Basic EKG principals Flashcards

1
Q

The EKG results from electrical changes associated with activation first of the

A

atria and then of the ventricles.

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2
Q

Atrial depolarization causes the

A

P wave

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3
Q

Ventricle depolarization causes the

A

QRS

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4
Q

Regarding the QRS, if the first deflection is downward it is a

A

Q wave

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5
Q

Regarding the QRS, any upward deflection is an

A

R wave

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6
Q

Regarding the QRS, a downward deflection after the R wave is a

A

S wave

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7
Q

When the depolarization wave spreads toward a lead, the deflection is

A

Predominately upward

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8
Q

When the depolarization wave spreads away from a lead, the deflection is

A

predominately downward

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9
Q

Name the six limb leads___.

A
I
II
III
VR
VL
VF
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10
Q

The six limb leads look at the heart from the

A

sides and the feet in a vertical plane

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11
Q

The cardiac axis is estimated from leads

A

I, II, and III.

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12
Q

The cardiac axis is the average

A

direction of spread of depolarization as seen from the front.

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13
Q

The chest or V leads look at the heart from the

A

front and the left side in a horizontal plane.

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14
Q

Lead V1 is positioned over the

A

right ventricle

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15
Q

Lead V6 is positioned over the

A

left ventricle

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16
Q

The septum is depolarized from the

A

left side to the right

17
Q

In a normal heart, the left ventricle exerts more influence on the EKG than the

A

right ventricle