DMI 131 ECG Exam Prep 2025 Guide, Exams of Nursing

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DMI 131 ECG Exam Prep 2025 Guide

DMI 131 ECG Exam Prep 2025 Guide Regarding the electrocardiographic tracing, all of the following are true EXCEPT: A. Repolarization of atrial muscle cells is represented by the P wave. B. The QRS-complex represents depolarization of ventricular muscle cells. C. The S portion of the QRS complex represents a return to the baseline (isoelectric point). D. The U wave is theorized to represent repolarization of the papillary muscles and Purkinje fibers. - CORR ANSWER-A When multiplying heart rate times stroke volume, the product is: - CORRECT ANSWER cardiac outpul, Depending on the cause and severily of an arrhythmia, Ireatment may include which of the following? A\. Cardiae pacemakers or ICD devices B. Ablation therapy C. Cardioversion cxlornal shock therapy D. all of the above - CORR: systolic pressures greater than __ mm Hg generally ensure adequate perfusion of tissues - CORRECT ANSWER-90 rhythmic contraclion and relaxation of the chambers of the heart are controlled by principal cell types to include which of the following? 1. working cardiac cells 2. specialized neural conductive cells 3. striated muscle cells - CORRECT ANSWER-1,2 all of the following are true of atrial fibrillation EXCEPT: A. its always fatal B. it is caused by additional ectopic pacemaker firings in the atria that can exceed SA node firings C. the atria syncytium quivers instead of fully contracting D. formation of atrial emboli is a potential complication - C\ ANSWER-A To ensure a normal scquenee Lor cach cardiac cycle, cach P wave should be followed by a: - CORRECT ANSWER-QRS complex When the resting membrane potential is reversed, __ occurs and myocardial cells are stimulated La contract. - CORR! ‘ER-Depolarization All of the following are visible on an ECG tracing EXCEPT: A. Depolarization of the atrial muscle B. Atrial contraction C. Depolarization of the ventricular muscle INSWER-B For analysis of an ECG tracing, which of the following below indicates regular rhythm? 1. QRS complexes (RR intervals) are consistent for evaluating ventricular rhythm. 2. The duration of the QRS complex exceeds 0.20 seconds (five small squares on the ECG) Which part of the conduction system receives an impulse from the SA node but delays relaying that impulse to the bundle of HIS, allowing time for the atria to empty their contents into the VER-AV node ventricles before the onset of ventricular contraction? - CORRE" On ECG paper, the time necessary for the spread of an electrical impulse through the atria, AV node, bundle of HIS, right and Iefi bundle branches, and the Purkinje fibers is refleeled by the: - CORRECT ANSWER-PR interval Tn a normal heart the pacemaker is the: - CORR! ANSWER-SA node All of the following are related EXCEPT: A. AV node B. PurkinJe fibers C. SA node D. Mitral valve - CORR! The mitral valve is nol part of the cardiac conduction system The polarity that exists across a cardiac cell membrane is maintained by an active transport process known as - CORRECT ANSWEF-sodium-potassium ion pump The cardiac arrythmia of bradycardia generally involves abnormalities to - CORRECT ANSWER-Tho SA node: and the atrioventricular node Referring to the choices below, the normal flow of electrical impulse through the cardiac conduction system of the heart follows what sequence of events? 1. Purkinje fibers 2. AV node 3. SA node 4. Bundle of His 3. Interventricular node (IV node) - SA node, AV node, bundle of HIS, purkinie fibers Part of your initial assessment of a patient's status should include assessment of body CORR! temperature by: ANSWEF- evaluating skin temperature by touch 110/70 mm Hg is a typical measurement for which of the following vital signs? - CORRECT A serum bilirubin test is used to measure: - CORRECT. contont in blood The normal heart rale for an adult. is: - CORRECT ANS When a heart rate is measured by placing a stcthoscape on the chest directly over the heart, this is called an: - CORRECT ANSWER Apical pulse The term tachycardia refers to: - CORR: Sinus rythm - CORRECT ANSWERNormal waveform= normal heart rate ANSWER-Rapid heart rate without any other deviations from normal Sinus Brachycardia cabnormally slow heart rate Premature ventricular contractions (PVCs} - CORRE’ contractions ventricular fibrillation - CORRECT A od ventricles can be fatal ifnotr ventricular lachycardia - CORRECT ANSWER-Pulse rale of more than 200 beats por mimic and at least ¢ rregular heartbeats in a row atrial fibrillation - CORRECT ANSWERP waves are absent