. Diseases of the heart and thoracic aorta. ases have been recorded in Englishmedical literature. ^ The contraction of the lung tends to produce a vacuum within the thorax, inconsequence of which the adjacent organs, including the heart, are of coursedisplaced (pushed rather than pulled) towards the affected side by the atmosphericpressure. When the diaphragm descends, the great vessels (and therefore the heart)are also dragged down by reason of their attachment to the pericardium. io8 Diseases of the Heart. The displacement may be either to the right or to the left,upwards or downwards, forwa
. Diseases of the heart and thoracic aorta. ases have been recorded in Englishmedical literature. ^ The contraction of the lung tends to produce a vacuum within the thorax, inconsequence of which the adjacent organs, including the heart, are of coursedisplaced (pushed rather than pulled) towards the affected side by the atmosphericpressure. When the diaphragm descends, the great vessels (and therefore the heart)are also dragged down by reason of their attachment to the pericardium. io8 Diseases of the Heart. The displacement may be either to the right or to the left,upwards or downwards, forwards or backwards. Displacement of the Heart and Apex Beat to the right maybe due to :— 1. The presence of fluid, gaseous, and solid accumulationsin the left pleural sac, or solid enlargements of the left lung. 2. Retraction of the right lung—a condition which usuallyresults from pleurisy with effusion, cirrhosis or phthisis. Pluid in the left pleural sac (see fig. 26) is by far themost common cause of displacement to the right ; and in. Fig. 26. — Displacement of the heart to the right as the result of effusion into theleft pleural cavity. (Modified from Sibson,) these cases the apex beat not unfrequently corresponds tothe right nipple. Extreme displacement to the right mayalso be due to retraction of the right lung. Sibson quotesseveral cases of this description,^ and I have seen more thanone case in which the pulsation of the heart was situated justabove the right nipple. Russell Reynolds System of Medicine, vol. iv. p. 143. Displacements of the Heart. 109 Displaceinent of the heart and apex beat to the left maybe due to: 1. Accumulation of fluid, gaseous, or solid matter in theright pleural cavity ; or solid enlargements of the right lungor right lobe of the liver. 2. Retraction of the left lung (see fig. 27).
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectheart, bookyear1884
