measure of central adiposity. Less than one in four Australian adults meets the physical activity guidelines of ≥150 minutes of moderate-intensity or ≥75 minutes of vigorous-intensity activity per week.
Other Modifiable Factors
- Chronic kidney disease (CKD): eGFR <60 mL/min/1.73 m² or albumin-creatinine ratio (ACR) ≥3 mg/mmol independently increases CVD risk; CKD is classified as a clinically determined high-risk condition when eGFR <45.
- Atrial fibrillation: Independent risk factor for stroke; requires CHA₂DS₂-VASc scoring and anticoagulation assessment.
- Sleep apnoea: Obstructive sleep apnoea is associated with resistant hypertension and increased CVD risk.
- Psychosocial factors: Depression, social isolation, chronic stress, and low socioeconomic status are recognised CVD risk modifiers (NHMRC level B evidence).
- Alcohol: Heavy alcohol consumption (>14 standard drinks/week) increases blood pressure, triglycerides, and risk of cardiomyopathy; no level of alcohol consumption is cardioprotective.
Absolute Cardiovascular Risk Assessment
Absolute cardiovascular risk (CVR) assessment estimates the probability of a cardiovascular event (myocardial infarction, stroke, or cardiovascular death) occurring within a defined time period, typically 5 years. This approach is superior to treating individual risk factors in isolation because it accounts for the synergistic effect of multiple co-existing risk factors. The National Vascular Disease Prevention Alliance (NVDPA) recommends the use of the Australian Cardiovascular Risk Calculator for all asymptomatic adults aged 45–74 years (and from 18 years for Aboriginal and Torres Strait Islander peoples).
When to Assess
- All adults aged 45–74 years (≥30 years for Aboriginal and Torres Strait Islander peoples) should have an absolute CVD risk assessment as part of routine preventive care.
- Adults aged 75+ years are generally considered to be at high absolute risk; formal calculation is less useful but risk-factor modification remains essential.
- Assessment should be repeated every 2 years for low-risk individuals, and annually for moderate-risk individuals.
- Patients with new risk factors (e.g., newly diagnosed diabetes, new smoking, significant weight gain) should be reassessed promptly.
- Health assessments under MBS Items 701, 703, 705, 707, 715, and 721/723 provide structured opportunities for CVD risk assessment.
Components of the Australian CVR Calculator
The calculator uses the following variables, derived from the Framingham Heart Study and recalibrated to Australian population data:
| Variable | Details |
|---|---|
| Age | 30–74 years (calculator range) |
| Sex | Male / Female |
| Systolic blood pressure | Office or confirmed measurement (mmHg) |
| Total cholesterol | Fasting lipid (mmol/L) |
| HDL cholesterol | Fasting lipid (mmol/L) |
| Smoking status | Current smoker / Non-smoker / Ex-smoker |
| Diabetes mellitus | Yes / No (type 1 or type 2) |
| Left ventricular hypertrophy (LVH) | ECG-confirmed LVH (optional; adds significant points if present) |
| eGFR | Where available; CKD automatically classifies as high risk if eGFR <45 |
| Family history of premature CVD | First-degree relative, men <55 years, women <65 years |
Risk Categories and Clinical Actions
Clinically Determined High-Risk Conditions
The following conditions automatically classify a patient as high absolute CVD risk, regardless of calculated 5-year score:
- Established atherosclerotic CVD (prior MI, stroke, TIA, peripheral arterial disease, revascularisation)
- Diabetes mellitus with microalbuminuria (ACR ≥3.0 mg/mmol) or aged ≥65 years
- Moderate-to-severe CKD (eGFR <45 mL/min/1.73 m²)
- Systolic BP ≥180 mmHg or diastolic BP ≥110 mmHg
- Total cholesterol >7.5 mmol/L (familial hypercholesterolaemia suspected)
- Aboriginal and Torres Strait Islander peoples aged ≥50 years with any two risk factors
Lifestyle Modification
Lifestyle modification is the cornerstone of both primary and secondary CVD prevention. Evidence consistently demonstrates that healthy lifestyle behaviours can reduce CVD risk by 50–80%, even in the presence of genetic predisposition. GPs should provide brief, targeted lifestyle counselling at every opportunity and refer to allied health professionals, community programmes, and state-based Heart Foundation services where appropriate.
Smoking Cessation
- Brief intervention (3As): Ask about smoking status at every visit; Advise of the health benefits of quitting; Assist with a quit plan and pharmacotherapy.
- Nicotine replacement therapy (NRT): Patches (16-hour or 24-hour), gum, lozenges, inhalers, or nasal spray. Combination NRT (patch + short-acting form) is more effective than monotherapy.
- Varenicline (Champix®): Most effective single-agent pharmacotherapy. 0.5 mg PO daily for 3 days → 0.5 mg PO BD for 4 days → 1 mg PO BD for 11 weeks. Total course 12 weeks; may repeat once. ✔ PBS General Benefit
- Bupropion (Zyban®): 150 mg PO BD for 7–9 weeks. Alternative when varenicline contraindicated. ✔ PBS General Benefit
- Referral: Quitline 13 7848 (free telephone coaching); QuitCoach (online); Aboriginal Quitline 13 7848 (culturally appropriate service).
Physical Activity
- Target: ≥150 minutes of moderate-intensity or ≥75 minutes of vigorous-intensity aerobic activity per week, plus resistance training ≥2 days per week.
- Cardiac rehabilitation: Referral to an accredited cardiac rehabilitation programme (MBS Item 699 — pending) is recommended for all patients following an acute cardiac event. Programmes typically run 6–8 weeks and include supervised exercise, education, and psychosocial support.
- Sedentary behaviour: Prolonged sitting is an independent risk factor. Advise breaking up long sitting periods every 30 minutes with light activity.
- Exercise prescription: Can be provided by GPs under chronic disease management plans (MBS Item 721) with referral to exercise physiologists or physiotherapists.
Diet and Nutrition
The evidence-based dietary pattern with the strongest cardiovascular benefit is the Mediterranean diet, supplemented by principles of the Dietary Approaches to Stop Hypertension (DASH) diet. Key recommendations include:
- ≥5 serves of vegetables and ≥2 serves of fruit daily.
- Wholegrain cereals, legumes, and nuts as staple foods.
- Extra virgin olive oil as the principal added fat.
- Fish (oily fish rich in omega-3 fatty acids) ≥2 times per week.
- Limit processed meats (sausages, bacon, salami), refined carbohydrates, sugar-sweetened beverages, and added salt (target <5 g/day or <2000 mg sodium/day).
- Unflavoured dairy (milk, yoghurt, cheese) preferred over flavoured varieties.
- Refer to an accredited practising dietitian (APD) for individualised counselling, available via MBS Group Allied Health items (MBS Item 10950–10970) under a GP Management Plan.
Weight Management
- Target BMI 18.5–24.9 kg/m²; waist circumference <94 cm (men) or <80 cm (women).
- A modest weight loss of 5–10% of body weight produces clinically meaningful improvements in blood pressure, lipid profile, and glycaemic control.
- Consider referral to the Life! programme (Victoria) or state-equivalent programmes for structured lifestyle intervention.
- Pharmacotherapy for obesity (orlistat, liraglutide 3.0 mg, semaglutide 2.4 mg) may be considered when lifestyle measures alone are insufficient — refer to bariatric medicine guidelines.
Alcohol Reduction
- Follow NHMRC guidelines: no more than 10 standard drinks per week and no more than 4 standard drinks on any one day.
- Advise that for CVD risk reduction, less is better; no level of alcohol consumption is cardioprotective.
- Screen for alcohol use disorder with AUDIT-C; refer to specialist services if dependency suspected.
Psychosocial Wellbeing
- Screen for depression and anxiety using validated tools (PHQ-9, GAD-7). Depression is common after acute cardiac events and independently worsens prognosis.
- Social isolation and chronic stress are independent CVD risk factors. Encourage social connectedness and stress-reduction strategies.
- Mental Health Treatment Plans (MBS Item 2710/2712) enable referral to psychologists for evidence-based therapy.
Secondary Prevention of CHD
Secondary prevention aims to reduce the risk of recurrent cardiovascular events in patients with established atherosclerotic CVD (coronary heart disease, ischaemic stroke, transient ischaemic attack, peripheral arterial disease). Patients with established CVD are classified as automatically high risk and require lifelong, comprehensive risk-factor management. Evidence demonstrates that systematic secondary prevention reduces recurrent events by 20–50% and mortality by 25–40%.
Pharmacological Secondary Prevention
The following medications represent the core pharmacological regimen for secondary prevention of CHD. All should be initiated unless contraindicated or not tolerated.
Quick Reference — Post-ACS Secondary Prevention
Additional Secondary Prevention Measures
- Influenza vaccination: Annual influenza vaccination is recommended for all patients with established CVD (NHMRC Grade A recommendation). Influenza is a recognised trigger for acute MI.
- Blood pressure target: <130/80 mmHg for all patients with established CVD, with individualised targets in the elderly.
- Glycaemic targets: HbA1c ≤53 mmol/mol (7.0%) for most patients with diabetes and CVD. Use SGLT2 inhibitors or GLP-1 RAs with proven cardiovascular benefit (empagliflozin, liraglutide, semaglutide).
- Cardiac rehabilitation: All patients post-ACS or revascularisation should be offered cardiac rehabilitation. Programme completion is associated with a 25–30% reduction in cardiovascular mortality.
- Chronic Disease Management (CDM): Utilise GP Management Plans (MBS Item 721) and Team Care Arrangements (MBS Item 723) to coordinate multidisciplinary care.
- Psychosocial support: Screen for depression (PHQ-9), anxiety, and cardiac-specific distress. Depression post-MI affects 15–20% of patients and independently worsens prognosis.
- Driving restrictions: Patients should be advised not to drive for 2 weeks following uncomplicated MI and 4 weeks following coronary artery bypass grafting (CABG) — per Austroads guidelines.
Special Populations
Aboriginal and Torres Strait Islander Health Considerations
Cardiovascular disease is the leading cause of death among Aboriginal and Torres Strait Islander peoples, accounting for approximately 22% of all deaths. CVD mortality rates are 1.5–2 times higher than those of non-Indigenous Australians, with even greater disparities in remote and very remote communities. The onset of CVD occurs approximately 10–15 years earlier in Aboriginal and Torres Strait Islander peoples, and the burden of risk factors — including smoking, diabetes, obesity, chronic kidney disease, rheumatic heart disease, and socioeconomic disadvantage — is substantially higher.
Importantly, the NVDPA and RACGP recommend that cardiovascular risk assessment for Aboriginal and Torres Strait Islander peoples commence from age 18 years (rather than 45 years for the general population), reflecting the earlier onset and higher prevalence of risk factors. All Aboriginal and Torres Strait Islander adults should have an annual health check (MBS Item 715 — Indigenous Health Assessment), which includes cardiovascular risk assessment, blood pressure measurement, lipid profile, blood glucose or HbA1c, renal function, and ACR.
📚 References
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- 2. Royal Australian College of General Practitioners (RACGP). Guidelines for Preventive Activities in General Practice (Red Book). 9th edn. Melbourne: RACGP; 2016.
- 3. Australian Institute of Health and Welfare (AIHW). Heart, Stroke and Vascular Disease — Australian Facts. AIHW Cat. No. CVD 87. Canberra: AIHW; 2023.
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