EKG and dysrhythmias Flashcards
1
Q
normal sinus rhythm
A
- HR 60-100/min
- regular rhythm (< 0.12 sec var.)
- P waves look alike
- PR interval: 0.12-0.2 sec
- ever P followed by QRS
- QRS < 0.12 sec
- QT interval < ½(R-R interval)
2
Q
sinus bradycardia
A
HR < 60 bpm
3
Q
sinus bradycardia origin
A
SA node
4
Q
sinus bradycardia in athletes
A
- normal
- result of stronger myocardial ctx
5
Q
symptomatic sinus bradycardia
A
- → lethal ventricular dysrhythmias
- Tx
- atropine
- pacemaker
6
Q
How does atropine treat symptomatic sinus bradycardia?
A
blocks parasympathetic innervations to SA node
7
Q
sinus tachycardia
A
- HR 100-150 bpm
- → angina if ↓ CO affects coronary circulation
8
Q
sinus tachycardia Tx
A
- aimed at relieving cause of ↑ HR
- imagery
- distraction
- meds
- pacemaker (in atrial dysfunction)
9
Q
Tx for sinus tach
A
- anxiolytic
- analgesic
- antipyretic
- O2
- fluids
- valsalva maneuver
- CCBs
- BBs
10
Q
atrial dysrhythmias
A
- originate from ectopic impulses in atria
- types
- premature atrial ctx (PACs)
- supraventricular tachycardia (SVT)
- atrial flutter (Aflutter)
- atrial fibrillation (Afib)
11
Q
PAC
A
premature atrial ctx
12
Q
premature atrial ctx
A
- common type of premature beat that originates from 1 or more ectopic pacemakers in the atria
- multifocal: > 1 ectopic pacemaker
- often changes contour of T wave
13
Q
bigeminal PAC
A
every other beat
14
Q
trigeminal PAC
A
every third beat
15
Q
couplet PACs
A
two at a time
