kidney stones, bladder ca, RCC Flashcards
types of kidney stones
- calcium stone- most common
- struvite stones- aka staghorn calculi
- uric acid stones
- cystine stones- often recurrent
risk factors for calcium stones
- hx of prior stones
- family hx
- diet
- medications
- hyperparathyroidism
- hypercalcemia of malignancy
- sarcoidosis
- medullary sponge kidney
dietary risk factors for calcium stones
- dehydration*
- short gut -> increased enteric absorption of oxalate
- large consumption of grapefruit juice, tomato juice, apple juice, soda
- high Na or protein intake
medications at risk for causing calcium stones
- diuretics- esp thiazides
- antacids in high volumes
- vit D and C
risk factors for uric acid stones
- gout
- hyperuricosuria
- chronic diarrhea
- HTN, DM, obesity*
other drugs that may cause stones
- indinavir
- acyclovir
- triamterene
- sulfadiazine
clinical presentation of kidney stones
- sudden onset renal colic
- severe unilateral flank pain, may radiate to groin
- pacing, rocking, writing, constant movement
- n/v, diaphroesis
- tachycardia, HTN
- normal abd exam
- testicles non-tender and non-swollen
- hematuria, dysuria, frequency, urgency
describe the colicky pain of kidney stones
- SUDDEN onset severe pain
- pain waxes and wanes
- severe pain usually lasts 20-60 min
where do kidney stones usually get stuck?
- UPJ
- pelvic brim
- UVJ
pain from a stone stuck in the kidney
- flank pain
- hematuria
pain from a stone stuck in the proximal ureter
- renal colic and flank pain
- upper abd pain
pain from a stone stuck in middle ureter
- renal colic
- anterior abdominal/groin pain
pain from a stone stuck in distal ureter
- renal colic
- dysuria/ urgency/ frequency/ hesitancy
- anterior abd pain
- groin pain
what should you look for on UA for kidney stone work up
- microhematuria- common but not always present
- pH, crystals, bacteria
- signs of infection
- limited pyuria is common from irritation due to stone
US for kidney stone dx
- look for indirect signs of obstruction
- hydroureter, no ureteric jet
- procedure of choice in pregnancy, kids, hx of prev stone
KUB for kidney stone dx
- stone frequently gets obscured by stool, bowel gas, bones
- does not show all stone types
- cant see uric acid stones, pure cystine stones, indinavir stones
IV pyelograms for kidney stone dx
- poor visualization of non-GU structures
- need good kidney function- get SCr prior to test
non-contrast CT scan for kidney stone dx
- gold std
- IDs all stone types in all locations
- fast and accurate
- c/i in kids and pregnancy
- can also see ureteral/ collecting dilation, perinephric/ periureteric stranding, nephromegaly, rim sign
what is the rim sign
- ureter swollen around kidney stone
management for kidney stones
- IV hydration
- NSAIDs (ketorolac)
- +/- antiemetics- usu emesis due to pain
- +/- tamulosin
- d/c to home if able to take PO meds and fluids
- strain urine
- send stone for analysis
when is hospitalization required for kidney stones
- cannot take PO due to intractable vomiting
- refractory/ severe pain
- pregnant
- elderly/ comorbidities
what are emergent situations in the setting of kidney stones
- sepsis + obstruction
- ARF
- anuria
what are the procedures used for kidney stones
- extracorporeal shock wave lithotripsy (ESWL)
- ureteroscopy
- percutaneous nephrolithostomy (PCNL)