Hematuria (Mod 202) Flashcards
What are 6 common causes of hematuria?
- Infections (any age) 2. Nephrolithiasis (>20yo) 3. Neoplasms (>40yo except Wilms) 4. BPH (Males>40yo) 5. Glomerulonephritis (young children) 6. Schistosomiasis (any age; most common worldwide)
What are some causes of pigmenturia?
- Meds (azathioprine, doxorubicin, ibuprofen) 2. Metabolites (bilirubin, melanin, methemoglobin) 3. Food Dyes (blackberries, beets, food colouring)
Define Macroscopic Hematuria
- visible with the naked eye - Always pathologic - “tea coloured/ cola coloured” - Malignancy until proven otherwise
Define Microscopic Hematuria
- nonvisible to the naked eye - microscopy of 2 properly collected urine specimens show >2 RBCs per high powered field - no hx of recent exercise, menses, sexual activity, or instrumentation
What is transient microscopic hematuria
UTIs, strenuous exercise - Would likely resolve on testing 48hs after tx/ 72h post exercise
What is spurious microscopic hematuria?
contamination of urine sample from menstruation or sexual intercourse for women
What is persistent microscopic hematuria?
true hematuria
What are Sx of lower UTIs (urethritis/ cystitis)
Urethritis; Acute onset, dysuria Cystitis; Acute onset, dysuria, frequency, urgency, hematuria (micro or macro), suprapubic pain, ?nocturia, hesitancy
What are the Sx of Upper UTI (pyelonephritis)
- infection of renal parenchyma and renal pelvis/ calyces - symptoms of cystitis + fever/chills, flank pain/ CVA tenderness - systemic sx; N&V
What are features of asymptomatic bacteruria
- no specific sx - positive urine culture - no/insignificant # of WBCs in urine - common in elderly women - tx pregnant females/preschoolers
What is an uncomplicated UTI
UTI with no structural or functional abnormality within the urinary tract or kidney parenchyma & no comorbidities that would increase likelihood of complications; not associated with instrumentation
What are some RF for increased risk of tx failure in uncomplicated UTIs?
- hx of polycystic renal disease 2. nephrolithiasis 3. neurogenic bladder 4. DM 5. immunosuppression 6. pregnancy 7. indwelling catheter 8. recent instrumentation
What is a complicated UTI?
infection with anatomical/functional problems of the urinary tract, or the presence of comorbidities that increase risk for complications.
What are the RF for complicated UTIs
- Male sex 2. Anatomic abnormality of the urinary tract or external drainage system 3. Recurrent UTI 4. Advanced age in men 5. Nursing home residency 6. Neonatal state 7. Comorbidities 8. Pregnancy 9. Immunosuppression 10. Advanced neurologic disease 11. Known or suspected atypical pathogens 12. Known or suspected resistance to typical antimicrobial agents for UTI`
What does the development of UTI depend on?
- Ability of the microbe to establish itself and to cause disease-virulence factors. 2. ability of the host to resist the microbe (host factors)
What are 5 virulence factors?
- Adherence to epithelial cells via fimbriae and pili 2. Resistance to cidal compounds in serum 3. Production of hemolysins (membrane damaging toxins that target RBCs, WBCs etc) 4. Motility 5. Activitiy of endotoxins and other toxins
What are the 4 modes of entry into the urinary tract?
- Periurethral bacteria ascending into the urinary tract 2. Hematogenous spread esp in immunocompromised + neonates (staph aureus, candidia, mycobacterium TB) 3. Lymphatogenous spread 4. Spread of bacteria from adjacent organs
What are 7 elements of host defence in UTIs?
- Periurethral flora 2. Prostate (secretions contain zinc which act as antimicrobial) 3. Flow of urine 4. Urine osmolality, low pH, organic acid content and increased urea concentration (inhibit growth/colonization) 5. Urinary proteins (inhibit bacterial adherence) 6. Serum/ urine antibodies (bacterial opsonization/phagocytosis) 7. Urinary tract epithelium (barrier)
What causes 80% of uncomplicated cystitis and plyelonephritis?
E.coli
What are the pathogens that cause UTIs?
Community Acquired
Nosocomial Organisms
Immunocompromised/Speical
Diagnostic Flow Chart Below
What Ix do you do to Dx UTI?
- Dipstick ( urine specific gravity, pH, protein, blood, glucose, ketones, bilirubin, nitrite and leukocyte esterase)
- Urinalysis (microscopy) of mid stream sample
- Urine culture (gold standard) & sensitivity
- Children with first UTI may need renal US & voiding cystourethrogram (r/o anatomic defect)
What are you looking for in a urine dipstick with regards to UTI?
- Nitrites (reduction of urinary nitrites by Gram - bacteria)
- Note Gram + cocci do not convert nitrate to nitrite so negative nitrite does not r/o UTI - Leukocyte esterase (breakdown of WBCs)
What are you looking for on Renal U/S with relation to UTIs?
Size and shape of kidneys
anatomic abnormalities
difference between cyst & mass
bladder obstruction
ureteral obstruction
hydronephrosis
Kidney stones (not good for stone in ureter)
What is the Tx of acute uncomplicated UTI?
Acute uncomplicated; TMP/SMX or nitrofurantoin
What is the tx for pyelonephritis?
Fluorouinolone (pyelonephritis)
What is the tx for pregnant women with UTI
- Cephalexin, Ampicillin, Nitrofurantoin = 1st line
- Avoid Nitrofurantoin at 36+ weeks (hemolytic anemia of neonate)
- DO NOT USE TMP/SMX - Teratogenic in early pregnancy + kernicterus in late pregnancy
What is the uti tx for Men?
Fluoroquinolone or TMP-SMX for 7 - 14 days
How do you divide renal causes of hematuria?
- Glomerular
- Non Glomerular
What are the three glomerular (renal) causes of hematuria?
- IgA nephropathy
- Alport disease and thin basement membrane nephropathy (TBMN)
- Other primary & secondary glomerulonephropathies
- post infectious
- SLE
- Goodpasture Syndrome
- Henoch Schunlein purpura or vasculitides
- Hemolytic Uremic Syndrome
What are the 4 categories of non glomerular (renal) causes of hematuria?
- Neoplastic
- Tubulointersitial
- Vascular
- Metabolic
What are two neoplastic (non glomerular - renal) causes of hematuria?
- Rnal cell or transitional cell Ca
- Benign Renal Mass
What are 5 Tubulointerstitial (non glomerular renal) causes of Hematuria?
- Nephrolithiasis
- PCKD or medullary sponge kidney
- Pyelonephritis
- Papillary Necrosis
- Acute interstitial Nephritis
What are 5 vascular (non glomerular renal) causes of hematuria?
- aterial embolus/ thrombosis
- AV malformation or fistula
- Renal vein thrombosis
- Nutcracker syndrome (compression of Left renal vein)
- Malignant HTN
What two metabolic (non glomerular renal) causes of hematuria?
- Hypercalciuria
- Hyperuricosuria
What are four things that glomerular hematuria will show?
(do not see these abnormalities if origin is distal to kidney or because of structural abnormalities)
- Dysmorphic RBCs (changes because cells are squeezed through the capillary wall of the glomerulus & tubules of nephron.
- Red cell casts
- New/ worse HTN or proteinuria
- Increased creatinine
What are the classes of extra renal causes of hematuria (4)
- Ureter
- Bladder
- Urethra
- Prostate
What are three ureter causes of hematuria?
- stricture
- stone
- Mass; benign or malignant polyp
What are 4 bladder causes of hematuria?
- Infectious cystitis
- Noninfectious cystitis
- Transitional cell or squamous cell Ca
- Stone
What are 4 urethral causes of hematuria?
- Urethritis
- Urethral diverticulum
- Traumatic Catheterization
- Urethral Stricture
What are 4 prostate causes of hematuria?
- Prostate Cancer
- BPH
- Post procedural
- Prostatitis
What is an approach to macroscopic hematuria?
What is an approach to microscopic hematuria?
What is eGFR measuring, what is the normal range?
measuring renal function
normal = 100 - 120mL/min/1.73m2 of body surface area
What are 3 things that can interfere with secretion of creatinine?
- dietary protein intake
- volume of muscle mass
meds (cimetidine, trimethoprim, probenecid)
Will eldery, cachexic patients & spinal cord injury patients have more or less serum createnine?
lower serum creatinine –> less muscle mass
Define Proteinuria
- >150mg/day of protein excretion