Wk 5: Fluids&electrolytes/skin disorders/ WBC/Anti-fungal Flashcards
what do body fluids do?
transport nutrients & waste from cells
solvent for electrolytes
maintains body temp
role in digestion, elimination, acid-base balance, lubricant of joints
what is body fluid?
It is plasma:
water
glucose
electrolytes
proteins
how much of the adult body is water?
50-60%
intracellular
inside the cells
extracellular
outside the cells
interstitial fluid
between cells
(interstitial and intravascular fluid)
intravascular fluid
plasma
osmosis
-moving water from low to high concentration gradient
-moves across semipermeable membrane
diffusion
movement of molecules from high to low concentration, until equal
what is the difference between osmosis and diffusion?
osmosis is the movement of liquids to even out the concentration gradient, while diffusion is the movement of molecule to even out the concentration gradient.
what is osmotic pressure?
the amount of pressure needed to prevent movement of water across a cell membrane
what are colloids
substances that increase colloid oncotic pressure
-move fluid from interstitial to plasma
what are the three primary colloids ?
albumin *
globulin
fibrinogen
what causes your colloid oncotic pressure to decrease?
age and malnutrition
hydrostatic pressure
push fluid OUT of capillaries
force of FLUID against cell membrane
-generated by BP
-water pushed out of capillaries to interstitial space
-at arterial end of capillaries
-increases filtration
-aids in nutrition supplementation
Oncotic pressure (colloid pressure)
*pulls fluid INTO capillaries *
force d/t ALBUMIN
caused by plasma colloid
moved from vascular place to tissue space
at venular ends of capillaries
removing metabolic waste
what is an electrolyte?
substances that are electrically charged when inside a solution
(+)
T/F: if there is a change in one electrolyte, it can affect the balance of the rest?
true
what influences electrolytes ?
fluid balance
acid base balance
nerve impulses
muscle contraction
heart rhythm
other cell functions
concentrations of electrolytes are dependent on what factors
electrolyte intake, absorption, distribution, excretion
what electrolytes are primarily inside the cell?
potassium (+)
Magnesium (+)
Phosphorous (-)
What electrolytes are primarily outside the cell?
Sodium (+)
Chloride (-)
Bicarbonate (-)
what is the normal lab values for sodium?
136-145
what is the normal lab values for potassium?
3.5-5.0
what is the normal lab values for magnesium?
1.7-2.2
what is the normal lab values for calcium?
9-11
what is the normal lab values for phosphate?
3.2-4.3
what electrolyte is the key factor in influencing water distribution throughout the body?
sodium
causes of hyponatremia
GI loss (D/V/fistulas/NG suctioning)
Renal loss (diuretics, insufficiency)
Skin loss (burns/ wound damage)
fasting diets
polydipsia
excess hypotonic fluid
S/Sx of hyponatremia
confusion/AMS
anorexia, Wk
Sz/coma
Dilutional hyponatremia
HYPERvolemia
increased BP
weight gain
bounding/rapid pulse
increased urine SP gravity
depletional hyponatremia
HYPOvolemia
decreased BP
tachycardia
dry skin
weight loss
low urine Sp gravity
when giving sodium bicarbonate does it increase or decrease the pH levels in your urine and blood?
increases
why would you give someone sodium bicarbonate?
they are experiencing metabolic acidosis
why are there so many drug to drug interactions with sodium bicarbonate?
b/c a lot of drugs are diluted with sodium solutions
what are some causes of HYPERnatremia?
IV fluids, tube feedings
near drowning in salt water
not enough water intake or too much water loss
D, F, heat stroke
cognitively impaired
profound diuresis
S/Sx of hypernatremia
AMS/ALOC/ confusion
Sz/coma
extreme thirst
dry& sticky mucus membranes
muscle cramps
why do you have to gradually achieve a normal sodium level over 48 hours ? (in regards to hypernatremia)
too quick= damage to brain cells
-avoid edema of cerebral cells
what does potassium help regulate?
-cell excitability and electrical status (cardiac)
-controls intracellular osmolality
what is our main source of K+ intake?
what is our main source of K+ loss?
-diet
-kidneys
what are some causes of hypokalemia?
renal or GI loss (diuresis)
acid base disorders
S/Sx of hypokalemia
cardiac rhythm disturbances (lethal)
Wk, leg cramping
decreased bowel motility/constipation/N/ileus
how do you treat hypokalemia?
KCL
PO or IV, IV MUST ALWAYS BE DILUTED
what is a contraindication for KCL?
renal failure
what are some causes of hyperkalemia?
decreased potassium output (renal failure)
burns/crush injury/sepsis (anything with massive cell injury)
K+ sparing diuretics, ACE, ARB’s, NSAIDS
S/Sx of hyperkalemia
cardiac rhythm disturbances
Wk, cramps
Abd cramps, D,V
magnesium
-stabilizes cardiac muscle cells by controlling movement of K+
-stabilizes smooth muscles
causes of hypomagnesemia
diuresis, GI/renal loss, limited intake, alcohol abuse, pancreatitis, hyperglycemia
S/Sx of hypomagnesemia
hyperactive reflexes, confusion, cramps, tremors, seizures
nystagmus
causes of hypermagnesemia
increased intake alongside renal failure.
ex: ESRD pt who takes milk of mag
OB pt
S/Sx of hypermagnesemia
lethargy, floppiness, weakness, decreased reflexes, flushed/warm skin, deceased pulses decreased BP
hormones released from _____ control the amount of calcium that that released and absorbed by the bone
thyroid and parathyroid glands
where is a majority of calcium found?
in the bones (99%)
what are two distinctive signs of hypocalcemia?
- positive Chvostek’s sign (facial twitch)
- positive Trousseau’s sign (BP)
Trx of hypocalcemia
IV calcium
oral calcium
what are two causes of hypercalcemia?
hyperparathyroidism
cancers
S/Sx of hypercalcemia
sedative
fatigue/ lethargy
confusion
weakness
Sz/coma
kidney stones
Trx of hypercalcemia
hydration
increased urine output
diuretics and NaCL
dialysis ( in renal failure)
Phosphorus has a role in forming what?
-bones
-ATP formation
-part of DNA/RNA formation
Hypophosphatemia causes
decreased absorption, antacid OD, severe Diarrhea, increased kidney elimination, malnutrition (EtOH, TPN)
Or Calcium level changes
S/Sx of hypophosphatemia
tremor, paresthesia, confusion/coma, Sz, wk, joint stiffness, bone pain, hemolytic anemia, platelet dysfunction, impaired WBC function