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CV exam 1 wk 2 > ECG > Flashcards

ECG Flashcards

1
Q

Paper speed

A

25mm/sec

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2
Q

Light lines

A

(1mm) 0.04 sec

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3
Q

Heavy lines

A

(5mm) 0.2 sec

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4
Q

HR =

A

= 300 ÷ # heavy lines between 2 QRS’s

HR= 1500 ÷ # mm between 2 QRS’s

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5
Q

Leads are

A

electrodes which measure the difference in electrical potential

  1. bipolar
  2. unipolar
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6
Q

bipolar leads measure

A

the difference in electrical potential between two different points on the body (bipolar leads)

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7
Q

unipolar leads meaure

A

the difference in electrical potential between one point on the body and a virtual reference point with zero electrical potential, located in the center of the heart (unipolar leads)

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8
Q

polarity is

A

depolarization moving toward a positive electrode produces a positive deflection

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9
Q

QRS is ____ in left and lateral lead

A

upright +

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10
Q

QRS is ____ in right sided lead

A

downward -

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11
Q

_____ monitor the RV


A

Right chest leads (V1 &V2)

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12
Q

____ monitor the LV

A

Left chest leads (V5 & V6)

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13
Q

ventricular hypertrophy

A

More muscle = more volts = greater amplitude

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14
Q

Left Ventricular hypertrophy

A

Big R waves in Left-sided Leads

I, aVL, V5, V6

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15
Q

Right Ventricular hypertrophy

A

Big R waves in Right-sided Leads

V1,V2

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16
Q

EKG and coronary artery disease

A
  1. ischemia
  2. injury
  3. infarct
17
Q

Ischemia occurs when

A

blood supply is insufficient to meet oxygen demand in the ventricles

18
Q

Ischemic changes in the EKG alter

A

ventricular repolarization and affect the ST segment and the T wave

19
Q

Ischemia due to sudden high oxygen demand in the presence of fixed coronary obstruction will result in:

A

depression of the ST segment

20
Q

Ischemia due to acute coronary artery obstruction during low oxygen demand will result in:

A

T wave inversion

21
Q

stress induced myocardial ischemia

A

increased oxygen consumption with inability to increase coronary flow appropriately

22
Q

ischemia during acute coronary syndrome

A

ischemia due to decreased coronary flow without increased oxygen consumption

23
Q

transmural infarcts produce

A

Q waves

24
Q

absence of noraml transmural vector produces a

A

negative deflection in leads over infarcted myocardium

25
Q

a significant Q wave is

A
  1. is ≥ one fourth the amplitude of the R wave.
  2. is ≥ one small box (0.04 seconds) wide.
  3. is usually in at least 2 leads reflecting the same region of the left ventricle.
26
Q

Transmural

A

ST elevation with Q waves

27
Q

Subendocardial

A

ST depression no Q wave

28
Q

location of V1-V2

A

anteroseptal wall

29
Q

location of V3-V4

A

anterior wall

CV exam 1 wk 2 (35 decks)

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