Theory ECGs TEST Corrections

The p wave represents the

• last waveform of the ECG complex

• atrial depolarization

• ventricular depolarization

• resting phase of the heart

The ECG grounding electrode is the electrode attached to the

• right arm

• left arm

• right leg

• left leg

The leads aVR, aVL, and aVF are

• standard leads

• bipolar leads

• augmented leads

• limb leads

An erroneous mark that may appear on an ECG strip is

• an artifact

• an electrolyte

• a lead

• a deflection

The precordial ECG leads are also known as

• limb leads

• chest leads

• augmented leads

• ground leads

The transmission of the electrical impulse in the heart begins in

• the AV node

• the Bundle of His

• the purkinje fibers

• the SA node

Which of the following could occur if the electrodes are too loose on the patient?

• A. wandering baseline

• B. AC interference

• C. somatic interference

• D. electrical interference

Einthoven's triangle is made of the following groups:

• the precordial leads

• leads V1, V2, and V3

• leads aVR, aVL, aVF

• leads I, II, and III

The chest lead V1 is located at the (a)   intercostal space.

Which of the following represents the time between contraction of the ventricles and recovery?

• p wave

• q wave

• S-T segment

• P-R interval