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  • Atrial fibrillation is the most common type of cardiac arrhythmia.

    心房顫動是心律不整類型當中最常見的。

  • In a healthy heart, the sinoatrial nodeor SA nodeinitiates all electrical impulses in the atria.

    在健康的心臟中,竇房結是心房中發起所有電脈衝信號的地方。

  • In atrial fibrillation, electrical impulses are initiated randomly from many other sites called " ectopic sites " in and around the atria, commonly near the roots of pulmonary veins.

    當心房顫動時,心房內部與周遭通常位於肺靜脈根部,許多稱為異位點的其他地方便會隨機發出電脈衝信號。

  • These unsynchronized chaotic electrical signals cause the atria to quiveror fibrillaterather than contract.

    這些不同步且混亂的電子信號便會使心房顫抖或顫動,而不是正常地收縮。

  • Although the atrial rate during atrial fibrillation can be extremely high, most of the electrical impulses do not pass through the atrioventricular, the AV node, to the ventricles.

    雖然在心房顫動時心博率可以達到非常的高,但大多的電脈衝信號並沒有經過房室結通往心室。

  • This is due to refractory properties of the cells of the AV node.

    這是因為房室結細胞的無感特性所造成的。

  • Those that do come through are irregular.

    只有非正常的訊號才會通過。

  • Ventricular rate, or heart rate, is therefore irregular and can range from slowless than 60⏤to rapidmore than 100⏤beats per minute.

    這使得心博率或心率也跟著變得不正常,且會在低心率(每分鐘低於 60 下)與高心率(每分鐘高於 100 下)間徘徊。

  • On an ECG, atrial fibrillation is characterized by absence of P-waves and irregular narrow QRS complexes.

    在心電圖上,心房顫動的症狀能從 P 波的缺失與異常狹窄的的 QRS 複合波上顯現出來。

  • Reminder: P-wave represents electrical activity of the SA node that is now obscured by activities of multiple ectopic sites.

    小提醒:P 波代表的是竇房結的電子活動現在被多個不同的異位點給阻撓了。

  • The baseline may appear undulating or totally flat depending on the number of ectopic sites in the atria.

    根據心防內部的異位點數量,基線可能呈現些許起伏或是完全平坦的狀況。

  • In general, larger number of ectopic sites results in flatter baseline.

    一般而言,異位點數量越多,基線便會更加平坦。

  • As the atria do not function properly, the heart puts out less blood, and heart failure may occur.

    由於心房並未正常運作,心臟送出的血液便會減少,並可能導致心力衰竭。

  • The most common complication of atrial fibrillation, however, is the formation of blood clots in the atria.

    然而心房顫動最常見的併發症,其實是在心房內部形成血栓。

  • As the atria do not empty completely into the ventricles, the blood may stagnate inside the atria and blood clots may form.

    由於心房無法將所有血液送進心室中,因此血液便有可能在心房中堆積並形成血栓。

  • These clots may then pass into the bloodstream, get stuck in small arteries, and block them.

    這些血栓接著便有可能順著血液流動,最後卡在較小的動脈中並阻塞它們。

  • When a blood clot blocks an artery in the brain, a stroke may result.

    若血栓阻塞了大腦中的動脈,便有可能導致中風。

Atrial fibrillation is the most common type of cardiac arrhythmia.

心房顫動是心律不整類型當中最常見的。

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    alex 發佈於 2021 年 01 月 14 日
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