[Changes in the hydrodynamic resistance of collaterals after ligation of the femoral artery].

After ligation of the femoral artery in 12 dogs anatomical changes of the collaterals 1 month after the operation are accompanied with 18-fold decrease of hydrodynamic resistance in them as compared to the initial one. The shifts observed in 96% are the results of dilatation occurring in the intramuscular interarterial anastomoses. Dilatation of the intramuscular arteries, situating more distally to the anastomosis zone and experiencing a decreased arterial pressure, is also observed, as it is in proximal vessels, situating in the zone of an increased blood pressure. Despite the essential shifts, the blood flow capacity of the collaterals even 1 month after the operation is still 500 times as small as that of the intact femoral artery.