THE NATURE OF LEADS I AND III OF THE ELECTROCARDIOGRAM

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Abstract
When the anterior surfaces of both right and left ventricles (dog) are cooled, a prolonged, inverted T1 is produced, while T3 is prolonged and upright. QRS1 is increased and QRS3 diminished. Cooling the posterior surfaces of both ventricles produces a prolonged upright T1 and a prolonged inverted T3. QRS1 is diminished and QRS3 augmented. Heating the anterior surfaces produces an upright T1 of normal duration and an inverted T3. QRS1 is diminished and QRS3 augmented. Warming the posterior surfaces produces an inverted T1 and an upright T3. QRS1 is increased and QRS3 diminished. These findings support the view that lead I records the summation of the anterior levocardiogram and the posterior dextrocardiogram, while lead III records the summation of the anterior dextrocardiogram and the posterior levocardiogram.

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