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Loraine Balingit, 125933 (Logout) – Dubai Hospital
12-lead electrocardiogram (ECG)
Score: 100% (12 of 12)
(Correct answers are in bold.)
What does the QRS complex represent on an electrocardiogram waveform?
Ventricular repolarization
Ventricular depolarization
Atrial repolarization
Atrial depolarization
Rationale: The QRS complex represents ventricular depolarization.
How is a standard electrocardiogram (ECG) complex labeled?
P-QRS-T
P-QRJ-T
P-RST-U
L-MNO-Q
Rationale: The ECG device measures and averages the difference in electrical
potential of the electrode sites for each lead and graphs them over time. This creates
the standard ECG complex, which is made up of P-QRS-T.
When preparing to obtain an electrocardiogram, how should you position the patient?
Side-lying
Sims
Supine
Prone
Rationale: Have the patient lie supine in the center of the bed with his arms at his
sides. Raise the head of the bed, if the patient desires, to promote comfort.
On what limb areas should you place the electrodes to provide the best
electrocardiogram tracing?
Bony areas
Hairy areas
Flat, fleshy areas
Muscular areas
Rationale: Select flat, fleshy areas to place the limb lead electrodes to provide the
best tracing.
A standard electrocardiogram (ECG) produces how many views of electrical activity?
12
8
6
10
Rationale: The standard 12-lead ECG uses a series of electrodes placed on the
extremities and the chest wall to assess the heart from 12 different views (leads).
What's the correct placement of the V4 electrode?
Fifth intercostal space at the midaxillary line
Fourth intercostal space at the right border of the sternum
Fifth intercostal space at the midclavicular line
Halfway between V2 and V5
Rationale: The V4 electrode should be placed over the fifth intercostal space at the
midclavicular line.
What does electrocardiography measure?
Heart's electrical activity
Right atrial function
Left ventricular activity
Cardiac output
Rationale: Electrocardiography measures the heart's electrical activity as waveforms.
What should you keep in mind if the patient has a permanent pacemaker?
You should avoid placing the electrodes over the pacemaker.
You should avoid performing an electrocardiogram.
You may perform the electrocardiogram with or without a magnet.
You must place the leads on the opposite side of the chest.
Rationale: If the patient has a pacemaker, you may perform the electrocardiogram
(ECG) with or without a magnet, according to the practitioner's orders. Note the
presence of the pacemaker and the use of the magnet on the ECG strip.
What does the T wave represent on an electrocardiogram waveform?
Ventricular depolarization
Ventricular repolarization
Atrial repolarization
Atrial depolarization
Rationale: The T wave represents ventricular repolarization.
What does the P wave represent on an electrocardiogram waveform?
Ventricular repolarization
Atrial depolarization
Atrial repolarization
Ventricular depolarization
Rationale: The P wave represents atrial depolarization.
Ventricular depolarization and repolarization are represented by what electrocardiogram
measure?
QT interval
QRS complex
T wave
PR interval
Rationale: The QT interval represents the time of ventricular depolarization and
repolarization.
What is the correct placement of the V6 electrode?
Fourth intercostal space at the right sternal border
Fifth intercostal space at the midaxillary line, level with V4
Fifth intercostal space at the right sternal border
Fifth intercostal space at the anterior axillary line
Rationale: The V6 electrode should be placed at the fifth intercostal space at the
midaxillary line, level with V4.
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