21 - Obstruction Flashcards
What are some non malignant causes of changes to urinary flow?
- BPH
- UTI
- Urinary tract stone disease
- Urological emergencies (urinary retention, acute loin pain, acute renal failure, systemic sepsis, spinal cord compression)
- Urological trauma
What are causes of ureteric obstruction?
- Intraluminal: stones, sloughed papilla, clots
- Intramural: PUJO, benign strictures from TB or surgery
- Extraluminal: retroperitoneal malignancy and mets, retroperitoneal fibrosis, bladder cancer, prostate cancer
How does acute ureteric obstruction present, what is it usually caused by and how do we diagnose it?
- Renal colic due to calculus
- Acute severe flank pain radiating to groin
- Can be pyonephrosis on top
- Need plain CT or ultrasound
- Emergency as can develop sepsis
How does chronic ureteric obstruction present, what is it usually caused by and how do we diagnose it?
- Painless
- Bi or uni lateral
- Often found incidentally or during renal failure
- Often due to external obstruction
What is the definition of obstructive uropathy?
Renal impairment due to bilateral or uni lateral ureteric obstruction, or high pressure chronic retention
It is a cause of high pressure chronic retention and can get hyperkalaemia as reflux back into kidneys
What is pyonephrosis?
Infection of the kidneys’ collecting system due to obstruction. Pus collects in the renal pelvis and causes distension of the kidney. It can cause kidney failure and sepsis so treat like septic patient
Apart from CT and ultrasound, how can we diagnose that a dilated kidney is due to obstruction?
What is the presentation of ureteric colic?
How can you treat ureteric obstuction?
Decompress if emergency as risk of sepsis and then one of these procedures
What is pelviureteric junction obstruction?
- Often congenital but can present at any stage in life or be asymptomatic and found on imaging by hydronephrosis
- Often loin pain worse after heavy fluid intake or alcohol
- Laproscopic pyeloplasty
What is retroperitoneal fibrosis?
Fibrosis around the aorta that can pull the ureters in and cause an obstruction
Need to decompress, exclude malignancy and give immunosuppression
What is the difference between acute and chronic urinary retention?
Chronic can be painful when acute on chronic and can also be high pressure or low pressure
What is the definition of urinary retention?
- Inability to voluntarily urinate
- Acute urinary retention is the sudden and often painful inability to void despite having a full bladder
- Chronic urinary retention is painless retention associated with an increased volume of residual urine
What are some causes of urinary retention in men and women?
How do we treat acute urinary retention?
- Catheterise and record residual volume first
- History
- Exam e.g abdomen, DRE, genitalia
- Urine Dip
- Treat causes like constipation or alpha blocker for prostate issues
How should you treat someone with acute urinary retention due to issues with their prostate?
- Alpha blocker
- TWOC after 1-2 weeks of blocker
- If fails do TURP
What is the difference between high and low pressure chronic urinary retention?
How should we manage chronic urinary retention?
High pressure: same as acute e.g catheterise etc, but cannot TURP so need constant catheter
Low pressure: TURP works in 50% but usually intermitten self catheterisation or long term catheter
Monitor overnight for post obstructive diuresis
What is post-obstructive diuresis?
Prolonged urine production for at least two consecutive hours immediately following the relief of urinary retention. Can lrad to dehydration and electrolyte imbalance so might need fluids
