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Electrocardiogram
Question | Answer |
---|---|
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. |