Further ECG

Question 1

Define a valsalva manoeuvre.

Answer 1

A forced expiration against a closed glottis

Question 2

How would you get a patient to perform a valsalva manoeuvre?

Answer 2

Lie them supine and ask them to blow into a 20ml syringe with enough force to push the plunger back.Despite not being able to achieve this, they will perform a valsalva manoeuvre

Question 3

How does the origin of the electrical activity differ when the QRS complex is broad as opposed to narrow?

Answer 3

Narrow: originates above the bundle of His
Broad: originates below the bundle of His