FETAL ELECTROCARDIOGRAM IN DAIRY CATTLE : III VARIATIONS IN FETAL QRS PATTERN
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概要
- 論文の詳細を見る
The authors intended to make more detailed analysis of various variations in fetal QRS patterns using many tracings of fetal electrocardiogram from dairy cattle during the period from the 5th month of pregnancy to term. A temporary decrease in amplitude without changes in polarity of initial deflection of the QRS was frequently observed in later gestational stages. This variation in amplitude usually occurred after O-line movement and was reversible within a short time. So, this phenomenon may presumably be due to fetal movement. Temporary disappearance of fetal QRS may also be principally due to some kind of fetal movement, so that the angle of fetal heart vector against the lead plane becomes approximately 90 degrees. There were some variations in polarity or amplitude of fetal QRS between one lead and several other leads simultaneously carried out. These would suggest that the electrical potential of the fetal heart may exert more effectively on one lead point and on the other points, or that the fetus itself may leave one lead point to approach another point. Reversal change in polarity of fetal QRS was observed in a long time recordings at middle gestational stages. This may be also caused by some changes of the fetal heart axis due to fetal movement in the uterus. Such fetal movement, however, should be considered to be physiological, because the change in polarity of the fetal QRS is reversible within a short time and the fetal heart rate is invariable. As for the variations in amplitude and polarity of the fetal QRS with advances in pregnancy, variations of the fetal QRS were, in general, characterized by changes in amplitude without changes in polarity in later stages of pregnancy, while in earlier stages inversion of polarity was sometimes observed. The reasons will be explained as follows : in advanced pregnancy the fetal heart development is almost completed and its activation mechanism become stable, but fetal heart position may be effected by physiological fetal movement.
- 北海道大学の論文
著者
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KANAGAWA Hiroshi
Department of Theriogenology, Faculty of Veterinary Medicine, Hokkaido University
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TOO Kimehiko
Department de Medecine Veterinaire dans la meme Faculte
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KAWATA Keiichiro
Department of Veterinary Obstetrics Faculty of Veterinary Medicine Hokkaido University
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Too Kimehiko
Department Of Veterinary Internal Medicine Faculty Of Veterinary Medicine Hokkaido University
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Kanagawa Hiroshi
Department Of Biomedical Science Ontario Veterinary College University Of Guelph
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Kanagawa Hiroshi
Department Of Veterinary Obstetrics Faculty Of Veterinary Medicine Hokkaido University
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KAWATA Keiichiro
Department of Veterinary Obstetrics and Gynecology, Rakuno Gakuen University
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