232

HEART DISEASES

[VOL. vi

Clinical
picture

X-rays

Electro-
cardiogram

Diagnosis
Prognosis

right ventricle is extremely small and aplastic, and there may be pulmo-
nary atresia. The ductus arteriosus remains patent. This group of
abnormalities constitutes a functional cor biatriatum triloculare.

Cyanosis is present from birth and gradually deepens in intensity.
Murmurs are usually absent, unless there is an associated interventricular
septal defect.

Radiography shows a large left ventricle, a dilated right auricle, and
a small vascular pedicle.

Left axis deviation is present.

The combination of cyanosis with left axis deviation in the electro-
cardiogram is sufficiently characteristic of this defect to enable a correct
diagnosis to be made.

Life is usually not protracted, the average age at death being 5 years.
Life may be more prolonged in those cases in which there is trans-
position of the vessels.

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