Exam 2 ppt Flashcards
(157 cards)
Insensate loss:
fluid loss that you can’t measure. (sweat and breathing) These things are always going on
Electrolytes: cations and anions
Cations (+) Sodium: outside the cells Potassium: mostly inside the cells Calcium Magnesium Hydrogen
Anions (-) Chloride Bicarbonate phosphate sulfate proteinate
How does the body regulate fluids and electrolytes ?
Kidney function Heart and blood vessels Lungs Pituitary Adrenal glands Parathyroid gland Baroreceptors Renin-angiotensin-aldosterone ADH and thirst Osmoreceptors BNP/ANP
Fluids, electrolytes and aging
Physiologic changes
↓Cardiac, renal, respiratory function
-Decreased thirst mechanism
-Alterations in ratio of body fluids to muscle mass
-Increased sensitivity to changes in fluids and electrolyte levels
-Frequent medication use that affects
-Renal function
-Cardiac function
-The elderly are particularly at risk for electrolyte imbalances
-Thirst mechanism doesn’t work as well
-Check skin turgor on forehead and sternum
Hypovolemia: Fluid volume deficit causes
Occurs when loss of ECF volume exceeds the intake of fluid
Mild – 2% of body weight loss
Moderate – 5% of body weight loss
Severe – 8% or more of body weight loss
Hypovolemia: Fluid volume deficit signs and symptoms
- Acute weight loss/flat neck veins
- Decreased skin turgor-lost elastin in the skin. Check for turgor in elderly on forehead and sternum
- Oliguria/concentrated urine
- Postural hypotension
- Weak, rapid, heart rate/circulatory collapse
- Increased temperature
- Decreased central venous pressure
Hypovolemia: Fluid volume deficit treatment
-First, find the cause (vomiting, diarrhea) then replace fluids. If someone is low because they fell, IV then push fluids orally. Vomiting excessively will also change pH, electrolytes, and fluid volume.
-Mild hypovolemia: use oral route if possible
-Acute or severe: Isotonic or hypotonic IV solutions
-Nursing: I & O, daily weights, vital signs, urine output, skin turgor, LOC
-Normal Hb: 12-14 in women 14-16 in men
drop in Hb could be bleeding, concentrated blood can skew results, dehydration
30 mls (avg) is normal urine output
Hypervolemia: Fluid volume excess contributing factors
People most at risk: pts with renal failure (can’t eliminate fluid) and Heart failure (can’t pump fluid)
An isotonic expansion of the ECF caused by the abnormal retention of water and sodium in approximately the same proportions in which they normally exist in the ECF
Contributing factors: CHF Renal Failure Cirrhosis of the liver Excess sodium intake Our job is to frequently assess to be able to treat these things. Measure weight daily: 1L of fluid=1kg
System Specific assessment Fluid Volume Excess : assessment findings
↑ pulse ↑ B/P ↑ weight ↑ edema ↑ ascites ↑ crackles in lungs ↑ dyspnea ↑ confusion JVD
Normal/desired expected Outcome – Fluid Balance
Pulse within client norm - B/P within client norm Weight within client norm ↓ edema ↓ ascites ↓ crackles in lungs ↓ dyspnea ↓ confusion
“Third spacing”
-Fluid is trapped in the interstitial space.
-Trapped in a space that is not beneficial to the body. (ie: ascietes from liver failure)
-Remember that fluids shift
-Anytime theres an inflammatory response, fluid is sent to that area. You can start third spacing small amounts
L-oss of albumin or protein leads to decreased oncotic pressure, causing fluid to “leak” from the intravascular into the interstitial space.
Normal albumin in the body:
3.5-5.0 (know the low end.)
When albumn is 1.7 or less you develop
anasarca: total body edema. handprint in the middle of their back if you try to turn them.
extremely malnourished patients (like those in the hospital) have reduced albumin
Most of the proteins are carrying things
ie transthyroiretin transports thyroid hormone
Examples of what can cause decreased albumin
Burns Peritonitis Cirrhosis Alcoholism Malnutrition Long/complex surgeries
causes of hyponatremia: Na+
- Caused by active losses or by dilution hyponatremia
- We need Na for nerve stimulation and muscle contraction
Hyponatremia manifestations
Clinical manifestations depend on the cause, magnitude, and speed of the deficit but are primarily neurological :
- Nausea and malaise
- Lethargy, headache
- Decreased level of consciousness: confusion
- Seizure, coma, death (cerebral edema)
- Brain herniation and death
changes can be from: n/v, diarrhea, suctioning, diuretics, fluid overload, etc
Fatal levels at 115/severe at 125
HYPONATREMIA: FIRST - Priority Nursing Interventions
S odium intake , Seizure precaution especially in high risk levels (125)
O verload—restrict water intake
D aily weight, diuretics, drugs (what are we doing that might cause it?)
I ntake & Output
U se isotonic fluids to restore ECF
M onitor: blood pressure, N/V, HR, dry mucous membranes / LOC
Look for CNS changes Increase sodium IV fluids (not 3% because its so hypertonic you risk damaging myelination in neurons)
Priority nursing intervention for hyponatremia
Protect airway:
suctioning: due to N/V and LOC
to get emesis out for aspiration risk reduction
in case of seizure
Hypernatremia: Na+>145 mEq/L overview
This is rare. But if you have a patient who can’t respond to their thirst mechanism or their thirst mechanism is impaired: dehydration=sodium level increases.
Can be caused by a gain of sodium in excess of water or by a loss of water in excess of sodium
Fluid deprivation in patients who cannot perceive, respond to, or communicate their thirst.
Diabetes insipidus
Acute: associated with rapid decrease in intercellular water and brain volume and causes an osmotic shift of free water out of the cell
Hypernatremia: Na+>145 mEq/L dangerous levels
ICU pts. increased mortality of 38-48% if their sodium reaches or exceeds 150.
Hypernatremia: Na+>145 mEq/L manifestations
Decreased urine output, Dry mouth dehydration, swollen tongue
Restless, irritable, confusion, delusions, hallucinations, seizures
Increased heart rate, temp, and flushed skin
Edema (peripheral and pulmonary)
Deep muscle reflexes increased
Hypernatremia: Na+>145 mEq/L treatment
I & O, daily weights Oral hygiene Monitor sodium intake Monitor vitals and neurological symptoms Monitor urine output
Normal potassium levels
3.5-5.0
Hypokalemia: serum K+ causes
Caused by active losses of potassium or insufficient intake
Needed for nerve stimulation and muscle contraction
Main sources of losses are:
Urinary loss
Gastrointestinal loss
Redistribution from extracellular to intracellular space
diuretics like lasix
starvation
trauma
alkalosis
laxative use and abuse (especially the elderly)
Hypokalemia: serum K+ s/s
low potassium will cause a flat or inverted T wave (nicknamed U wave)
Muscle weakness
Severe hypokalemia can cause DEATH through cardiac or respiratory arrest
Skeletal muscle weakness, cramping
U Wave EKG changes, arrythmias, inverted T waves
Constipation, ileus, hypoactive bowel sounds, N/V
Toxicity of digitalis glycosides
Irregular, weak pulse
Orthostatic hypotension
Numbness and tingling (paresthesia)