6_Supraventricular Arrhythmias Part A Flashcards

1
Q

What are the 3 mechanisms of rhythm abnormalties?

A
  • abnormal automaticity
  • reentry mechanism
  • triggered activity
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2
Q

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

A

sinus arrhythmia

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3
Q

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

A

SA block: multiple of the basic sinus interval

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

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4
Q

What is the difference between absolute and relative refractory period?

A

absolute - no chance of conduction

relative - certain stimulus will result in contraction

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5
Q

What 2 things are common in ventricular escape beats?

A
  • wide QRS

- no P-waves

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6
Q

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

A

Sinus arrythmia

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7
Q

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

A

TACH FEVER

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8
Q

What are 2 important distinctions of wandering atrial pacemaker?

A
  • at least 3 different P morphologies

- PR distance varies

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9
Q

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

A

Aberrant PAC

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10
Q

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

A

bigeminy; trigeminy

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11
Q

What is a common finding in atrial escape beats?

A

retrograde P-waves

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