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Cardiopulmonary > ECG part 1 > Flashcards

ECG part 1 Flashcards

1
Q

What are the 3 unique properties of cardiac myocytes?

A

Automaticity
Rhythmicity
Conductivity

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2
Q

What node is the primary pacemaker of the heart and what is it’s inherent discharge rate?

A

SA node
60-100

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3
Q

What inherent discharge rate does the AV node have?

A

40-60

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4
Q

What is the inherent discharge rate of the purkinje fibers?

A

30-40

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5
Q

rank the hierarchy of rhythmicity

A

Autonomic influence
SA
AV
Purkinje

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6
Q

What ion is entering during myocyte depolarization?

A

Na+

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7
Q

What ion is exiting during myocyte repolarization?

A

K+

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8
Q

When a wave of depolarization is moving toward a positive electrode on the skin, the ECG records a simultaneous _______ deflection.

A

upward

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9
Q

When a wave of repolarization is moving toward a positive electrode on the skin, the ECG records a simultaneous _______ deflection.

A

downward

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10
Q

During the P wave, the impulse is spread to the LA via ____________.

A

Bachmann bundle

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11
Q

What is the PR interval?

A

slight delay that occurs when the spread of depolarization reaches the AV node

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12
Q

Does the R or L bundle ranch have an anterior and posterior division?

A

L

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13
Q

QRS complex occurs when the electric impulse reaches ________.

A

purkinje fibers

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14
Q

What is the absolute refractory period?

A

interval from the beginning of the QRS complex to the apex fo the T wave

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15
Q

What 3 things does a single lead assessment look for?

A

heart rate or rhythm
normal waveforms
abnormal waveforms

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16
Q

Single limb monitoring can only accurately assess _____ and _____.

A

rate
rhythm

17
Q

What is the normal duration of the PR interval?

A

.12-.20 sec

18
Q

What is the normal duration of the QRS complex?

A

.06-.10 sec

19
Q

First degree AV block occurs when the impulse is what?

A

initiated in the SA node but is delayed on the way to the AV node

20
Q

Second degree AV block occurs ____ in the AV junction and prevents what?

A

high
conduction of some of the impulses through AV node

21
Q

With Mobitz I (Wenckeback), as _____ increases, _______ will eventually be dropped

A

PR interval
QRS complex

22
Q

Mobitz II has intermittent non-conducted P waves _________ progressive prolongation of PR interval.

A

without

23
Q

What should remain fine with Mobitz II?

A

CO

24
Q

With 3rd degree AV block, what happens with the atria and ventricles?

A

they fire at their own inherent rate

25
Q

How is a first degree block treated?

A

benign and usually not treated

26
Q

How is a second degree block treated?

A

either no treatment or a pacemaker (if they have too many drops)

27
Q

What are 2 causes of 3rd degree AV block?

A

MI
degeneration of the conducting system

28
Q

What is the treatment for 3rd degree block?

A

permanent pacemaker placement

Cardiopulmonary (3 decks)

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