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Critical Care Nursing (NSG 472) EKG Study Guide

John Marsh
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EKG Study Guide – Summary Critical Care Nursing

DePaul University

Critical Care Nursing (NSG 472)

Atrial Dysrhythmia
 Increased automaticity in the atrium, cause irregular and rapid heart rates, generally have p wave changes
 Include: premature atrial contractions, PSVT paroxysmal supraventricular tachycardia, atrial tachycardia, atrial
flutter, atrial fibrillation
 Causes: stress, e-, hypoxia, atrial injury, digitalis toxicity, hypothermia, hyperthyroidism, alcohol, pericarditis,
non cardiac surgeries
 Tx: cause, prompt electrical cardioversion, adenosine 6 mg IV (fast), plus another 12 mg IV push if required
o Diltiazem 15-20 mg IV over 2 minutes followed by 5-15 mg/hr SVTs
o For atrial fibrillation esmolol (rapid onset and short duration)
o Amiodarone, if B blocker are contraindicated
Premature Atrial Contractions
 Rate= varies can occur at any
 Rhythm= irregular
 P wave and QRS exist
 P waves all look the same except the P in front of the PAC will be different P wave is buried in the
proceeding T wave
 Cause: emotions, tobacco, alcohol, caffeine, rheumatic heart disease, ischemic heart disease, mitral stenosis,
HF, hypokalemia, hypomagnesemia, medications, hyperthyroidism, atrial irritability
 Usually asymptomatic, may feel a pause or skipped beat, could lead to a fib
 No treatment
Supraventricular Tachycardia
 General term used to describe any narrow tachycardia
 Includes: PSVT, atrial tachycardia, multifocal atrial tachycardia, atrial flutter with 2:1 conduction, junctional



Critical Care Nursing (NSG 472) EKG Study Guide

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