Effect of hindlimb isolation procedure on isogravimetric capillary pressure and transcapillary fluid dynamics in dogs.

We measured isogravimetric capillary pressure (Pci) and plasma colloid osmotic pressure (pip) in isolated dog hindlimbs. A very rapid isolation technique and a perfusion technique involving no weight change were developed in order to compare the effects of different isolation procedures. Also, a "previous isolation procedure" (PIP) was used to approximate isolation procedures previously reported; this procedure included (A) anesthesia for 1 to 1 1/2 hours before limb isolation, (B) 1/2 hour of denervation before isolation, and (C) perfusion after isolation for 1/2 hour at an arterial pressure of 100 mm Hg and a venous pressure of 6 mm Hg. These different procedures altered average (+/- SE) capillary pressure and fluid dynamics in the hindlimb as shown in the foly pressure in the intact resting dog hindlimb may be 8 mm Hg below plasma colloid osmotic pressure, or about 9 mm Hg, and that many reported values have been heavily influenced by the isolation technique.