The posterior lead that goes just to the left of the spine in the 5th intercostal space is:

When a patient has ____, the patient experiences severe pain whenever the humerus is internally rotated or elevated because the motion compresses the acromion against the tendons and bursa.

A. medial collateral impingement syndrome B. shoulder impingement syndrome C. anterior cruciate herniation D. sternoclavicular dislocation

On an ECG tracing, what is an isoelectric line called?

a. interval c. waveform b. segment d. complex