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Bradycardia, also known as bradyarrhythmia, is a slow heart rate, namely, a resting heart rate of under 60 beats per minute (BPM) in adults.〔(【引用サイトリンク】url=http://www.nhlbi.nih.gov/health/health-topics/topics/arr/types )〕 It is a type of cardiac arrhythmia. It seldom results in symptoms until the rate drops below 50 BPM. It sometimes results in fatigue, weakness, dizziness, and at very low rates fainting.〔(Sinus Bradycardia ) – eMedicine〕 During sleep, a slow heartbeat with rates around 40–50 BPM is common, and is considered normal. Highly trained athletes may also have athletic heart syndrome, a very slow resting heart rate that occurs as a sport adaptation and helps prevent tachycardia during training. The term relative bradycardia is used in explaining a heart rate that, although not actually below 60 BPM, is still considered too slow for the individual's current medical condition. ==Definition and etymology== Bradycardia in an adult is any heart rate less than (BPM), although symptoms usually manifest only for heart rates less than 50.〔 The word ''bradycardia'' is from the Greek βραδύς, ''bradys'' "slow", and καρδία, ''kardia'', "heart". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「bradycardia」の詳細全文を読む スポンサード リンク
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