Clinical electrocardiography . ation III,left arm —, left leg + (Fig. 101). This arrangement impliespositive or upright deflections in all derivations of the electro-cardiogram. If it is assumed that the conduction-contractiontheory is correct the T wave is the expression of preponderanceof contraction on one side of the line of equipotential. T wavenegativity (inversion), therefore, results from changes in contrac-tion preponderance. The negativity of this wave in certain isolatedor combined derivations of the electrocardiogram is indicativeof definite potential changes affecting contraction
Clinical electrocardiography . ation III,left arm —, left leg + (Fig. 101). This arrangement impliespositive or upright deflections in all derivations of the electro-cardiogram. If it is assumed that the conduction-contractiontheory is correct the T wave is the expression of preponderanceof contraction on one side of the line of equipotential. T wavenegativity (inversion), therefore, results from changes in contrac-tion preponderance. The negativity of this wave in certain isolatedor combined derivations of the electrocardiogram is indicativeof definite potential changes affecting contraction preponderancein various regions of the cardiac musculature. In the normal heart, therefore, according to standard deriva-tions the T wave in all derivations is positive (upright), the upperright zone of potential is strongly electronegative to the apicalzone, while the left upper zone is iso-electric. This potential Positive T wave in all Derivations (.normal)TLti. arm. Fig. 101 ALt le6+ + £ Negative ^n Derivation Rt. arm
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Keywords: ., bookcentury1900, bookdecade1920, bookidclinicalelec, bookyear1922
