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Clinical Methods Test 1 > EKG I > Flashcards

EKG I Flashcards

1
Q

Myocytes

A

cardiac cells, electrically polarized at rest

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2
Q

Polarity

A

is maintaned by membrane pumps necessary to keep the inside of the cells electronegatave

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3
Q

which pump maintains membrane electrical polarity

A

sodium/potassium

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4
Q

Ratio of Na to K

A

3 Na outside for every 2 K inside

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5
Q

What is needed to keep cell polarized

A

ATP

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6
Q

pacemaker cells

A

electrical power source of the heart

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7
Q

electrical conducting

A

the hard wiring of the heart

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8
Q

myocardial cells

A

the contractile machinery of the heart

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9
Q

what determines rate of depolarization

A

innate electrical characteristcs of the cell and the external neurohormonal input

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10
Q

action potential

A

a record of one elecrical cycle of depolarization & repolarization from a single cell

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11
Q

sinus node

A

dominant pacemaker of the heart, located in the RA, rate 60-100 BP, altered by Autonomic NS

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12
Q

Automaticity

A

all hearts cells posses ability to behave as a pacemaker.

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13
Q

intrinsic pacing SA node

A

60-100

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14
Q

intrinsic pacing atrial foci

A

60-75

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15
Q

junctional foci AV

A

40-60

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16
Q

Ventricular foci (his bundle, etc.)

A

30-40

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17
Q

horizontal small square distance in time

A

.04 sec

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18
Q

horizontal large square distance in time

A

.2 sec

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19
Q

vertical small square voltage

A

.1mV

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20
Q

vertical large square voltage

A

.5mV

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21
Q

P Wave

A

atrial depolarization

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22
Q

3 parts of ventricular conduction

A

1-bundle of Hi, 2-Bundle Branches, 3-Terminal Purkinje fibers

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23
Q

Q wave

A

1st downard deflection

24
Q

R wave

A

1st upward deflection

25
Q

R prime

A

a second upward upward deflection

26
Q

S wave

A

1st downard deflection following an R wave

27
Q

QS wave

A

entire configuration consits solely of one downward deflection

28
Q

Repolarization

A

restoration of electronegative state

29
Q

T wave

A

represents the wave ventricular repolarization

30
Q

PR Interval

A

from p wave to the start of QRS

31
Q

ST Segment

A

from the end of the QRS complex to the beginning of the T wave

32
Q

QT interval

A

includes the QRS complex, ST segment, and the T wave

33
Q

positive deflection

A

a wave of depolarization towards a positive electrode

34
Q

negative deflection

A

a wave of depolarization away from a positive electrode

35
Q

biphasic wave

A

a depolarizing wave moving perpendicular to a postive electrode

36
Q

deflections are reversed in repolarization

A

toward positive (negative deflection), perpendicular (negative precedes positive)

37
Q

lead I

A

right arm (-) left arm (+)

38
Q

lead II

A

right arm (-) legs (+)

39
Q

Lead III

A

left arm (-) legs (+)

40
Q

AVL

A

left arm (+) other limbs (-)

41
Q

AVR

A

right arm (+) other limbs (-)

42
Q

AVF

A

legs (+) arms (-)

43
Q

Anterior view of the heart

A

V2, V3, V4

44
Q

Left Lateral view of the heart

A

I, aVL, V5, V6

45
Q

Inferior view of the heart

A

II, III, aVF

46
Q

right ventricular

47
Q

average movement

48
Q

PR interval

A

0.12-0.2 sec

49
Q

Delay in AV node significance

A

allows ventricles to fill

50
Q

Q wave _mV

51
Q

Q waves after inferior MI

A

strong negative Q wave.

52
Q

QRS average vector

A

0-90 degrees

53
Q

QRS Positive deflections

A

left lateral and inferior

54
Q

QRS duration

55
Q

> _mmhg in ST segment represents pathologic process

56
Q

QT represents _% of cardiac cycle

Clinical Methods Test 1 (8 decks)

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