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Electrocardiogram

QuestionAnswer
What is an electrocardiogram? The graphic record of the electrical current as it progresses through the heart.
What is a MA's responsibility during an EKG? Explaining the procedure to the patient and placing the leads on the patient.
What are leads? A combination of electrodes. They can record the electrical impulse from the heart in different angles.
What can EKGs diagnose? Ischemia, delays in impulse conduction, hypertrophy of the cardiac chambers, and arrhythmias.
What are EKGs not used for? Anatomic (structural) disorders, such as heart murmurs.
What does 1 small, horizontal block on an EKG graph represent? 0.04 seconds.
What does 1 small, vertical block on an EKG graph represent? Voltage (0.1 millivolts).
How many leads does a standard EKG have? 12.
Why do multiple leads help? It produces a 3-dimensional record of the impulse wave.
What does the RL lead do? As the grounding lead, it helps reduce alternating current (AC) interference and keeps the average voltage of the patient the same as that of the recording instrument.
What do leads I, II, and III do? Attached to electrodes on the patients left leg and arms, they make up the combinations necessary for the first 6 views of the heart.
What do leads aVR, aVL, and aVF (augmented unipolar limb leads) do? The electrode measurements in leads I, II, and III that provide a signal between the average of the remaining two electrodes that aren't it's own.
Where are leads V1-V6 placed? On the anterior chest.
What is an artifact? An abnormal signal that doesn't reflect electrical activity of the heart during the cardiac cycle.
What should the paper speed on the EKG machine be set to? 25 mm per second.
Created by: deleted user
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