BPK 305 Lecture Notes - Lecture 6: Bundle Branch Block, Qt Interval, Coronary Artery Disease
29 Sep 2017
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Ecg measures movement of positive charge = propagating depolarization. Upwards deflection = depolarization moving towards the recording electrode. Downwards deflection = depolarization away from the electrode or repolarization toward the electrode. 12 lead ecg: bipolar leads, 3 bipolar limb leads, unipolar leads, 3 augmented voltage limb leads, 6 precordial or chest leads, reference electrode, 12 lead ecg 10 electrodes 4 wires. Bipolar limb leads: leads on both wrists (to represent right arm and left arm) and left ankle (to represent pubic lead) 3: standard leads, lead i: ra- -> la, lead ii: ra- -> ll, lead iii: la- -> ll, oriented in einthoven"s triangle, *remember vector math, einthoven"s law: i + iii = ii. 4: positive leads, v1 and v2 = septal (front of chest, v3 and v4 = anterior (view the anterior portion of the lv, v5 and v6 = lateral, negative, mean (i, ii, and iii) = center of heart.
