字幕翻译：Jessie
房室传导阻滞是指冲动在房室传导过程中受到阻滞。分为不完全性和完全性两类。前者包括一度房室传导阻滞和二度房室传导阻滞，后者又称三度房室传导阻滞，阻滞部位可在心房、房室结，希氏束及双束支。
Atrioventricularblock(AVblock)isatypeofheartblockinwhichtheconductionbetweentheatriaandventriclesoftheheartisimpaired.Undernormalconditions,thesinoatrialnode(SAnode)intheatriasetsthepacefortheheart,andtheseimpulsestraveldowntotheventricles.InanAVblock,thismessagedoesnotreachtheventriclesorisimpairedalongtheway.Theventriclesofthehearthavetheirownpacingmechanisms,whichcanmaintainaloweredheartrateintheabsenceofSAstimulation.
ThecausesofpathologicalAVblockarevariedandincludeischaemia,infarction,fibrosisordrugs,andtheblocksmaybe早期白癜风怎么治疗百癜疯
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