6_Supraventricular Arrhythmias Part A

Question 1

What are the 3 mechanisms of rhythm abnormalties?

Answer 1

• abnormal automaticity
• reentry mechanism
• triggered activity

Question 2

Can be caused by an increase in parasympathetic tone or during respiration.

Answer 2

sinus arrhythmia

Question 3

What is the difference between SA block and SA pause/arrest?

Answer 3

SA block: multiple of the basic sinus interval

SA pause/arrest: not a multiple of previous sinus interval

Question 4

What is the difference between absolute and relative refractory period?

Answer 4

absolute - no chance of conduction

relative - certain stimulus will result in contraction

Question 5

What 2 things are common in ventricular escape beats?

Answer 5

• wide QRS

- no P-waves

Question 6

If the longest RR-interval exceeds the shortest interval by 0.16s or 10% this signifies what type of rhythm?

Answer 6

Sinus arrythmia

Question 7

What is the mnemonic used to remember what sinus tachycardia could be a physiologic response to?

Answer 7

TACH FEVER

Question 8

What are 2 important distinctions of wandering atrial pacemaker?

Answer 8

• at least 3 different P morphologies

- PR distance varies

Question 9

PACs that occur when AV node is partially refractory resulting in a wide QRS is called what?

Answer 9

Aberrant PAC

Question 10

What is an ectopic beat every other contraction called? Every third contraction?

Answer 10

bigeminy; trigeminy

Question 11

What is a common finding in atrial escape beats?

Answer 11

retrograde P-waves