Chapter 4 - Atrial Rhythms
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8 Terms
What does PACS stand for?
Premature Atrial Complexes
What are PACS?
When an irritable site within the atria discharges before the next SA node impulse
How is PACS recognized?
Atrial and ventricular rate usually normal (60-100)
P waves - premature
PR interval - Normal or prolonged
QRS - 0.11 sec or less
What are Aberrantly Conducted PACS?
PACs associated with a wide-QRS complex
What causes PACS?
Stimulants: caffeine, tobacco, cocaine
sympathomimetic medications, like epinephrine
Electrolyte imbalance
Stress
What is done with PACS?
Usually doesn’t require treatment
If frequent, treat the underlying cause: Correct e
What is a non-conducting PAC?
Only a P wave may be seen with no QRS after the pulse