ECG Basics Questions And Answers With Complete Solutions

Ventricular fibrillation is generally present with cardiac arrest and is most often brought on by myocardial ischemia. - T o F correct answer: False Which is the correct intervention sequence for asystole? correct answer: Assess the patient; confirm rhythm in another lead; initiate CPR Which heart block is considered normal in some individuals? correct answer: Normal sinus rhythm (NSR) with 1st degree block What does the information found in the last 0.04 seconds from the J point back into the QRS complex differentiate? correct answer: Right bundle branch block from left bundle branch block Which is a key to differentiating 2nd degree block type I from type II? correct answer: PR intervals In 3rd degree heart block the QRS is always 0.12 or greater. - t o f correct answer: False 7. The P wave is never hidden in which one of the following rhythms? correct answer: 2nd degree heart block type II A patient with 3 or more consecutive ventricular escape beats at a rate of 40-100 beats per minute has which of the following rhythms? correct answer: Accelerated idoventricular rhythm (IVR) What are premature ventricular complexes (PVCs) that arise from several irritable sites called? correct answer: . Multifocal premature ventricular complexes Ventricular tachycardia is a potentially life-threatening rhythm. t o f correct answer: True 12. After reperfusion therapy it is not unusual to see which rhythm? correct answer: A. Accelerated idioventricular rhythm (IVR) Which medication is first-line to treat asymptomatic supraventricular tachycardia (SVT)? correct answer: Adenosine What rhythm is characterized by a conduction block between the atria and ventricles resulting in some nonconducted P waves (QRS complex drops) but fixed PR intervals when the P wave and QRS complex appear together? correct answer: 2nd degree heart block type II When atropine is ineffective for symptomatic sinus bradycardia your next intervention would be what? correct answer: Transcutaneous pacing Premature ventricular complexes that occur 2 in a row are referred to as bigeminal. - t o f correct answer: False . A sustained ventricular tachycardia lasts longer than 30 seconds. - t o f correct answer: True When a patient experiences three or more consecutive ventricular escape beats at 20 to 40 beats per minute, the patient is experiencing which of the following rhythms? correct answer: Idioventricular rhythm Which rhythm is demonstrated if the heart has lost all electrical activity? correct answer: Asystole Why is the R-on-T premature ventricular complex (PVC) of major concern? correct answer: The ventricles are being stimulated during the relative refractory period . An ECG strip that showed a regular rhythm, an atrial rate greater than the ventricular rate, a constant PRI and two P waves for each QRS complex, and the a QRS is 0.04-0.10 seconds; what rhythm would be identified? correct answer: 2nd degree block type II An ECG strip that showed a regular atrial and ventricular rate, normal QRS and normal P waves with a PR interval greater than 0.20 seconds would be identified as a _________. correct answer: Sinus rhythm with 1st degree block Which is the appropriate sequence when initiating CPR? correct answer: Assess the patient; do 2 minutes of CPR; activate EMS Three or more consecutive premature ventricular complexes (PVC) at a rate greater than 100 is called: correct answer: Ventricular tachycardia (VT) Which of the following statements is inaccurate about idioventricular rhythms? correct answer: . The PR interval in this rhythm is within normal range What is the first-line antiarrythmic for ventricular tachycardia with a pulse? correct answer: Amiodarone If the patient with supraventricular tachycardia is stable, vagal maneuvers may be used to stimulate the vagus nerve which releases _____. correct answer: Acetylcholine Which three (3) are examples of supraventricular tachycardia (SVT)? correct answer: B. Atrial fibrillation C. Atrial flutter D. Junctional tachycardia Correct What is the initial treatment for 3rd degree heart block? correct answer: Transcutaneous pacer Which antiarrythmic is given for pulseless ventricular tachycardia (VT) and ventricular fibrillation (Vfib) that is unresponsive to CPR, defibrillation, and a vasopressor? correct answer: Amiodarone Which of the following ECG strip descriptions would indicate the most significant blockage? correct answer: No PRI; more Ps than QRSs; ventricular rate of 20-40 bpm; QRS 0.10 seconds All junctional rhythms originate from which pacemaker site? correct answer: . AV junction Which is the correct intervention sequence for ventricular fibrillation? correct answer: . Access the patient; initiate CPR; defibrillate ASAP What period of time defines a sustained ventricular tachycardia? correct answer: 30 seconds What is the initial treatment response for a patient in either pulseless ventricular tachycardia or ventricular fibrillation? correct answer: Provide quality CPR and defibrillate Heart blocks occur when there is a partial or complete interruption in the cardiac conduction system. - t o f correct answer: True The ECG monitor displays a normal-appearing rhythm but when you assess the patient they are unresponsive and pulseless. What rhythm would this be? correct answer: pulseless electrical activity (PEA) What is the initial step in treating stable sinus tachycardia? correct answer: Treat the underlying cause What rhythm is delayed in the AV node causing a prolonged PR interval? correct answer: 1st degree heart block A patient whose ECG shows a rapid, chaotic rhythm and no discernible P waves or QRS complexes is probably in what dysrhythmia? correct answer: Ventricular fibrillation Which of the following is a possible cause for ventricular fibrillation (V-fib)? correct answer: . Myocardial ischemia