SVT (small study book)

Question 1

SVT caused by

Answer 1

electrical signal re-entering the atria from the ventricles

Question 2

duration of QRS in SVT

Answer 2

less than 125 ms

Question 3

DDx of narrow complex tachycardia

Answer 3

SVT- QRS regular + narrow + fast

AF- QRS irregular

Flutter- atrial rate usually less then 300bmp

Question 4

SVT and BBB can lead too

Answer 4

SVT with broad complex tachycardia

Question 5

WPW can be identified by…

Answer 5

slurred upstroke in the QRS and short PR ( normal PR 120-200)

Question 6

adenosine role in SVT

Answer 6

slows cardiac conduction, interrupting re-entry pathway resetting conduction
-cause a brief period of bradycardia/asystole

Question 7

acute management of unstable SVT

Answer 7

cardioversion

Question 8

name the long term management of SVT

Answer 8

medications: beta-blockers, calcium channel blockers, amiodarone
ablation

Question 9

outline a simple patho of the Valsalva

Answer 9

1. forceful exhalation: increased pressure in the thoracic pressure’
2. stimulates Strech receptors in PNS- vagal response, decreases HR
3. decreased venous return, SNS stimulated, increased HR
4. pressure released, back to baseline, large amounts of blood in the heart, increased Q, self regulates too normal.