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Critical Care > ECG INTERPRETATION > Flashcards

ECG INTERPRETATION Flashcards

1
Q

What occurs during the P Wave?

A

SA node fires, atria depolarize

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2
Q

What occurs during the PR interval?

A

Onset of atrial depolarization to onset of ventricular depolarization

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3
Q

What is a normal PR interval?

A

0.12-0.20 seconds (3-5 boxes)

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4
Q

What occurs during the QRS complex?

A

Firing of the AV node and ventricular depolarization

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5
Q

What occurs during the Q wave?

A

Impulse travels through intraventricular septum

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6
Q

What occurs during the R wave?

A

Impulse travels through the main mass of the ventricles

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7
Q

What occurs during the S wave?

A

Impulse travels to the base of the heart and atrial repolarization

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8
Q

What is a normal QRS interval?

A

Less than 0.12 seconds

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9
Q

What occurs during the ST segment?

A

Ventricles contract and pump blood

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10
Q

When do you start measuring the QT interval and where do you stop?

A

Start: onset of ventricular depolarization
End: end of ventricular repolarization

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11
Q

What is a normal QT interval?

A

Less than half of the R-R interval (0.36-0.44 seconds)

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12
Q

What is the inherent rate of the SA node?

A

60-100

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13
Q

What is the inherent rate of the AV node?

A

40-60

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14
Q

What is the inherent rate of the purkinjie fibers?

A

15-40

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15
Q

What does a PR interval of greater than 0.20 seconds indicate?

A

1st degree AV block

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16
Q

What does a QRS complex of 0.12 or more seconds indicate?

A

Bundle branch block

17
Q

After assessing the patient, what is the treatment for sinus bradycardia?

A

Atropine 0.5mg IV

18
Q

After assessing the patient, what is the treatment for sinus tachycardia?

A

Treat the cause, administer beta blockers and calcium channel blockers

19
Q

What occurs during the T wave?

A

Ventricular repolarization

20
Q

What might an elevated ST segment indicate?

A

Myocardial infarction

Critical Care (3 decks)

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