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Stroke Risk: Causes, Factors and Prevention

Stroke risk refers to the likelihood of experiencing a stroke. Key risk factors include high blood pressure, atrial fibrillation, diabetes, and smoking.

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Things worth knowing about "Stroke Risk"

Stroke risk refers to the likelihood of experiencing a stroke. Key risk factors include high blood pressure, atrial fibrillation, diabetes, and smoking.

What Is Stroke Risk?

Stroke risk describes the individual probability of suffering a stroke (also known medically as apoplexy or cerebrovascular accident). A stroke occurs when blood flow to a part of the brain is interrupted -- either due to a blocked blood vessel (ischaemic stroke) or a burst blood vessel causing bleeding in the brain (haemorrhagic stroke). Stroke risk is shaped by a combination of modifiable and non-modifiable factors.

Causes and Risk Factors

Risk factors for stroke are divided into two main categories:

Non-Modifiable Risk Factors

Age: Stroke risk increases significantly with advancing age.
Sex: Men have a higher risk at younger ages, while women face increased risk in older age.
Genetic predisposition: A family history of stroke raises individual risk.
Previous stroke or TIA: A transient ischaemic attack (TIA) is a major warning sign and predictor of future stroke.

Modifiable Risk Factors

Arterial hypertension (high blood pressure): The single most important risk factor for stroke.
Atrial fibrillation: A heart rhythm disorder that can increase stroke risk up to fivefold.
Diabetes mellitus: Elevated blood sugar levels damage blood vessel walls and promote atherosclerosis.
High cholesterol (hypercholesterolaemia): Promotes the build-up of fatty deposits in the arteries.
Smoking: Doubles stroke risk by damaging blood vessels and promoting clot formation.
Obesity and physical inactivity: Indirectly raise stroke risk through associated conditions such as hypertension and diabetes.
Excessive alcohol consumption: Can contribute to high blood pressure and heart arrhythmias.

Assessing Stroke Risk

Doctors use standardised scoring tools to estimate individual stroke risk. The most widely used is the CHA2DS2-VASc score, specifically applied to patients with atrial fibrillation. It evaluates factors including heart failure, hypertension, age, diabetes, previous stroke, vascular disease, and sex. The ABCD2 score is another tool used to assess short-term stroke risk following a TIA.

Diagnosis and Screening

Stroke risk assessment typically takes place during a medical consultation and may include:

Blood pressure and blood glucose measurement
Blood tests including lipid profile
ECG to detect arrhythmias such as atrial fibrillation
Carotid artery ultrasound (duplex sonography) to identify narrowing of the vessels
Lifestyle assessment (smoking status, diet, physical activity)

Prevention and Risk Reduction

Many stroke risk factors can be effectively addressed through targeted interventions. Consistent preventive measures can substantially lower the risk of stroke:

Medical Treatments

Antihypertensive medications: Significantly reduce stroke risk by lowering blood pressure.
Anticoagulants (blood thinners): Used in patients with atrial fibrillation to prevent blood clots from forming.
Statins: Lower cholesterol levels and help protect the arterial walls.
Antiplatelet agents (e.g., aspirin): Reduce the tendency of blood platelets to clump together and form clots.

Lifestyle Modifications

Regular physical activity (at least 150 minutes of moderate exercise per week)
A balanced, low-sodium diet (Mediterranean-style diet is recommended)
Quitting smoking and limiting alcohol intake
Weight loss in cases of obesity
Regular medical check-ups and monitoring

When to Seek Medical Help

The following warning signs may indicate an acute stroke and require immediate emergency action (call 999 or your local emergency number):

Sudden weakness or numbness in the face, arm, or leg, especially on one side
Sudden difficulty speaking or understanding speech
Sudden vision problems in one or both eyes
Sudden severe headache with no known cause
Sudden dizziness, loss of balance, or coordination problems

Even if symptoms resolve quickly (as in a TIA), medical attention must be sought immediately, as the risk of a full stroke is highest in the days following a TIA.

References

World Health Organization (WHO) -- Cardiovascular diseases: Stroke prevention and care. who.int
Kernan WN et al. -- Guidelines for the Prevention of Stroke in Patients With Stroke and Transient Ischemic Attack. Stroke, American Heart Association / American Stroke Association (2021).
Feigin VL et al. -- Global, regional, and national burden of stroke, 1990-2016: a systematic analysis for the Global Burden of Disease Study 2016. The Lancet Neurology (2019).

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