Urinary System, Fluids and Electrolytes Flashcards
Straw colored urine with mild odor
normal urine spec gravity 1.010 to 1.050
Cloudy Urine
may indicate the presence of large amts of protein, blood, bacteria and pus
Dark urine
may indicate hematuria, excessive bilirubin or highly concentrated urine
unpleasant or unusual odor
infection or result from certain dietary components or medication
Urinary Infection
heavy purulence and presence of gram-neg and gram-pos
Hematuria
Blood in urine
small amt: infection, inflammation, or tumors in urinary tract
large amt: increased glomular permeability or hemorrhage
proteinuria / albuminuria
leakage of albumin or mixed plasma proteins into filtrate due to inflammation and increased GFR
bacteriuria
Bacteria in urine
infection in urinary tract
Urinary casts
microcopic sized molds of teh tubule, consisting of one or more cells, bacterial, protein and others
indicated inflammation of kidney tubules
specific gravity
indicates ability of tubules to concentrate urine
low spec gravity = dilute urine (with normal hydration)
high spec gravity = concentrated urine (with normal hydration
Glucose and ketones
found when diabetes mellitus is not will controlled
High serum urea or serum creatinine
indicate failure to excrete nitrogen wastes
caused by decreased GFR
Metabolic acidosis
indicates decreased GFR
failure of tubules to control acid-base balance
Anemia
indicates decreased erythopoietin secretion and/or bone marrow depression
Electrolytes
depend on related fluid balance
antibody level
antistreptolysin O or antisteptokinease titers
used to diagnose poststrep. glomerulonephritis
Elevated renin levels
indicate kidney as a cause of hypertension
incontinence
loss or voluntary control of the bladder
enuresis
involuntary urination by child age older than 4
-often related to developmental delay, sleep pattern or psychosocial aspect
Stress incontinence
common in women
increased intra-abdominal pressure forces urine through sphincter
coughing, lifting, laughing, multiple pregnancies
overflow incontinence
incompetent bladder sphincter
older adults
- weakened detrusor muscle may prevent complete emptying of bladder
spinal control injuries or brain damage
- neurogenic bladder - may be spastic or flaccid
- interference with CNS and ANS voluntary controls of the bladder
Retention
inability to empty the bladder
may be accompanied by overflow incontinence
spinal cord injury at sacrallevel blocks micturition reflex
may follow anathesia
Urinary Tract infections
very common infections urine is an excellent growth medium lower urinary tract infections - cystitis (bladder) - urethritis (urethra) upper urinary tract infections - pyelonephritis (Kidneys, upper tract) common causative organism - e. coli
People who get UTIs
Most common in women - shortness of urethra and proximity to anus Older men - prostatic hypertrophy -urine retention Congenital abnormalities in children Other common predisposing factors - incontinence -retention of urine -direct contamination with fecal material
Cystitis and Urethritis
bladder wall (cystitis) and urethra (urethritis) are inflammed
- hyperactive bladder and reduced capacity
pain is common in pelvic area
Dysuria, urgency, frequency, and nocturia
systemic signs may be present
- fever, malaise, nausea, leukocytosis
Urine is cloudy with unusual odor
Urinalysis indicates bacteriuria, pyuria and microscopic hematuria
Pyelonephritis
one or both kidneys involved
from ureter into kidney
purulent exudate fills pelvis and calyces and the medulla is inflammed
abscesses and necrosis can be seen in the medulla and may extend to the cortex to the surface of the capsule
if exudate is severe, it can compress the renal artery and vein and obstruct urine flow to the ureter
Recurrent or chronic infection can lead to scar tissue formation over the calyx
- loss of tubule fuction
- obstruction on aollection of filtrate
- eventual chronic renal failure if untreated
Signs or Pyelonephritis
All signs of cystitis plus pain associated with renal disease
- dull aching pain in lower back or flank area
Systemic signs include high temp
Urinalysis
- similar to cystitis
-urinary casts are present* important **
Glomerulonephritis
many forms
presence of antistreptococcal (ASO) antibodies
- formation of antigen-antibody complex
- activates complement system - hypersensitivity type III
- inflammatory response to glomeruli
–> increased capillary permeability - leakage of some protein and large numbers of erythrocytes
Severe inflammatory response
- congestion and cell proliferation
–> decreased GFR - rentention of fluid and wastes
Glomerulonephritis S&S
Urine is dark and cloudy Facial and periorbital edema - initially - general edema follows elevated blood pressure - caused by renin secretion and decreased GFR Flank or back pain - edema and stretching of renal capsule General signs of inflammation Decreased urine output
Glomerulonephritis Tests
Blood tests : elevated serum urea and creatinine, elevated anti-DNase B, streptococcal antibodies, antistreptolysin, antistreptokinase, complement levels decreased
Metabolic acidosis
Urinalysis: Proteinuria, hematuria, erthrocyte casts, no evidence of infection
Glomerulonephritis treatment
restrict sodium
protein and fluid intake decreased in severe cases
drug treatment: glucocorticoids to reduce inflammation, antihypertensives
Nephrotic Syndrome
Abnormality in glomerular capillaries, increased permeability, large amounts of plasma proteins escape into filtrate
May be idipathic in children 2-6
May be 2Nd to SLE, exposure to nephrotoxins or drugs
Nephrotic Syndrome Patho
- Abnormality in the glomerular capillaries and increase in GFR
- large amts of plasma protein (albumin) escape into filtrated - Hypoalbuminemia with decreased plasma osmotic pressure
- subsequent generalized edema - Blood pressure remains low or normal
- may be elevated depending on angiotensin II levels - Increased aldosterone secretion in response to reduced blood volume
- more severe edema - High blood cholesterol, lipoprotein in urine, lipiduria with milky appearance to the urine (cause not very clear may be related to liver response to heavy protein loss)
Nephrotic Syndrome S & S
Proteinuria, lipiduria, cast
Massive edema
Sudden increase in girth
Nephrotic Syndrome Treatment
Glucocorticoids: inflammation
ACE inhibitors: may decrease protein loss in urine
Antihypertensives
Sodium intake may be restricted
Nephrosclerosis
vascular disorder
Involves vascular changes in the kidneys - some normal with age
Thickening and hardening of the walls of arterioles and small arteries
Narrowing of the blood vessel lumen
- reduction of blood supply to kidney
- stimulates renin to increase BP
There is continued ischemia because of hardening
- destruction of renal tissue and chronic renal failure
Nephrosclerosis Treatment
Antihypertensives
Diuretics
Beta Blockers
Sodium intake should be reduced
Polycystic Kidney disease
Autosomal dominant gene on Chromosome 16
No indications in child and young adults - develop around 40
Mulitple cysts develop in both kidneys
- enlargement of kidneys
- compression and destruction of kidney tissue
-chronic renal failure
Diagnosis by CT or MRI
Wilms Tumor
Most common tumor in children
Defects in tumor suppressor genes on chromosome 11
Usually unilateral - large encapsulated mass
Pulmonary metastases may be present at diagnosis
Acute Kidney Failure
happens abruptly
Kidneys fail to function
Can recover
AKI - Pre renal
Due to impaired blood flow
Something happens before the kidney
Example: hemorrhage, shock, heart failure
AKI - Intra renal
Something happens to the kidney
glomerulonephritis, medications, toxins
AKI - Post renal
something happens after the kidney
obstruction of urinary outflow (kidney stones, tumor, clots)
blocks urine flow beyond the kidneys