Sun31October0735PM 9

Is it true or false that the following features are suggestive of supra-ventricular tachycardia (SVT) rather than sinus tachycardia?

True / False

A heart rate of 208 per minute Correct

The heart rate decreasing with a synchronised DC shock Correct

Cardioversion with a valsalva manoeuvre Correct

May be associated with a ventricular septal defect Correct

Presence of beat to beat variation Correct

Explanation

A variable R-R with a constant P-R interval occurs in sinus tachycardia.

A heart rate of greater than 160/min is suggestive of an SVT, and greater than 200/min is suggestive of an accessory pathway.

Carotid sinus massage and other vagal manoeuvres may assist in decreasing the heart rate and terminating an SVT.

Synchronised DC cardioversion is also effective at restoring the rate and rhythm in an emergency situation.

SVT is associated with congenital heart disease (CHD) and accessory pathway pathology:

Simple complexity - ASD/VSD/Valve disease

Moderate complexity - Fallots/Ebstein's abnormality

Great complexity-Fontan/Mustard/Total Cavopulmonary

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Average score: 81.01%

Times answered: 276