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NUR 265 Advanced Exam 1 Review, Complete Solution
Anatomy of the Kidney:
- The nephron is the functional unit of the kidney.
- Normal GFR is 120-125.
- If 75% of nephrons quit = renal insufficiency.
- Kidneys are sensitive to changes in cardiac output. VOLUME DEPENDENT. A decrease in uri...
complete solution anatomy of the kidney the nephron is the functional unit of the kidney normal gfr is 120 125 if 75 of nephrons quit renal insufficiency
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NUR 265 Advanced Exam 1 Review, Complete
Solution
Anatomy of the Kidney:
- The nephron is the functional unit of the kidney.
- Normal GFR is 120-125.
- If 75% of nephrons quit = renal insufficiency.
- Kidneys are sensitive to changes in cardiac output. VOLUME DEPENDENT. A decrease
in urine output indicates a decrease in cardiac output.
- If the SBP is below 70 for over 40 minutes, the kidney will become hypo then ischemic.
- If the SBP drops, the arterioles dilate. If the SBP elevate, arterioles constrict.
Normal Functions of the Kidney:
- Regulation of Water: Thirst regulates body fluid. Aldosterone- excretes K and
reabsorbed NA. ADH- reabsorbs water, is water conserving. ANP- inhibits NA and
reabsorbs water. A decrease in volume causes as increase in aldosterone.
➔ When encouraging the patient to drink, provide a GOAL.
- Excretion of Metabolic Waste: Reabsorbed = water and electrolytes. NOT reabsorbed
= creatinine, urea, lactic acid, and ketones. Check creatinine and BUN to assess kidney
function
➔ Lactic acid is a byproduct of metabolism. When the lactic acid is high in
decrease kidney function, these patients have soreness everywhere. *give them
water.
- Regulation of Acid-Base Balance: The kidneys are 2nd place after the lungs. They
excrete hydrogen and reabsorb bicarb.
- Regulation of Blood Pressure: Maintain VOLUME. Renin-Angiotensin- vasoconstricts
then releases aldosterone. Aldosterone. Prostaglandins- vasodilatation. Bradykinins-
vasodilation and vascular permeability.
- RBC Synthesis: Renal Erythropoietin Factor stimulates bone marrow to make RBCs.
➔ A dialysis patient is often anemic.
- Regulation of Electrolytes: effecting neuro, cardiac, mental, and GI.
Electrolytes:
- Sodium NA: 135-145. Hypo = change in LOC, seizures, and vascular collapse. Hyper =
dehydration. Treat hyper with diuretics, D5W because glucose pulls NA out. Correct
the problem slowly to avoid cerebral edema. 48 hours or more.
- Potassium K: 3.5-5.2. Hyper = MI, chemo, autotransfusion (we did it), crushing
injuries. Hypo = diuretics, diarrhea, and GI suctioning. *CARDIAC DYSRHYTHMIAS*
➔ No K to renal patients, if the kidney is not working correctly, they’re not regulating
levels causing build up. Monitor closely, and give slowly. Pt should be on monitor.
Cardiac patients should have an increase K to support cardiac functioning. NO
,PUSH.
, - Calcium Ca: 8.5-10.2. Needed for nerve impulses, cardiac contraction, blood clotting,
and bones and teeth growth. Hypo = laryngospasm (AIRWAY), and respiratory
collapse. Transfusions decrease Ca. Basic Metabolic Panel is not accurate. A decrease
in Ca indicates a decrease in albumin.
➔ Chovskeys-
➔ Trouvosels-
- Magnesium Mg: 1.8-2.4. Hyper = decease reflexes, hypertension, and cardiac
dysrhythmias. Hypo = increase in muscular and CNS activity.
➔ K needs Mg. Give Mg first so K can be transported into the cells.
- Phosphorus: 2.5- 4.9. Where Ca is… Phos is NOT! Opposite s/s as Ca.
Ask our Patient: current problem, what’s their normal, how much fluid do you drink daily, what
meds do you take, other health issues, and family history.
Nephrotic Syndrome: (pg. 1379 chart 67-3 sudden onset of sxs)
- Pathophysiology – immunologic kidney disorder where the glomerular permeability
increases so larger molecules pass through the membrane into the urine and are then
excreted. This causes a massive loss of protein into the urine, edema formation, and
decreased plasma albumin levels. Many agents and disorders are possible causes of
NS. All glomerulonephritis diseases have features of nephrosis.
- Causes – most common is glomerular membrane changes is altered immunity with
inflammation. Defects in glomerular filtration can also occur as a result of genetic
defects of the filtering system, like Fabry disease. glomerulonephritis, glomerular
injury, neoplastic disease, diabetes, and altered liver function (can also occur with NS,
resulting in increased lipid production and hyperlipidemia).
- Symptoms – Severe proteinuria, hypoalbuminemia causing EDEMA, weight
gain, dyspnea, HTN, orthostatic, ascites, decrease output.
- ACUTE = related to medications. CHRONIC = related to processes of disorders over time.
- Interventions - Tx of the underlining cause related to meds. 24-hour urine catch daily
weights, abdominal girths, I&O, monitor electrolytes. ORDERS – diuretics, steroids,
low NA and protein diet, replace albumin.
- Management varies, depending on which process is causing the disorder (identified by
a kidney biopsy). Excess immunity can improve with suppressive therapy using steroids
and cytotoxic or immunosuppressive agents. Angiotensin-converting enzyme
inhibitors (ACEIs) can decrease protein loss in the urine and cholesterol-lowering drugs
can improve blood lipid levels. Heparin may reduce vascular defects and improve
kidney function. Diet changes are also prescribed – if glomerular filtration rate (GFR) is
normal, dietary intake of proteins is needed. If GFR is decreased, protein intake needs
to be decreased. Mild diuretics and sodium restriction may be needed to control the
edema and hypertension. Assess the patient’s hydration status because vascular
dehydration is
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