CRAT Study Guide: ECG Interpretation Questions and Answers, Exams of Nursing

Download CRAT Study Guide: ECG Interpretation Questions and Answers and more Exams Nursing in PDF only on Docsity! CRAT Study Guide Normal PRI interval - correct answer 0.12-0.20 Normal QRS interval - correct answer 0.11 or less What does the P wave represent? - correct answer Atrial depolarization What does the QRS complex represent? - correct answer Atrial repolarization and ventricular depolarization Q wave indicates what? - correct answer Dead myocardial tissue. Always a negative deflection What is the natural pacemaker of the heart? - correct answer SA node 3 types of pacemakers - correct answer 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? - correct answer First- degree AV block (prolonged PRI >0.20 seconds) Define intrinsic beats - correct answer The patient's own heart beat What is sensing? - correct answer The ability for the heart to sense and respond to the electrical activity of the heart What is capture? - correct answer The pacemaker sends a stimulus to the heart which causes the heart to depolarize Failure to sense - correct answer Lack of pacemaker spikes where they should have been. Battery can be dead. Failure to capture (loss of capture) - correct answer No P or QRS after the pacemaker spike Undersensing - correct answer 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 - correct answer Cardioversion: to change the heart rhythm (usually from SVT to sinus) Defibrillation: only used for pulseless VT and v-fib Pacemaker inhibition - correct answer Pacemaker doesn't work because it senses the heart is beating at or above the programmed rate A-V sequential pacing - correct answer When the pacemaker paces both the atrium and the ventricle No pacemaker spikes is... - correct answer Failure to sense Pacemaker spikes with no P wave or QRS following it... - correct answer Failure to capture