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Clinical Methods > Cardiac Disorders and 12 Lead EKG Part 5 > Flashcards

Cardiac Disorders and 12 Lead EKG Part 5 Flashcards

1
Q

Views the heart in a vertical plane is synonymous with what plane?

A

frontal plane

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2
Q

In this frontal plane image, limb leads view heart’s electrical activity (depolarization & repolarization) moving in what directions (name in order) through this circle?

A

up, down, right, and left

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3
Q

What lead is this?

LA +

RA -

Angle of orientation is ___º

A

Lead I

0

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4
Q

What lead is this?

Legs +

RA -

Angle = ____º

A

Lead II

60

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5
Q

What lead is this?

legs +

left arm -

Angle is ____º

A

III

120

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6
Q

What lead is this?

left arm +

other limbs -

Angle is ____º

A

aVL

-30

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7
Q

What lead is this?

RA +

Other limbs -

Angle is ___º

A

aVR

-150

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8
Q

What lead is this?

Legs +

Other limbs -

Angle is ___º

A

aVF

90

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9
Q

The 6 precordial leads arranged across chest in horizontal plane, views heart’s electrial activity moving _______ and ______.

A

anteriorly & posteriorly

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10
Q

What lead is placed at 4th ICS right of sternum?

A

V1

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11
Q

What lead is placed at the 4th ICS left of sternum?

A

V2

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12
Q

What lead is placed at the 5th ICS in the midclavicular line?

A

V4

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13
Q

Lead V3 is placed where?

A

between V2 and V4

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14
Q

What lead is placed in the 5th ICS in the midaxillary line?

A

V6

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15
Q

Where is lead V5 placed?

A

between V4 and V6

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16
Q

Inferior leads are what 3 leads?

A

II

III

aVF

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17
Q

Left lateral leads are what leads? (4)

A

I

aVL

V5

V6

18
Q

Anterior leads are what leads? (2)

A

V3

V4

19
Q

Lead aVR is _____.

A

alone

20
Q

Light lines on the EKG, small boxes are __ x___mm squares.

A

1x1

21
Q

Dark lines, or large box on the EKG strip are ___x___ mm squares

A

5 X 5

22
Q

Small square distance = ____ sec

A

0.04

23
Q

Large square distance= ____sec

A

0.2

24
Q

Vertical axis on EKG strip is _____.

A

voltage

25
Q

Horizontal axis or EKG strip is _____.

A

time

26
Q

Each small square on y-axis is ___mV

A

0.1

27
Q

Each large square on y-axis is ____mV.

A

0.5 mV

28
Q

Atrial depolarization begins at SA node and is indicated on the EKG as ______.

A

P wave

29
Q

___ wave

Vector of current flow points from R→L and inferiorly.

A

P wave

30
Q

The P Wave

Any lead that views the wave of atrial depolarization as moving toward it will record a ____ deflection (I, aVL, II, aVF, V5, V6)

A

positive

31
Q

The P Wave

As moving perpendicular to it will record a ____ wave (III V1)

A

biphasic

32
Q

The P Wave

As moving away from it will record a ______ deflection (aVR)

A

negative

33
Q

What represents the time from the start of atrial depolarization to the start of ventricular depolarization including delay in conduction from AV node?

A

PR Interval

34
Q

PR interval = ____-____seconds

A

0.12 - 0.2

35
Q

Definition: The interventricular septum depolarizes left-to-right and a small negative deflection can be seen in: I, aVL, V5, and V6.

A

Septal Q-waves

36
Q

Definition: Ventricular (LV) depolarization current vector points 0-90º.

Large positive R waves are seen in (I, II, III, aVL, aVF, V5, V6,) and negative R wave in aVR. *

Note: R wave progression in precordial leads.

A

QRS complex

37
Q

This represents the time from the end of ventricular depolarization to the start of ventricular repolarization

A

ST segment

38
Q

This represent repolarization that usually begins in the last area of the heart to have been depolarized.

A

T wave

39
Q

What encompasses the time from the beginning of ventricular depolarization to the end of ventricular repolarization?

A

QT interval

40
Q

QT duration is proportionate to what?

A

HR

41
Q

What composes 40% of the cardiac cycle?

A

QT interval

42
Q

What leads are interventricular septum leads? (2)

A

V1 and V2

Clinical Methods (23 decks)

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