Kidney & Urinary Tract Flashcards
What are the common causative organisms of a UTI?
- E. coli (90%)
- Proteus (males)
- Pseudomonas
- Klebsiella
What are the RFs of UTI?
- Incomplete bladder emptying > infrequent voiding, hurried micturition, obstruction due to constipation, neuropathic bladder
- Vesicoureteric reflux > developmental abnormality
- Poor hygiene
What are the S/S of a UTI?
Infants
- Poor feeding
- Vomiting
- Irritability
Young children
- Abdominal pain
- Fever
- Dysuria
Older children
- Dysuria
- Frequency
- Haematuria
What is the difference between an upper and lower UTI?
Upper / pyelonephritis
- Bacteriuria + fever >38
- Bacteriuria + loin pain/tenderness
Lower / cystitis
- Dysuria but no systemic sx
What are the features of an atypical UTI?
- Seriously ill / septicaemia
- Poor urine flow
- Abdominal or bladder mass
- Raised creatinine
- Failure to respond to treatment with suitable antibiotics within 48 hours
- Infection with non-E. coli organisms.
What is the preferred urine collection method?
- Clean catch preferrable
- If not possible, urine collection pads
- If not possible, invasive methods e.g. suprapubic aspiration
What are the investigations for a UTI?
Examination and obs:
- Including for signs of dehydration
- Check ENT
Bloods:
- FBC, U&Es, ?culture
Urine analysis:
- Urine dip > Nitrite stick test (very specific), Leucocyte esterase test (+ve in children with febrile illness without UTI and in balanitis and vulvovaginitis)
- Urine MC&S (diagnostic)
Acute USS: > to identify structural abnormalities
- If atypical or recurrent UTI
DMSA: > to identify renal scarring
Within 4-6m of acute infection
- If <3yrs with atypical or recurrent UTI
- If >3yrs with recurrent UTI
MCUG: > looks for causes of recurrent UTI
- If atypical / recurrent UTI
- If USS abnormality is detected
What is the management of a UTI?
<3m:
- Immediate referral to paeds + admission
- IV abx e.g. co-amoxiclav
- Then switched to oral prophylaxis
>3m + upper UTI:
- Consider admission and IV abx
- Or oral abx (e.g. cephalosporin or co-amox)
>3m + lower UTI:
- Oral abx (usually trimeth, nitrofurantoin, cephalosporin or amox)
- Safety net > bring child back if remain unwell after 24-48hrs
Recurrent UTI:
- Long-term low-dose abx prophylaxis
- Anti-VUR surgery
Conservative:
- High fluid intake
- Ensure complete bladder emptying
- Good perianal hygiene
- Regular voiding
- Tx/prevention of constipation
What is enuresis?
The involuntary passage of urine during sleep after the age when continence is anticipated
When should children have achieved continence?
Dry by day = 4yrs
Dry by night = 5yrs (most by 3-4yrs)
What are the types of enuresis?
Primary = Never achieved continence
Secondary = Child has been dry for >6m before
What are the causes of enuresis?
- Developmental: immature bladder control, disorder affecting arousal from sleep
- Environmental: stress, family break-up, maternal separation, moving, birth of younger sibling, hospital attendance
- Abuse: sexual, physical, emotional
- Structural: decreased bladder capacity, congenital anomalies
- Medical: UTI, constipation, epilepsy, occult spina bifida, diabetes, hyperthyroidism, neurogenic bladder
What are the S/S of enuresis?
- Frequency, nocturia, urgency, daytime incontinence, changing of clothes, thirst, polyuria
- Abuse and family stresses
- Hard stool in abdomen
What are the investigations for enuresis?
- Urine MC&S
- Bladder USS (pre-voiding capacity, wall thickness, residual volume)
What is the management of enuresis?
1. Treat any causes
2. General advice:
- Reassurance
- Bladder training/regular daytime voiding plans
- Positive reward system
3. Enuresis alarm:
- First-line for children
- Have sensor pads that sense wetness
- High success rate
4. Desmopressin:
- If short-term control is needed
- If an enuresis alarm has been ineffective
What is phimosis?
Unretractile foreskin
(secondary to either a physiological or pathological process)
What are the causes of phimosis?
Physiological:
- By 1yrs > 50% have non-retractable foreskin
- By 4yrs > 10%
- By 17yrs > 1%
- If persistent to puberty > increased risk of infection and problems with urination / intercourse
Pathological:
- Secondary to balanitis xerotica obliterans (BXO)
What are the S/S of phimosis?
> > Forceful retraction should not be attempted (often the child will self-retract)
Physiological:
- Hx of spraying / ballooning of urine
- Distal erythema
- Should have a spout of mucosa as the foreskin is retracted
Pathological / Balanitis:
- White fibrotic ring at the distal foreskin
- Absence of normal mucosal spout
- Oedema, erythema, tenderness
- Generation of purulent material from the distal phimotic foreskin
- Haematuria
- Painful erections
- Recurrent UTI
- Weak stream
What is the management of phimosis?
<2yrs:
- Reassurance
- Personal hygiene promotion
- RV in 6m
>2yrs:
- Circumcision or topical steroid creams (depends on severity)
Balanitis:
- Gentle saline washes, ensuring to properly wash under the foreskin
- 1% hydrocortisone used for a short period in severe cases
What is paraphimosis?
UROLOGICAL EMERGENCY
- Foreskin becomes trapped in retracted position proximal to swollen glans
- Restricts blood flow to head of penis > penis turns dark purple
What is the management of paraphimosis?
1. Manipulation with topical analgesia (with ice packs, compression, osmotic agents)
2. Puncture technique - perforating the foreskin at multiple locations to allow exudation of oedematous fluid (if manipulation was unsuccessful)
3. Surgical reduction followed by circumcision
What is hypospadias?
Congenital abnormality of the penis
Wrongly positioned meatus (opening of the urethra is on underside of the penis instead of at the tip)
What are the S/S of hypospadias?
- Ventral foramen
- Foreskin not fused ventrally
- End-membrane
- Hooded foreskin
- Chordee (downward curve of the penis)
- Abnormal spraying during urination
What is the management of hypospadias?
- Surgery NOT mandatory
- May be performed on functional or cosmetic grounds (after 3 months)
- Ultimate functional aim of surgery is to allow boys to pass urine in a straight line whilst standing and to have a straight erection
IMPORTANT: boys with hypospadias should NOT be circumcised before repair, because the skin is important for the repair
What conditions are associated with hypospadias?
cryptorchidism and inguinal hernias
What is balanoposthitis?
Inflamed / purulent discharge from foreskin
(Single attacks common)
What is the management of balanoposthitis?
- Clean penis daily with lukewarm water and dry gently
- Advise on sources of written information and support
- Consider topical hydrocortisone
- Candidal = imidazole cream
- Bacterial = fluclox
- If recurrent (rare) > circumcision
What is testicular torsion?
Twist of the spermatic cord resulting in testicular ischaemia and necrosis
MUST be excluded in any boy with acute abdomen
When does testicular torsion occur?
Most common 10-30yrs (peak 13-15)
What are the S/S of testicular torsion?
- Severe, sudden onset pain in testes > can be referred to lower abdomen
- Nausea / vomiting
O/E
- Swollen, tender testes retracted upwards
- Skin may be reddened
- Cremasteric reflex lost
- Elevation of testes does NOT ease pain (Prehn’s sign)
What are the investigations for testicular torsion?
Doppler USS
(cannot delay surgery)
What is the management for testicular torsion?
EMERGENCY > urgent urological referral
- Exploration surgery +/- bilateral orchiopexy +/- fixation of contralateral testes
- Supportive care > analgesia, sedation, antiemetics
What is nephrotic syndrome?
Triad of:
- Proteinuria
- Hypoalbuminaemia
- Oedema
- +High cholesterol and triglycerides
(protein-losing nephropathy > kidney losing protein in urine)
What are the causes of nephrotic syndrome?
- Minimal Change Disease (MCD) > most common cause
- Focal segmental glomerulosclerosis (FSGS)
- Membranous nephropathy (MN)
Also - diabetes, lupus, amyloidosis, drugs, infections (HIV, HBV, HCV, malaria)
Describe MCD
- Patient is young (2-4yrs)
- Disease is mild (selective proteinuria)
- Prognosis is excellent (great response to steroids)
- Normal renal function / BP
- Glomeruli look normal on light microscopy, but electron microscopy shows loss of foot processes