EKG Prep U
Two nursing students are reading EKG strips. One of the students asks the instructor what the P-R interval represents. The correct response should be which of the following?
"It shows the time needed for the SA node impulse to depolarize the atria and travel through the AV node." The PR interval is measured from the beginning of the P wave to the beginning of the QRS complex and represents the time needed for sinus node stimulation, atrial depolarization, and conduction through the AV node before ventricular depolarization
A patient is being examined for medical management of atrial flutter. The nurse reviews the ECG strip. He expects to see which of the following?
"Sawtooth" pattern to the waveform
The nursing instructor is discussing pacemakers with her clinical group. One of the students is caring for a client with a transvenous pacemaker. One of the students asks why this client has a transvenous pacemaker. What would be the instructor's best response?
A transvenous pacemaker is used to manage transient bradydysrhythmias like those that occur during acute MIs."
Which of the following medication classifications is more likely to be expected when the nurse is caring for a client with atrial fibrillation?
Anticoagulant
A patient with hypertension has a newly diagnosed atrial fibrillation. What medication does the nurse anticipate administering to prevent the complication of atrial thrombi?
Because atrial function may be impaired for several weeks after cardioversion, warfarin is indicated for at least 4 weeks after the procedure.
Cardioversion is used to terminate dysrhythmias. With cardioversion, the:
Cardioversion involves the delivery of a "timed" electrical current. The defibrillator is set to synchronize with the ECG and deliver the impulse during the QRS complex. The synchronization prevents the discharge from occurring during the vulnerable period of repolarization (T wave), which could result in VT or ventricular fibrillation.
Two clients in cardiac rehabilitation are discussing the differences between scheduled cardioversion and unexpected defibrillation. Which difference will the nurse confirm?
Cardioversion uses less electrical energy (50 to 100 joules) than defibrillation (200 to 360 joules).
A client has had a pacemaker inserted and is ready for discharge. The nurse is providing education about pacemaker safety. Which of the following are items that the nurse will be sure to address? Choose all that apply.
Carry a card identifying yourself as a pacemaker recipient. Avoid large magnetic fields.
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?
Clients with recurrent life-threatening tachydysrhythmias
After evaluating a client for hypertension, a physician orders atenolol (Tenormin), 50 mg P.O. daily. Which therapeutic effect should atenolol have?
Decreased cardiac output and decreased systolic and diastolic blood pressure Explanation: As a long-acting, selective beta1-adrenergic blocker, atenolol decreases cardiac output and systolic and diastolic blood pressure; however, like other beta-adrenergic blockers, it increases peripheral vascular resistance at rest and with exercise.
The nurse is analyzing the electrocardiogram (ECG) strip of a stable patient admitted to the telemetry unit. The patient's ECG strip demonstrates PR intervals that measure 0.24 seconds. Which of the following is the nurse's most appropriate action?
Document the findings and continue to monitor the patient. First-degree AV block rarely causes any hemodynamic effect; the other blocks may result in decreased heart rate, causing a decrease in perfusion to vital organs, such as the brain, heart, kidneys, lungs, and skin.
The nurse is assessing a patient with a probable diagnosis of first-degree AV block. He is aware that this dysrhythmia is evident on an ECG strip by which of the following?
First-degree AV block may occur without an underlying pathophysiology, or it can result from medications or conditions that increase parasympathetic tone. It occurs when atrial conduction is delayed through the AV node, resulting in a prolonged PR interval
A patient tells the nurse "my heart is skipping beats again; I'm having palpitations." After completing a physical assessment, the nurse concludes the patient is experiencing occasional premature atrial complexes (PACs). The nurse should instruct the patient to complete which of the following?
If PACs are infrequent, no medical interventions are necessary. Causes of PACs include caffeine, alcohol, nicotine, stretched atrial myocardium (e.g., as in hypervolemia), anxiety, hypokalemia (low potassium level), hypermetabolic states (e.g., with pregnancy), or atrial ischemia, injury, or infarction. The nurse should instruct the patient to avoid caffeinated beverages.
The nurse is caring for a client who has just been diagnosed with sinus bradycardia. The client asks the nurse to explain what sinus bradycardia is. What would be the nurse's best explanation?
In many clients a heart rate slower than 60 beats per minute is considered to slow to maintain an adequate cardiac output
Cardizem
Is a calcium channel blocker that treats atrial dysrhythmias
A nursing student is giving to a client with heart failure a medication with a positive inotropic effect on the heart. The student asks what a "positive inotropic" effect is. The correct response would be which of the following?
It increases the force of the myocardial contraction
Treatment of Ventricular Dysrhythmias
Lidocain
The nurse expects to see which of the following characteristics on an ECG strip for a patient who has third-degree AV block?
More P waves than QRS complexes
Which of the following is a potential cause of premature ventricular complexes (PVCs)?
PVCs can be caused by cardiac ischemia or infarction, increased workload on the heart (eg, exercise, fever, hypervolemia, heart failure, tachycardia), digitalis toxicity, acidosis, or electrolyte imbalances, especially hypokalemia.
Medications given prior to cardioversion to enhance the success of cardioversion and prevent relapse of the atrial fibrillation
Patients may be given amiodarone (Cordarone), flecainide (Tambocor), ibutilide (Corvert), propafenone (Rythmol), or sotalol (Betapace)
The nurse is analyzing the electrocardiogram (ECG) tracing of a client newly admitted to the cardiac step-down unit with a diagnosis of chest pain. Which of the following findings indicate the need for follow-up?
The QT interval that is 0.46 seconds long needs to be investigated. The QT interval is usually 0.32 to 0.40 seconds in duration if the heart rate is 65 to 95 bpm. If the QT interval becomes prolonged, the patient may be at risk for a lethal ventricular dysrhythmia called torsades de pointes.
The nurse is attempting to determine the ventricular rate and rhythm of a patient's telemetry strip. What should the nurse examine to determine this part of the analysis?
The RR interval is used to determine ventricular rhythm and the PP interval to determine atrial rhythm. If the intervals are the same or if the difference between the intervals is less than 0.8 seconds throughout the strip, the rhythm is called regular. If the intervals are different, the rhythm is called irregular.
The nurse is caring for clients on a telemetry unit. Which nursing consideration best represents concerns of altered rhythmic patterns of the heart?
The best representation of a nursing concern related to a cardiac arrhythmia is the inability of the heart to fill the chambers and eject blow flow efficiently. Lack of an efficient method to circulate blood and bodily fluids produces a variety of complications such as tissue ischemia, pulmonary edema, hypotension, decreased urine output, and impaired level of consciousness.
A client has a medical diagnosis of an advanced AV block and is symptomatic due to a slow heart rate. With what initial treatment(s) should the nurse be prepared to assist?
The initial treatment of choice is an IV bolus of atropine. If the client does not respond to atropine, has advanced AV block, or has had an acute MI, temporary pacing may be started. A permanent pacemaker my be necessary if the block persists.
A patient's ECG tracing reveals a ventricular rate between 250 and 400, with saw-toothed P waves. The nurse correctly identifies this dysrhythmia as which of the following?
The nurse correctly identifies the ECG tracing as atrial flutter. Atrial flutter occurs in the atrium and creates impulses at a regular atrial rate between 250 and 400 times per minute. The P waves are saw-toothed in appearance. Atrial fibrillation causes a rapid, disorganized, and uncoordinated twitching of atrial musculature. The atrial rate is 300 to 600, and the ventricular rate is usually 120 to 200 in untreated atrial fibrillation.
A positive inotropic effect will usually:
help slow respiratory rate and will increase blood flow through the kidneys, so fluid output will increase
A nurse is completing a shift assessment on a patient admitted to the telemetry unit with a diagnosis of syncope. The patient's heart rate is 55 bpm with a blood pressure of 90/66 mm Hg. The patient is also experiencing dizziness and shortness of breath. Which of the following medications will the nurse anticipate administering to the patient based on these clinical findings?
The patient is demonstrating signs and symptoms of symptomatic sinus bradycardia. Atropine is the medication of choice in treating symptomatic sinus bradycardia
The licensed practical nurse is co-assigned with a registered nurse in the care of a client admitted to the cardiac unit with chest pain. The licensed practical nurse is assessing the accuracy of the cardiac monitor, which notes a heart rate of 34 beats/minute. The client appears anxious and states not feeling well. The licensed practical nurse confirms the monitor reading. When consulting with the registered nurse, which of the following is anticipated?
The registered nurse administering atropine sulfate intravenously Explanation: The licensed practical nurse and registered nurse both identify that client's bradycardia. Atropine sulfate, a cholinergic blocking agent, is given intravenously (IV) to increase a dangerously slow heart rate.
Your client has just been diagnosed with a dysrhythmia. The client asks you to explain normal sinus rhythm. What would you explain is the characteristic of normal sinus rhythm?
The sinoatrial (SA) node initiates the impulse the SA node initiates the impulse, the impulse travels to the AV node in 0.12 to 0.2 second
Pronestyl
Treats and Prevents Atrial and Ventrical Dysrhythmias
a rapid, disorganized ventricular rhythm that causes ineffective quivering of the ventricles. The ventricular rate is greater than 300 per minute and extremely irregular, without a specific pattern. The QRS shape and duration is irregular, undulating waves without recognizable QRS complexes
Ventricular Fibrillation
The nurse is working on a monitored unit assessing the cardiac monitor rhythms. Which waveform pattern needs attention first?
Ventricular fibrillation is called the rhythm of a dying heart. It is the rhythm that needs attention first because there is no cardiac output, and it is an indication for CPR and immediate defibrillation.
the ventricles depolarize inthe ventricles depolarize in __________________, and each impulse occurs regularly
in 0.12 seconds or less,
Premature ventricular contractions (PVCs) are considered precursors of ventricular tachycardia (VT) when they
occur at a rate of more than six per minute PVCs are dangerous when they occur on the T wave. PVCs are dangerous when they are multifocal (have different shapes). A PVC that is paired with a normal beat is termed bigeminy.
When the nurse observes that the patient's heart rate increases during inspiration and decreases during expiration, the nurse reports that the patient is demonstrating
sinus dysrhythmia.
