鶏胚の発生過程における心電図波形と心形態

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タイトル別名
  • Relationships between the Wave Form of ECG and the Morphological Properties of the Heart in the Developing Chick Embryo
  • ニワトリ ハイ ノ ハッセイ カテイ ニ オケル シンデンズ ハケイ ト ココ

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The relationships between the wave form of ECG and the morphological properties of the heart at various stages of the developing chick embryos were investigated. The electrocardiograms in A-B lead were recorded from the chick embryos for 17 days from the 5th day of the incubation to the day of hatching. The macroscopic morphological properties, i. e. heart, atrial, right and left ventricular weights, length and width of the heart were measured in these embryos. Relationships among these items were discussed. The results obtained were summarized as follows: Ratios of length to width of the heart were maintained at a constant value during the whole process. The relative growth between the heart weight to the embryo weight was designated in the isometry during the 9-day to the 19-day embryos and in the negative allometry before the 9-day as well as after 19-day. Relative values of the atrial weight to the heart weight gradually decreased until the 13-day embryos, and after that these were kept in the stable phase. The relative values of the right ventricular weight to the sum of the left ventricular free wall and the ventricular septum weights slowly decreased until the day of hatching. The cardiac potentials of the 5-day embryo were very low, however, the P wave and the QRS complex were recognized distinctly. The P wave showed biphasic pattern in which the positive element was dominant and the QRS complex indicated the R type in this stage. After that the potentials of the P wave and the QRS complex increased gradually. The deflection of the P wave showed a positive wave, and that of the QRS complex was indicated the Rs type until the 10-day embryo. In the 11-day to 15-day embryos the QRS complex indicated the RS type and the potential of the P wave decreased gradually. On and after the 16-day embryos, the QRS complex was stabilized in the rS type. Maximum potentials of the P wave and the R spike appeared in the 9-day embryo and that of the S spike were recorded in the 16-day. The adult type of the QRS complex was shown on and after the 16-day embryos. From both the morphological and functional points of view, two inflection points were recognized on the 9th and 16th days of incubation. From these results, the cardiac function in the chick embryo was founded completely on the 16th day of incubation. It was presumed that the alterations of the wave forms were corresponded with the developing process of the specific cardiac muscles, and the increments of the amplitude or the duration in each deflection of ECG were related with the growing of the volume of the ordinary cardiac muscles.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 46 (9), 522-530, 1975

    公益社団法人 日本畜産学会

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