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Flashcards in Dysrhythmias: Deck (70)
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1

Also called arrhythmias
Abnormality of the cardiac rhythm of impulse generation or conduction

Cardiac Dysrhythmias

2

Dysrhythmias are significant for two reasons:

Indicate an underlying pathophysiologic disorder
May impair normal CO

3

ECG recordings allow measurement of waveform _____, _____, and ________

amplitude, duration, HR

4

Impulse rate between ____and ____beats/minute for normal sinus rhythm

60 and 100

5

Normal sinus rhythm has ______ rhythm

normal

6

Normal Sinus Rhythm
Starts in the ______node and follows the ____ pathway

SA; normal

7

P wave precedes every QRS complex

Normal Sinus Rhythm

8

PR, QRS, QT intervals are of normal duration

Normal Sinus Rhythm

9

Sinus Tachycardia manifested by abnormally fast heart rate of greater than _____beats/minute

100

10

Sinus Tachycardia is usually a compensatory response to increased demand for ____ or reduced _______

CO; SV

11

Sinus Tachycardia usually occurs from _______ activation

SNS

12

Treatment aimed at correcting underlying cause; sympatholytic agents or calcium-channel blocking agents may be indicated

Sinus Tachycardia

13

In Sinus Bradycardia, HR may be lower than _____beats/min

60

14

Sinus Bradycardia usually from ______ activation

parasympathetic

15

If slow HR precipitates low CO, treatment includes sympathomimetic or parasympatholytic drugs

Sinus Bradycardia

16

Associated with fluctuations in autonomic influences and respiratory dynamics

Sinus Arrhythmia

17

Sinus Arrhythmia may be pronounced in _____

children

18

Sinus Arrhythmia is _______ and needs _____ treatment

normal; no

19

Must be differentiated from sick sinus syndrome
May need a pacemaker

Sinus Arrhythmia

20

In sinus arrest, absence of impulse initiation in the heart results in electrical _______

asystole

21

_____ rhythm: a slower pacemaker will generally begin to fire after several seconds of sinus arrest
Pacemaker may be required in ________

Escape; Sinus Arrest

22

Initiation of cardiac impulse at a site other than the SA node can occur with (2)_________

SA node failure: allows a slower pacemaker to take over (escape rhythm)
Enhanced excitability, triggered activity or reentrant circuits may cause a premature depolarization and override the SA node

23

Escape Rhythms originate in the _____ nodal region or ventricular _____ fibers

AV; Purkinje

24

Junctional escape rhythm originates in the_______ (rate of ________beats/minute with normal QRS)

AV node; 40-60

25

Ventricular escape rhythm originates in _______(rate of _______beats/minute with abnormally wide QRS)

Purkinje fibers; 15-40

26

The _______ wave is abnormal/absent in escape rhythms

P

27

Premature atrial complexes (PACs) associated with ______

Atrial Dysrhythmias

28

PAC's Originate in the _____ but not the SA node

atria

29

PACs occur earlier than ______, preceded by a ____ wave, and have a normal______ complex configuration

normal; P; QRS

30

Frequent _____ may indicate underlying pathophysiologic process and be precursors to more serious dysrhythmias

PACs