Renal Flashcards
Who does UTI affect?
Young, sexually active women
Menopausal women
What causes UTI?
E. Coli
- main organism
- 75-95% in community; >41% in hospital
Enterobacteriaceae
Classification:
- uncomplicated = normal renal tract + function
- complicated = abnormal tract, voiding difficulty/obstruction, ⬇️renal function, ⬇️immunity, virulent organism (staph aureus)
Sterile pyuria ➡️ no organisms
What are the risk factors for UTI?
Sexual intercourse Gender (F>M) Exposure to spermicide Pregnancy Menopause Immunosuppression DM Urinary tract ➡️ obstruction, stones, malformation Catheter ➡️ urine always infected, only treat if ill Antibiotics (changes vaginal flora)
What are the symptoms of a Lower UTI?
Cystitis ➡️
Frequency, dysuria, urgency, haematuria, suprapubic pain
Prostatitis ➡️
Flu- like symptoms, low backache, few urinary symptoms, swollen/tender prostate
What are the symptoms of an Upper UTI?
Acute pyelonephritis ➡️
High fever, rigours, vomiting, loin pain/tenderness, oliguria (AKI)
What are the signs of a UTI on examination?
Fever Abdomen/loin tenderness Foul smelling urine Distended bladder Enlarged prostate
What are the differential diagnoses of a UTI?
Women:
Urethral syndrome (no bacterial infection)
Postmenopause with atrophic vaginitis and urethritis
Genital tract infection eg thrush, herpes simplex, chlamydia, gardnerella
Men:
Enlarged/inflamed prostate
What are the necessary investigations to diagnose a UTI?
Urine dipstick ➡️ looking for nitrites, leukocytes and blood
Mid-stream Urine ➡️ if dipstick positive, symptomatic, male, pregnant, child, immunosuppressed
- pure growth of 1 000 000 organism/mL = diagnosis
Bloods ➡️ FBC, U&Es, CRP, cultures (check for sepsis), PSA, fasting glucose
Imaging ➡️ ultrasound, bladder scan
What are the treatments for a UTI?
Cranberry juice
Fluids
Frequent urination
Pharmacological: LUTI: Trimethoprim ➡️ 200mg/12h Nitrofurantoin ➡️ 50mg/6h - uncomplicated female 3-6 days - male/complicated female 7 days Amoxicillin ➡️ 500mg/8h Alternatives = Cefalexin (if eGFR>40) Co-amoxiclav (7d)
UUTI:
Co-amoxiclav ➡️ 1.2g/8h IV, oral switch when afebrile
Men ➡️ may need 2/52 quinolone eg levofloxacin
How common is pyelonephritis?
Prevalence: 4 in 100,000 asymptomatic adults
Who is pyelonephritis most likely to present in?
Most common in young women
>65 men and women equal
What is pyelonephritis?
Pyelonephritis is an upper UTI that causes inflammation of the renal pelvis
caused by infections.
What are the causative organisms of infective pyelonephritis?
- E. coli, klebsiella spp, proteus spp, enterococcus spp
Rare) mycobacteria, fungi, yeasts and corynebacterium urealyticum (rare
What are the acute risk factors for pyelonephritis?
Catheter Calculi Structural abnormality Renal tract ablation Stents/drainage procedures Pregnancy DM Primary biliary cirrhosis Immunocompromised Neuropathic bladder
What are the chronic risk factors for pyelonephritis?
Renal tract abnormalities/obstruction/calculi
Children➡️ vesicourethral reflux
Neonates➡️ intrarenal reflux
Recurrent UTI
What are the symptoms of pyelonephritis?
Acute: rapid onset:
- Loin to groin/suprapubic pain
- Fever and rigors
- Malaise
- Nausea/vomiting/Anorexia/Diarrhoea
- UTI symptoms (frequency, dysuria, haematuria, hesitancy), Gross haematuria (30% young women)
Chronic:
- Fever
- Malaise
- Loin pain
- Nausea/vomiting
- Dysuria
- failure to thrive in children
What are the signs of pyelonephritis on examination?
- patient looks ill
- pain on palpation of 1/2 kidneys
- moderate suprapubic tenderness without guarding
What are the possible differential diagnoses of pyelonephritis?
- interstitial cystitis
- PID
- appendicitis
- ectopic pregnancy
- urethritis
- STIs
What investigations are necessary to diagnose pyelonephritis?
Urinalysis:
- dipstick = protein, leukocytes, nitrites, blood
MSU microscopy:
- pyuria
Bloods:
CRP ESR, plasma viscosity
FBC ➡️ elevated WCC with neutrophilia
Cultures
Imaging: (uncertain clinical picture)
Contrast-enhanced CT
Ultrasound
MRI for scarring
Renal biopsy (suspected cancer)
Management of acute pyelonephritis?
Acute:
Support, rest analgesia, fluids
Antibiotics: (empiric)
Ciprofloxacin 250-500mg BD (7-10days)
Surgery to drain abscess/relieve obstruction causing infection
How common is hydronephrosis?
Unilateral - 1/300 people in UK per year
Bilateral -1/600 people in UK per year
Who does hydronephrosis affect?
Men and women at any age
Congenital causes common
What is hydronephrosis?
Condition where one or both kidneys become stretched or swollen as a result of a build-up of urine inside the kidneys
What causes hydronephrosis?
Ureter obstruction:
- tumour, blood clot, calculi, sloughed papillae
- stricture, congenital megaureter, bladder neck obstruction, neurogenic bladder, bladder carcinoma
- outside lumen: pelvic-ureteric junction compression e.g. tumours & prostatic hyperplasia, retroperitoneal fibrosis
What are the risk factors of hydronephrosis?
- Pregnancy
- Cancer of cervix, prostate, ovaries
- Previous calculi/obstruction
What are the symptoms of hydronephrosis?
Acute:
- Quick onset (~3hrs)
- Severe, colicky pain in back/flank (worse when drinking fluid)
- palpable mass
- Nausea/vomiting
- Systemic symptoms ➡️ Fever/rigors
- Haematuria
Chronic:
- Same as acute
- Asymptomatic
- Dull ache in flank
- Decreased frequency of urination
What are the signs of hydronephrosis on examination?
Enlarged kidney-tender on palpation
Septicaemia signs
Anuria = bilateral complete obstruction
Distended bladder
What are the possible differential diagnoses of hydronephrosis?
- Renal cyst
- Renal mass
- AKI
- Polycystic kidney disease
What investigations are necessary to diagnose hydronephrosis?
- Ultrasound ➡️ swollen, fluid filled kidney
- AXR - radiolucent stones
- Cytoscopy
- Bloods ➡️ U&Es (Na+/K+⬇️ after chronic obstruction), check urate, phosphate, calcium wtc if stones suspected
- eGFR
- PR looking for enlarged prostate, in enlarged maybe PSA
- Blood cultures
- Urinalysis**
How would you treat hydronephrosis?
- fluid balance
- Analgesics
- Blockage removal ➡️ urethral/suprapubic catheter
Stenting of ureter - Nephrostomy (incision in kidney- emergency)
- Lithotripsy ➡️ using shockwaves to break up stones
*Most stones pass spontaneously
How common is AKI?
- 18% of hospital pts
- 1% in community
Who does AKI affect?
- Most common in elderly
- ICU
- CKD
What is acute kidney injury (AKI)?
- creatinine rise >26 umol/L OR - creatinine 1.5 x baseline OR - urine output 6 consecutive hrs
What are the causes of AKI? (Pre renal, renal, post renal)
Pre- renal:
- 40-70% of renal hypoperfusion (hypotension/sepsis/hypovolaemia)
- renal artery stenosis
- ACE inhibitors
Renal/Intrinsic:
- tubular necrosis due to nephrotoxins, pre-renal damage, radiological contrast, crystal damage (Uris acid), myeloma, ⬆️Ca
- glomerular- autoimmune (SLE), drugs, infection
- interstitial - drugs
- vascular- vasculitis, malignant hypertension, thrombus, cholesterol emboli
Post renal:
- 10-25% UT obstruction (stones, clots, sloughed papillae, malignancy, BPH, strictures, retroperitoneal fibrosis)
What are the risk factors for AKI?
>75 years CKD Heart failure Peripheral vascular disease Chronic liver disease Diabetes mellitus Drugs Sepsis ⬇️intake/⬆️loss
What are the symptoms of AKI?
Dysuria/oliguria
Nausea/vomiting
Dehydration
Confusion
What are the signs of AKI on examination?
⬆️creatinine >26umol/L in 48h
⬆️ creatinine >1.5xbaseline (best figure in 3/12)
Urine output 6h
Palpable bladder
Palpable kidneys (polycystic kidney disease)
Abdomen/pelvic mass
Renal bruits
Rashes (signs of vasculitis)
Hypertension
Fluid overload (raised JVP, pulmonary oedema, peripheral oedema)
Pericardial Rub
Crispy-clearly dehydrated, poor skin turgor
What are the possible differential diagnoses of AKI?
CKD