Application of the Mechanocardiopolygram in Cattle
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概要
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A Mechanocardiogrphic polygram (MCG) was recorded from 19 normal heifers and 21 dairy cows. Carotid arterial pulse (CAP) wave pattern and left ventricular systolic time intervals (STI) were studied.<BR>1) The wave form of CAP in cattle was similar to that in human beings. All the important points (points of change in curve) were clearly demonstrated on the CAP.<BR>2) There was a significant correlation (r=0.99, n=8) in the ejection time (ET) between the pulse waves recorded from MCG and CAP.<BR>3) There was a high inverse relation between the heart rate and the electromechanical systole (QIIa) or ET which made it possible to calculate a QIIa index (QIIal) or ET index (ETI). The pre-ejection period (PEP) and the ejection index (ET/PEP) were reliable indices, because they were free from influence of the heart rate.<BR>4) Comparison was made on QII aI, ETI, PEP and ET/PEP between the normal heifers and the dairy cows. ETI was significantly longer, PEP significantly shorter, and ET/PEP significantly higher in the latter than in the former.
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