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Transcript of Understanding EKGs
Defibrillation vs. Cardioversion
Defibrillation is a non-synchronus pulse of electricity that 'jolts' the heart into a normal rhythm
Basics of Cardiac Electrophysiology
Electrical impulses begin at SA node, travels distally through the AV node; depolarizes AV bundle branches and Purkinje fibers
SA node and AV node are modulated by Vagus nerve and PNS
Rhythm and Conduction
PART OF CONDUCTION SYSTEM RATE
SA node 60-100 times/min
AV node 40-60 times/min
Bundle of His, Purkinje fibers 20-40 times/min
In the absence of nervous system innervation, the cardiac electrical foci are
Remember that normal pulse rate is 60 to 100 bpm
Are they symptomatic?
Is there an abnormal tracing?
Are their VS abnormal?
Tachycardia and Bradycardia
Second Degree Type II
Both may cause symptoms, or may not
Premature ventricular contraction
Do not shock- start CPR immediately!
Cardioversion is a synchronized pulse of electricity that paces the rhythm of the heart to a normal rate
0.5mg IV q.3-5 mins up to 6mg.
300mg IV x1
1mg IV q.3-5 mins with no max
Dosage varies (situation dep.)
1-2 grams IV x1
1-6mg/min IV (situation dep.)
40 units IV x1