Question

What accurately describes ECG monitoring?

a. Depolarization of the cells in the ventricles produces the T wave on the ECG.
b. An abnormal cardiac impulse that arises in the atria, ventricles, or AV junction can create a premature beat is known as an artifact.
c. Lead placement for V1 includes one lead each for right arm, right leg, and left leg with the fifth lead on the fourth intercostal space to the right of the sternal boarder.
d. If the SA node fails to discharge an impulse or discharges very slowly, a secondary pacemaker in the AV node is able to discharge at a rate of 30 to 40 times per minute.

Answer 1

An ECG accurately monitors the heart's electrical activity, including waves of depolarization and repolarization. The T wave reflects ventricular repolarization, and the P wave and QRS complex represent atrial depolarization and ventricular depolarization, respectively.

Step-by-step explanation:

What accurately describes ECG monitoring? The correct description is that depolarization of the cells in the ventricles produces the T wave on the ECG. An abnormal cardiac impulse that arises in the atria, ventricles, or AV junction can create a premature beat, but this is usually referred to as an ectopic beat, not an artifact. Lead placement for V1 should indeed include the fifth lead on the fourth intercostal space to the right of the sternal border, but not each for the right arm, right leg, and left leg; these are used for limb leads. If the SA node fails, a secondary pacemaker in the AV node can discharge at a rate of 40 to 60 times per minute, rather than 30 to 40.

An electrocardiogram records the wave of depolarization and subsequent repolarization in the heart. For example, the P wave is generated by the depolarization of the atria, and the ventricles depolarize to create the QRS complex. The repolarization phase of the ventricles, which readies them for the next beat, manifests as the T wave on the ECG.