Clinical electrocardiography . Fig. 93.—Notched QRS complexes in Derivation III. bundle and auricular flutter, revealed a cardiac mortality of cent. This difference in mortality is certainly definite (). Slurred QRS Complexes.—A group of electrocardiogramsof 197 patients analyzed had QRS complexes in which slurring DISORDERS OF CARDIAC CONDUCTION III or localized thickening of both limbs or of the apex changes are only slight departures from the normal: 67cases (34 per cent.) occurred in Derivation I, 36 ( per cent.)in Derivation II, and 94 ( per cent.)
Clinical electrocardiography . Fig. 93.—Notched QRS complexes in Derivation III. bundle and auricular flutter, revealed a cardiac mortality of cent. This difference in mortality is certainly definite (). Slurred QRS Complexes.—A group of electrocardiogramsof 197 patients analyzed had QRS complexes in which slurring DISORDERS OF CARDIAC CONDUCTION III or localized thickening of both limbs or of the apex changes are only slight departures from the normal: 67cases (34 per cent.) occurred in Derivation I, 36 ( per cent.)in Derivation II, and 94 ( per cent.) in Derivation III. The etiologic factors in this group were: Degenerative proc-esses 34 per cent., including hypertension with and without clin-ical nephritis per cent., exophthalmic goiter per cent.,and adenomas with hyperthyroidism per cent.; infections cent., including endocardial valvular disease per cent.,chronic myocarditis per cent., and syphilis per cent., and. Fig. 94.—Slurred Q R S complexes in Derivation I. local nutritional disturbances per cent., including arterio-sclerosis, angina pectoris, and congenital heart disease 1 per cent. The cardiac mortality in this group was 24 per cent., in con-trast to per cent, in the control group. Definite conclusions cannot be drawn with regard to notchingand slurring of the QRS complexes in isolated derivations of theelectrocardiogram. The findings are at times transient, but whenthey occur as permanent phenomena they must be treated withdue consideration (Figs. 94-96). 112 CLINICAL ELECTROCARDIOGRAPHY
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