Clinical electrocardiography . Fig. 121.—Electrocardiogram of patient with congenital aortic stenosis. NegativeT wave in Derivations I, II, and III. Left ventricular preponderance. PATENT FORAMEN OVALE Patency of the foramen ovale is often not attended by signsand symptoms; its presence is determined by the size of the open-. Fig. 122.—Electrocardiogram of patient with patent foramen ovale. Markedpreponderance of the right ventricle. Respiratory variation of amplitude of Rwaves especially noticeable in Derivation I. CONGENITAL HEART DISEASE 145 ing and association with other congenital cardiac
Clinical electrocardiography . Fig. 121.—Electrocardiogram of patient with congenital aortic stenosis. NegativeT wave in Derivations I, II, and III. Left ventricular preponderance. PATENT FORAMEN OVALE Patency of the foramen ovale is often not attended by signsand symptoms; its presence is determined by the size of the open-. Fig. 122.—Electrocardiogram of patient with patent foramen ovale. Markedpreponderance of the right ventricle. Respiratory variation of amplitude of Rwaves especially noticeable in Derivation I. CONGENITAL HEART DISEASE 145 ing and association with other congenital cardiac defects. Whenthe opening in the interauricular septum is small, little or no effecton the circulation is exerted. When the opening is large, andespecially when the left ventricle fails or the pressure in the leftauricle rises, as in mitral stenosis, the blood-current regurgitatesinto the right auricle. This obviously increases the work of theright heart, and frequently the electrocardiograms of these patientsreveal preponderance of the right ventricle (Fig. 122). INTERVENTRICULAR SEPTUM DEFECTDefects of the interventricular septum uncomplicated by othercongenital anomalies are rare. Pulmonic stenosis is the usual
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