Three or more successive PVCs are called nonsustained ventricular tachycardia.
These can be common
Atrial Flutter
Rapid atrial depolarization
PAC stands for
premature atrial contraction
PACs are
when atrium fires impulse before the next one comes, and is usually followed by a pause. There are rarely other symptoms associated with this. Can be caused by stress or inflammation
SVT stands for
Supraventrical Tachycardia
SVT is
may be normal
P waves may not be visible
PSVT = intermittent
Atrial Fibrillation
The most common dysrhthmia
Atrium is depolarized randomly
With AFib, pt is at risk for
pulmonary embolis
Normal QRS Duration
0.04-0.1
Normal PR interval
0.12-0.2
Analyzing P waves
Are They present?
DO they occur regularly?
Is there one P wave for each QRS?
Are they smooth, rounded, and upright?
Are they all similar looking?
ECG rhythm analysis
Determine HR
Determine Heart Rhythm
Analyze P waves
Measure PR interval
Measure QRS duration
interpret rhythm
Sinus arrhythmia
pretty normal
results from changes in intrathoracic pressure while breathing
PP and RR intervals vary by more than 0.12 seconds
Memory Method
300
150
100
75
60
50
43
37
33
30
QT Interval
total time for ventricals to depolarize and repolarize
QRS-Twave
U wave
late ventricular repolarization
T wave
represents ventricular repolarization
ST segment
early ventricular repolarization
J point
represents the junction where QRS ends and ST starts