Dysrhythmias Flashcards Preview

Med Surg IV > Dysrhythmias > Flashcards

Flashcards in Dysrhythmias Deck (53):
1

Pacemaker of the heart

SA node

2

Atrial depolarization

SA node to AV node
Contraction of atrium

3

Ventricular depolarization

AV node to Bundle of His to Purkinje fibers
Contraction of ventricles

4

Calculate heart rate on EKG strip

Between R to R waves in 6 seconds (FULL cycle) and multiply by 10

5

Small box

0.04 seconds

6

Big box

0.20 seconds

7

PR interval

0.12-0.20 seconds

8

QRS interval

<0.12 seconds

9

QT interval

0.34-0.43 seconds

10

Straight line on EKG

isoelectric line

11

What does the isoelectric line mean?

NO electrical conduction

12

Above isoelectric line

Positive deflection

13

Below isoelectric line

Negative deflection

14

What does the PR interval represent?

Atrial depolarization
(SA node to AV node)

15

What does QRS interval respresent?

Ventricle depolarization
(AV node to Bundle of His to Pukinje fibers)

16

What does T wave represent?

Ventricular repolarization

17

Normal sinus rhythm

60-100 bpm

18

Sinus Bradycardia

<60 bpm

19

Bradycardia is normal in people who are....

aerobically trained athletes and sleeping

20

Bradycardia =

decreased cardiac output

21

S/S bradycardia

-hypotension
-pale, cool skin
-weakness
-angina
-dizziness
-confusion
-SOB

22

Sinus tachycardia

101-200 bpm

23

If unable to measure something, document as...

non discernible or unable to assess (UTA)

24

Treatment for bradycardia

Atropine

25

Normal causes of tachycardia

-exercise
-pain
-hypovolemia
-fever

26

Bad causes of tachycardia

-MI
-Heart failure

27

sawtooth-shaped waves on EKG

atrial flutter

28

Single ectopic focus =

irritable

29

What is used to stop or rest irritable behavior in atrial flutter?

synchronized cardioversion

30

What does a single ectopic focus represent?

Atrial flutter

31

True or False:

EKG will show P wave during atrial flutter

FALSE

EKG will NOT show P wave during atrial flutter

32

Treatments for atrial flutter

-synchronized cardioversion

-calcium channel blockers or beta blockers

-antidysrhythmias (amiodarone)

-coumadin

33

What effect does calcium channel blockers or beta blockers have on the heart?

decrease heart rate

34

What is the most common dysrhythmia?

Atrial fibrilation

35

True or False

Atrial fibrilation has just 2 ectopic focus spots

False.

Atrial fibrilation has mutiple ecoptic focus spots.

36

What does atrial fibrilation look like on an EKG?

bunch of squiggly lines

37

If pt has been in a fib for >48 hours, warfarin is recommended for ___ _____ before cardioversion and for ___ _____ after successful cardioversion.

3-4 weeks

4-6 weeks

38

Treatment for atrial fibrilation

-synchronized cardioversion (depending on when a fib started)

-Dig, beta blockers, calcium channel blockers

-Coumadin

39

What is a premature ventricular contraction (PVC)?

-contraction in ectopic focus of ventricle

-early and wide QRS complex

40

What should you do FIRST with a PVC?

Check vital signs

41

Multifocal PVC

different spots

42

Unifocal PVC

one spot

43

Ventricular bigeminy

every other

44

Ventricular trigeminy

every 2

45

Couplet

2 in a row

46

Ventricular tachycardia

3 or more in a row

47

Low potassium (K) =

irritability to heart, especially ventricles

48

R on T

the heart isn't fully relaxing during T wave on EKG strip.

49

What can R on T lead to?

lethal dysrhythmias

50

Treatment for PVCs

(based on cause)

-O2
-electrolyte replacement
-beta blockers, antidysrhythmias, lidocaine

51

Monomorphic ventricular tachycardia

1 focal point, same shape

52

Polymorphic ventricular tachycardia

Different shape

53

2 types of ventricular tachycardia

stable-with pulse

unstable-no pulse