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Chapter 24
Fluid Blance
Question | Answer |
---|---|
Why must the volume and composition of fluids in the body be maintained within narrow limits? | Excess fluids= HTN, CHF, peripheral edema. Depletion of fluids=dehydration, shock Fluid must contain specific amounts of ions/electrolytes and be maintained at particular pH values. Acc of excess acids or bases change pH values can = death. |
What happens when you have a depletion of fluids? | Dehydration, shock. |
What happens when you have excess fluids? | Can lead to HTN, CHF, and peripheral edema. |
Accumulation of excess acid or bases can change pH of body fluids and lead to what? | Death, if left untreated. |
What is the greatest bulk of body fluid? | Water, which serves as the universal solvent in which most nutrients, electrolytes, and minerals dissolve. |
Water can be located in what two compartments? | 1) Intracellular fluid compartment (ICF), water inside cells. (2/3, 40%) 2) Extracellular fluid compartment (ECF), water outside cells (1/3 20%) |
What are the two compartments of extracellular fluid? | 1) Fluid in the plasma (intravascular space) 2) Fluid in the interstitial spaces between cells. |
What is Osmolality? | A solute. Is the measure of dissolved particles or solutes. Laboratory value that can be precisely measured. Normal ranges of Osmolality is 275-295 milliosmols per kilogram (mOsm/kg) |
What is a solute? | Sodium, glucose and urea. They determine osmolality. Sodium is the greatest contributor. |
What is tonicity? | A solution is able to cause a change in water movement across a membrane due to osmotic forces. General term used to describe concentration of IV fluids. |
What is isotonic? | normal plasma levels, have the same concentration as solutes (same osmolality) as plasma. No net fluid shift. |
What is hypertonic solutions? What happens when a hypertonic IV solution is administered? | Contain greater concentration of solutes than plasma. Water moves from Interstitial Fluid C (IFC) -> plasma by osmosis. Causes dehydration. |
What is hypotonic solutions? What happens when hypotonic IV solution is administered? | Have lesser concentration of solutes than plasma(intravascular space). Water moves from plasma-->IFC. Causes hypotension, due to water movement out of vascular system. |
How is water output achieved in the body? | Kidneys, lungs, skin, feces, and sweat. |
How do you maintain water balance? | Water intake must equal water output. |
Fluid deficit disorders cause what? | Shock or dehydration, which are treated by administering oral or IV fluids. |
Fluid excess disorders are treated with what? | Diuretics. Excess fluid, lead to HTN, CHF, and peripheral edema(causes swelling). |