PSVT
Paroxysmalsupraventriculartachycardia
室上性心动过速
Paroxysmal阵发性supraventricular室上tachycardia心跳过速(PSVT)isepisodes发作ofrapidheartratethatstartinapartoftheheartabovetheventricles心室."Paroxysmal"meansfromtimetotime.
Causes
Normally,thechambers心脏腔oftheheart(atria心房andventricles)contractinacoordinatedmanner.
Thecontractions收缩arecausedbyanelectricalsignalthatbeginsinanareaoftheheartcalledthesinoatrialnode窦房结(alsocalledthesinusnode窦结orSAnode房结节).
Thesignalmovesthroughtheupperheartchambers(theatria)andtellstheatriatocontract.
Afterthis,thesignalmovesdownintheheartandtellsthelowerchambers(theventricles)tocontract.
TherapidheartratefromPSVTmaystartwitheventsthatoccurinareasoftheheartabovethelowerchambers(ventricles).
ThereareanumberofspecificcausesofPSVT.Itcandevelopwhendosesoftheheartmedicine,digitalis强心剂,aretoohigh.ItcanalsooccurwithaconditionknownasWolff-Parkinson-Whitesyndrome预激综合征,whichismostoftenseeninyoungpeopleandinfants婴儿.
ThefollowingincreaseyourriskforPSVT:
Alcoholuse
Caffeineuse
Illicitdrug违禁药use
Smoking
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