CRAT New Practice Questions and Answers | Complete Exam Prep Resource | A+ Pass Guaranteed

CRAT New Practice Questions and Answers |
Complete Exam Prep Resource | A+ Pass
Guaranteed
• What does the P wave represent? -✓✓Atrial depolarization

• What does the QRS complex represent? -✓✓Atrial repolarization and ventricular
depolarization

• Q wave indicates what? -✓✓Dead myocardial tissue. Always a negative deflection

• What is the natural pacemaker of the heart? -✓✓SA node

• 3 types of pacemakers -✓✓1) single (either RA or RV)
2) dual chamber (RA and LV)
3) bi-ventricular (RV and LV --> Congestive Heart Failure)

• Which HB would you NOT need a pacemaker for? -✓✓First-degree AV block
(prolonged PRI >0.20 seconds)

• Define intrinsic beats -✓✓The patient's own heart beat

• What is sensing? -✓✓The ability for the heart to sense and respond to the electrical
activity of the heart

• What is capture? -✓✓The pacemaker sends a stimulus to the heart which causes the
heart to depolarize

• Failure to sense -✓✓Lack of pacemaker spikes where they should have been. Battery
can be dead.

• Failure to capture (loss of capture) -✓✓No P or QRS after the pacemaker spike

• Undersensing -✓✓Pacemaker spikes in areas where they should not be (i.e. in the T
wave, an ST segment, or on top of another QRS)

• Cardioversion vs. Defibrillation -✓✓Cardioversion: to change the heart rhythm (usually
from SVT to sinus)

Defibrillation: only used for pulseless VT and v-fib