ECG Clues Supporting the Diagnosis of Ventricular
Tachycardia
|
|
1.
AV
dissociation (atrial capture, fusion beats)
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2.
QRS duration
> 140 ms for RBBB type V1 morphology; V1 > 160
ms for LBBB type V1 morphology
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3.
Frontal plane
axis –90° to 180°
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4.
Delayed
activation during initial phase of the QRS complex
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5.
LBBB
pattern—R wave in V1, V2 >40 ms
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6.
RBBB
pattern—onset of R wave to nadir of S > 100 ms
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7.
Bizarre QRS
pattern that does not mimic typical RBBB or LBBB QRS complex
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8.
Concordance
of QRS complex in all precordial leads
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9.
RS or
dominant S in V6 for RBBB VT
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10.Q
wave in V6 with LBBB QRS pattern
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11.Monophasic
R or biphasic qR or R/S in V1 with RBBB pattern
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Dr.Naren's Blizzard: Ventricular tachycardia
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