The Demarc Pre-Wire is not interfaced into the local access providers's side of the Demarcation Point and thus is not a demarc extension. Patch Cord Testing. A demarc extension by definition is a complete channel, which can include patch cords or cross connects.
Answer: Left Axis Deviation (LAD) refers to the pattern of electrical activation that occurs in the heart. LAD is an EKG-specific finding and not necessarily indicative of any specific cardiovascular condition. was recently found to have Left Axis Deviation (LAD) on my EKG. General responses to selected questions from Joel Braunstein, MD, of Johns Hopkins University and Joseph Toscano, MD.
Usually, these two leads are enough to diagnose a normal heart axis! A normal heart axis is between -30 and +90 degrees. 1  A left heart axis is present when the QRS in lead I is positive and negative in II and AVF. (between -30 and -90 degrees). 2  A right heart axis is present when lead I is negative and AVF positive. 3  An extreme heart axis is present when both I and AVF are negative.