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.
The four main causes of left axis deviation (LAD): 1  Left anterior fascicular block (LAFB): 2  Diagnostic criteria include: 3  Mean QRS axis from - 45 to - 90 (possibly. 4  A qR pattern in lead aVL, with the R-peak time, i.e., the onset of the Q wave to the peak of the R wave. 5  45 msec (slightly more than one small box wide).