Download - ECG Dysrhythmias
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ECG Dysrhythmias
Updated March 2006: D. Tucker, RPh, BCPS
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Ov
erv
iew
ECG waveforms
Normal sinus rhythm Asystole
Bradycardia
Ventricular fibrillation Ventricular tachycardia
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ECG Rhythm Strip
Electrocardiogram or ECG is used to
measure the activity of the heart
ECG is used to represent the conduction of
electrical impulses from the atria to the
ventricles
ECG is used to characterize rhythms and
conduction abnormalities of the heart
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ECG Wav
eforms
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Normal Sinus Rhythm
Normal impulse conduction through the
heart
Normal sinus rhythm (NSR) is the standard
against which all other rhythms are
compared
NRS contains no ectopic or aberrant beats
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ECG Rhythms
Normal sinus rhythm
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ECG Rhythms
Asystole
Bradycardia
Ventricular
fibrillation
Ventriculartachycardia
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Asystole Asystole is a cardiac standstill, i.e., flatline
Asystole is the absence of electrical activityin the venticles
Asystole usually results from a prolongedperiod of cardiac arrest without
resuscitation Asystole usually means the patients life has
ended
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ECG Rhythms
Ventricular asystole
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Bradycardia Bradycardia is when the heart is < 60 beats/minute
or when the heart rate is slower than expected
Sinus bradycardia usually occurs as a response to
a reduced demand for blood flow
Signs and symptoms might include:
Chest pain, shortness of breath Hypotension, pulmonary edema, congestive heart
failure
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ECG Rhythms
Sinus bradycardia
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Ventricular Fibrillation
Ventricular fibrillation (VF) occurs as aresult of electrical impulses coming from
multiple ectopic pacemaker in the ventricles
VF results in no cardiac output as a result ofproducing no effective ventricular
contractions With VF the ventricular muscle quivers
instead of contracting
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ECG Rhythms
Ventricular fibrillation
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Ventricular Tachycardia
Ventricular tachycardia (VT) is a result of 3or more ventricular contractions occur
earlier than expected resulting in aventricular rate of >10 beats/minute
VT usually preceeds VF
Causes of VT include myocardial ischemia,heart failure, drug toxicity fromprocainamide, quinidine, or cocaine
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ECG Rhythms
Ventricular tachycardia
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ECG Rhythms
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