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P&A final > EKG > Flashcards

EKG Flashcards

1
Q

What is the inherent rate of the SA node?

A

60-100 BPM

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2
Q

What is the inherent rate of the AV node?

A

40-60 BPM

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3
Q

What is the inherent rate of the ventricles?

A

20-40 BPM

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4
Q

What does the parasympathetic nervous system vagus nerve do?

A

Decreases rates
Slows impulse conduction
Decreases force of contraction

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5
Q

What does the sympathetic nervous system do?

A

Increases rate

Increases force of contraction

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6
Q

How long is each little box?

A

0.04 seconds

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7
Q

What is the P wave?

A

Atria contracting

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8
Q

What is the QRS complex?

A

Ventricles contracting

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9
Q

What is the T wave?

A

Repolarization of ventricles

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10
Q

What is the ST interval?

A

The complete time for repolarization

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11
Q

How long should a PR interval be?

A

0.12-0.20 seconds

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12
Q

How do you measure a PR interval

A

From the beginning of the P wave until where the R wave begins

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13
Q

How long should a QRS interval be?

A

<0.12 seconds

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14
Q

How do you measure the QRS interval?

A

Measure from beginning of Q wave to S

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15
Q

How do you find the HR using EKG 6 second strip?

A

Count QRS complexes and multiply by 10

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16
Q

How many BPM in 1 big box?

A

300

17
Q

How many BPM in 2 big boxes?

A

150

18
Q

How many BPM in 3 big boxes?

A

100

19
Q

How many BPM in 4 big boxes?

A

75

20
Q

How many BPM in 5 big boxes?

A

60

21
Q

How many BPM in 6 big boxes?

A

50

22
Q

How many BPM in 7 big boxes?

A

43

23
Q

What causes cardiac contraction to begin?

A

Depolarization of cardiac cells

24
Q

What is automaticity?

A

The ability of cardiac cells to initiate an impulse spontaneously and continuously

25
Q

What is contractility?

A

The muscle responding and squeezing

26
Q

What is excitability?

A

The ability of cardiac cells to respond to an electrical impulse

27
Q

What is conductivity?

A

Related to transmission of the impulse from one fiber to another

28
Q

What metaphor can be used to remember the AV node?

A

AV node is a bouncer - only letting a certain amount of people into the club at a time

29
Q

What does a prolonged QT interval increase the risk of?

A

Lethal ventricular arrhythmia

30
Q

What does a QRS complex of >0.12 seconds indicate?

A

Bundle branch block

31
Q

How long is the QT interval usually?

A

0.32 to 0.40 if the HR is between 65-95

P&A final (6 decks)

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