ECG ECG Lead Placement and Equipment 2

Question 1

What does the standard calibration signal on ECG paper look like?

Accepted Answer

1 mV = 10 mm tall square wave

Answer

Standard ECG calibration is 1 mV = 10 mm (two large boxes) in amplitude.

Question 2

Which leads are referred to as the augmented limb leads?

Accepted Answer

aVR, aVL, aVF

Answer

aVR, aVL, and aVF are the three augmented unipolar limb leads.

Question 3

What is the recommended minimum number of leads monitored continuously in a telemetry unit?

Accepted Answer

2

Answer

Continuous telemetry monitoring typically requires at least 2 leads to improve arrhythmia detection.

Question 4

When a patient has a limb amputation preventing standard lead placement, where can the arm lead be repositioned?

Accepted Answer

On the shoulder or upper torso near the limb stump

Answer

When a limb is absent, the electrode is placed as close to the original site as possible, such as on the shoulder stump.

Question 5

What is the voltage gain setting used in half-standardization on an ECG?

Accepted Answer

5 mm/mV

Answer

Half-standardization sets gain to 5 mm/mV, used when waveforms are too tall at normal gain.

ECG Certification Practice Test