![]() The compartments all contain solutes dissolved in water. Normal movement of fluid between these compartments is governed by the permeability of the particular tissue membrane and the concentration of molecules located across the membrane barrier. The majority of extracellular fluid is contained within the interstitium. The interstitium, simply defined, is the connective structures and lubricating fluids located between cells. The extracellular compartment is further divided into intravascular fluid (plasma within the vessels) and interstitial fluid (between the cells). ![]() The extracelluar compartment holds the remaining one-third of total body water and 20% of body weight. The larger of the two is the intracellular compartment comprising two-thirds of total body water and 40% of body weight. Body water is distributed between two compartments known as intracellular fluid (ICF) space and extracellular fluid (ECF) space. Geriatric pets will have less while neonates have considerably more, up to 75% of body weight total body water. Unfortunately, many of our critical patients have trauma or disease processes that result in an imbalance between fluid compartments.įor the average adult, nonobese dog or cat, total body water is approximately 60% of body weight. ![]() Unlike the popular home and garden channel TV shows that boast remodeling of room or house structures, remodeling of fluid compartments within the critical care patient is not the effect a clinician desires.
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