門脈血行の周期的変動について
スポンサーリンク
概要
- 論文の詳細を見る
The effects of undulatory changes in the spleen and liver volume, and the effects of tonic and rhythmic contraction of the gut on portal venous flow were investigated in anesthetized dogs. Following results were obtained. 1. The rhythmical contraction of period of 12-57 sec. were observed on the portal vein. It was obtained on extracted preparation and in situ. 2. Active periodic changes in the liver volume caused by injection of Ringer's solution and sod. citrate solution were observed in the dog. Active contraction of liver caused about 10% changes in portal venous pressue. 3. The undulatory changes in the spleen volume effects on the blood flow in the splenic vein. Normal splenic blood flow averaged 27.7 ml/min, but increased to 32.2 ml/min during the period of rhymical contraction of spleen. This increase corresponded to 16.2% of the normal splenic blood flow. 4. Intestinal contraction caused periodicity not only in venous outflow but also in oxygen saturation in venons blood. It was observed in tonic contraction that augmentation of venous outflow synchronized with reduction of oxygen saturation in venons blood and that diminution of venous outflow produced an increase of oxygen saturation in venous blood. In rthythmic contraction, the correlation between venous outflow and oxygen saturation in venous blood could be classified into two patterns. In the first pattern fluctuations of venous outflows corresponded reciprocally to fluctuations of oxygen saturation, and in the second pattern both curves fluctuated parallel to each other. Experiments were also performed influence of the intestinal reflexes on the portal venous flow. It was observed on experiments of cross-circulation system that venous outflow diminished parallel to the loss of intestinal tone during the intestinal inhibitory reflexes, but venouns outflow augmented constantly during the intestinal excitatory reflexes. The mechanisms of the correlation between venous outflow and oxygen saturation in venous blood is discussed on the basis of the particularity of distribution of minute blood vessels and of the autoregulatory systems.
- 広島文化女子短期大学の論文
- 1990-07-10
広島文化女子短期大学 | 論文
- スポーツ選手の食事に関する研究 2報--自転車ロード選手のイタリアサルディニア島における合宿10日間および減量期について
- 外来糖尿病患者の栄養指導3か月後の食事療法実践状況について
- J.S.バッハの鍵盤曲における舞踏リズム--サラバンド
- ヒト胎児腎臓の発生形態--光顕と電顕による観察
- 原発性アルドステロン症 補遺