prepu – Flashcards
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Which of the following ECG waveforms characterizes conduction of an electrical impulse through the left ventricle?
answer
QRS complex.
The QRS complex represents ventricular depolarization. The P wave is an ECG characteristic reflecting conduction of an electrical impulse through the atria. The PR interval is a component of an ECG tracing reflecting conduction of an electrical impulse through the AV node. The QT interval is an ECG characteristic reflecting the time from ventricular depolarization to repolarization
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The nurse expects to see which of the following characteristics on an ECG strip for a patient who has third-degree AV block?
answer
More P waves than QRS complexes
There is no PR interval because there isn't any relationship between the P and R wave. No atrial impulse is conducted through the AV node; atrial and ventricular contractions are independent. With third-degree AV block, two separate impulses stimulate the heart; there is no synchrony or relationship
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A nurse is caring for a client who's experiencing sinus bradycardia with a pulse rate of 40 beats/minute. His blood pressure is 80/50 mm Hg and he complains of dizziness. Which medication does the nurse anticpate administering to treat his bradycardia?
answer
Atropine
I.V. push atropine is used to treat symptomatic bradycardia. Dobutamine is used to treat heart failure and low cardiac output. Amiodarone is used to treat ventricular fibrillation and unstable ventricular tachycardia. Lidocaine is used to treat ventricular ectopy, ventricular tachycardia, and ventricular fibrillation.
question
A client receives a pacemaker to treat a recurring arrhythmia. When monitoring the cardiac rhythm strip, the nurse observes extra pacemaker spikes that don't precede a beat. Which condition should the nurse suspect?
answer
Failure to capture
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The nurse is observing the monitor of a patient with a first-degree atrioventricular (AV) block. What is the nurse aware characterizes this block?
answer
Delayed conduction, producing a prolonged PR interval
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A patient with mitral valve stenosis and coronary artery disease (CAD) is in the telemetry unit with pneumonia. The nurse assesses a 6-second rhythm strip and determines that the ventricular rhythm is highly irregular at 88, with no discernible P waves. What does the nurse determine this rhythm to be?
answer
Atrial flutter
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A pacemaker is the treatment of choice for what cardiac dysrhythmia?
answer
complete heart block
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The nurse is teaching a beginning EKG class to staff nurses. As the nurse begins to discuss the the parts of the EKG complex, one of the students asks what the normal order of conduction through the heart is. The correct response would be which of the following?
answer
Sinoatrial (SA) node, atrioventricular (AV) node, bundle of His, right and left bundle branches, and the Purkinje fibers
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Electrocardiogram (ECG) characteristics of atrial fibrillation include which of the following?
answer
Atrial rate of 300 to 400
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You are caring for a client who has been admitted to have a cardioverter defibrillator implanted. You would know that implanted cardioverter defibrillators are used in what clients?
answer
Clients with recurrent life-threatening tachydysrhythmias
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Which of the following nursing interventions must a nurse perform when administering prescribed vasopressors to a patient with a cardiac dysrhythmia?
answer
Monitor vital signs and cardiac rhythm
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Which of the following tends to be prolonged on the electrocardiogram (ECG) during a first-degree atrioventricular (AV) block?
answer
PR interval
