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CV II Exam 1 > Rapid EKG I > Flashcards

Rapid EKG I Flashcards

1
Q

SA node

A

sinus node
-pacemaking automaticity

upper posterior wall of right atrium

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2
Q

contraction

A

wave of Na ions

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3
Q

AV node

A

between tricuspid and mitral valve
-only way electricity from atrium to ventricles

-conduction is slowed - to allow ventricular filling

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4
Q

slow conduction through AV node

A

calcium ions

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5
Q

purkinje fibers

A

His bundle
R and L bundle branches

-conduction Na ions

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6
Q

terminal purkinje fibers

A

spread out beneath endocardium

-go toward epicardium

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7
Q

Q wave

A

first downward deflection

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8
Q

R wave

A

upward deflection

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9
Q

S wave

A

downward deflection following R wave

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10
Q

QS wave

A

no R wave (no upward)

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11
Q

ST segment

A

end of QRS to beginning of T

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12
Q

ventricular repolarization

A

occurs ST segment and S wave

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13
Q

QT interval

A

beginning of QRS to end of T

-indicator of repolarization

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14
Q

myocyte contraction

A

Ca ion inflow

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15
Q

repolarization of myocytes

A

K outflow

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16
Q

cell-to-cell fast conduction

A

Na ion movement

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17
Q

AV node slow conduction

18
Q

small square

19
Q

large square

20
Q

lead I

21
Q

lead II

A

+60 degrees

22
Q

lead III

A

+ 120 degrees

23
Q

lead AVF

A

+90 degrees

24
Q

lead AVL

A

-30 degrees

25
Q

lead AVR

A

-150 degrees

26
Q

inferior limb leads

A

II, III, AVF

27
Q

lateral limb leads

28
Q

center of horizontal plane

A

chest leads - from AV node

29
Q

right chest leads

30
Q

left chest leads

31
Q

IV septum leads

32
Q

symapthetics

A

NE to beta1 adrenergic

  • increased SA node pacing
  • increased conduction rate
  • increased inotrophy
  • increased irritability of foci**
33
Q

parasympathetics

A

ACh to cholinergic receptors

  • decreased SA node pacing
  • decreased conduction rate
  • decreased inotropy
  • decreased irritability of atrial and junctional foci**
34
Q

decreased irritability of atrial and junctional foci

A

PS innervation

35
Q

constriction of arteries

A

sympathetic to alpha1

36
Q

syncope

A

severe vagus response

  • dilated arteries and bradycardia
  • loss of consciousness

vaso-vagal syncope

37
Q

vagal maneuvers

A

gag or carotid massage

  • increase PS
  • inhibit irritable foci
  • inhibit AV node (longer refractory)
38
Q

standing

A

sympathetic response

  • baroreceptors sense low BP
  • vasoconstriction
  • and SA node stimulation
39
Q

orthostatic hypotension

A

failure of compensatory sympathetic response when standing

40
Q

neuro-cardiogenic syncope

A

in elderly

  • prolonged standing
  • stimulates sinus pacing
  • vasoconstriction falls
  • paradoxical PS reflex
  • slows SA node and causes vasodilation

CV II Exam 1 (10 decks)

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