Ventricular Tachycardia: Difference between revisions

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*'''Polymorphic VT''': the ventricular beats have a changing configuration. The RR interval is 180-600 ms (comparable to a heart rate of 100-333 bpm).
*'''Polymorphic VT''': the ventricular beats have a changing configuration. The RR interval is 180-600 ms (comparable to a heart rate of 100-333 bpm).
*'''Biphasic VT''': a ventricular tachycardia with a QRS complex that alternates from beat to beat. Associated with [[Miscellaneous#Digoxin|digoxin intoxication]] and [[lqts|long QT syndrome]].
*'''Biphasic VT''': a ventricular tachycardia with a QRS complex that alternates from beat to beat. Associated with [[Miscellaneous#Digoxin|digoxin intoxication]] and [[lqts|long QT syndrome]].
==Localisation of the origin of a ventricular tachycardia==
The localisation of the origin (or exit site) of a ventricular tachycardia can be helpful in understanding the cause of the VT and is very helpful when planning an ablation procedure to treat a ventricular tachycardia.
The steps to finding the exit site are:
# What is the bundle branch block (BBB) configuration?
# What is the inferior lead QRS complex polarity
# What is the lead I QRS complex polarity
# What is the lead aVL QRS complex polarity
# What is the lead aVR QRS complex polarity
# Where is the R-wave transition point
Using this approach and the algorithm on the right <cite>segal</cite> the exit site can be estimated with reasonable accuracy (PPV around 70%).
==Examples==
==Examples==
<gallery >
<gallery >
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File:DVA2161.jpg|A biphasic VT in a patient with long QT syndrome
File:DVA2161.jpg|A biphasic VT in a patient with long QT syndrome
</gallery>
</gallery>
==References==
<biblio>
#segal pmid=17338765
</biblio>

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