urology Flashcards
*retracted testes with negative cremasteric reflex
Testicular torsion
*adult with a hydrocele
Refer urgently for a testicular US - could be a tumour
In babies - resolves within a year usually
First line investigation for testicular mass
Ultrasound
*periureteric fat ‘stranding’
Can indicate the passage of a recent renal stone
Most common type of renal stone
Calcium oxalate
Which renal stones are NOT opaque (radiographically)
Urate
Cystine
Xanthine
*stag-horn calculus
These renal stones involves the renal pelvis and are composed of struvite
Gold standard for suspected urolithiasis
CT KUB (ct of kidneys, ureters and bladder)
Management of acute urinary retention
Emergency !
Catheterisation and decompression
What may develop after catheterisation due to acute urinary retention
Post-obstructive diuresis
What occupational exposure is a recognised risk of developing transitional cell cancer
Aniline dye
*transilluminates, not tender to touch
Hydrocele
Gold standard for renal calculus
CT non-contrast
US + X-ray brings up accuracy only a bit
What is hydronephrosis
When stone comes down the tract and stretches it
Small stone
<4mm
Medium sized stone
> 4mm - 2cm
Large kidney stone
> 2cm
Management of small sized kidney stone
Conservative management + observe
On the US a year on check up to see if its gotten any bigger
But should pass by itself
Renal colic included symptoms
Flank pain radiating down leg / groin
Nausea
Microcytichaematuria
Management of medium sized stone
ESWL
FLexible URS + Laser
PCNL
What is ESWL
‘Shockwave lithotripsy’
—> patient put under sedation , ballon attached to skin over flank , high frequency sound waves target the stone - which then fragments and get passed down the ureter
Side effects of ESWL
Haematoma to gut
Haematuria
Quite aggressive tool but effective
What is flexible URS + laser
‘Urothroscopy’ = camera going through ureter to the stone
Once the stone is found , the laser fragments the stone into smaller pieces which is then passed
Can’t have anaesthetic , infection risk - the stone harbours bacteria as well as external source, hydronephrosis developing into pyelonephritis
But has a higher clearance rate than ESWL (90% success rate)
Management for large stone
PCNL = percutaneous nephrolithodotomy
What is PCL
Patient goes under anaes. Needle inserted through skin via wire , a tract is built from outside to kidney and camera goes in and then breaks stone —> which are then extracted externally
Benefit = can be more specific in target and can clear completely (highest rate of clearance)
Side effects of PCNL
Risk of bleeding
Injury to associated structures (diaphragm —> pneumothorax, liver, spleen etc)
First line for renal colic
Diclofenac (NSAIDs)
How to decide who goes to theatre with a ureteric stone
- Pain (not controlled)
- Single kidney (bilateral , one missing)
- Infection - can spread very rapidly to the rest of the body
- Stone >7mm cannot be managed conservatively
- Multiple stones
What are the two management options of ureteric stones
- ESWL
- Uretothroscopy (main)
Renal stone vs ureteric stone symptoms
Ureteric = 12/10 pain , this one is worse due to back flow pressure back into the kidney
What is the JJ stent
Stent between kidney and the bladder - to stop scarring / sclerosis from laser and stuff which would cause blockage
Patient brought back in a few weeks later to get stent removed
Risk factors for pyelonephritis
Female
DM
On steroids
Immunocompromsied
Past urological procedures
History of stones
How does pyelonephritis present
Macroscopic haematuria
Flank and back pain
Fever
*loin percussion tenderness
Pyelonephritis
Percussing with a closed fist over the flank - due to the oedema around the kidney the neural supply is even more sensitive - patient has severe pain
Mx of stable pyelonephritis
(Normal vitals and no significant fever)
= oral abx for up to 7 days
Mx of unstable pyelonephritis
Admit to hospital
IV abx (but need a culture before staring abx - if culture taken after the abx can mask what’s there)
What are the causative organism common in pyelonephritis
E.coli
Klebsiella
Pseudomonas
(All gram neg.) and can be treated with trimethoprim (oral) or co-trimoxazole (oral)
Patient admitted with pyelonephritis caused by gram neg - what is the treatment ?
IV gentamicin
Treatment of pyelonephritis caused by gram +
Co-amoxiclav.
(If don’t know causative organism then can prescribe both co-amoxiclav. and gentamicin)
Treatment of pyelonephritis due to anaerobe ?
Metronidazole
Pregnancy complications of pyelonephritis
Premature labour
IUGR
Stillborn
Why does every pregnant mother get a urine dipstick in first trimester
Rule out infection just in case - can do foetal damage
Safest antibiotic for pregnant woman with pyelonephritis
Trimethoprim
Amoxicillin
Also cephalosporins
Investigation for prostate cancer - initial
MRI prostate (lymph nodes, mets, local cancer)
Diagnostic for prostrate cancer
MRI (gold standard)
Who qualifies for an MRI of prostate in suspicion
PSA <20
T1/T2 (localised)
<80 years
*PSA >20 , T3/T4 disease
What investigation appropriate ?
Bone scan (for mets —> osteoblastic areas)
CT of chest , abdo, pelvis (for lymph nodes)
What is normal PSA
<4
PET scan after treatment of prostate cancer ?
Check for radiotherapy damage
PIRADS grading system ?
Local cancer for prostate cancer (4/5 is typical for cancer)
Commonest place on the prostate for cancer to develop ?
Peripheral zone
(Can be detected on DRE)
For BPH cancer is in the transitional zone (presses on the ureter)
Treatment for prostate cancer
A. Localised cancer and patient is healthy (no bone mets/lymphadenopathy) —> robotic prostatectomy (removal of prostate and capsule (tissue around it)), can also give localised radiotherapy (brachytherapy)
B. Locally advanced (ie lymph nodes but no mets) —> radiotherapy OR hormonal (usually no surgery)
C. Metastatic (PSA = 150, bone mets, back pain etc) —> hormonal therapy with GnRH agonist / antagonist (definitely no surgery)
How do GnRH work to help metastatic prostate cancer
GnRH released by hypothalamus —> LH/FSH to be released from ant. Pit. —> testosterone (released from testes and reticularis) —> AGONIST : causing LH/FSH to downregulate ( chronically, acutely this causes an increase in testosterone initially ) —> leading to cessation of testosterone production
*need to use and anti-androgen with a GnRH agonist to stop testosterone flair , why antagonist is used by itself - no flair
What needs to be co-prescribed with GnRH Agonist
Anti-androgens (ie -amides)
Limitation of hormonal therapy in treatment of prostate cancer
Only lasts about 3 years - body changes to keep up with hormonal change —> would then start to use chemo.
What is PSA density
For every gram of prostate per PSA
> 0.15mg/dl tells of cancer (normal should be 0.1)
Can use this to distinguish between BPH and cancer
Causes of BPH
- Testosterone
- Genetic
- Oestrogen diet (soya + red meat)
- Idiopathic (mainly)
What is IPSS
International prostate stimulation score
Measures age, quality of life, obstructive symptoms, bladder related symptoms
*nocturnal incontinence
Retention , patient in trouble
Investigation for BPH
- PSA
- Uroflow (chart on how fast man is peeing)
- Bladder scan (to check for post-void residual)
Management of BPH
- Conservative - dietary (stop caffeine (causes detrusor muscle dysfunction - incontinence)), timed voiding, nocturia - stopping fluid 2-3 hours before bed and have one set alarm to wake up and go
- Alpha block - tamsulosin 0.4mg 1d SYMPTOMATIC CONTROL BY RELAXING TRIGONE AND PROSTATIC URETHRA (causing it to widen —> easier passage of urine, no change in prostate size)
- 5-a-reductase inhibitors - finesteride (reduces size of prostate by 1/3, the epithelium)
Side effects of tamsulosin
Postural hypotension
Dry ejaculations (could be used as male contraception!)
Contraindicated in acute closed angle glaucoma
MoA of Finesteride
Stops conversion of testosterone —> DiHydroTestosterone (active)
Therefore side effects can include: anxiety, decrease in libido, increase chance of ED, depression
Resection of prostate in BPH ?
If prostate is >20-80g and no response to 5-a-reductase etc
Then TURP (transurethral resection of prostate) , peeling back layers of prostate
What is Steam therapy for BPH
Steam injected into prostate (9 seconds each) and this causes coagulative necrosis
Benefits = no loss of sexual function , no bleeding (like in TURP)
Treatment of prostate hyperplasia of >80g
HOLFP
‘Homeum Laser enucleation of the prostate’
Laser peels of prostate of the capsule around it, the central and transitional zone peeled away , this is pushed into the bladder where it is then sucked out
Benefits - day procedure (no prostate left)
Limitation of TURP
Prostate could regrow