Cardiac arrhythmias during sleep

摘要: Different types of cardiac arrhythmias may arise in healthy subjects during sleep. Whereas bradyarrhythmias (severe sinus bradycardia, arrest, first and second degree A-V blocks) predominate the young, elderly more commonly present supraventricular ventricular ectopic beats tachyarrhythmias (supraventricular paroxysmal tachycardia, atrial flutter, etc.). A rare potentially life-threatening syndrome, characterised by arrests accompanied vagal overactivity, has been described young adults REM sudden death sleep apparent helthy Southeast Asian immigrants U.S., described, be related to fibrillation. The frequency episodes tachycardia appears follow a circadian rhythm, presenting minimum peak between 4 6 a. m. two maximal peaks morning afternoon. In contrast, likelihood for development an episode fibrillation (PAF) is same wakefulness, slow Power spectral analysis heart rate variability established that PAF are always preceded shift sympathovagal balance towards sympathetic limb. influence on (ventricular premature (VPB) (VT)) controversial. Most studies show exerts inhibitory effect with possible trend (the lowest incidence occurring early hours). Our polygraphic failed disclose any arrhythmias. Obstructive apnea syndrome (OSAS) one most common causes Of these, frequent brady-tachyarrhythmia. First atrioventral blocks, severe bradycardia lasting over 2.5 s. (but also than 10 s.) common. Even though these severe, it yet whether they direct cause OSAS patients. conclusion, even many sleep, there no evidence determinant factor. Some minimal hours appear affected which at least partly sleep-dependent. only truly linked obstructive apneas.