在日常生活中，有很多種因素都可能導致心跳加速從而感到心慌，但是如果沒有明確誘因的時候出現心慌，就要考慮心臟相關的疾病，比如房顫。
有人說房顫的感覺就像：
“心跳得像揣了一只兔子”
“莫名其妙出現心慌”
“心率每分鐘可能會達到100-200次之間……”
那房顫是很嚴重的病嗎？
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正常的心房收縮和舒張是非常規律的，一旦房顫，心臟就開始“打哆嗦”，這時血流就會變慢，心房里面有一個像小耳朵的地方，學名叫作“左心耳”，左心耳里面“溝壑”很多，很容易淤積血液形成血栓。
而這個血栓一旦脫落，會順著血流的方向流動，一旦進入大腦，栓塞到一個小血管，可能還沒有什么感覺；但如果栓塞到一個大血管或者一個比較重要的血管，就會出現非常嚴重的問題。我們平時見到的患者忽然就半身不遂、說不出話或者暈厥等，很多都是這種原因造成的。
如果沒有對房顫進行及時有效的干預，那么部分患者會發生卒中。卒中不僅容易導致偏癱、半身不遂，甚至會導致直接腦死亡。
正常情況下，心房規律收縮，向心室泵血，心室再將血泵給全身。房顫時，這種心房的有效收縮功能喪失，心房向心室的泵血減少因此心室泵向全身的血就減少了。
此外，心房跳動得不規則時，會導致心室的跳動也變得亂了起來，時間一長就容易引起心肌重塑、心臟結構改變，進而引起心衰。尤其是當房顫急性發作，心室跳得非?？斓臅r候，更容易快速誘發心衰!
而當房顫和心衰合并出現時，這樣的患者可出現胸悶氣短、乏力的癥狀，活動耐力下降，譬如同齡人可以爬三層樓梯，但心功能不全的患者可能爬一層樓就必須要歇一會兒了，或者可能走一小段路就需要休息一下。
還有些患者會出現水腫(尤其是下肢水腫)、憋氣、食欲差、夜間不能平臥，甚至粉紅色泡沫樣痰的癥狀。當出現這樣的癥狀時，已經是病情嚴重的表現了。一定盡量立即就醫!
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