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The ability of cardiac cells to initiate an impulse spontaneously and continuously...
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Automaticity
The ability of cardiac cells to be electrically stimulated...
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Excitability
The ability of cardiac cells to transmit an impulse along a membrane in an orderly manner...
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Conductivity
The ability of cardiac cells to respond mechanically to an impulse...
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Contractility
The vagus nerve is stimulated by the PNS. What happens to heart conduction?
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The SA node decreases the number of times it fires, ultimately decreasing muscle contraction and heart rate
A cardiac cell has a high concentration of ______ and a low concentration of ________, completely opposite of the environment maintained outside of the cell.
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High Potassium, low sodium
Rapid movement of sodium out of the cardiac cell is referred to as polarization or repolarization?
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Repolarization
Rapid movement of sodium into the cardiac cell is referred to as polarization or repolarization?
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Polarization
ECG leads I, II, III, aVr, aVl, and aVf record electrical forces in the ________ field.
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Frontal
ECG leads V1-V6 measure electrical activity in the horizontal fields. These are called the ________ leads.
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Precordial
What are the three most common leads used for ECG monitoring?
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II, V1 and MCL1
The most accurate way to calculate a patient's heart rate using an ECG is to... The most common method used to get the heart rate is to...
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-count the number of QRS intervals in one minute -count the number of R-R intervals in 6 seconds and multiply it by 10
How is a patient's skin prepared prior to the administration of leads for an ECG?
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excessive chest hair is clipped, dry gauzed is lightly rubbed over the skin until it is pink. If the skin is oily, alcohol is used first. If the patient is sweaty, benzoin is applied
___________ is the observation of a patient's heart rate and rhythm to rapidly diagnose dysrhythmias, ischemia or infarction.
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Telemetry monitoring
What does the P wave on an ECG represent?
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Depolarization of the atria
What does the PR interval represent?
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The amount of time it took for the electrical impulse to travel through the atria, to the AV node, through the bundle of His and the Purkinje fibers
What does the QRS complex represent on an ECG?
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Ventricular contraction
What does the QRS interval on an ECG indicate?
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The amount of time it took the ventricles to depolarize
What does the ST segment on an ECG represent?
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The amount of time it took for the ventricles to undergo depolarization and repolarization
Which part of the assessment of the cardiac rhythm on an ECG is usually flat, or isoelectric?
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The ST segment
What does the T wave represent?
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Repolarization of the ventricles
What does the QT interval represent?
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The amount of time it took for the ventricles to depolarize and repolarize
___________ refers to the ability of specialized cells in the atria, SA node, AV node, bundle of His and Purkinje fibers to discharge spontaneously.
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Automaticity
What is the normal firing rate of the SA node?
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60-100 times per minute
How frequently can the AV node fire if needed?
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40-60 times per minute
How frequently can the His-Purkinje system fire if needed?
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20-40 times a minute
A rate of less than 60 BPM that is regular and rhythmic is called...
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Sinus Bradycardia
A rate of more than 100 BPM that is regular and rhythmic is called...
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Sinus tachycardia
This heart pattern is characterized by a heart rate that is between 60-100 BPM and irregular. ECG monitoring will reveal an abnormally shaped P wave.
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PAC
This dysrhythmia is characterized by 100-300 regular beats per minute and an abnormally shaped P wave with a normal or shortened PR interval and normal QRS complex.
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PSVT


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