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c_broadcomplextachy

broad complex tachycardias

see also:

AV nodal blockers, particularly, verapamil, but also adenosine, may cause VF if given to patients with WPW with broad complex tachyarrythmias unless it is definetely antidromic AVRT and not AF or atrial flutter

acute Mx of broad complex tachycardia:

DDx of wide complex tachycardias:

  • note:
    • An RS (from the initial R to the nadir of S) interval longer than 100 ms in any precordial lead is highly suggestive of VT.
    • A QRS pattern with negative concordance in the precordial leads is diagnostic for VT (“negative concordance” means that the QRS patterns in all of the precordial leads are similar, and with QS complexes). Positive concordance does not exclude antidromic AVRT over a left posterior accessory pathway.
    • The presence of ventricular fusion beats indicates a ventricular origin of the tachycardia.
    • QR complexes indicate a myocardial scar and are present in approximately 40% of patients with VTs after myocardial infarction.
c_broadcomplextachy.txt · Last modified: 2019/01/09 11:16 by wh