NUR 254 Cardiac Dysrhythmias

NUR 254 Cardiac Dysrhythmias
1. What does the p wave measure?
Answer
Depolarization and contraction of the atria (problem with p wave is problem with the atria)
2. What is the PR interval measuring? Where is it measured from?
Answer
Time it is taking from SA impulse to purkinje fibers (time it takes for atrium to squeeze blood
into ventricles) - From P to Q
3. What does the QRS complex measure?
Answer
Depolarization and contraction of the ventricles
4. What is the normal for the ST segment? What does it mean if it's elevated or depressed?
Answer
- Has to be the same level as the isoelectric line
- If elevated = infarct
- If depressed = injury
5. What doestheT wave measure?
Answer
Repolarization of the ventricles(inverted with injury; peaked with hyperkalemia)
6. (T/F) A heart block is a physical blockage.
Answer
False (It's a block in conduction)
7. Where do you count from to tell if it's a regular rhythm?
Answer
R to R