Biomaterial Database

Sustained venous occlusion plethysmography: effects on protein osmotic pressure, intravascular volume, and capillary filtration. 1984

H C Dittrich, and W W Peck, and R A Slutsky

In six acutely anesthetized, mechanically ventilated mongrel dogs, we evaluated sequential changes (over 30 minutes) of sustained forelimb venous occlusion (occlusion pressures 30 to 65 mm Hg) on strain gauge dimension, radionuclide blood pool emissions, and venous, subcutaneous, and intramuscular pressures (Wick technique). Forelimb intravascular volume (assessed by decay-corrected radionuclide counts/unit time) changed by a mean of only -1.2 +/- 2.8% (+/- SEM) and thus was ignored in the calculation of filtration rate. Forelimb (distal to the occlusion site) hematocrit changed insignificantly (45.3 +/- 1.4% at the control point to 48.2 +/- 1.1% at 30 minutes), colloid osmotic pressure rose slightly 19.4 +/- 1.4 mm Hg to 22.7 +/- 1.6 mm Hg, p less than 0.01), and serum osmolality remained unchanged. During sustained occlusion, venous pressure remained constant, subcutaneous pressure rose (-0.7 +/- 1.2 mm Hg control vs 0.5 +/- 1.4 mm Hg at 30 minutes, p less than 0.05), and intramuscular pressure also rose (-0.4 +/- 1.1 mm Hg to 2.6 +/- 1.6 mm Hg, p less than 0.01). Driving pressure, defined by venous pressure - oncotic pressure less the average of intramuscular and subcutaneous pressure declined slightly over the 30 minutes of the study (27.8 +/- 5.5 mm Hg to 23.3 +/- 1.3 mm Hg, p less than 0.05). The relationship between either the initial driving pressure or the initial difference between venous and protein osmotic pressure correlated (r = 0.83 for both) well with strain gauge estimates of capillary fluid flux (evaluated by the change in forelimb strain gauge dimension over time and given as cc/100 cc forelimb volume/min).(ABSTRACT TRUNCATED AT 250 WORDS)

UI	MeSH Term	Description	Entries
D009132	Muscles	Contractile tissue that produces movement in animals.	Muscle Tissue,Muscle,Muscle Tissues,Tissue, Muscle,Tissues, Muscle
D009997	Osmotic Pressure	The pressure required to prevent the passage of solvent through a semipermeable membrane that separates a pure solvent from a solution of the solvent and solute or that separates different concentrations of a solution. It is proportional to the osmolality of the solution.	Osmotic Shock,Hypertonic Shock,Hypertonic Stress,Hypotonic Shock,Hypotonic Stress,Osmotic Stress,Hypertonic Shocks,Hypertonic Stresses,Hypotonic Shocks,Hypotonic Stresses,Osmotic Pressures,Osmotic Shocks,Osmotic Stresses,Pressure, Osmotic,Pressures, Osmotic,Shock, Hypertonic,Shock, Hypotonic,Shock, Osmotic,Shocks, Hypertonic,Shocks, Hypotonic,Shocks, Osmotic,Stress, Hypertonic,Stress, Hypotonic,Stress, Osmotic,Stresses, Hypertonic,Stresses, Hypotonic,Stresses, Osmotic
D010991	Plethysmography	Recording of change in the size of a part as modified by the circulation in it.	Plethysmographies
D011312	Pressure	A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Pressures
D001798	Blood Proteins	Proteins that are present in blood serum, including SERUM ALBUMIN; BLOOD COAGULATION FACTORS; and many other types of proteins.	Blood Protein,Plasma Protein,Plasma Proteins,Serum Protein,Serum Proteins,Protein, Blood,Protein, Plasma,Protein, Serum,Proteins, Blood,Proteins, Plasma,Proteins, Serum
D001810	Blood Volume	Volume of circulating BLOOD. It is the sum of the PLASMA VOLUME and ERYTHROCYTE VOLUME.	Blood Volumes,Volume, Blood,Volumes, Blood
D002199	Capillary Permeability	The property of blood capillary ENDOTHELIUM that allows for the selective exchange of substances between the blood and surrounding tissues and through membranous barriers such as the BLOOD-AIR BARRIER; BLOOD-AQUEOUS BARRIER; BLOOD-BRAIN BARRIER; BLOOD-NERVE BARRIER; BLOOD-RETINAL BARRIER; and BLOOD-TESTIS BARRIER. Small lipid-soluble molecules such as carbon dioxide and oxygen move freely by diffusion. Water and water-soluble molecules cannot pass through the endothelial walls and are dependent on microscopic pores. These pores show narrow areas (TIGHT JUNCTIONS) which may limit large molecule movement.	Microvascular Permeability,Permeability, Capillary,Permeability, Microvascular,Vascular Permeability,Capillary Permeabilities,Microvascular Permeabilities,Permeabilities, Capillary,Permeabilities, Microvascular,Permeabilities, Vascular,Permeability, Vascular,Vascular Permeabilities
D004285	Dogs	The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)	Canis familiaris,Dog
D005552	Forelimb	A front limb of a quadruped. (The Random House College Dictionary, 1980)	Forelimbs
D006400	Hematocrit	The volume of packed RED BLOOD CELLS in a blood specimen. The volume is measured by centrifugation in a tube with graduated markings, or with automated blood cell counters. It is an indicator of erythrocyte status in disease. For example, ANEMIA shows a low value; POLYCYTHEMIA, a high value.	Erythrocyte Volume, Packed,Packed Red-Cell Volume,Erythrocyte Volumes, Packed,Hematocrits,Packed Erythrocyte Volume,Packed Erythrocyte Volumes,Packed Red Cell Volume,Packed Red-Cell Volumes,Red-Cell Volume, Packed,Red-Cell Volumes, Packed,Volume, Packed Erythrocyte,Volume, Packed Red-Cell,Volumes, Packed Erythrocyte,Volumes, Packed Red-Cell