Part 31 Flashcards
Presence of an initial kidney stone attack after age ___ is very rare
50
Up to 1 in ___ people will be affected by a kidney stone in their lifetime
11
All kidney stones are more common in men except for ____
struvite stones
Risk factors for nephrolithiasis (6)
- DM
- PKD
- dehydration
- cystinuria
- hyperparathyroidism
- drugs
Recurrence rate for a kidney stone is __%
52
4 types of kidney stones and a unique fact about each
1) calcium oxolate (most common)
2) struvite (more common in women and causes staghorn calculi)
3) uric acid (seen in gout)
4) cystine (related to cystinuria, autosomal recessive disease)
Staghorn calculi definition
Upper urinary tract stones that involve the renal pelvis and extend into at least 2 calyces, most often struvite type and seen in females
What is the most common metabolic abnormality seen in formation of calcium oxylate kidney stones? How does low diet calcium cause increased stone formation?
Hypercalciuria
A lack of Ca2+ in diet to bind oxalate and neutralize it means that it is absorbed into the blood stream and urine increasing new stone formation
Clinical presentation of nephrolithiasis
Sudden onset of severe pain that starts in flank and moves inferior and anterior, often with associated nausea, vomiting, occasionally fever and chills if coexisting infections, and restlessness
Even large calculi can be ___ in patients until they are triggered to begin moving
asymptomatic
Pain from nephrolithiasis may suddenly stop for a period when…
….the stone reaches the bladder
Stranguria definition
Painful frequent urination of small volumes with associated urgency, urine expelled slow drop by drop with straining and patient is left with incomplete sense of emptying
Gold standard diagnostic choice for nephrolithiasis, what about children or pregnant patients?
Non contrast CT of abdomen and pelvis, in children or pregnant patients recommended to use renal ultrasound
supportive care for nephrolithiasis (2)
- IV hydration
- pain relief (acetaminophen)
Expulsive therapy for nephrolithiasis (1)
-alpha blockers
Indications for interventional therapy for nephrolithiasis (5)
- solitary kidney
- failure to respond to conservative management
- stones >10mm
- UTI or sepsis
- struvite stones
Ureteroscopy for management of nephrolithiasis
-Can visualize and and dilate ureter, sometimes by placing stent
Extracorporal shockwave lithotripsy definition
Use of shockwaves to break up the kidney stone and allow it to pass in smaller pieces
Percutaneous nephrolithotomy indications (2)
- in stones greater than 2 cm
- in staghorn calculi
Alkalining agents can help dissolve these 2 types of stones
- uric acid
- cystine
Primary age group to see kidney stones
35-45
Acute Kidney injury is characterized by its ___
fast onset (days to weeks)
Metabolic acidosis is brought on when the kidney is no longer doing what?
Excreting H+ ions and reabsorbing HCO3-
2 values that confirm AKI
- increase in creatinine level
- decrease in urine output
1 risk factor for developing AKI is having…
Chronic kidney disease
Mortality rate for severe AKI is up to ___%
60
If AKI requires dialysis, there is a ___ risk of progression to CKD stage IV or V
Increased
When treating AKI, important to avoid ____agents such as NSAIDS, aminoglycosides, ACE inhibitors/ARB’s, and cyclosporines
Nephrotoxic
1 cause of prerenal AKI
Decreased renal perfusion
1 cause of post renal AKI
Obstruction
Prognosis of prerenal AKI
Good, typically does not cause permanent damage if treated
Most common acute tubular necroses are in ____ patients
Hospitalized
Acute Interstitial nephritis treatment (1)
-Corticosteroids
Some common causes of Intrinsic AKI (4)
- glomerulonephritis
- acute tubular necrosis
- acute interstitial nephritis
- renal artery stenosis
Common physical exam findings of AKI (5)
- edema
- confusion
- asterixis
- coke colored urine
- cva tenderness
In assessing AKI you want to determine if it is prerenal or intrinsic renal, how can you do this?
FENa test <1% indicates prerenal cause and >2% indicates intrinsic renal cause
Any patient having kidney issues needs to be on a ___ and ____restricted diet
protein, sodium
Protective IV therapy against hyperkalemia for heart arrhythmia
Calcium gluconate
Treatment for hyperkalemia to increase cellular uptake of potassium is…
….insulin with glucosee IV
IV sodium bicarbonate can be used to treat….
….metabolic acidosis
Indications that AKI warrants dialysis (3)
- metabolic acidosis
- hyperkalemia
- signs of uremia such as asterixis and mental decline
1 cause of acute tubular necrosis is….
…renal hypoperfusion
3 big hormones of the kidney
- calcitriol
- erythropoietin
- renin
Chronic renal failure definition
Process of significant irreversible reduction in number of functioning nephrons characterized by at least 3 months of reduced GFR
2 most common causes of chronic renal failure
- hypertension
- uncontrolled diabetes
2 elements needed to diagnose chronic renal failure
- Albuminuria
- GFR
Chronic kidney failure in stage G1-G3B are usually ____
asymptomatic
Chronic renal failure involves every organ system, including 2 endocrine ones…
…osteoperososis due to calcitriol lack and anemia due to erythropoietin
Uremic scratching is a finding seen in ___ and define it
Chronic kidney failure, hyper phosphatemia causing itching and scratching on excoriated skin
Treatment for chronic kidney failure includes these 4 classes of meds
- ACE or ARB’s
- diuretics
- Ereythropoietin stimulating agent
- iron supplements
Nongenetic causes of renal cyst formation (1)
-Acquired with end stage renal disease after several years of dialysis typically
Genetic causes of renal cyst formation (5)
- Autosomal dominant PKD
- Medullary sponge kidney
- autosomal recessive PKD
- Nephronophithisis
- Medullary cystic kidney disease
Mechanism of polycystic kidney disease
-malformation of proteins important to the structure of the primary cilium (polycystin 1 and 2)
3 criteria for a simple kidney cyst to be evaluated on ultrasonography that if present allow it to be differentiated from a carcinoma or abscess
- mass is round and sharply demarcated with smooth walls
- no echoes in mass
- good transmission of cyst and enhanced transmission byond the cyst (fluid filled)
Imaging study of choice for renal cyst if ultrasonography proves inconclusive and one good alternative
CT scan
MRI
Bosniak classification of renal cysts
1 - not malignant 2 - not malignant 2F 3 - 50/50 4 - always malignant
Most common renal masses that typically produce no signs or symptoms
Simple renal cysts
Risks associated with simple cysts (3)
- infection
- hypertension
- hemorrhage
A negative side effect in 50% of patients on dialysis for >3 years is development of…
PKD
Acquired PKD clinicla features (3)
- flank pain
- hematuria
- predispsoal to nephrolithiasis
Autosomal dominant PKD characteristics (4)
- most common
- ultimately fatal
- no specific therapy
- cysts often show up in other areas as well
Autosomal dominant PKD affected genes, what chromosomes do they occupy?
-PKD1 (faster progressoin) and 2 (less common and slower), 16 and 4 respectively
Those with audosomal dominant PKD most often die of what cause?
-cardiac diseases
Diagnosis of a renal cyst below the age of 18 is strongly suggestive of…
…Autosomal dominant PKD
Test of choice to detect autosomal dominant PKD
Ultrasound
Absence of cysts on ultrasound cannot exclude possibility of subsequent expression of ____phenotype
Autosomal dominant PKD
2 major goals of treatment of Autosomal dominant PKD
-control diabetes
- control hypertension
Autosomal dominant PKD prognosis
-Variable and hard to predict, about 50% reach age 73 without being at end stage renal failure
Autosomal recessive pkd presents at ____
infancy
Complications of infants with autosomal recessive PKD (3, which one kills?)
- portal hypertension
- pulmonary hypoplasia (death)
- hepatomegaly
___% of children with autosomal recessive pkd progress to end stage renal disease in the first decade of life
50
Autosomal recessive pkd treatment and prognsosi
- none, sometimes transplant
- 15 year survival rate about 67%