Nephro: Clinical Syndromes in Nephrology Flashcards
how do you analyse urine
urine dipstick
what is haematuria?
> 2 red cells/hpf in unspun urine
classification of haematuria
- microscopic/macroscopic
- persistent/transient
- glomerular/non-glomerular
- kidney/urinary tract
causes of glomerular haematuria
IgA nephropathy, thin basement membrane disease, Alport’s disease, other glomerulonephritis
causes of nonglomerular haematuria
tumours, cysts, calculi, pyelonephritis, papillary necrosis, renal vein thrombosis
causes of urinary tract bleeding
cystitis, prostate, tumours, stricture, schistosoma haematobium
most frequent causes of haematuria
- inflammation/infection of the urinary tract or prostate
- urinary calculi
- malignant neoplasms
- glomerular disorders
risk factors for malignancy
- people older than 40yo
- smoking
- pelvic irradiation
- cyclophosphamide treatment
- analgesic abuse
- occupational exposures
- history of gross haematuria
when are glomerular disorders more likely?
- proteinuria >0.5g/24hrs
- dysmorphic erythrocytes present and RBCs cast on phase contrast microscopy
- HTN
- renal impairment
what do pyuria or dysuria entail?
UTI
what do RTIs entail?
postinfectious glomerulonephritis, IgA nephropathy
why is family history important?
polycystic kidney disease, hereditary nephritides
what does back pain entail?
urethral obstruction
why is exercise or injury important in a nephro history
could rule out haematuria caused post-exercise or post-traumatic
what do micturition disorders in older men entail
prostatic obstruction
what does a history of bleeding from multiple sources?
coagulation disorders
investigations for haematuria
- urinalysis
- urine microscopy
- urine culture
- CBC
- U&E
- clotting screen
- PSA
- nephritic screen
- imaging (CT mainly)
- cystoscopy
- urine cytology
- renal biopsy (glomerular haematuria)
why is proteinuria important?
- marker for intrinsic renal disease
- prognostic factor for progession of renal insufficiency
- risk factor for CV mortality
- treatment target in CKD
normal value for proteinuria
<150mg/day
value for microalbuminuria
30-300mg/day
ACR >2.0mg/mmol
classification for pathophysiology of proteinuria
- glomerular
- tubular
- overflow (light chains in multiple myeloma)
- secretory (bladder tumour, prostatitis, blood)
classification of proteinuria (using values)
- mild <1g/day
- significant 1-3.5g/day
nephrotic >3.5g/day
the higher the value, the more likely is to be caused by glomerular disease
what causes leucocyturia
infection (neutrophilia)
tubular intersititial necrosis
causes of sterile pyuria
treated UTI, chlamydia, calculi, prostatitis, bladder tumour, papillary necrosis, TIN, TB
which mix of values has the worst prognosis (of protein and blood in urine)
nephrotic proteinuria and haematuria
criteria for nephrotic syndrome
proteinuria of >3.5g/1.73m2/24h hypoalbuminaemia oedema hyperlipidaemia lipiduria hypercoagulability
pathophysiology of nephrotic syndrome
primary insult = increased glomerular permeability; causing plasma protein leakage into urine
hypoalbuminaemia is the cause of the main clinical features
causes of nephrotic syndrome
- membranous glomerulopathy
- focal segmental glomerulosclerosis
- minimal change glomerulopathy
- miscellaneous proliferative GN
- membranoproliferative GN
- diabetes
- amyloidosis
- other disease
treatment of nephrotic syndrome
- salt and water restriction
- diuretic therapy
- hypertension treat
- anti-proteinuric drugs
- immunosuppressive therapy
definition of nephritic syndrome
glomerular inflammation causing:
- decrease in GFR
- moderate proteinuria
- oedema
- hypertension
- haematuria (red cell casts)