Urology Flashcards
How are male LUTS assessed?
IPSS scoring out of 35 graded mild/moderate/severe
What is the main risk factor for BPH?
Age
What are the long term consequences of BPH progression?
Likelihood of surgery, risk of retention
What percentage of LUTS are bothersome in men over 65?
30 percent
Give examples of voiding LUTS?
Weak/intermittent stream Straining Hesitancy Terminal dribbling Incomplete emptying
Give examples of storage LUTS?
Urgency
Frequency (more than 7 times)
Nocturia (3 times or more)
Give an example of post micturition LUTS?
Dribbling
Which medication is given to patients with BPH and ED?
Tedafil
What are the first line investigations in LUTS?
History and abdominal exam
DRE
What are the second line investigations in LUTS?
Urine dip
Frequency volume chart for 3 - 7days
PSA
Maybe biopsy if suspected malignancy and creatinine in suspected AKI/CKD
Which IPSS score is mild?
0-7
Which IPSS score is moderate?
8-19
Which IPSS score is severe?
20-35
What is the size of a normal prostate?
20cc (walnut)
What is the size of a enlarged prostate?
30cc (ping pong ball)
What other than BPH can be felt on DRE?
Faecal loading/impaction
Rectal tumours
When should a PSA test be carried out?
LUTS suggest bladder outlet obstruction secondary to BPH
Prostate abnormal on DRE
Cancer suspected
Which investigations are not routinely offered in BPH diagnosis?
Cystoscopy
KUB scan
Flow rate measurement
Post residual volume USS
What urine flow rate suggests obstruction?
Less than 15ml/s
What is benign bladder obstruction?
Bladder impinged by prostate
How can benign bladder obstruction lead to AKI?
Retrograde flow of urine
How is benign bladder obstruction treated?
Catheter
What is the treatment if voiding symptoms are persistent beyond pharmacological treatment?
Intermittent or indwelling catheter
Is bladder training more effective than surgery?
No
Which non pharmacological treatment is advised for post micturition dribbling?
Urethral milking
How does an alpha blocker work?
Blocks alpha 1 adrenergic receptors in the prostate, urethra, bladder neck and detrusor muscle to relax smooth muscle and allow urine to flow
What are the advantages of alpha blockers?
Work quickly to relieve LUTS
Well tolerated
What are the disadvantages of using an alpha blocker?
No effect on BPH progression/serious complications
Does not alter PSA
What treatment should be given in moderate to severe LUTS?
Alpha 1 blocker e.g. tamulosin
When should a 5 alpha reductase inhibitor be given?
LUTS + prostate over 30g +/- PSA >1.4ng/ml with a high risk of BPH progression
Give examples of a 5 alpha reductase inhibitor
Finasteride
Dutasteride
What is the mechanism of action of 5 alpha reductase inhibitors?
Reduction in DHT synthesis so reduces the androgen drive of prostate growth.
When does max shrinkage occur with 5 alpha reductase inhibitors?
3-6months
What is the difference between finasteride and dutasteride?
Dutasteride inhibits the type I and II isoenzyme but Finasteride only inhibits the type II isoenzyme
What are the side effects of 5 alpha reductase inhibitors?
Erectile dysfunction
Retrograde ejaculation
Decreased libido
Ejaculation failure
When should both a 5 alpha reductase inhibitor and alpha 1 blocker be given?
Bothersome moderate to severe LUTS
Possible with enlarged prostate or PSA>1.4ng/ml
What additional pharmacological treatment may be beneficial in bladder outlet obstruction?
Anticholinergic
What are the risk factors for BPH progression?
Age over 70 with LUTS IPSS >7 (moderate to severe LUTS) PSA>1.4ng/ml Prostate > 30g Flow rate
How is acute urinary retention treated?
Catheterise and give alpha blocker before withdrawing 48 hours later
What treatment should be given in frequent retention?
TURP
When can TURP be offered?
Frequent retention
Severe voiding symptoms with little response to alternative treatments
How can storage be treated as a last resort?
Botox injection into bladder or percutaneous tibial nerve stimulation
How often should alpha blockers be reviewed?
After the first 4 to 6 weeks then every 6 to 12 months
When should 5 alpha reductase inhibitors be reviewed?
After 3-6m and then every 6-12m
When should anti cholinergic be reviewed?
After the first 4-6weeks and then every 6-12m
What makes up the upper urinary tract?
Ureters + renal pelvis + kidneys
What makes up the upper urinary tract?
Bladder and urethra
What lines the upper urinary tract and bladder?
Urothelium (transitional epithelium)
What lines the membranous and spongy urethras?
Pseudo stratified columnar epithelial
Which age group has the highest prevalence of UTIs?
The elderly
What is the prevalence of UTIs in elderly women?
20 to 30 percent
What is the prevalence of UTIs in elderly men?
10 percent
What are the 3 routes of infection that cause a UTI?
- Ascending up the urethra
- Lymphatic (IBD, retroperitoneal abscess)
- Haematogenous (uncommon)
Explain how bacteria ascend up the urethra?
Bacteria colonise the peritoneum from the colon and enter the urethra and ascend upwards
What does bacteria without pyuria suggest?
Urine is colonised but there is not active infection
What does pyuria without bacteria suggest?
Infection
Carcinoma in situ
TB
Bladder stone
Where do the white blood cells that cause pyuria come from?
Urothelium
What is an uncomplicated UTI?
Patient has an anatomically normal urinary tract and responds quickly to antibiotics
What is the most common way that patients get an uncomplicated UTI?
Hospital acquired (85 percent)
What pathogen is primarily responsible for uncomplicated UTI?
E. coli (85 percent)
Which pathogens can lead to UTI?
E. coli Staph saprophyticus Strep faecalis Proteus Kliebsella
What is a complicated UTI?
Underlying anatomical abnormality or a functional abnormality making the patient unresponsive to antibiotics
What percentage of complicated UTI cases were due to E. coli infection?
50 percent
What is an isolated UTI?
At least 6m between infections
What are recurrent UTIs?
More than two infections in 6 months OR more than 3 infections in 12 months
What is a re-infection in UTIs?
Infection with a different organism
What is persistent infection in UTIs?
Infection with the same organism
Give examples of persistent infections in the urinary tract?
Calculi
Chronically infected prostate
What is an unresolved UTI?
The UTI does not go away
What can cause an unresolved UTI?
Inadequate antibiotics
Bacterial resistance
What is cystitis?
Bladder infection/inflammation
What are the symptoms of cystitis?
Suprapubic discomfort
Dysuria
Urgency
Small volume voids
What is the first line investigation for a suspected UTI?
Midstream urine dip - look for leucocytes and nitrates
Are leucocytes or nitrates more specific to UTI?
Nitrates
Are leucocyte or nitrate more sensitive for UTI?
Leucocyte
What is the second line investigation for UTI?
Urine microscopy and culture (do even if the patient has an unremarkable urine dip)
What are the third line/ further investigations for UTI?
Abdominal X ray
USS KUB
IV urogram/ CT urogram
When should a CT urogram be done in favour of IV urogram when investigating UTIs?
Anatomical abnormality
What is the first line treatment in uncomplicated UTI?
Short course trimethoprim
What is the first line treatment in complicated UTI?
Co-amoxiclav (7-10 day course)
What is pyelonephritis?
Inflammation of the kidney usually due to bacterial infection
What are the signs and symptoms of pyelonephritis?
Flank and loin pain
Nausea and vomiting
Fever and chills
LUTS
What is the first step in investigating pyelonephritis?
Urine dip
What bloods are necessary in pyelonephritis?
FBC, UandEs and blood culture
Which imagining modalities should be used to investigate pyelonephritis?
AXR
Renal USS
CT urogram
Which organism is responsible for 80 percent of pyelonephritis cases?
E. coli
What is the first line treatment in pyelonephritis?
10 days oral trimethoprim (ciprofloxacin in penicillin allergy)
When should IV antibiotics be used in treating pyelonephritis?
If systemically unwell or sepsis
What is a dangerous complication of pyelonephritis?
Perinephric abscess
Where do perinephric abscesses arise?
Gerota’s fascia (fascia around kidneys and adrenals)
What factors make a perinephric abscess more likely in pyelonephritis?
Diabetes
Obstructive calculi
How a perinephric abscess managed?
Drain and collection
Give antibiotics until radiological resolution
What is urinary calculus?
A solid conglomeration of mineral salts, with or without associated urinary proteins
What the 4 types of stones?
Calcium oxalate
Uric acid/urate
Magnesium ammonium sulphate
Cysteine
Which urinary stone is the most common?
Calcium oxalate
What is the most common stone composition?
80% calcium oxalate + 20% calcium phosphate
If a pure stone is found, what is the most likely aetiology?
Metabolic disorder
Which type of stone is completely insoluble?
Calcium oxalate
What are the two classifications of calcium oxalate stones?
- dehydrate (softer)
2. monohydrate (harder)
Which stones do not appear on X ray?
Cysteine
Uric acid
What type of stone appears best on X-ray?
Calcium oxalate
Which type of stones appear on X-ray?
Calcium oxalate
Uric acid (reasonably)
Magnesium ammonium phosphate/ stuvite (poorly)
Which underlying conditions may cause someone to present with calcium phosphate stones?
Hyperparathyroidism Type 1 distal renal tubular acidosis Medullary sponge kidney Urinary stasis Infection
Are calcium phosphate and stuvite stones usually hard or soft?
Soft
Which two stones are often linked?
Calcium phosphate and stuvite
Other than calcium phosphate, which other stones are stuvite stones linked to?
Staghorn calculi
Which genetic disease can lead to cysteine stones?
Cysteinuria
Are cysteine stones hard or soft?
Hard
When a cysteine stone is lasered, what phenomena is seen?
White smoke with a rotten egg shell smell
Which gas causes a rotten egg smell?
H2S
How are cysteine stones typically treated?
Medical dissolution therapy
Which type of stone is due to HIV HAART? (so rarely seen these days)
Idinavir
Which type of stones do not appear on CT?
Idinavir
What unit of measurement is used to predict the success in treating stones?
Hounsfield units (analysis of radiodensity on CT)
Explain the free theory of stone formation?
Constituents to make stones are in very high concentration and are unopposed in urine