. Diseases of cattle, sheep, goats and swine. Veterinary medicine. 380 PERICARDITIS. It appears to be characteristic of the presence of air in the peri- cardial cavity, and its special quality varies with the quantity accumu- lated in the pericardium. Masked by these pericardial sounds the beating of the heart seems dull, badly defined, distant and stifled. B. Jugular symptoms. The "jugular" symptoms are secondary, and result from the accumulation of liquid in the pericardial cavity. No intra-pericardial exudate can exist without exerting pressure on the heart, and as the auricles ha
. Diseases of cattle, sheep, goats and swine. Veterinary medicine. 380 PERICARDITIS. It appears to be characteristic of the presence of air in the peri- cardial cavity, and its special quality varies with the quantity accumu- lated in the pericardium. Masked by these pericardial sounds the beating of the heart seems dull, badly defined, distant and stifled. B. Jugular symptoms. The "jugular" symptoms are secondary, and result from the accumulation of liquid in the pericardial cavity. No intra-pericardial exudate can exist without exerting pressure on the heart, and as the auricles have very thin walls and are more compres- sible than the ventricles, this pressure immediately causes difficult}^ in the return circulation, whence venous stasis, varying in intensity, but clearly visible and appre- ciable on account of the distension of the jugulars. The venous stasis is general, for the pulmonary veins are as much com- pressed as the posterior and anterior venae cavse, but it is only apparent in the large superficial veins. This stasis is accompanied by venous pulse, and par- ticularly by peripheral or internal oedema, oedema of the lung, intestine, mesen- tery, etc., of the submaxil- lary space and of the dewlap and entrance to the chest, ffidema of the submaxillary space is specially charac- teristic, for it appears almost first amongst external signs. That of the dewlap follows at a later stage, and extends backwards as far as the umbilicus, rising above this point as high even as the entrance to the chest and the axillary region. C. Pulmonary symptoms. The pulmonary symptoms result from difficulty in the return circulation and from the venous stasis. They are due to passive congestion and oedema of the lung or to hydro-thorax. At rest the respiration may appear fairly regular, but at the least movement it is accelerated, and may rise to 40 or even 60 per minute. Percussion reveals lessened resonance of the parts, and in the case of hydro-thorax dulness mar
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectveterin, bookyear1920
