Genitourinary Flashcards
Define nephrolithiasis
Renal stones/renal calculi. Stones form in the renal pelvis of the kidney and can travel down the ureters. Majority (80-90%) are calcium oxalate stones (radio-opaque). Other types: calcium phosphate, uric acid (radio-lucent: not seen on x-ray), struvite (produced by bacteria), cystine.
Describe the epidemiology of nephrolithiasis
Very common. More in men (testosterone > increased oxalate)
Describe the aetiology of nephrolithiasis
Chronic dehydration, obesity, high protein/salt diet, recurrent UTIs, low urine output, hyperparathyroidism/hypercalcaemia
Describe the pathophysiology of nephrolithiasis
Excess solute in chronic dehydration causes supersaturated urine which favours crystallisation. Stones cause regular outflow obstruction (hydronephrosis). This leads to dilation and obstruction of renal pelvis. Stones commonly get stuck at pelvo-ureteric junction, vesico-ureteric junction and pelvic brim.
What are the key presentations for nephrolithiasis
Renal colic = severe colicky unilateral pain originating in loin and radiating to groin. Patient can’t lie still. Haematuria, nausea and vomiting, reduced urine output
What is the gold standard investigation for nephrolithiasis
Non-contrast CT KUB (kidney, ureter, bladder) – presence of stones. Can only see radio-opaque stones in USS
Describe the first line investigations for nephrolithiasis
Urine dipstick: haematuria, leukocytes, nitrates. FBC, CRP (infection), U&Es (hypercalcaemia). Abdominal x-ray (will show calcium stones but not uric acid stones as they are radiolucent)
Describe the differential diagnosis for nephrolithiasis
Peritonitis, appendicitis, UTI
Describe the management for nephrolithiasis
Symptomatic relief – hydration, NSAIDs (diclofenac). Antiemetics, antibiotics. Watchful waiting – stones under 5mm should pass spontaneously without infection
Elective treatment if too big – Extracorporeal Shock Wave Lithotripsy ESWL (break stone into smaller fragments using shockwaves), ureteroscopy and laser lithotripsy, PCNL (percutaneous nephrolithotomy, use nephoscope to remove stone)
Lifestyle: decrease sodium and protein intake, increase citrus fruit, adequate fluid intake
Describe the complications for nephrolithiasis
Obstruction (leading to AKI), infection (leading to pyelonephritis)
Define acute kidney injury
Sudden decline in kidney function determined by increased serum creatinine and decreased urine output. NICE criteria for AKI (KDIGO classification):
Rise in creatinine of >26 micromol/L in 48 hours
Rise in creatinine of >50% from baseline in 7 days
Urine output of <0.5ml/kg/hr for >6 hours
Describe the aetiology of acute kidney injury
Pre-renal: inadequate blood supply to kidneys – dehydration, hypotension (shock), heart failure
Intra-renal: intrinsic disease in kidney leads to reduced filtration – glomerulonephritis, interstitial nephritis, acute tubular necrosis
Post-renal: obstruction to outflow of urine in kidney causing back pressure and reduced function – obstructive uropathy: kidney stones, cancerous masses, ureter/urethra strictures, enlarged prostate or prostate cancer
What are the risk factors for AKI
Hypotension, volume depletion, CKD, heart failure, diabetes, cirrhosis, nephrotoxic meds (NSAIDs, ACEi), cancer, trauma
Describe the pathophysiology of AKI
Pre-renal: low blood volume > decreased perfusion > decreased GFR and creatinine clearance
Intra-renal: kidney damage > decreased oncotic and hydrostatic pressure > decreased GFR
Post-renal: obstruction > back pressure into kidney > decreased hydrostatic pressure > decreased GFR
Decreased GFR leads to build up of normally excreted substances: creatinine, K+ (arrhythmias), urea (confusion, uraemia), fluid (oedema), H+ (acidosis)
Describe the key presentations for AKI
Reduced urine output, high creatinine, hyperkalaemia (arrhythmias, muscle weakness), uraemia (pericarditis, N+V, encephalopathy), fluid overload (pulmonary and peripheral oedema, hypovolemic shock, orthopnoea), hypotension, sepsis/acute illness
Describe the clinical manifestations for AKI
Signs: Pre-renal: hypotension, syncope, D+V
Intra-renal: infection, signs of underlying disease
Post-renal: lower urinary tract symptoms (LUTS) – low urine output
Symptoms: Vomiting, nausea, fever, dizziness, altered mental status
What is the gold standard investigation for AKI
Metabolic profile: U&E (GFR) and creatinine – raised serum creatinine, reduced urine output
Describe the first line investigations for AKI
NICE criteria for AKI (KDIGO classification):
Rise in creatinine of >26 micromol/L in 48 hours
Rise in creatinine of >50% from baseline in 7 days
Urine output of <0.5ml/kg/hr for >6 hours
Determine cause: urea:creatinine ratio – pre-renal (>100:1), intrarenal (<40:1), post-renal (40-100:1)
Metabolic panel and urine output monitoring: raised serum creatinine, low urine output, raised potassium, metabolic acidosis (raised H+)
Urinalysis: leucocytes and nitrates (infection), proteinuria and haematuria (acute nephritis)
Other: FBC, CRP, renal ultrasound, ECG (hyperkalaemia)
Describe the differential diagnosis for AKI
Chronic kidney disease, renal stones, tubular necrosis
Describe the management for AKI
1st line - Treat underlying cause (hypotension, stones, infection). Stop nephrotoxic drugs (NSAIDs, ACEi). Treat complications (electrolyte imbalances).
Severe – renal replacement therapy: haemodialysis (indicated in AFUK: acidosis, fluid overload, uraemia + complications, K+ >6.5)
Describe the complications for AKI
End-stage renal failure, chronic kidney disease, metabolic acidosis, uraemia > encephalopathy, pericarditis
Define bladder cancer
Cancer in bladder arising from urothelium. Most common subtype = transitional cell carcinoma. Others = squamous cell carcinoma (schistosomiasis increases likelihood), adenocarcinoma
Describe the epidemiology of bladder cancer
Old men, people who work in rubber/dye industry
Describe the aetiology of bladder cancer
Mutation
Describe the risk factors for bladder cancer
Exposure to dyes/rubber/leather/textiles/paint (aromatic amines – dye factor worker, hairdresser, painter). Age >65, male, Caucasian, smoking, pelvic radiation
What are the key presentations for bladder cancer
Painless haematuria (macro or microscopic), urgency, dysuria, suprapubic/pelvic mass, pelvic pain, recurrent UTI
Describe the clinical manifestations for bladder cancer
Signs of metastases: bone pain, weight loss
What is the gold standard investigation for bladder cancer
Flexible cystoscopy and biopsy
Describe the first line investigations for bladder cancer
urinalysis for microscopy and culture (haematuria), bladder USS
Describe the differential diagnosis for bladder cancer
Benign prostatic hyperplasia, UTI, haemorrhagic cystitis
Describe the management for bladder cancer
Conservative: cancer support nurse
Medical: chemotherapy, radiotherapy
Surgical: transurethral resection of bladder tumour TURBT, or cystectomy (remove bladder), lymph node dissection if spread
Describe the prognosis for bladder cancer
5 year survival rate is 75%
Define renal cancer
Renal cell carcinoma is most common type. Adenocarcinoma arising from proximal convoluted tubule
Describe the risk factors for renal cancer
Smoking, obesity, hereditary, von Hippel-Lindau
What are the key presentations for renal cancer
Triad: Haematuria, flank pain, palpable mass. May have left varicocele
Describe the clinical manifestations for renal cancer
Symptoms: Cancer symptoms: weight loss, fatigue, anorexia, night sweats
What is the gold standard investigation for renal cancer
CT chest/abdo/pelvis
Describe the first line investigations for renal cancer
Abdominal/pelvis ultrasound, bloods: raised RBC, raised calcium, raised LDH
Describe the management for renal cancer
1st – nephrectomy/partial nephrectomy
Describe the complications for renal cancer
Paraneoplastic changes – polycythaemia, Cushing’s, hypertension, hypercalcaemia
Define prostate cancer
Malignant tumour of glandular origin in the prostate. Mostly adenocarcinomas which grow in the peripheral zone of the prostate. Very slow growing.
Describe the epidemiology of prostate cancer
Most common cancer in men, most hormone sensitive cancer
Describe the aetiology of prostate cancer
Mutation
What are the risk factors for prostate cancer
Increasing age, family history, Afro-Caribbean, anabolic steroids
Describe the pathophysiology of prostate cancer
Prostate cancer is almost always androgen-dependent, requiring androgen hormones (e.g., testosterone) to grow
What are the key presentations for prostate cancer
LUTS – frequency, hesitancy, weak flow, dribbling, nocturia. bone pain, weight loss, fatigue, night sweats
Describe the clinical manifestations for prostate cancer
Haematuria, erectile dysfunction, metastases (bone – sclerotic bony lesions, brain, liver, lungs)
What is the gold standard investigation for prostate cancer
Transrectal USS and biopsy
Describe the first line investigations for prostate cancer
Prostate exam and digital rectal exam (firm, hard, asymmetrical, rough), prostate specific antigen in community (raised), multiparametric MRI
Other: Gleason grading system (based on histology of biopsy. Higher score = worse prognosis)
What are the differential diagnosis for prostate cancer
Benign prostatic hyperplasia, chronic prostatitis
Describe the management for prostate cancer
Local: prostatectomy (<70), active surveillance (>70 and low risk), external beam radiotherapy, brachytherapy
If metastatic: chemotherapy, radiotherapy, bilateral orchidectomy (gold standard hormonal treatment), androgen deprivation therapy (goserelin – LHRH agonist), palliative treatment to relieve symptoms (e.g., transurethral resection of prostate TURP)
Describe the complications for prostate cancer
Metastases (bone, liver, lungs, brain), erectile dysfunction, incontinence
Describe the prognosis for prostate cancer
Localised: 100%, metastatic 30%
Define testicular cancer
Cancer arising from germ cells in the testes. 90% are germ cell cancers (seminomas, teratomas), rest are non-germ cell cancers (Leydig, Sertoli, lymphoma)
Describe the epidemiology of testicular cancer
Young men (15-35)
Describe the aetiology of testicular cancer
Mutation
What are the risk factors for testicular cancer
Undescended testes (cryptorchidism), male infertility, family history, increased height, HIV
What are the key presentations for testicular cancer
Palpable painless lump in testicle which does not transilluminate (light can’t get through)
Describe the clinical manifestations for testicular cancer
Haematospermia (blood in semen), gynecomastia
What is the gold standard investigation for testicular cancer
Urgent USS (doppler) of testes – testicular mass
Describe the first line investigations for testicular cancer
Urgent USS (doppler) of testes, tumour markers (alpha fetoprotein raised in teratomas, beta hCG raised in seminomas and teratomas, lactate dehydrogenase non-specific raised)
Other: Chest x-ray if symptomatic for pulmonary metastases, royal Marsden staging
What are the differential diagnosis for testicular cancer
Testicular torsion, epididymo-orchitis, hydrocele
Describe the management for testicular cancer
1st line – urgent radical orchidectomy +/- testicular prosthesis
Semen cryopreservation, metastatic – lymph node removal, chemotherapy, radiotherapy
What are the complications for testicular cancer
Infertility, hypogonadism, peripheral neuropathy
Describe the prognosis for testicular cancer
98% 5 year survival rate
Define chronic kidney disease
Chronic reduction in kidney function which is permanent and progressive. >3 months.
Diagnosis: eGFR < 60mL/min/1.73m¬2 or,
eGFR <90mL/min/1.73m2 + signs of renal damage (protein/haematuria, pathology on imaging/biopsy) or,
albuminuria > 30mg/24hrs (albumin:creatinine >3mg/mmol)
Describe the aetiology of chronic kidney disease
Diabetes, hypertension, glomerulonephritis, polycystic kidney disease, nephrotoxic drugs (NSAIDs, ACEi), persistent pyelonephritis, obstruction
What are the risk factors for chronic kidney disease
Diabetes, hypertension, male, increasing age, smoking
Describe the pathophysiology of chronic kidney disease
Many nephrons are damaged causing decreased GFR when increases burden on remaining nephrons. Compensatory RAAS to increase GFR but trans-glomerular pressure is shearing, and a loss of basement membrane permeability causes protein/haematuria.
What are the key presentations for chronic kidney disease
Asymptomatic until end-stage (remaining nephrons still work for a while). Symptoms due to substance accumulation: uraemia (pruritis, nausea, uraemic frost, restless legs, encephalopathy, pericarditis), fluid (oedema, raised JVP), potassium (arrhythmias, muscles weakness), oliguria (low urine output), peripheral neuropathy
Describe the clinical manifestations for chronic kidney disease
Signs: Haematuria, proteinuria, peripheral neuropathy, hypertension, oedema
Symptoms: Pruritis, loss of appetite, nausea, muscles cramps, pallor, fatigue
What is the gold standard investigation for chronic kidney disease
U&E for estimated GFR (eGFR < 60mL/min/1.73m¬2 or, eGFR <90mL/min/1.73m2 + signs of renal damage)
Describe the first line investigations for chronic kidney disease
FBC (anaemia of CKD), U&E (raised creatinine, phosphate, potassium. Decreased eGFR), urinalysis (haematuria, proteinuria), raised urine albumin (albumin:creatinine >3mg/mmol), renal USS (bilateral renal atrophy)
Other: GFR function staging. 1: eGFR>90. 2: 60-89, 3a: 45-59, 3b: 30-44, 4: 15-29, 5: <15 (ESRF)
What are the differential diagnosis for chronic kidney disease
Diabetic neuropathy, nephrotic syndrome, obstructive uropathy
Describe the management for chronic kidney disease
Refer to specialist if eGFR <30, albumin:creatinine ratio >70.
Slow progression and prevent CVD (obesity, hypertension – ACEi, ARB, CCB, diabetes - metformin, diet, statin). Treat complications: anaemia (ferrous sulphate, erythropoietin), oedema (fluid restriction, diuretics), metabolic acidosis (sodium bicarbonate), CKD-mineral bone disease (vitamin D), CVD (statins).
End-stage: renal replacement therapy (eGFR <15) dialysis. Eventually kidney transplant = cure.
Describe the complications for chronic kidney disease
Anaemia, CKD-mineral bone disease, neuropathy, encephalopathy, cardiovascular disease
Define benign prostatic hyperplasia
Hyperplasia of the stromal and epithelial cells of the prostate causing prostate enlargement which partially blocks the urethra.
Describe the aetiology of BPH
Age related hormonal changes
What are the risk factors for BPH
Ageing men, smoking, non-Asian race, raised testosterone, family history, castration is protective
Describe the pathophysiology of BPH
Inner transitional zone of prostate proliferates and narrows urethra
What are the key presentations for BPH
LUTS: Storage - frequency, urgency, incontinence, nocturia. Voiding – dysuria, poor/intermittent stream, dribbling, straining, incomplete emptying, hesitancy
What is the gold standard investigation for BPH
Digital rectal exam (smooth, symmetrical but enlarged prostate)
Describe the first line investigations for BPH
Digital rectal exam (smooth but enlarged prostate), prostate-specific antigen (raised), urinary frequency volume chart, urine dipstick (rule out infection)
Other: International prostate symptom score
What are the differential diagnosis for BPH
Prostate cancer, urinary tract infection, prostatitis
Describe the management for BPH
1st line – alpha blockers, e.g., tamsulosin (relaxes smooth muscle in bladder neck and prostate).
2nd line – 5-alpha reductase inhibitors, e.g., finasteride (blocks conversion of testosterone to dihydrotestosterone which decreases prostate size)
Lifestyle – reduce caffeine/alcohol intake
If no response to meds = transurethral resection of prostate (TURP – gold standard)
What are the complications for BPH
Postural hypotension (tamsulosin), sexual dysfunction (reduced testosterone from finasteride), retrograde ejaculation from TURP, UTI
Describe the epidemiology of pyelonephritis
Females
Define pyelonephritis
Upper urinary tract infection. Inflammation of the kidney renal pelvis caused by bacterial infection. Most acquired by ascending transurethral spread. Mostly caused by EPEC – enteropathogenic E. Coli
Describe the aetiology of pyelonephritis
KEEPS infection: klebsiella, enterococcus, E. coli (most common), proteus, s. saprophyticus
What are the risk factors for pyelonephritis
Female (shorter urethra, urethra near anus), urinary stasis (BPH, stones, cancer), vesicoureteral reflux, instrumentation (catheter)
Describe the pathophysiology for pyelonephritis
Pyelonephritis is a complicated UTI as the infection spreads beyond the bladder and urethra to the kidneys and causes damage. Lower UTIs are uncomplicated.
What are the key presentations for pyelonephritis
Triad of loin pain, fever and pyuria (urine WBC). Nausea and vomiting. Urgency, frequency, dysuria, suprapubic pain.
Describe the clinical manifestations for pyelonephritis
Symptoms: Back pain, headache, nausea and vomiting
What is the gold standard investigation for pyelonephritis
Mid-stream urine microscopy and cultures (confirm UTI and identify pathogen)
Describe the first line investigations for pyelonephritis
1st line: Urine dipstick (leucocytes, nitrites, maybe haematuria), FBC (raised WCC, CRP)
Other: urgent USS to detect stones, obstruction, incomplete emptying
What are the differential diagnosis for pyelonephritis
Lower urinary tract infection, cystitis, prostatitis
Describe the management for pyelonephritis
1st line – analgesia, antibiotics (ciprofloxacin, co-amoxiclav)
Describe the complications for pyelonephritis
Renal failure, need for catheterisation, renal parenchyma scarring