Stokes–Adams syndrome (alternative eponyms include Adams–Stokes syndrome, Gerbezius-Morgagni-Adams–Stokes syndrome and Gerbec-Morgagni-Adams–Stokes syndrome) is a periodic fainting spell in which there is a periodic onset and offset of blockage of heart due to disorder of heart rhythm that may last for seconds, hours, days, or even weeks before the conduction returns.