ECG Test Questions and Answers (Graded A)

Where does atrial depolarization occur? - ANSWER-P wave Atrial Repolarization? - ANSWER-Not seen on ECG strip Ventricular Depolarization? - ANSWER-QRS complex Ventricular Repolarization? - ANSWER-T wave Absolute Refractory period? - ANSWER-ST segment and front of t wave Relative refractory period? - ANSWER-Back of T wave Identify the normal sequence of flow for the heart's electrical conduction system - ANSWER-SA Node Internodal Pathway AV node/bundle of his Bundle branches Purkinje Fibers What is the intrinsic rate of Junctional Rhythm? - ANSWER-40-60 SA Node? - ANSWER-60-100 AV Node? - ANSWER-40-60 Ideoventricular rhythm? - ANSWER-20-40 A fib? - ANSWER-350 Sinus Tachy - ANSWER-100-150 Sinus Brady - ANSWER-60 Accelerated Junctional Rhythm? - ANSWER-60-100 Atrial Tachy - ANSWER-151-250 IVCD is characterized by a QRS of? - ANSWER-0.12 First degree Heart block is characterized by a PR interval of? - ANSWER-0.20 This sinus rhythm has a regular irregular pattern caused by the respiratory pattern: - ANSWER-Sinus Arrhythmia When the SA node fails to fire for a few seconds: - ANSWER-Sinus arrest/pause Identify the rhythm with the following: A narrow QRS, rate greater than 151, umbrella term for atrial junctional tachycardia: - ANSWER-SVT In this heart block, the ECG show no relationship between the P wave and QRS complex: - ANSWER-Complete heart block Which lead is the best lead to evaluate junctional rhythms? - ANSWER-Lead II This condition has an ECG rhythm but no pulse: - ANSWER-PEA T/F: Artifact can mimic ventricular fib - ANSWER-True The term SVT indicated that the stimulus occurs above the ventricles - ANSWER-true The difference seen on an ECG strip between V Fib and A Fib is that V Fib does not have normal QRS - ANSWER-True Junctional escape beats occur early - ANSWER-False For a rhythm to be identified as regular the R-R intervals must be within 2 small blocks - ANSWER-False The QRS waves of all premature ventricular complexes are usually 0.10 or less - ANSWER-False ECGs can determine the strength of heart contraction - ANSWER-False Adenosine is used to increase HR - ANSWER-False Oversensing is seen on an ECG strip by the pacer spike coming later after an intrinsic beat - ANSWER-True The saw tooth pattern is indicative of which rhythm? - ANSWER-A Flutter The heart block with extra P waves and a constant PR interval: - ANSWER-Mobitz II Undersensing is seen on an ECG strip by - ANSWER-The pacer spike coming early after an intrinsic beat An appropriate intervention for a symptomatic slow rhythm: - ANSWER-Pacing Which of the following is not a lethal rhythm: V Tach V Fib Ideoventricular Rhythm Accelerated ideoventricular rhythm - ANSWER-Accelerated ideoventricular rhythm Agonal rhythm is evidence by - ANSWER-PEA, irregular ventricular rhythm, pulseless In junctional rhythms, P waves may be: - ANSWER-inverted, absent, or after the QRS The difference between premature beats and escape beats is: - ANSWER-Escape beats are protective mechanisms to provide heart beat from a lower site in the conduction system failure to capture is treated by: - ANSWER-Increased electrical voltage (mA) Undersensing is treated by - ANSWER-Increased sensitivity Oversensing is treated by - ANSWER-Decreased sensitivity The ability to act as an impulse, initiating electrical activity and spontaneous depolarization: - ANSWER-Automaticity What is the most important difference between cardiac and skeletal muscle cells? - ANSWER-Automaticity The ability to respond to a stimulation and initiate an impulse: - ANSWER-Excitability The ability to transmit an impulse that has been initiated and passes along cell membranes: - ANSWER-Conductivity The ability of a muscle fiber to shorten in response to stimuli: - ANSWER-Contractility The ability of a muscle fiber to respond to a stimulation during an interval following contraction: - ANSWER-Refractoriness During what refractory period does the patient have a higher risk of going into a lethal rhythm? - ANSWER-Relative refractory period (cells are half empty and are able to take more electricity) Does ECG provide information on mechanical contractions- pumping action? - ANSWER-NO! ST segment depression identifies what? - ANSWER-ST ischemia ST segment elevation identifies what? - ANSWER-ST injury Which is more dangerous? depression or elevation? - ANSWER-Elevations What is the characteristics of Sinus Arrhythmia? - ANSWER-Everything is nml but the rhythm is irregular. What is treatment for Sinus arrest? - ANSWER-Discontinue digoxin Atropine is symptomatic Pacing IVCD is characterized by what? - ANSWER-A wide QRS What is it important to look at with sinus arrest? - ANSWER-The beat before and after the arrest; they should look the same What is it called when there is no p wave following a sinus arrest? - ANSWER-Junctional Rhythm What is the main difference between premature and escape beats? - ANSWER-Escape beats are protective What is a premature beat? - ANSWER-A beat that comes early shown by a shorter than normal P-P or R-R interval What is an escape beat? - ANSWER-Occurs when the nml pacer fails to fire so a lower site initiates the impulse -R-R interval is longer than nml What is the first drug of choice for atrial rhythms? - ANSWER-Calcium Channel Blockers If a patient is in A Tachy and stable, what is treatment of choice? - ANSWER-adenosine If they are unstable? - ANSWER-sedate patient and cardiovert What is treatment for Atrial Flutter? - ANSWER-Calcium Channel Blocker (diltiazem) What is the hallmark finding of A Fib? - ANSWER-Irregular rhythm