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Atrial fibrillation (AF)

Atrial Fibrillation (AF) is the most common heart rhythm disturbance encountered by doctors. AF affects about 10% of elderly patients aged over 65 and the risk increases as people get older. 1AF happens when abnormal electrical impulses suddenly start firing in the atria. As a result, the atria no longer beat in an organised way. This causes you to have a highly irregular pulse rate.2

 

 

Why AF increases your risk of stroke?

In atrial fibrillation, the irregular blood flow through your heart cause blood in your heart's upper chambers (atria) to pool and form clot. If a blood clot forms, it could dislodge from your heart and travel to your brain and stuck in the blood vessels stopping the oxygen supply to your brain, resulting in stroke (see below).3 Study have shown that there was a 5-fold increase in the risk of stroke in the population with atrial fibrillation. 4


心房顫動

心房顫動(又名房顫)是臨床上最常見的心律不正疾病。大概一成65歲以上長者患有心房顫動,而風險則隨年齡而增加。1心房顫動患者由於心房出現不正常的電流,導致快速且不規律的收縮,令到心跳又快又亂2

 

 

心房顫動如何引致中風 ?

心房顫動患者病發時, 因為心房不能正常跳動及有效地將血液泵出心房,令血液凝結成血塊,若血塊流入並堵塞腦血管,便有機會形成缺血性中風 (如下圖)。3有研究指出心房顫動患者的中風風險比一般人高五倍4


References

1. What is Atrial Fibrillation? Heart Rhythm Alliance. Available at: https://www.heartrhythmalliance.org/afa/uk/atrial-fibrillation Last accessed: Feb 2020

 

2. NHS choices Atrial Fibrillation. Available at https://www.nhs.uk/conditions/atrial-fibrillation/ Last accessed: Jan 2020

 

3. Mayo Clinic Atrial Fibrillation. Available at : https://www.mayoclinic.org/diseases-conditions/atrial-fibrillation/symptoms-causes/syc-20350624 Last accessed: Feb 2020

 

4.Rasekh A et al. Tex Heart Inst J. 2005; 32(2): 218-219

 

Disease Information

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