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Physiology Exam 2 > interpreting EKG > Flashcards

Flashcards in interpreting EKG Deck (21):
1

vertical square is worth

.1mb

2

horizontal square is worth

.04 seconds

3

waveform tells you what two things

HR and heart rhythm

4

how to tell HR

# seconds beween RR or PP (.8 normal)
or 300/ # large blocks

5

what to tell about rhythm

where is pacemaker? what is conduction path? is pacemaker speed regular?

6

cardiac arrhythmia- normal

sinus tachy, sinus Brady, sinus arthymia

7

sinus arrhythmia

small changes with respiratory cycle- increases with inspiration. decreased with vagal tone

8

pathologic arythmias are usually due to

conduction defects- block (tissue death from heart attack) anoxia/ischemia (can't maintain resting potential)

9

what happens during a block

action potential blocked by changes in Na/Ca flow

10

AV block

1st, 2nd, or 3rd degree

11

first degree AV block

delayed SA> AV, increased PR interval, slower ventricle depolarization

12

second degree AV block

intermittent block, some imposes ARE conducted. Two types- Mobitiz I and II

13

third degree AV block

complete block, AV node stops SA node, disassociated results in two pacemakers. irregular p waves, QRS distortion when they overlap

14

Mobitz I

increased PR until a beat is skipped, usually third or fourth

15

Mobitz II

PR is constant, every Nth is skipped

16

bundle branch block

anywhere along branches. More common. L or R, will look different impulse forced to travel cell to cell, which is slow, increased QRS

17

LBB

fat QRS

18

RBB

two peaks

19

wolff Parkinson white syndrome

bundle of Kent is an accessory conduction. Bipasses AV node, creates a delta wave in the q

shorter PR

atria to ventricle signal is biphasic!

20

A fib

multiple activation sites, no P wave, irregular QRS, no unit contraction so no resting p

21

Vfib

no cardiac output, no coordinated v depolarizations, pacemakers are ALL over