ECG Exam 1 Questions with 100% Correct Answers | Verified | Updated 2024

ECG Exam 1 Questions with 100% Correct Answers | Verified | Updated 2024 Normal sinus rhythm - answer60-100 bpm True or false Electrical event happens first followed by mechanical beat - answertrue The normal pacemaker of the heart is the - answerSA node (inside right atrium) If the SA node were to fail what node takes over? - answerAv Node If the AV node fails - answerIt goes to bundle of His which breaks into the right nd left bundle branch which goes off into the purkinje fibers that penetrate the ventricles ECG - answerhelps diagnosis cardiac arrhythmias The monitor can be set to view the heart in LEAD I Lead II Lead III (seen in the ICU) - answerLead II is the best (right side: from upper to lower end of body) Lead 12 to 15 (10 patches) - answerShowing what is occurring in the exact moment for diagnostic purposes (normally taken in the ER or on a patient that is suspected of heart attack heart block stemi ) Chest leads (pre cordial Leads) - answerV1 and V2- 4th intercostal space (right V1 and left V2) V4 - 5th intercostal space V3 - 5th intercostal (between V2 and V4) V5 and V6- are at the anterior and midaxillary lines 5th intercostal space (left side) 1 single box is showing - answer0.04 seconds 5 boxes is showing - answer0.20 seconds Normal PR interval = - answer0.12-0.20 sec from the beginning of the p wave to the beginning of the QRS wave 5 large squares is showing - answer1 second P wave - answerfirst positive wave -produced by atrial depolarization Normal duration: 0.08-0.12 seconds (2 1/2 small boxes) STEMI - answerST (segment) elevated myocardial infarct ST segment (urgent if elevated: Stemi - answerShould be flat (ISO electric) if elevated a STEMI is present QRS complex - answerProduced by ventricular depolarization Q wave first negative deflection of the complex) (not normally seen) R wave : Positive wave that follows the Q wave S wave : Negative wave that follows the R wave T wave - answerPositive wave that follows