can't differenctiate VT vs SVT on ecg - USMLE Forums
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Old 09-09-2016
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Unhappy can't differenctiate VT vs SVT on ecg



Hey guys,

I'd really appreciate if someone can shed some light as to how can I learn to differentiate Vent. Tachycardia and Supraventricular Tachcardia by looking at an ECG....Ive tried reading about it, videos but just cant tell


Any tips or pointers are really appreciated!
thanks in advance!
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Old 09-09-2016
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They do not come from the same area as you know and this will change the shape of your QRS.

Ventricular Tachycardia usually is a BROAD complex rhythm. It is defined as three or more ventricular extrasystoles in succession at a rate of more than 120/min.

Supraventricular tachycardia comes from above the ventricule which means the atria. QRS complexes are usually NARROW unless there is an associated BB block (which can make cardiology annoying).

I hope this helps
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Old 09-09-2016
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SVT is also known as AV node re-entrant tachycardia. The arrhythmia begins in the AV node so there are no P waves on the ECG. If a P wave is present i will be inverted because the wave of depolarization is moving from the AV node towards the atria, rather than from the atria to the AV node. Finally in SVT you will see normal T waves after the QRS waves, and the rate > 150

Ventricular tachycardia has no P waves or T waves. VT just has wide QRS complexes recurring one after the other.

I hope that helps
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Old 09-09-2016
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vent tachy >> mostly WIDE QRS COMPLEXES
atrial tachy >> mostly NARROW QRS COMPLEXES (u look at this asap when u get a ecg after looking at rate and rhythm, p waves, intervals)

but there are some exceptions:

WPW syndrome SVT with delta waves
BBBs. and many more

SVT will include everything above bundle of His >> atria, pul veins, av node. so they will include atrial tachy, AVNRT(PSVT), AVRT(WPW), AFib, AF, Junctional tachy....

Ven tach and V fib on the other side.
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