A Phonocardiographic Study on Cattle

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The authors observed phonocardiograms (PCG's) with the advance in growth of 4 calves under fattening. PCG's were recorded 8 times at intervals of 2 weeks for 98 days extending from 116 to 259 days after birth. The site of recording was the mitral valve area on the body surface. They were analyzed for the following factors: pattern of PCG, duration of the first (S1), second (S2), and foruth (S4) heart sound, Q-S1, Q-S2, and P-S4 interval, amplitude ratio (S2/S1, S4/S1), and frequency of S1, S2, and S4 heart sound. The results obtained are summarized as follows. 1. The patterns of S1 and S2 were a crescendo-decrescendo type in all the calves examined in both L and M1 filter recordings. 2. The duration of S1 and S2 in all the calves was calculated to be 0.12-0.14 and 0.06-0.07 seconds, respectively, during the observed period of fattening process in both filter recordings. 3. The Q-S1 interval in all the calves was calculated to be 0.03-0.04 seconds in both filter recordings. 4. The Q-S2 interval in all the calves was calculated to be 0.33 seconds over a period from 161 to 203 days after birth. It began to prolong, however, to 0.35 seconds at 216 days of age in both filter recordings. 5. The amplitude ratio (S2/S1) in all the calves ranged from 0.3 to 0.6 in both filter recordings. 6. In all the calves an atrial sound was frequently recorded over the period of observation. The pattern, frequency, duration, P-S4 interval, and S4/S1 ratio were the crescend-decrescend type, 20-50Hz, 0.04-0.09 seconds, 0.07-0.13 seconds, and 0.2-0.6, respectively. The PCG of calves indicated no characteristic changes with the advance in growth because of the short period of observation.
日本獣医循環器学会の論文

A Phonocardiographic Study on Cattle

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概要

日本獣医循環器学会 | 論文

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