Renal (Exam 3) Flashcards
Percentage of the body weight that is water?
60% TBW
2 components of ECF
- ISF
- Plasma
Name the body fluids that is more immediately altered by kidneys
ECF
What mediates Osmolar homeostasis?
- Osmolarity sensors in anterior hypothalamus
Name (3) actions of Osmolar Homeostasis
- Stimulates Thirst
- Causes Pituitary Releases of Vasopressin (ADH)
- Cardiac Atria releases ANP–> acts on kidneys to release Na+/H20 and promote excretion.
Volume homeostasis is mediated by _____________.
Juxtaglomerular apparatus.
How does the Juxtaglomerular appartatus mediated volume homeostasis?
- JGA senses changes in volume
- ↓Vol @ JGA triggers–> RASS→Na+/H20 reabsorption
Normal Sodium Level
135-145
Sodium Levels that are acceptable for Surgery
125-155
Underlying causes for Abnormal Sodium levels
- hypovolemia
- Euvolemic
- Hypervolemic
Na/H20 loss, diuretics, GI loss, burns and trauma cause __________.
Hypovolemia
Salt restriction, endocrine related – hypothyroid and SIADH all cause ________
Euvolemia
What percentage of hospitalize patients are hyponatremic?
- 15%
Over fluid-resuscitation and ↑endogenous vasopressin are 2 common cause of __________ in the hospital.
- hyponatremia
Asymptomatic, headaches, nausea, vomiting, fatique, confusion, muscle cramps and depressed reflexes are all symptoms of a Sodium level of ____ - ______ mEq/L.
- 130-135 mEq/L
Malaise, unsteadiness, headache, nausea, vomiting, fatique, confussion and muscle cramps are all symptoms of a Sodium level of ___ - _____ mEq/L
- Sodium 120-130 mEq/L
Headache, restlessness, lethargy, seizures, brain-stem herniation, respiratory arrest and death are all symptoms of a Sodium level < _______ mEq/L.
< 120 mEq/L
The most severe consequences of hyponatremia include….
- Seizures
- coma
- death
You can treat ______ by treating underlying conditions (volume status), electrolyte drinks, normal saline, diuretics and hypertonic saline.
Hyponatremia
Hypertonic Saline/3% NaCl is given at a rate of ___ ml/hr over ___ hours.
- 80 ml/hr over 15 hours
Maximal amount of Na correction is ___ mEq/L/hr.
1.5 mEq/L/hr
________________ syndrome is the rapid correction of sodium, > 6mEq in 24 hours.
- Osmotic Demyelination Syndrome.
Consequences of Osmotic Demyelination Syndrome
- Permenant Neuro damage
Hyponatremic Seizures are treated with _____ ml/kg of 3% over ____ minutes until seizure has resolved.
- 3-5 ml/kg
- 30 minutes
How often should you check NA levels while replacing?
- Every 4 hours
Excessive evaporation, Poor oral intake, overcorrection of hyponatremia, Diabetes Insipidus, GI loss and Excessive sodium bicarb are all causes of ___________________
hypernatremia
Orthostasis, Restlessness, lethargy, tremor/muscle twitching/spasticity, seizures, and death are symptoms of ______________.
- Hypernatremia
Treatment of Hypervolemia
- Hypovolemia: Normal Saline
- Euvolemic: water replacement (po or D5W)
- Hypervolemic: diuretics
VS, UOP, Turgor and CVP are (4) ways to assess _______ ________.
volume status
Na levels should be reduced at a rate of <____ mmol/L/hr and < ____ mol/L/day to avoid cerebral edema, seizures and neurologic damage.
- ≤0.5 mmol/L/hr,
- ≤ 10 mmol/L per day
Normal Potassium Levels
3.5 - 5.5
____ percentage of potassium is found in the ECF?
Serum Potassium reflects ________ potassium regulation more than total body potassium.
- < 1.5%
- transmembrane
Name the relationship between Aldosterone and Potassium
↑Aldosterone = ↓Potassium
In renal _______, potassium excretion declines and excretion shifts towards ____ system
- failure
- GI system
Low PO intake, Renal Loss, GI loss, Intracellular shifts, DKA, HCTZ, and Excessive Licorice are all common causes of _____________.
- Hypokalemia
(3) Major Causes of ________ are renal loss, GI loss and transcellular shifts
hypokalemia
____can cause muscle weakness/cramps, illeus, dysrhthmias and U-waves
Hypokalemia
Best ways to correct Hypokalemia is to treat _________ causes, ____> IV replacement and ___-____ mEq/L/hr IV
- Undelying causes
- PO > IV
- 10-20 mEq/L/hr IV
10 mEq IV K increased Serum K+ by _____ mmol/L
0.1
Excessive insuline, beta blockers, Bicarb, hyperventilation and diuretics should all be avoided in patient’s with __________.
Hypokalemia
The following are all causes of _________:
1. Renal Failure
2. Hypoaldosteronism
3. Drugs that inhibit RASS
4. Drugs that inhibit K excretion
5. Depolarizing NMB (Succs)
6. Acidosis (Respiratory/Metabolic)
7. Cell death (trauma/tourniquet)
8. Massive blood transfusion
Hyperkalemia
____ can cause malaise, and upset stomache chronically, while acute can cause skeletal muscle paralysis, decreased fine motor movements and cardiac dysrhythmias.
Hyperkalemia
EKG progressionof Hyperkalemia
- peaked T wave (1)
- P wave disappearance (2)
- prolonged QRS complex (3)
- sine waves (4)
- asystole (5)
Dialyze (24 hrs prior to surgery), Calcium, hyperventilation, insulin w/glucose, Bicarb loop diuretics and Kayexalate are all treatments for ________________.
Hyperkalemia
_________ is the 1st initial treatment of hyperkalemia
Calcium
______ is the fastest treatment for Hyperkalcemia.
Hyperventilation
Hyperventilation corrects pH: ↑pH by 0.1, ↓K+ by ______ mmol/L
- 0.4-1.5 mmol/L
Succinycholine, hypovolemia, LR, and Potassium containing IV fluids should all be avoid with _________.
hyperkalemia
___% of calcium is in the ECF and ____ % of calcium is in the bones
- 1% in ECF
- 99% in bones
Normal iCal levels
1.2 - 1.38 mmol/L
____and ___ can affect Ionized Calcium levels
- albumin
- pH
Parathyroid hormones, Vitamin D and Calcitonin are hormones that regulate _________.
Calcium
Parathyroid Hormone increases ____ absorption, Renal reabsorption and _____ absorption of calcium
- GI
- Renal
- bone
Vitamin D augments_________ Ca++ absorption.
- intestinal
Calcitonin _____bone reabsorption of Calcium
inhibits
↑ Parathyroid hormone (PTH) secretion, magnesium deficiency, low Vitamin D, renal failure and massive Blood transfusion are all common causes of ___________ .
Hypocalcemia
Majority of patients with hypercalcemia have ______- parathyroid or ____________.
- hyper-parathyroid: Cal <11
- cancer: Cal >13
Vitamin D intoxication, Milk-alkali syndrome, and Granulomatous disease are all less common causes of ______________ .
Hypercalcemia
Confusion, lethargy, hypotonia/↓DTR, abd pain, N/V, short QT and hypercalciuria and nephrolithias area all signs/symptoms of ____________ .
Hypercalcemia
Parasthesias, irritability, HoTN, seizures, myocardial depression, Prolonged Qt and Post-Parathyroidectomy– lanyngospasm are signs and symptoms of ____________ .
hypocalcemia
Low dietary intake or absorption and renal wasting are (2) Causes of _____.
Hypo-magnesium
Muscle weakness or excitation, seizures, and ventricular dysrhythias are all symptoms of ________ .
hypomagnesium
Hypomagnesium is given in _____ infusion for less severe symptoms and ___ grams Mag Sulfate for Torsades/seizures
Depends on degress of severity
* slow infusions for less severe
* Torsades/seizures –> 2Gr Mag Sulfate
____ is very uncommon and is generally due to overtreatment.
Hypermagnesium