Clinical electrocardiography . myocardial changes, it is obvious that pericarditis,aneurysm, and innumerable other diseases do not result in char-acteristic electrocardiograms. Certain conditions, however, re-veal tracings with certain uniformities. Some of these will bepresented here. CHRONIC ENDOCARDIAL VALVULAR DISEASES Mitral Regurgitation.—In mitral regurgitation the ultimatebrunt of the deformity falls to the right ventricle, which hyper-trophies. Electrocardiograms are very apt to show preponderanceof the right ventricle (Fig. 126). Mitral Stenosis.—Electrocardiograms of patients with m
Clinical electrocardiography . myocardial changes, it is obvious that pericarditis,aneurysm, and innumerable other diseases do not result in char-acteristic electrocardiograms. Certain conditions, however, re-veal tracings with certain uniformities. Some of these will bepresented here. CHRONIC ENDOCARDIAL VALVULAR DISEASES Mitral Regurgitation.—In mitral regurgitation the ultimatebrunt of the deformity falls to the right ventricle, which hyper-trophies. Electrocardiograms are very apt to show preponderanceof the right ventricle (Fig. 126). Mitral Stenosis.—Electrocardiograms of patients with mitralstenosis are fairly uniform. In this lesion the left auricle and thenthe right ventricle bear the brunt of the burden, and, therefore,hypertrophy of these chambers occurs quite constantly. Owingto hypertrophy of the left auricle, the P wave is often increasedin amplitude and frequently notched because of slight auricular asynchronism. These changes are usually noted in Derivations 149 IS© CLINICAL ELECTROCARDIOGRAPHY. Fig. 126.—Electrocardiogram of patient with mitral regurgitation. Notched Pwave in Derivation II. Right ventricular preponderance.
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