EXAM WITH ANSWERS
Heart blocks - answer-No changes in PR
Interval
- QRS complexes present = 1st degree
- No QRS complexes = 2nd degree type II
Blood flow through the heart - answer-SVC -->
Rt atria --> Tricuspid --> Rt ventricle -->
Pulmonic valve --> Lungs --> Lt atria --> Mitral
valve --> Lt ventricle --> aortic valve --> aorta --
> Body
EKG Times - answer-6 second strip
1 small block = 0.04 secs
1 big block = 5 small boxes = 0.20 secs
15 big blocks = 3 seconds
, P Wave - answer-atrial depolarization
PR Interval - answer-time it takes for the
impulse to get from atrial to ventricles
0.12 - 0.20 seconds
QRS Interval - answer-ventricular
depolarization
< 0.12 seconds
ST Segment - answer-early depolarization of
ventricles
depression = myocardial infarction
elevation = myocardial injury
T Wave - answer-repolarization of ventricles
Changes in PR Interval
- R to R interval regular = 3rd degree