Urinary Elimination, Fluid Balance & Intake and Output Flashcards
How is balanced maintained?
ingestion, distribution and excretion of water and electrolytes
What system is fluid balanced primarily maintained by?
renal
How much does our intracellular fluid make up?
60%
Interstitial
fluid between cells in the tissue
Intravascular
blood and plasma
transcellular
fluid separated by epithelium (pleural, peritoneal)
Osmosis
movement of water through a semipermeable membrane from an area of lesser solute concentration to one of greater concentration
osmotic pressure
pressure needed to counter the movement of water across a semipermeable membrane from an area of low solute concentration to an area of high concentration
what does decrease in albumin result in?
decrease osmotic pressure
Active trasnport
movement of molecules across a concentration gradient using chemical energy
Where does diffusion happen?
diffusion of oxygen and carbon dioxide between alveoli and lung blood vessels
filtration
uses hydrostatic pressure gradient and results in 2-4L of fluid per day entering the interstitial fluid from intravascular space
What organs does output occur?
kidneys, skin, lungs and GI tract
What is the obligatory water loss per day?
500 mL minimum
Sensible water loss
urine and feces; see and measure
insensible water loss
skin and respiratory system; cant really measure
How much will the kidneys filter out per day?
filters 180L of plasma daily and creates 1.2-1.5L of urine each day
How much do the small intestines manage?
9L of fluid which gets secreted into the GI tract daily and most gets reabsorbed and 100mL is lost in feces daily
What is the fluid intake regulation?
thirst mechanism
Hormonal control of fluid intake?
ADH or aldosterone
ADH release
to increase serum osmolality and act on renal tubules and collecting ducts and make them more permeable to water which increases the amount of water reabsorbed into the blood circulation and decrease amount of water thats lost through urine
Aldosterone release
by adrenal cortex in response to high potassium levels and low sodium levels; counteract hypoyvelemia results, in increased absorption of sodium in distal renal tubules
When are osmoreceptors in the hypothalamus stimulated?
when serum osmolality increases or blood volume decreases
Intake Measures
oral- 1100-1400
Food- 800-1000mL
Metabolism- 300mL
Output measures
Skin (insensible)- 500-600mL
Lungs(insensible)- 400mL
Gi- 100-200mL
Urine- 1200-1500mL
Volume imbalances
disturbances in amount of ECF
Fluid volume deficit (nursing diagnosis)
dehydration, vomitting, decreased oral intake, extreme heat, diarrhea
Fluid volume excess (nursing diagnosis)
heart failure, kidney disease, IV therapy: body cannot regulate the fluid volume
aspects of fluid balance chart
- all intake and output over a 24hr period and 24hr fluid balance (excess or deficit)
- intake: oral fluids, IV, feeding tube
- output: urine, NG drainage, wound drainage, loose stool, vomitus, other drainage tubes
- need to look at trends over time (2-3 days before)
- daily input-output should be about 500mL