Exam 2 Study Guide Critical Care
Chamberlain College Of Nursing
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RN Exam 2 Study Guide-Critical Care STUDY REVIEW
Basic Electrophysiology 
•	Automaticity-The ability for the heart muscle to generate it's own electrical activity 
o	Pacemaker Cells arise naturally from the SA Node 
o	Electrolytes involved are K+, Na+, & Ca+ 
Cardiac Action Potentials 
•	Depolarization-occurs when charge is more (+) 
o	P wave=atrial depolarization 
o	QRS complex=ventricular depolarization 
o	contraction 
o	Systole 
•	Repolarization-recharging period when charge is more (-) 
o	T wave=ventricular repolarization 
o	filling...
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