🩻ECG

Question 1

Automaticity

Answer 1

ability of heart cells to generate action potential

Question 2

Conductivity

Answer 2

ability for cardiac cells to transmit action potential

Question 3

Rhythmicity

Answer 3

cardiac cells to generate an action potential in a regular rate

Question 4

SA node rate

Answer 4

60-100 beats/min

Question 5

AV node rate

Answer 5

40-60 beat/min

Question 6

Purkinje fibers

Answer 6

15-40 beat/min

Question 7

P wave

Answer 7

artial depolarization/contraction
SA firing

Question 8

PR interval

Answer 8

time from onset art depo to vent depo

Question 9

QRS interval

Answer 9

Art repo/vent depo
Impulse through bundle branches down purkinje

Question 10

J point

Answer 10

point after QRS when returns to isoelectric line

Question 11

ST segment

Answer 11

end of QRS to beginning of T wave

Question 12

Elevated ST

Answer 12

STEMI

Question 13

ST depression

Answer 13

NSTEMI

Question 14

T wave

Answer 14

vent repo
influenced potassium

Question 15

QT interval

Answer 15

time from vent depo to vent repol
Q to end of T (at isometric line) ~ 40 seconds

Question 16

Systematic Approach

Answer 16

calculate rate, regularity, rhythm

Question 17

Regularity

Answer 17

R to R, P to P

Question 18

PR interval

Answer 18

0.12 - 0.2 sec 3-5 little boxes

Question 19

QRS interval

Answer 19

<0.12 less than 3 boxes

Question 20

What can prolong QT interval

Answer 20

amiodirone

Question 21

First degree AV block

Answer 21

P interval longer than >0.20

Question 22

Bundle Branch Black BBB)

Answer 22

> 0.12 prolonged QRS interval

could indicate previous MI

Question 23

Artifact

Answer 23

different strip, reposition, pulm treatment

Question 24

Normal Sinus Rhythm

Answer 24

Impulse 60-100
P wave present
PR interval within .12-.20
QRS is narrow <0.12s seconds

Question 25

Bradycardia

Answer 25

HR <60
common athletes
sleep, sever pain, MI, spinal cord injury (widowmaker causes bradycardia)

Meds: digitalis, beta blockers, calcium channel blocker

Question 26

Bradycardia treatment

Answer 26

assess BP, AxO, angina?

Meds - atropine 1.0mg IV if symptomatic q5m

if ineffective TCP, dopamine/epi

Question 27

Sinus Tachycardia

Answer 27

> 100bpm

increase sympathetic tone (stress, exercise, stimulants)
fever, anemia, hyperthyroidism, hypoxemia, heart failure, shock

Meds: atropine, catecholamines

Question 28

Treatment for tachycardia

Answer 28

Assess BP, axo, angina, treat cause

Meds: Beta-blocker/calcium channel blocker to decrease HR

Question 29

Sinus Dysrhythmia

Answer 29

RR intervals irregular >0.12 seconds
increases with inspiration and gradually decreases with expiration