Identify normal functioning of the kidney and laboratory tests that assess kidney function Define renal failure Discuss the causes of acute renal failure and compare those with chronic renal failure Compare prerenal, intrarenal and postrenal conditions Identify the alterations seen in patients, explaining why they exist
Identify nursing measures appropriate to the alterations NORMAL KIDNEY FUNCTION What does the kidney do in terms of? wastes and water balance? Acid base balance? Controlling BP?
Controlling anemia? RENAL FAILURE DEFINED Kidneys no longer function properly Kidneys unable to excrete waste
kidneys cannot concentrate urine Kidneys cannot conserve electrolytes HORMONES WHICH INFLUENCE THE KIDNEY ALDOSTERONE Produced: Action: RENIN/ANGIOTENSIN
Produced: Action: HORMONES WHICH INFLUENCE THE KIDNEY ANTIDIURETIC HORMONE Produced: Action: ERYTHROPOIETIN (EPO)
Produced: Action: IDENTIFYING THE THREE PRIMARY RENAL FUNCTIONS GLOMERULAR FILTRATION:glucose, amino acids,
creatinine, urea, phosphates, uric acid GLOMERULAR REABSORPTION:bicarbonate, phosphates, sulfates, 65% of Na and water, glucose, K, amino acids, H ions, urea GLORMERULAR SECRETION: hydrogen and potassium, remove acids (hydrogen) to maintain appropriate acid base balance, potassium, urea ASSESSMENTS OF RENAL FUNCTION
u/a: negative for glucose, protein, blood, leukocytes, nitrites, ketones Specific gravity: measures concentration of the urine; normal values: 1.010-1.025 Urine osmolality: normal 300-900 mOsm/ kg/ 24 Serum creatinine: 0.6-1.2mg/dl BUN: 7-18mg/dl BUN to creatinine ratio: about 10:1
DIAGNOSTIC ASSESSMENTS CONTINUED STANDARD FOR RENAL FUNCTION: assess glomerular filtration rate (GFR) Norm for this assessment is the creatinine clearance test done over 24 hours: normal rate is 80-125ml/min DEFINITIONS OLIGURIA: urine output is less than 30
ml/hr ANURIA: no urinary output NORMAL URINARY OUTPUT: 15001800ml/day CAUSES OF ACUTE RENAL FAILURE PRERENAL or factors external to the kidney which interferes with renal perfusion (55% cases of ARF) INTRARENAL: conditions that cause direct
damage to renal tissue (35-40% cases of ARF) POSTRENAL: mechanical obstruction in the urinary tract (5% cases of ARF) CAUSES OF RENAL FAILURE CONTINUED Multiple problems may exist at same time AGING
RENAL FAILURE DEFINED To define renal failure ask yourself: How is the kidney functioning with regard to? Excreting nitrogenous wastes Concentrating urine Conserving electrolytes PROBLEMS FOR PATIENT Retention of metabolic wastes
Imbalance of fluid and electrolytes Alterations of sensorium 3 phases of acute renal failure Oliguria Diuresis Recovery OLIGURIC PHASE (lasts 10-14 days)
Calcium deficit and phosphate excess Waste product accumulation Neurologic disorders DIURETIC PHASE (lasts 1-3 wks) Gradual increase of urine output as a result of osmotic diuresis Why does this happen? What is the state of nephron?
Can the kidney excrete wastes? Can the kidney concentrate urine? What would we see in the patient during this stage? RECOVERY PHASE When does this begin? Do all patients recover? GOALS OF TREATMENT
Restore renal function Identify cause Eliminate cause MAINTAINING FLUID AND ELECTROLYTE BALANCE How do we assess fluid excess? How can we control fluid intake? What physical assessments would be done?
What would you expect to see? What laboratory tests would be used to assess client status? NURSING CARE FOR:
Sodium bicarbonate Calcium gluconate IV Dialysis Kayexalate Dietary restriction DIET FOR ACUTE RENAL FAILURE
dietary protein calories K and phosphorus Na Fe
CHRONIC RENAL FAILURE DEFINED Progressive deterioration in renal function resulting in fatal uremia (excess of urea and other nitrogenous wastes in the blood) Irreversible destruction of nephrons Called ESRD (end stage renal disease) Dialysis or transplant
TERMS ASSOCIATED WITH CHRONIC RENAL FAILURE Azotemia: collection of nitrogenous wastes in blood Uremia: azotemia Uremic syndrome: systemic clinical and laboratory manifestations of ESRD Alterations: Chronic Renal Failure Metabolic Disturbances:
Integumentary Disturbances: pruritus,dry,hair brittle, nails thin, UREMIC FROST: white/yellow crystals of urate on skin ALTERATIONS OF CHRONIC RENAL FAILURE CONTINUED Gastrointestinal Disturbances: Anorexia, N&V, metallic taste in mouth, breath smells like ammonia, stomatitis, ulcers/GI bleeding, constipation
Neurological Distrubances: uremic encephalopathy progresses to seizures & coma CHF: from increased workload on heart from anemia, hypertension and fluid overload Uremic pericarditis: pericardium becomes inflammed from toxins ALTERATIONS OF CHRONIC RENAL FAILURE CONTINUED
Respiratory: breath smells like urine: uremic fetor or uremic halitosis Metabolic acidosis: see tachypnea (increased rate) and hyperpnea (increased depth) indicates worsening metabolic acidosis See Kussmaul respirations extreme hyperventilation
NURSING CARE FOR PT WITH CHRONIC RENAL FAILURE FOR ANEMIA: FOR HYPOCALCEMIA FOR FLUID RETENTION AND HYPERTENSION FOR SKIN ITCHING DIETARY RESTRICTIONS FOR CHRONIC RENAL FAILURE
Na K calcium Phosphorus Magnesium DIALYSIS: peritoneal and hemodialysis PERITONEAL DIALYSIS
Diffusion of solute molecules through a semipermeable membrane passing from the side of higher concentration to that of lower concentration Fluids passing through the semi-permeable membrane via osmosis Renal Failure pt has dialysis to remove waste products and to maintain life until kidney function can be restored Dialysis indicated for high levels of K and fluid overload
PERITONEAL DIALYSIS Sterile dialyzing fluid is introduced into the peritoneal cavity Peritoneum is an inert semipermeable membrane The dialyzing solution promotes osmosis leading to diuresis Urea and creatinine are removed NURSING CARE OF PT ON
PERITONEAL DIALYSIS Baseline VS and wgt Assess for fluid overload Maintain highly accurate inflow and outflow records When PD starts the outflow may be bloody or blood tinged This clears within a week/two Effluent should be clear and light yellow
Nursing care during PD Drainage bag is lower than the clients abdomen to enhance gravity drainage Avoid kinking or twisting, ensure clamps are open Reposition client to stimulate inflow or outflow Sitting/standing/coughing: increases intraabdominal pressure
COMPLICATIONS OF PERITONEAL DIALYSIS Respiratory difficulties Hypotension Infection:
peritonitis: see cloudy or opaque dialysate outflow (effluent), fever, abdominal tenderness, pain, malaise, N&V Hypo-albuminemia
Bowel perforation: Bladder perforation: Catheter may get clogged COMPLICATION OF PD: Fibrin Clot formation Fibrin Clot formation Milking the tubing Xray
COMPLICATION OF PD: LEAKAGE Dialysate leakage See with obese, diabetic, older clients, those on long term steroids HEMODIALYSIS Process by which the uremic toxins and accumulated waste products are removed from the blood
HEMODIALYSIS CONTINUED A synthetic semi-permeable membrane replaces the renal glomeruli and tubules and acts as a filter for the impaired kidneys Must have 3 times/week for 4 hours per treatment for rest of life
Access to pts circulation via: AV shunt (less common): external silastic tubing placed in an adjacent artery and vein AV Fistula: internal access using pts own vessels (artery and vein) AV Graft: internal access using a foreign material COMPLICATIONS Hemodialysis vascular access
BLEEDING INFECTION CLOTTING Assessment during Hemodialysis Assess for disequilibrium reaction CAUSE:
due to rapid decrease in fluid volume and BUN levels Change in urea levels can cause cerebral edema and increased intracranial pressure Neurologic complications: HA, N&V, restlessness, decreased LOC, seizures, coma, death PREVENTION: starting HD for short periods with low blood flows
Nursing care pre dialysis Vasoactive drugs which cause hypotension are held until after treatment CHECK WITH MD ABOUT WHICH DRUGS TO BE HELD Know pts BP predialysis Post dialysis nursing care
BP and wgt Hypotension Temperature may also be elevated: If client has a fever Bleeding risk:
KIDNEY TRANSPLANT Involves transplanting a kidney from a living donor or human cadaver to a recipient who has end-stage renal disease and requires dialysis to live POSTOPERATIVE CONCERNS AFTER TRANSPLANT major concern is rejection
Drugs given to suppress immunologic reactions: Imuran, prednisone, cyclosporin (Cyclosporin A) Next concern is infection NRSG CARE POST KIDNEY TRANSPLANT TO DETECT REJECTION: Assess for increased temp, pain or tenderness over grafted kidney
Assess for decrease in urine output, edema, sudden wgt gain Assess for rise in serum creatinine and BUN values
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