271 Ch 4

Electrical currents flows from areas of negative charge to areas of positive charge. (76)

When current flows towards an electrode, a upward deflection is recorded; when current flows away, a downward deflection is recorded. (76)

What is the process of cells returning to resting state? Repolarization (77)

Repolarization is slower than depolarization, so its deflection is wider and has lower magnitude. (78)

The RL electrode serves what purpose? (78) Grounding

The aVR lead records the RA lead as positive and the other limb leads are the negative poles. (79)

Precordial leads are all what type? Unipolar (80)

In the QRS, if the 1st deflection is upward, what is the name of this upward wave? R wave (82)

During normal V-depolarization, why is the net charge directed leftward and posteriorly (towards the LV)? (83) due to the anatomical orientation and activation sequence of the cardiac cells.

Combining unipolar and bipolar, how many different “directions” of planer measurements can be recorded? Twelve (80)