You're Doing Everything Right. So Why Is Your Heart Risk Still High?
Gym. Diet. Steps. Normal cholesterol. Still not bulletproof. Every year, people who appear to be doing everything right still have heart attacks — and the uncomfortable truth is that heart disease is not always caused by the obvious risk factors.
The Heart Attack That "Shouldn't" Have Happened
For decades, medicine has focused on four major risk factors: high blood pressure, high cholesterol, diabetes, and smoking. They matter enormously. But the absence of these risk factors does not mean the absence of risk.
Cardiologists call this SMuRFless coronary artery disease — heart disease in people who do not have the usual suspects. And it is more common than most people realise.
27%
No Standard Risk Factors
of STEMI (major heart attack) patients at a major Sydney hospital had none of the four standard risk factors — up from 11% in 2006
23%
National Trend
of heart attack patients in the Australian national registry had no standard modifiable risk factors — rising from 14% in 1999 to 23% in 2017
62K+
SWEDEHEART Study
STEMI patients analysed in the Swedish national cardiac registry, confirming the global scope of SMuRFless heart disease
"Normal Cholesterol" Does Not Always Mean "Low Risk"
A standard cholesterol test measures the amount of cholesterol carried inside LDL particles — but it does not always reveal how many artery-damaging particles are actually circulating in your blood. That distinction is critical.
Standard LDL Cholesterol
Measures the total cholesterol content inside LDL particles. Two people with identical LDL readings can have vastly different numbers of circulating particles — and therefore very different levels of arterial risk.
ApoB: The Particle Count
ApoB is a protein on the surface of every major plaque-forming particle — LDL, VLDL, and lipoprotein(a). Each particle carries exactly one ApoB molecule, giving a direct count of atherogenic particles in the blood. More particles means more opportunities to enter the artery wall and build plaque.
The 2026 ACC/AHA Dyslipidaemia Guidelines found that when LDL and ApoB are assessed together, only ApoB remains a significant independent predictor of heart attack (adjusted hazard ratio 1.27 per standard deviation).
The Blood Test Most Australians Have Never Had
Lp(a) is one of the most important inherited risk factors for heart disease — and one of the most under-recognised. Unlike LDL, your Lp(a) level is overwhelmingly determined by genetics, not lifestyle. You do not get high Lp(a) from eating badly. You do not lower it with diet, exercise, or most medications. You inherit it.
That is why someone can be lean, active, and disciplined — and still carry a significantly elevated Lp(a) level without knowing it.
≥125 nmol/L (50 mg/dL)
~1.4-fold increased ASCVD risk. Affects approximately 1 in 5 people globally.
≥250 nmol/L (100 mg/dL)
~2-fold increased cardiovascular risk. Warrants intensified management of all other modifiable risk factors.
≥430 nmol/L (180 mg/dL)
~4-fold increased risk — considered equivalent to heterozygous familial hypercholesterolaemia, a serious inherited condition.
Lp(a) in Australia: What You Need to Know
In Australia, Lp(a) is not part of the routine cholesterol panel and is not currently covered by Medicare as a standard screening test. Patients may need to request it specifically and pay out of pocket — though the cost is generally modest.
Who Should Consider Testing
Family history of premature heart disease or stroke
Unexplained coronary artery disease
Heart event that seemed to come "out of nowhere"
High cholesterol that does not respond as expected to treatment
First-degree relatives with known elevated Lp(a)
What Happens If It's Elevated?
There are currently no approved therapies specifically targeting Lp(a), though several advanced clinical trials are underway — including mRNA therapies and oral small-molecule inhibitors. PCSK9 inhibitors lower Lp(a) by approximately 15–30%, though they are not approved specifically for this purpose.
The clinical response is to intensify management of all other modifiable risk factors — particularly aggressive LDL lowering. Importantly, lifestyle changes aligned with healthy behaviours are associated with a 67% lower risk of cardiovascular events even among people with elevated Lp(a).
Family History Is Not Small Talk
Patients often mention family history in passing — a father's heart attack, a brother's stents, a mother's bypass surgery. These details are not background noise. They are major risk signals that can fundamentally change how your personal risk should be interpreted.
Male First-Degree Relative
Heart disease before age 55 in a father, brother, or son is considered premature coronary disease — a significant inherited risk signal.
Female First-Degree Relative
Heart disease before age 65 in a mother, sister, or daughter warrants closer scrutiny of your own risk profile, even if your numbers look normal.
Cascade Testing
If Lp(a) is found to be elevated, testing of first-degree family members — parents, siblings, children — is recommended, particularly with a personal or family history of premature cardiovascular disease.
Inflammation: The Risk Factor Hiding in Plain Sight
Cholesterol has long dominated the conversation about coronary disease — and rightly so. But it is not the only story. Chronic low-grade inflammation plays a major role in atherosclerosis, plaque instability, and heart attacks.
The 2025 ACC Scientific Statement on Inflammation and Cardiovascular Disease is unambiguous: the evidence linking inflammation with atherosclerotic cardiovascular disease is "no longer exploratory but is compelling and clinically actionable."
hsCRP: A Window Into Inflammatory Risk
High-sensitivity C-reactive protein (hsCRP) is a blood marker of inflammation. When persistently elevated in a stable patient, it can identify someone carrying higher inflammatory cardiovascular risk:
Above 10 mg/L — may reflect acute infection; retest in 2–3 weeks
What Drives Chronic Inflammation?
Excess visceral (abdominal) fat
Untreated sleep apnoea
Rheumatoid arthritis, lupus, psoriasis, or IBD
Gum disease
Chronic stress and poor sleep
Smoking
Sedentary lifestyle
Air pollution exposure
The Calcium Score: Actually Looking for Plaque
Most risk calculators estimate your chance of a future event. A coronary artery calcium (CAC) score does something fundamentally different — it looks directly for calcified plaque already present in your coronary arteries. Some people are "low risk" on paper but already have plaque. Others classified as "intermediate risk" have no detectable coronary calcium at all.
1
Score: 0 Agatston Units
Reassuring. Could reclassify a person to low absolute cardiovascular risk, potentially deferring medication in borderline cases.
2
Score: 1–99 Agatston Units
Some plaque present. Helps guide shared decision-making about risk management intensity and medication.
3
Score: ≥100 Agatston Units
Could reclassify a person to high absolute cardiovascular risk, supporting more aggressive preventive treatment.
Questions to Ask at Your Next GP Visit
"But I feel fine" is the trap. Coronary plaque can build silently for years with no symptoms. Many heart attacks occur not because an artery slowly narrows, but because a plaque becomes unstable, ruptures, and triggers a sudden blood clot — with no warning beforehand. If you want a more complete picture of your heart risk, ask better questions.
01
"What is my absolute cardiovascular risk?"
In Australia, treatment decisions are guided by absolute cardiovascular risk — not just one number such as cholesterol. Understand where you actually sit.
02
"Should I have Lp(a) checked?"
Especially if there is premature heart disease in the family, unexplained coronary disease, or a heart event that seemed to come out of nowhere. It is a one-off test.
03
"Would ApoB add anything beyond my standard cholesterol test?"
Particularly relevant if you have raised triglycerides, insulin resistance, diabetes, metabolic syndrome, or established coronary disease.
04
"Is inflammation relevant in my case?"
This may include hsCRP, but also exploring causes such as sleep apnoea, autoimmune disease, gum disease, abdominal adiposity, and chronic stress.
05
"Would a coronary calcium score help clarify my risk?"
Only if you are asymptomatic and the result would genuinely change how your risk is managed — not as a general screening tool for everyone.
The Real Message: Look Deeper When Your Story Doesn't Fit
Healthy living matters — enormously. Exercise, good nutrition, not smoking, quality sleep, blood pressure control, and weight management remain the foundation of heart disease prevention. But for some people, they are not the whole answer.
Inherited Risk
Some people carry high Lp(a) or familial hypercholesterolaemia regardless of how well they live. Genetics can override lifestyle.
Hidden Particle Burden
Your LDL can appear acceptable while your ApoB — the true count of atherogenic particles — remains higher than expected.
Inflammatory Risk
Chronic low-grade inflammation from sleep apnoea, autoimmune disease, or visceral fat can silently drive plaque progression.
Family History
Premature heart disease in a first-degree relative is a major risk signal that standard calculators can systematically underestimate.
The most dangerous phrase in prevention is: "You're fine." Sometimes you are. Sometimes you need a more personalised look.