ECG Basics Flashcards

1
Q

Which leads look at the left lateral surface of the heart?

A

I, aVL, V5, and V6

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2
Q

What is the normal length of the QRS?

A

0.12s (3 small squares)

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3
Q

Which leads look at the intraventricular septum?

A

V3 and V4

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3
Q

Which artery generally supplies the inferior surface of the LV?

A

R coronary artery

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5
Q

How much times does a smal square represent?

A

0.04s

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6
Q

Which way does the AP travel across the wall of the heart?

A

Endo to epicardium

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7
Q

Which leads look at the inferior surface of the heart?

A

II, III and aVF

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8
Q

Which leads look at the RA?

A

aVR

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9
Q

Which leads look at the RV?

A

V1 and V2

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10
Q

What is a normal PR interval?

A

0.12 to 0.2s (3 to 5 small squares)

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11
Q

What are the PR interval represent in terms of cardiac physiology?

A

The time taken for impulse to travel from the SA node, through the atrium, AV, bundle of his and into ventricular muscle

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12
Q

II, III and aVF is which artery?

A

R coronary artery

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13
Q

Which leads look at the anterior and lateral wall of the LV?

A

V5 and V6

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14
Q

How much times does a large square represent?

A

0.2s

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