RMA EKG and Electrocardiography 3

Question 1

What does the QRS complex represent on an EKG tracing?

Accepted Answer

Ventricular depolarization

Answer

The QRS complex reflects rapid depolarization of the ventricles.

Question 2

The standard paper speed for a routine 12-lead EKG is:

Accepted Answer

25 mm/second

Answer

Routine EKGs run at 25 mm/second, the basis for standard time measurements.

Question 3

Where should the left leg (LL) limb electrode be placed?

Accepted Answer

Lower left leg or ankle

Answer

The LL electrode is placed on the lower left leg, typically at the ankle.

Question 4

A standardization mark on an EKG that is 10 mm tall confirms what?

Accepted Answer

Proper voltage calibration (1 mV = 10 mm)

Answer

A 10 mm standardization mark verifies that 1 millivolt produces a 10 mm deflection.

Question 5

The brief flat segment between atrial and ventricular depolarization that allows ventricular filling is the:

Accepted Answer

PR segment

Answer

The PR segment reflects the delay at the AV node before ventricular activation.

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