Chapter 2: Recording the EKG Flashcards

1
Q

The smallest divisions on EKG graph paper are…

A

…one millimeter (mm) squares.

p. 31

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2
Q

Between the heavy black lines are __ small squares.

A

5

p. 31

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3
Q

The height and depth of a wave are measured vertically from the baseline in millimeters, and this vertical _________ represents a measure of _______.

A

amplitude
voltage
(p. 32)

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4
Q

Ten millimeters vertically represents ___ _________ (__), however, in practice, one usually speaks of millimeters.

A
one millivolt (mV)
(p. 32)
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5
Q

The amount of time represented by the distance between 2 heavy black lines is…

A

… 0.2 sec.

p. 34

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6
Q

Each small division between two fine lines represents…

A

… 0.04 of a sec (four hundredths of a second)

p. 34

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7
Q

The conventional standard for where to place limb electrodes is on the…

A

…right arm, left arm, and left leg.

p. 37

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8
Q

The placement of these 3 limb electrodes is the same as originally used by…

A

…Willem Einthoven.

p. 37

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9
Q

Recording a lead…

A

…requires at least two electrodes.

p. 37

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10
Q

Because one electrode is ________ and one is ________, these leads are called “_______” limb leads.

A

positive, negative, bipolar

p. 38

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11
Q

Lead I is horizontal, and its ____ arm electrode is ________, while its right arm electrode is ________.

A

left, positive, negative

p. 38

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12
Q

When looking at lead III, the ____ arm electrode is now ________, and the left leg electrode is ________.

A

left, negative, positive

p. 38

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13
Q

The EKG machine permits us to make any skin electrodes…

A

…positive or negative depending on which lead the machine is recording.
(p. 38)

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14
Q

The bipolar limb lead configuration is sometimes called…

A

…“Einthoven’s triangle”.

p. 38

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15
Q

The three bipolar limb leads can be moved to the center of the imaginary triangle, producing…

A

….3 intersecting lines of reference, which remain at the same angles relative to each other.
(p. 39)

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16
Q

The AVF lead uses the ____ ____ electrode as ________ and both arm electrodes as a common ground (________).

A

left foot
positive
negative
(p. 40)

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17
Q

Who designed and introduced the augmented limb leads?

A

Dr. Emanuel Goldberger

p. 40

18
Q

Dr. Goldberger discovered that in order to record a lead in this manner, he had to _______ (augment) the voltage in the EKG machine to match the wave _________ of leads I, II, and III.

A

amplify, magnitude

p. 40

19
Q

Where did the name AVF originate?

A

A (Augmented), V (Voltage), (left Foot)

p. 40

20
Q

AVF is essentially a combination of…

A

…leads II and III.

p. 40

21
Q

For the AVR lead, the _____ arm electrode is ________, and the remaining two electrodes are ________.

A

right, positive, negative

p. 41

22
Q

For the AVL lead, the _____ arm electrode is ________, and the remaining two electrodes are ________.

A

left, positive, negative

p. 41

23
Q

How do you remember which lead is positive in each of the augmented leads?

A

AVR - right arm positive
AVL - left arm positive
AVF - foot (left foot) positive
(p. 41)

24
Q

These augmented limb leads are sometimes called the “________” limb leads, stressing the importance of the ________ electrode.

A

unipolar, positive

p. 41

25
Q

The augmented limb leads intersect at __ degree angles.

A

60

p. 42

26
Q

All 6 limb leads meet to form six intersecting leads that lie in the “_______” plane on the patient’s chest.

A

frontal

p. 43

27
Q

Which leads are considered the inferior leads?

Where is the positive electrode for these leads?

A

leads II, III, and AVF
positive left foot electrode
(p. 47)

28
Q

Which leads are considered the lateral leads?

Where is the positive electrode for these leads?

A

I and AVL
positive left arm electrode
(p. 47)

29
Q

Are the V1 - V6 electrodes positive or negative?

A

positive

p. 48

30
Q

In general, each of the chest leads (V1 - V6) is oriented through the __ ____ and projects through the patient’s ____ which is negative.

A

AV node, back

p. 49

31
Q

If leads V1 through V6 are imagined to be the spokes of a wheel, the center of the wheel is the…

A

…AV node.

p. 49

32
Q

The chest (precordial) leads were introduced by…

A

…Dr. Frank Wilson.

p. 49

33
Q

On the V1 chest lead, the QRS complex is mainly…

A

…negative.

p. 50

34
Q

On the V6 chest lead, the QRS complex is mainly…

A

…positive.

p. 50

35
Q

When looking at V6, we know that the mainly _______ QRS complex is produced by ventricular depolarization moving toward the ________ chest electrode of V6.

A

positive; positive

p. 50

36
Q

Leads V1 and V2 are oriented over the…

A

…right side of the heart.

p. 51

37
Q

Leads V5 and V6 are oriented over the…

A

…left side of the heart.

p. 51

38
Q

Leads V3 and V4 are generally oriented over the…

ALERT!! NOTE THIS INFORMATION FOR THE EXAM

A

…interventricular septum.

THAT SAID, Dr. Miller’s PPT states that V1 and V2 best record electrical activity of the septum. This is different from what is presented in Dubin’s book.
(p. 52)

39
Q

The interventricular septum is the common ____ shared by the right and left ventricles. It also contains the _____ and ____ ______ ________.

A

wall, right and left bundle branches

p. 52

40
Q

The six limb leads lie in the _______ plane, while the six chest leads lie in the __________.

A

frontal, horizontal

p. 53