ECG ECG in Clinical Practice 5

Question 1

A chaotic, disorganized waveform with no identifiable QRS complexes in a pulseless patient indicates what?

Accepted Answer

Ventricular fibrillation

Answer

Ventricular fibrillation appears as a chaotic waveform with no organized QRS and requires immediate defibrillation.

Question 2

For an accurate ECG on a female patient, where are the chest electrodes placed relative to breast tissue?

Accepted Answer

Under the breast on the chest wall

Answer

Chest leads should be placed under the breast on the chest wall for accurate signal capture.

Question 3

What does a prolonged QT interval increase the risk of?

Accepted Answer

Torsades de pointes

Answer

A prolonged QT interval predisposes patients to torsades de pointes, a polymorphic ventricular tachycardia.

Question 4

Which leads are considered the lateral leads on a 12-lead ECG?

Accepted Answer

I, aVL, V5, and V6

Answer

Leads I, aVL, V5, and V6 view the lateral wall of the left ventricle.

Question 5

A technician records an ECG and finds the calibration signal is only 5 mm tall instead of 10 mm. What does this indicate?

Accepted Answer

The gain is set to half standard

Answer

A 5 mm calibration box means the gain is set at half standard (0.5 mV per cm).

ECG (Electrocardiogram) Practice Test