A recent study has sparked a debate about statins, the widely used cholesterol-lowering drugs. While the news is positive for many, it raises two intriguing concerns. Are we underestimating the side effects, or overestimating the benefits?
The Lancet study, involving 124,000 participants over 4.5 years, suggests that fears of side effects like memory loss and sleep disturbances are exaggerated. This aligns with previous research indicating that statins are better tolerated than commonly believed. But here's where it gets controversial: the study's implications go beyond side effects.
In the UK, 10 million people take statins daily, either to prevent a first heart attack or stroke (primary prevention) or to reduce the risk of recurrence (secondary prevention). I, like many others, fall into the former category, taking atorvastatin without noticeable side effects beyond vivid dreams, which the study dismisses as unrelated.
The real concern lies in patients' perceptions. Many view statins as a replacement for a healthy lifestyle rather than a supplement. Statins not only lower cholesterol but also stabilize arterial 'furring,' including in the brain and other organs. This is crucial, as we develop arterial deposits with age, which can lead to vessel narrowing or ruptures causing catastrophic blockages.
I prefer to call statins 'risk-reducers' rather than just cholesterol-lowering drugs. Their effectiveness varies with the individual's risk profile. A 25% risk reduction is significant for high-risk groups like stroke or heart attack survivors, but for low-risk individuals, the real-world benefits are negligible.
The QRisk calculator assesses the 10-year risk of stroke or heart attack. Those with a history of these events are automatically considered high-risk and prescribed statins. For others, it depends on their QRisk score. GPs often offer statins to those with a 10% or higher risk, sometimes even at 5% if they're proactive.
The 10% threshold is significant, as most people reach it by their sixties. Nice estimates that 40 strokes or heart attacks can be prevented for every 1,000 people taking statins for a decade. However, this leaves 960 people who didn't benefit, either because they didn't need the drug or because it didn't work for them.
The 'number needed to treat' (NNT) website researchers estimate that in primary prevention, 200 people need to take statins for five years to prevent one heart attack, and 300 to prevent one stroke. In secondary prevention, these figures drop to 40 and 125, respectively.
Interestingly, the same researchers suggest that a Mediterranean diet might be more effective than statins for primary prevention, with one heart attack prevented for every 63 people over five years, and one in 18 for secondary prevention. But why not combine a healthy diet with medication?
If you're committed to reducing cardiovascular disease risk, consider statins if recommended, but don't rely on them alone. Healthy eating, not smoking, maintaining an active lifestyle, and monitoring blood pressure remain crucial. In fact, they might be even more essential.
To calculate your risk, try the QRisk-3 tool, designed for use with a healthcare professional but accessible at home. It requires data like blood pressure, height, weight, cholesterol levels, and family history, but you can leave fields blank for average estimates. Remember, the result is a general prediction and doesn't account for all risk factors. If your estimated heart age is significantly older than your actual age, it's time to address modifiable factors like smoking, blood pressure, weight, and cholesterol.
