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CRAT Study Guide With Correct Answers.

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CRAT Study Guide With Correct Answers. Normal PRI interval - ANS 0.12-0.20 Normal QRS interval - ANS 0.11 or less What does the P wave represent? - ANS Atrial depolarization What does the QRS complex represent? - ANS Atrial repolarization and ventricular depolarization Q wave indicates what? - ANS Dead myocardial tissue. Always a negative deflection What is the natural pacemaker of the heart? - ANS SA node 3 types of pacemakers - ANS 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? - ANS First-degree AV block (prolonged PRI 0.20 seconds) Define intrinsic beats - ANS The patient's own heart beat What is sensing? - ANS The ability for the heart to sense and respond to the electrical activity of the heart What is capture? - ANS The pacemaker sends a stimulus to the heart which causes the heart to depolarize Failure to sense - ANS Lack of pacemaker spikes where they should have been. Battery can be dead. Failure to capture (loss of capture) - ANS No P or QRS after the pacemaker spike Undersensing - ANS 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 - ANS Cardioversion: to change the heart rhythm (usually from SVT to sinus) Defibrillation: only used for pulseless VT and v-fib

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