Exam 4 - Lecture 5 Flashcards

1
Q

in augmented leads, a stands for

A

augmented

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2
Q

aVR means

A

augmented, voltage, right arm has positive electrode

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3
Q

aVL means

A

augmented, voltage, left arm has positive electrode

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4
Q

aVF means

A

augmented, voltage, left foot has positive electrode

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5
Q

Augmented leads are ____ positive electrode, and ____ negative electrode.

A

One; Two

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6
Q

what would aVR read with a normal healthy heart during contraction? Where is the “negative” electrode?

A

negative deflection, since its running perfectly away from the positive electrode in the left arm.

it uses the middle area directly between left arm electrode and left leg electrode.

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7
Q

What lead would be able to look right between lead II and Lead III?

A

aVF

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8
Q

What degree angle is between standard leads and augmented leads?

A

30 degrees

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9
Q

aVR used leads at ____ and ____ to gather information

A

Left arm and left foot

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10
Q

aVL uses leads at ___ and ___ to gather information

A

Right arm and left foot

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11
Q

aVF uses leads at ___ and ____ to gather information

A

Right arm and left arm

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12
Q

aVF is using the positive or negative charge from which limbs?

A

Positive charge from the foot, and the negative average charge of the right and left arm

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13
Q

aVR is using the positive or negative charge from which limbs?

A

Positive right arm, and using the negative average charge from the left arm and the left foot.

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14
Q

aVL is using the positive or negative charge from which limbs?

A

Positive left arm, and using the negative average charge from the right arm and left foot.

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15
Q

All of the V-leads use _____ as the negative electrodes.

A

The negative charges of the limb-leads. Right arm/left arm, left foot.

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16
Q

V-leads are also called

A

precordial chest leads

17
Q

Leads V1 and V2 are called what and located where?

A

Septal leads, each side of sternum in 4th intercostal space.

18
Q

Leads V3 and V4 are alled what and located where?

A

Anterior leads, V4 is the 5th intercostal space to left side of heart

Leads V3 is sandwiched between Lead V4 and lead V2.

19
Q

Leads V5 and V6 are called what and located where?

A

Lateral leads, 5th intercostal space to left side of heart

20
Q

Which precordial lead should have the biggest deflection?

A

V4, most in line with MEA in healthy heart

21
Q

Which precordial leads are mostly negative?

A

V1 and V2

22
Q

Vectorcardiogram

A

used a long time ago, analyzed with a oscilloscope.

Reads the electrical activity of the heart as it depolarizes the ventricles. How its going down at 70 degrees at first, then more at 60, then less at 45, then the least at 30 degrees (degrees are randomized, but this is the direction of the numbers ordered)

23
Q

Inverted t-wave means the

A

tissues arent repolarizing normally

24
Q

If lead I and III are larger than lead II, is this a normal EKG?

A

No. Lead II should have the largest deflection, so there must be an axis deviation.

25
Q

Do the ventricles depolarize at the same time?

A

yes, for the most part

26
Q

If there is a resistor in the left bundle branch, what would the MEA look like? What does a resistor look like?

A

up and towards the left, cause the left ventricle is taking a long time to depolarize, skewing the MEA in its direction. Squiggly lines.

27
Q

If its 5 big boxes up, and 1 big box down, how many net mV is the QRS?

A

2 mV

28
Q

A large positive QRS in lead III could indicate?

A

hypertrophy in the right ventricle

Its large, so it takes more electrical current.

29
Q

A current of injury means

A

theres a current coming from injured tissue that is constantly depolarizing instead of repolarizing, causing an abnormal current