A Phonocardiographic Study on Cattle
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概要
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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.<BR>Recording was made by a two-channel recorder at a paper speed of 50 or 100mm/sec.<BR>A frequency filter was set at L (under 50 Hz) and M<SUB>1</SUB> (50-80 Hz).<BR>A microphone of MA-280 type (35g, 25φx 8mm), which was made by the Fukuda Electronic Co., Ltd., was used.<BR>The PCG's records were analyzed for the following factors : pattern of PCG, duration of first (S<SUB>1</SUB>) and second (S<SUB>2</SUB>) heart sound, Q-S<SUB>1</SUB> and Q-S<SUB>2</SUB> interval, amplitude ratio (S<SUB>2</SUB>/S<SUB>1</SUB>), and frequency of S<SUB>1</SUB> and S<SUB>2</SUB>.<BR>1) All the patterns of S<SUB>1</SUB> were of crescend-decrescend type and those of S<SUB>2</SUB> of crescenddecrescend and decrescend types in both calves and cattle.<BR>2) The duration of S<SUB>1</SUB> 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 M<SUB>1</SUB> filter recording was made.<BR>3) The duration of S<SUB>2</SUB> 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 M<SUB>1</SUB> filter recording.<BR>4) The Q-S<SUB>1</SUB> interval was calculated to be 0.04 sec. in the calves and 0.05 sec. in the cattle in both L and M<SUB>1</SUB> filter recording.<BR>5) The Q-S<SUB>2</SUB> 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 M<SUB>1</SUB> filter recording.<BR>6) The amplitude ratio (S<SUB>2</SUB>/S<SUB>1</SUB>) 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 M<SUB>1</SUB> filter recording.<BR>7) The frequecy of S<SUB>1</SUB> 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 M<SUB>1</SUB> filter recording.<BR>8) The frequency of S<SUB>2</SUB> 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 M<SUB>1</SUB> filter recording.
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