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Critical Care GBC > W2 D2 - ECG theory: Sinus rhythms > Flashcards

W2 D2 - ECG theory: Sinus rhythms Flashcards

1
Q

Explain the waves in correlation with the electrical activity in the heart

A

P wave
SA node /atria contracting

QRS segment
Ventricle contraction / depolarization

T wave
Ventricles rest/repolarization

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2
Q

How do you classify a sinus arrhythmia?

What do you call the rhythm when slow or fast?

A

Irregular rhythm
gradual lengthening and shortening of R-R
variation is more than 0.12 sec./3 boxes, shortest R-R compared to longest R-R

still sinus arrhythmia, do not call brady or tachy

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3
Q

How does breathing affect HR and rhythms?

A

Inspiration - increase HR
Expiration - decreases HR, dont need to compensate for decrease in preload

via baroreceptors and vagus nerve

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4
Q

How do you tell the difference between sinoatrial block and sinus arrest?

A

Sinoatrial block - one exact R-R interval missing
* impulse blocked after SA node, unable to travel to AV

Sinus arrest - NOT an exact interval
* no impulse from the SA node: no activity

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5
Q

What are treatments for bradycardia or sinus arrests in order?

A
  1. atropine
  2. dopamine/epinephrine
  3. trancutaneous pacing
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Critical Care GBC (33 decks)

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