A Phonocardiographic Study on Cattle
I. Phonocardiogram fo Normal Cattle
1973 Volume 6 Issue 6 Pages 17-26
Details
1973 Volume 6 Issue 6 Pages 17-26
The authors tried to clarify the heart sound of calf and cattle as a basic study of the phonocardiogram (PCG) and calculate each wave of PCG. A PCG was recorded from five sites on the body surface, which were the apical site and pulmonic, aortic, mitral, and tricuspid areas, in fifteen healthy calves and five cattles.
Recording was made by a two-channel recorder at a paper speed of 50 or 100mm/sec.
A frequency filter was set at L (under 50 Hz) and M1 (50-80 Hz).
A microphone of MA-280 type (35g, 25φx 8mm), which was made by the Fukuda Electronic Co., Ltd., was used.
The PCG's records were analyzed for the following factors : pattern of PCG, duration of first (S1) and second (S2) heart sound, Q-S1 and Q-S2 interval, amplitude ratio (S2/S1), and frequency of S1 and S2.
1) All the patterns of S1 were of crescend-decrescend type and those of S2 of crescenddecrescend and decrescend types in both calves and cattle.
2) The duration of S1 was calculated to be 0.13 (0.12-0.14) sec. in the calves and 0.15 (0.14-0.17) sec. in the cattle when the L filter was used. It was 0.12 (0.11-0.13) sec. in the calves and 0.14 (0.13-0 15) sec. in the cattle when M1 filter recording was made.
3) The duration of S2 was calculated to be 0.08 (0.07-0.08) sec. in the calves and 0.08 (0.07-0.09) sec. in the cattle when the L filter was used. It was 0.07 (0.07-0.08) sec. in both calves and cattle in the M1 filter recording.
4) The Q-S1 interval was calculated to be 0.04 sec. in the calves and 0.05 sec. in the cattle in both L and M1 filter recording.
5) The Q-S2 interval was calculated to be 0.37 (0.36-0.38) sec. in the calves and 0.41 (0.40-0.44) sec. in the cattle in L filter recording, and 0.38 (0.38-0.38) sec. in the calves and 0.41 (0.40-0.41) sec. in the cattle in M1 filter recording.
6) The amplitude ratio (S2/S1) ranged from 0.6 to 1.2 in the calves and from 0.4 to 0.9 in the cattle in L filter recording, and from 0.9 to 1.5 in the calves and from 0.6 to 1.1 in the cattle in M1 filter recording.
7) The frequecy of S1 was calculated to be 40 (38-47) Hz in the calves and 40 (37-43) Hz in the cattle in L filter recording, and 53 (50-60) Hz in the calves and 51 (50-54) Hz in the cattle in M1 filter recording.
8) The frequency of S2 was calculated to be 40 (39-46) Hz in the calves and 45 (40-50) Hz in the cattle in L filter recording, and 56 (53-66) Hz in the calves and 57 (50-63) Hz in the cattle in M1 filter recording.
