When the horizontal diameter of the lower cardiac silhouette well exceeds one half of the internal diameter of the thorax, cardiomegaly is diagnosed. It is wise to assess the depth of the inspiration by noting whether the diaphragm lies lower than the ninth or tenth rib posteriorly as it should if there is an adequate inspiratory effort. Cardiomegaly may result from enlargement of the cardiac ...

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Enlarged heart Enlargement of the heart is a sign of serious disease of the muscle of the heart. When disease attacks the muscles of the heart, the ability of the heart to function properly as a pump is reduced. This causes the blood flow to slow and the heart to enlarge. The heart is one of nature's most efficient and durable pumps. Throughout life, it beats an average of sixty to eighty times ...