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Nursing Practice (NSG321 ) Dysrhythmia Quiz

John Marsh
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Quiz cardiac #2 – Lecture notes 2

Grand Canyon University

Nursing Practice (NSG321 )

Lewis: Medical-Surgical Nursing, 9
Chapter 36
Nursing Management: Dysrhythmias
The ability to recognize normal and abnormal cardiac rhythms, called dysrhythmias, is an essential nursing skill.
Four properties of cardiac cells (automaticity, excitability, conductivity, and contractility) enable the conduction system to start an electrical impulse,
send it through the cardiac tissue, and stimulate the myocardial tissue to contract.
The autonomic nervous system plays an important role in the rate of impulse formation, the speed of conduction, and the strength of cardiac
Electrocardiogram Monitoring
The electrocardiogram (ECG)-g is a graphic tracing of the electrical impulses produced in the heart.
ECG waveforms are produced by the movement of charged ions across the semipermeable membranes of myocardial cells.
There are 12 recording leads in the standard ECG. Changes in a 12-lead ECG may occur with ischemia, infarction, electrolyte imbalance, conduction
disturbances, dysrhythmias, or drug toxicity.
Continuous ECG monitoring is done using one or more leads and based on the patient’s clinical status.
Telemetry monitoring involves the observation of a patient’s heart rate (HR) and rhythm to help rapidly diagnose dysrhythmias, ischemia, or
Normal sinus rhythm- starts in the sinoatrial (SA) node and follows the normal conduction.conduction pattern of the cardiac cycle.
The P wave- represents the depolarization of the atria. (passage of an electrical impulse through the atria), causing atrial contraction.
The PR interval- represents the time period for the impulse to spread through the atria, atrioventricular (AV) node, bundle of His, and Purkinje fibers.
The QRS complex represents- depolarization of the ventricles (ventricular contraction).
The QRS interval- represents the time it takes for depolarization.
The ST segment- represents the time between ventricular depolarization and & repolarization. This segment should be flat or isoelectric and represents the
absence of any electrical activity between these two events.
The T wave represents repolarization of the ventricles.
The QT interval- represents the total time for depolarization and& repolarization of the ventricles.
Dysrhythmias result from disorders of impulse formation, conduction of impulses, or both.
Evaluation of Dysrhythmias
Dysrhythmias result from various abnormalities and disease states, and the cause of a dysrhythmia influences the treatment.
Noninvasive diagnostic tests used to evaluate DX for cardiac dysrhythmias- and the effectiveness of antidysrhythmia drug therapy include Holter
monitoring, event monitoring (or loop recorder), exercise treadmill testing, and signal-averaged ECG.
An electrophysiologic study (EPS)- identifies different mechanisms ofcause of tachydysrhythmias, heart blocks, bradydysrhythmias, and causes of syncope..




Nursing Practice (NSG321 ) Dysrhythmia Quiz

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