EKG STUDY MATERIAL FOR ADVENTHEALTH Exam Questions With Verified Answers

EKG STUDY MATERIAL FOR ADVENTHEALTH Exam Questions With Verified Answers 3 pacemakers of the heart - answer1. SA node 2. AV node 3. bundle branch intrinsic rate of SA node - answer60-100 bpm intrinsic rate of AV node - answer40-60 bpm intrinsic rate of bundle branches - answer20-40 bpm electrical pathway through the heart - answer1. normal conduction impulse originates in the *SA Node* 2. impulse travels to *AV Node* causing atrial depolarization (contraction) 3. AV Node slightly delays impulse then sends impulse to *Bundle of HIS* 4. then travels to *Bundle Branches* 5. impulse continues down to the *Purkinje Fibers* causing ventricular depolarization (contraction) P wave - answeratrial depolarization (contraction) PR interval - answerdelay of AV node to allow filling of ventricles QRS complex - answerventricular depolarization (contraction) ST interval - answerventricular repolarization (resting phase) QT interval - answerventricular depolarization and repolarization inversely related to the heart rate normally less than half of the length of the R-R interval T wave - answerventricular repolarization (resting phase) isoelectric line - answerThe baseline of the ECG / absence of electrical activity positive deflection - answera wave that exists above the isoelectric line negative deflection - answera wave that exists below the isoelectric line absolute refractory period - answercardiac cells will not respond to further stimulation myocardial cells will not contract electrical cells will not conduct relative refractory period - answervulnerable period cardiac cells can be stimulated to contract notched P wave - answer peaked P wave - answer inverted P wave - answer depressed ST segment - answerindicates myocardial ischemia elevated ST segment - answeracute myocardial infarction tall T wave - answerhyperkalemia inverted T wave - answermyocardial ischemia hyperacute T wave - answerSometimes the earliest presentation of MI 1 small box on EKG = - answer0.04 seconds 1 big box on EKG = - answer0.20 seconds 5 big boxes on EKG = - answer1 second 30 big boxes on EKG = - answer6 seconds normal PRI measurement - answerfrom the beginning of the P wave to the beginning of the first deflection of the QRS complex *NORMAL = 0.12 - 0.20* normal QRS measurement - answerfrom the beginning of the first deflection of the QRS complex to the last deflection of the QRS complex *NORMAL = 0.04 - 0.10* Lead II on EKG - answernegative → positive deflection QRS is pointing up MCL (modified chest lead) - answerpositive → negative deflection QRS is pointing down steps in analyzing a rhythm strip - answer1. *rhythm* - atrial and ventricular -regular or irregular? -map out all the P waves 2. *rate* - atrial and ventricular - 1500 rule or 6 second rule -are P's and QRS's married? -look for hidden p waves 3. intervals