Urological Presentations Flashcards
(125 cards)
What is nephrolithiasis?
formation of stones (calculi; composed of calcium oxalate/calcium phosphate/ uric acid/cysteine/struvite) present in the kidneys (nephrolithiasis) or ureters (ureterolithiasis) causing renal colic (colicky pain) due to dilation, stretching and spasm due to acute ureteral obstruction
Define the following terms:
- Nephrolithiasis
- Urolithiasis
- Nephrocalcinosis
- Nephrolithiasis = calculi within the kidney
- Urolithiasis = calculi within the urinary system
- Nephrocalcinosis = diffuse renal parenchymal calcification
State 5 aetiological factors of Urolithiasis/Nephrolithiasis,
Mnemonic -> HIDE
- Hyperparathyroidism
- Hypercalcemia
- Hypercalcuria
- Hypomagnesemia
- Hyperoxaluria
- Hypervitaminosis D
- Hyperuricemia/Hyperuricosuria
- Infection
- Inadequate urinary drainage (urine stasis)
- Immobilisation
- Diet (Vitamin A deficiency)
- Dehydration
- Decreased urine citrate
- Distal RTA
- Drugs: Loop diuretics; Thiazide diuretics; Indinavir
What 3 forms of urolithiasis are radiolucent?
Radiolucent stones -> Mnemonic = ICU
- Indinavir
- Cysteine
- Uric Acid
A 47 year old man presents with severe colicky pain in the flank radiating from the loin to groin. He is experiencing increased urinary urgency and has noticed a red tinge in his urine. O/E there is some abdominal distension.
He has no significant medical history other than hypertension.
His urinalysis shows leukocytosis whilst the FBC shows this also.
What would the gold-standard diagnostic test be?
CT-KUB
A 47 year old man presents with severe colicky pain in the flank radiating from the loin to groin. He is experiencing increased urinary urgency and has noticed a red tinge in his urine. O/E there is some abdominal distension.
He has no significant medical history other than hypertension.
His urinalysis shows leukocytosis whilst the FBC shows this also. A CT-KUB shows no radiological abnormalities but a region of dilatation and stenosis is observed.
What is your DDx?
What type of pathology can be responsible for this DDx?
How would you decide on your management plan?
Urolithiasis
Indinavir stone/Cysteine stone/ Uric Acid Stone –> All Radiolucent Stones
Size of stone
- Conservative management: Hydration/Pain control/Anti-emetics (metoclopramide)
- ABX: Nitrofurantoin 100mg PO BD 1-2/52
- Alpha-blocker: Tamsulosin 0.4mg OD
- ESWT
- Surgical removal: Percutaneous nephrolithotomy
Which of the following renal calculi is shaped like an envelope?
A. Cysteine
B. Calcium Oxalate
C. Uric Acid
D. Struvite
B. Calcium Oxalate
Which of the following renal calculi is shaped like a stag horn?
A. Cysteine
B. Calcium Oxalate
C. Uric Acid
D. Struvite
D. Struvite
Which of the following renal calculi is shaped like a hexagon?
A. Cysteine
B. Calcium Oxalate
C. Uric Acid
D. Struvite
A. Cysteine
Which of the following renal calculi is shaped like a rhomboid?
A. Cysteine
B. Calcium Oxalate
C. Uric Acid
D. Struvite
C. Uric Acid
Which of the following renal calculi is shaped like a wedge-shaped prism?
A. Calcium phosphate
B. Calcium Oxalate
C. Uric Acid
D. Struvite
A. Calcium phosphate
What is urinary obstruction?
Blockage of urinary flow, unilateral or bilateral, characterised by flank pain, fever, polyuria, weak stream, incomplete emptying, nocturia and/or bladder distension
Define the following terms
- Hydronephrosis
- Pyonephrosis
- Hydroureter
- Obstructive Nephropathy
- Hydronephrosis = backpressure of urine causing distension of kidney
- Pyonephrosis = infection of kidneys causing distension of kidney
- Hydroureter = dilation of ureter(s) due to backflow of urine
- Obstructive Nephropathy = urinary tract obstruction causing functional impairment of kidney
Outline the two types of Urinary Obstruction
- Unilateral obstructive uropathy: Stones; iatrogenic injury; malignancy
- Bilateral obstructive uropathy: BPH; PC; Urethral strictures; Instrumentation
State 3 risk factors of Urinary Obstruction.
- BPH
- Constipation
- Medication: Narcotic analgesia/Anticholinergics/alpha-agonists
- Malignancy
- Posterior urethral valves
- Urolithiasis
- Neurological disease
A 37 year old man presents with severe flank pain radiating from loin to groin on a background of acute fever and dysuria. He reports increased urgency and frequency as well as incomplete voiding. He has no significant medical history other than previous bouts of obstipation and BPH. He has no significant family history.
O/E he had a distended bladder and haematuria from urinalysis.
Urinalysis showed leukocytes and haematuria. FBC showed low haemoglobin. A US-Renal showed hydronephrosis and a CT-KUB showed a radiopaque lesion present in the ureter with distension proximal to the lesion.
What is your DDx? (give more than 1)
What does your Tx depend on?
Urolithiasis with 2º Urinary Obstruction, Pyelonephritis and Hydroureter
Size of calculi (1cm) ; Sepsis
• ESWT
OR
• A-blocker: Tamsulosin
-> Stone < 10mm
OR
• Percutaneous nephrolithotomy
-> Stone > 10mm
If Sepsis,
• Analgesia: Morphine (2-4mg IV 3-4 hours) \+ • Fluids \+ • ABX: Ceftriaxone (1-2g IV 12-24 hours) ± • Surgery: Nephrostomy/Stent
Calculi – Sepsis: Unilateral or Bilateral
1st
• Analgesia: Morphine (2-4mg IV 3-4 hours)
+
• Fluids
+
• A-adrenoceptor blocker: Tamsulosin
What is a UTI?
Umbrella term for infection of the urinary tract (KUBU) characterised by dysuria, polyuria, Nocturia and suprapubic pain
Outline the ways of categorising a UTI
- Uncomplicated: UTI in healthy individual
- Complicated: UTI with functional or structural impairments e.g. GU tract abnormalities or drug-resistant pathogens
- Acute: Infected urine = infection Sx
- > E.g. Urethritis; Cystitis
- Recurrent: Two separate culture-proven episodes of UTIs within 6/12
- > E.g. Pyelonephritis; Epididymo-orchitis
State 3 risk factors for a UTI.
- Renal tract obstruction (BPH, stones, stricture)
- Previous UTI
- Age ≥ 50 years
- Instrumentation of renal tract e.g. Catheterisation, Urological
Give three pathogens likely to cause a UTI
- E. coli (70%)*
- S. saprophyticus
- P. mirabilis
- Klebsiella spp.
A 65 year old man presents with painful urination, increased frequency and urgency as well as urinating at night. He has a past medical history consisting of previous UTIs, obstructive nephropathy which was treated with catheterisation. There is no family history of note and no documented developmental or birth defects.
O/E he has suprapubic pain and an inflamed head of penis with itchy urethra.
Urinalysis shows leukocytes and nitrites. Microscopy shows gram-negative, rod-shaped bacterium whilst CT-KUB shows no abnormalities.
What is your DDx?
How would you treat this?
UTI with 2º urethritis
• ABX: Ciprofloxacin/Levofloxacin
Define pyonephritis
inflammation of the kidney due to a bacterial infection
Give 3 risk factors for pyonephritis
- Acute pyelonephritis
- Vesicoureteral reflux
- Obstruction
- Renal calculi
- Diabetes Mellitus
What is the most common pathogen to cause pyonephritis?
Escherichia coli (E. coli)