?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Pattern+of+initiation+of+monomorphic+ventricular+tachycardia+in+recorded+intracardiac+electrograms%0A&rft.creator=Haghjoo%2C+Majid&rft.creator=Arya%2C+Arash&rft.creator=Sadr-Ameli%2C+Mohammad+Ali&rft.subject=Indian+Pacing+and+Electrophysiology+Journal&rft.description=Background%3A+By+analyzing+stored+intracardiac+electrograms+during+spontaneous+monomorphic+ventricular+tachycardia+(VT)%2C+we+examined+the+patterns+of+the+VT+initiation+in+a+group+of+patients+with+implantable+cardioverter+defibrillators+(ICDs).+%0AMethods%3A+Stored+electrograms+(EGMs)+were+monomorphic+VTs+and+at+least+5+beats+before+the+initiation+and+after+the+termination+of+VT+were+analyzed.+Cycle+length%2C+sinus+rate%2C+and+the+prematurity+index+for+each+episode+were+noted.+%0AResults%3A+We+studied+182+episodes+of+VT+among+50+patients+with+ICDs.+VPC-induced+(extrasystolic+initiation)+episode+was+the+most+frequent+pattern+(106%3B+58%25)+followed+by+76+episodes+(42%25)+in+sudden-onset+group.+Among+the+VPC-induced+group%2C+VPCs+in+85+episodes+(80%25)+were+different+in+morphology+from+subsequent+VT.+Sudden-onset+episodes+had+longer+cycle+lengths+(377%C2%B130ms)+in+comparison+with+the+VPC-induced+ones+(349%C2%B129ms%3B+P%3D+0.001).+Sinus+rate+before+VT+was+faster+in+the+sudden-onset+compared+to+that+in+VPC-induced+one+(599%C2%B1227ms+versus+664%C2%B1213ms%3B+P%3D0.005).+Both+of+these+episodes+responded+similarly+to+ICD+tiered+therapy.+++++There+was+no+statistically+significant+difference+in+coupling+interval%2C+prematurity+index%2C+underlying+heart+disease%2C+ejection+fraction%2C+and+antiarrhythmic+drug+usage+between+two+groups+(P%3DNS).++++%0AConclusions%3A+Dissimilarities+between+VT+initiation+patterns+could+not+be+explained+by+differences+in+electrical+(coupling+interval%2C+and+prematurity+index)+or+clinical+(heart+disease%2C+ejection+fraction%2C+and+antiarrhythmic+drug)+variables+among+the+patients.++There+is+no+association+between+pattern+of+VT+initiation+and+the+success+rate+of+electrical+therapy.+%0A&rft.publisher=Indian+Pacing+and+Electrophysiology+Group&rft.contributor=Singh%2C+Balbir&rft.contributor=Lokhandwala%2C+Yash&rft.contributor=Francis%2C+Johnson&rft.contributor=Gupta%2C+Anup&rft.date=2005-10&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=text%2Fhtml&rft.identifier=http%3A%2F%2Fcogprints.org%2F4592%2F1%2Fhaghjoo3.htm&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F4592%2F2%2Fhaghjoo3.pdf&rft.identifier=++Haghjoo%2C+Majid+and+Arya%2C+Arash+and+Sadr-Ameli%2C+Mohammad+Ali++(2005)+Pattern+of+initiation+of+monomorphic+ventricular+tachycardia+in+recorded+intracardiac+electrograms.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F4592%2F