Urology Core Conditions Flashcards
What are the 3 groups of causes of AKI?
Pre-renal
Intrinsic
Post-renal
What are the pre-renal causes of AKI?
HypoV/haemorrhage Sepsis Overdiuresis ACEi Third spacing of fluids (pancreatitis) Cardiac failure
What are the intrinsic causes of AKI?
Rapidly progressive glomerulonephritis Acute interstitial nephritis Vasculitis (HUS) Nephrotoxins ACUTE TUBULAR NECROSIS (hypo perfusion)
What are the post-renal cause of AKI?
Ascending UTI
Renal/bladder calculi
Retroperitoneal fibrosis & strictures
Hyperplasia & cancer (lymphoma)
How is AKI investigated?
Urinalysis Bloods: FBC, U&E, LFTs, Ca, Phosphate, bicarb, U:C, kidney injury molecule CXR Renal USS ECG
In AKI how long does it take for creatinine to raise?
48-72hours
Cell damage irreversible by this time
What is the management for pre-renal AKI?
Treat cause Restore volumes: Bloods, fluids (Saline) Vasopressors: Dopamine/ Epinephrine Vol overload: Diuretics- Furosemide Renal replacement
What is the management for intrinsic AKI?
Treat cause
Refer to nephrologist- acid-base status
Same as pre-renal treatment
What is the management for post-renal AKI?
Bladder catheterisation Relieve obstruction (stenting, lithotripsy, nephrostomy)
What medications should be stopped in AKI?
Statins (Rhabdomyolysis) ACEi NSAIDs Contrast Gentamicin
What mnemonic can be used for investigations required in a potential AKI?
ROUND UP 26 R- Regular U&Es & creatinine O- Obstruction excluded U- Urinalysis N- Nephrotoxic drugs stopped D- Dry (0.9% NaCl) wet (Furosemide) U- Monitor urine output (<0.5ml/kg/hr for 6hours) P- Prescription review 26- Rise in creatinine within 48hours needed for AKI diagnosis
In the blood results, what differentiates an AKI from CKD?
CKD= anaemia, hyperphosphataemia, hyperkalaemia
What are the most common causes of UTI?
E. Coli type 1 & 2 Staph Saprophyticus (honeymoon cystitis) Enterobacter (Proteus, Klebsiella) Group B Strep Psuedomonas
What is the treatment for a UTI?
Abx: Nitrofurantoin 3-5days
Resistance: Ciprofloxacin
What are the causes of urinary retention?
Ureteral stones BPH Surgery Tumour Drugs (Anticholinergics, Opioids, Benzos, NSAIDs, OH-) Congenital abnormalities
How is urinary retention managed?
Immediate decompression by catheterisation
Alpha blocker before catheter
TWOC follow-up
Post op retention: Cholinergics, intravesicle prostaglandin
Calculi: Hydration, 30mg IM Ketorolac, stent/nephrostomy
Abx: Gentamicin 3-5mg/kg IV every 8hours
What is testicular torsion?
EMERGENCY
Twisting of the testicle on the spermatic cord leading to constriction of the vascular supply & time-sensitive ischaemia/necrosis
What are the causes of testicular torsion?
Trauma
Anatomical: Bell clapper deformity
What are the signs & symptoms of testicular torsion?
Intermittent, acute pain Pain NOT relieved upon elevation Scrotal swelling/oedema Scrotal erythema Reactive hydrocele High-riding testicle Horizontal line Absent cremasteric reflex
How is testicular torsion investigated?
Greyscale USS: Fluid & whirlpool sign
Power doppler USS or Colour doppler USS: Absent/dec blood flow in affected testicle
How is testicular torsion managed?
Neonate: Stabiliazation, urological consultation for emergency scrotal exploration
Non-neonate: Supportive care, scrotal exploration, manual de-torsion
What is the prognosis for testicular torsion?
4-6hours: Testes most likely viable
10-12hours: Ischaemia & irreversible testicular damage likely
>12hours: Necrosis likely
Who is most likely affected by testicular torsion?
Neonates
Adolescents
What is contained in the spermatic cord?
Vas Deferens Lymphatics Testicular artery Cremasteric artery Panpiniform plexus (veins) Testicular nerves Nerve to cremaster
How is urinary retention investigated?
MSU later Bloods: U&Es Cystography IV urography Cystoscopy Urodynamics
What is the diagnostic criteria for an AKI?
One of the following criteria met:
- Serum creatinine >26 over 48hours
- Serum creatinine rises >x1.5 from baseline measurement taken that week
- Urine output <0.5l/kg/hr for >6 consecutive hours
What are the risk factors for developing an AKI?
>75 Hx of CKD, peripheral vascular disease, CF, Liver disease, HTN, DM Hypovolaemia Sepsis Taking nephrotoxic drugs
What can an untreated AKI lead to?
HyperK
Uraemia
Fluid overload
Acidosis