Differential Diagnosis of Tachycardias

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    Diferential Diagnosis oDiferential Diagnosis o

    TachycardiasTachycardias

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    Differential diagnosis of broad complex tachycardias

    Criteria for the diagnosis of the presence of a

    broad complex tachycardia:

    QRS >120ms = Broad Complex achycardia

    QRS !120ms = "arro# Complex achycardia

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    TachycardiasTachycardias

    Narrow QRSNarrow QRS

    Sinus tachycardiaSinus tachycardia

    Atrial tachycardiaAtrial tachycardia

    Atrial brillationAtrial brillation

    Atrial FlutterAtrial Flutter

    AVRNTAVRNTAVRTAVRT

    SVTSVT

    Broad QRSBroad QRS

    Ventricular tachycardiaVentricular tachycardia

    SVT with abnormalSVT with abnormal

    conductionconduction

    Bundle branch blockBundle branch block

    Rate relatedRate relatedVentricular preVentricular pre

    e!citatione!citation

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    Differential diagnosis of broad complex tachycardias

    he rhythm strip ta$en from a single lead isgenerally ins%fficient to ma$e a differential

    diagnosis bet#een an S& #ith aberrancy

    or &' ( 12 lead )C* is re+%ired for

    ma$ing an acc%rate diagnosis'

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    Differential diagnosis of broad complex tachycardias

    he presence of anyone of the follo#ing confirms the

    diagnosis of &,

    )-idence of ('&'Dissociation.'in the form ofindependent atrial acti-ity'

    /resence of f%sion beats

    /resence of capt%re beats

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    AV dissociationAV dissociation

    Atrio"entricular dissociation inAtrio"entricular dissociation in

    #ono#orphic "entricular tachycardia#ono#orphic "entricular tachycardia$note % &a"es' arro&ed($note % &a"es' arro&ed(

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    )apture beat)apture beat

    )apture beat)apture beat

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    Fusion BeatFusion Beat

    Fusion beatFusion beat

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    Differential diagnosis of broad complex tachycardias

    n patients #ith D.' .'

    03 of broad complex

    tachycardias #ill be -entric%lar

    in origin

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    QRS Conto%rs 4a-o%ring &entric%lar achycardia

    5ellens *%lamh%sein

    16716 810039 :;7:< 8:39

    7 810039 171: 8639

    271 8:39 1:710810039

    171 810039 :7;08;39

    Wagner (2001) Marriotts Practical Electrocardiography 10th Ed

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    &1

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