Renal Flashcards
Risk factors for kidney cancer?
Smoking Renal failure and dialysis Obesity Hypertension Von Hippel-lindau syndrome(50% develop RCC)
How does the low pressure side of the CVR system respond to high and low pressure?
Low pressure -> reduced baroreceptor finding -> signalling to CNS (medulla) -> increase sympathetic activity (and ADH release)
High pressure -> more Atrial stretch ->ANP, BNP released
How can the body decrease sodium reabsorption?
- Via Atrial natriuretic peptide
2. Via a decrease in B1-sympathetic activity. Thus decreased activation of RAAS
describe the lymphatic drainage of the prostate
obturator nodes -> internal iliac chain.
OAB is a syndrome of?
Frequency, urgency, nocturia with or without leak
State the signs and symptoms of hypoaldosteronism
ECF volume decreases
increased renin, Ang II and ADH :
- low blood pressure
- dizziness
- salt craving
- palpitation
in what setting do ACE inhibitors need to be paused as they can worsen GFR? how does it cause this?
in an acutely unwell patient
reduces perfusion pressure in the glomerulus
how do you treat urge incontinence?
Decrease caffeine, stop smoking, lose weight
Bladder retraining, pelvic floor muscle exercises
Drugs to promote detrusor muscle relaxation:
- Anticholinergics/antimuscarinics - solifenacin, tolterodine, trospium
- Beta-3-agonists - betmiga
How do carbonic anhydrase inhibitors work?
- Reduced production of carbonic acid
- Thus reduced production of H+
- Reduction in exchange of H+ for Na+
- Reduced Na+ reuptake in the PCT
- Increased Na+ in distal nephron
- Reduced water reabsorption
How do osmotic diuretics work?
Don’t get reabsorbed
Increases osmolarity in PCT -> less water reabsorbed
Intravenous fluid or oral fluid first enters the __ and then enters the __ compartment
ECF then equilibrates with ICF
ADH promotes water reabsorption from ___ __ of kidney
Collecting duct
Binds to V2 Receptor -> AQP2 inserted apical and AQP3 into basolateral membrane
What are the consequences of salt and water retention in kidney failure?
hypertension, HF, pulmonary oedema
What protein does ADH affect to alter water reabsorption?
aquaporins
why is there high blood pressure in Liddle’s Syndrome?
- Mutation in aldosterone activated sodium channel (ENAC)
- Channel is always “on” -> sodium retention = water retention
- aldosterone is normal or low *
in a 59 year old man, what would be first line treatment for hypertension?
Which other group of people have this as first line?
Aged >55 = Amlodipine. (CCB)
African Americans
How do kidneys typically appear on ultrasound in acute renal failure with no obstruction?
normal size
How can the body retain sodium & water
- Sympathetic activity:
- stimulates sodium uptake by cells of PCT
- makes smooth muscle cells of afferent arteriole (AA) contract.
- Stimulates cells of JGA to secrete Renin. resulting angiotensin II makes PCT take up sodium and resulting aldosterone makes DCT and CT take up sodium - low tubular Na+ stimulates renin production by JGA
risk factors for bladder cancer?
Smoking
Occupational exposure (aromatic hydrocarbons) e.g. working with dyes
Chronic inflammation of bladder (bladder stones, schistosomiasis, long term catheter)
Drugs (cyclophosphamide)
Radiotherapy
what are the symptoms of metabolic acidosis seen in kidney failure?
Anorexia
Muscle catabolism
A patient suffering from hepatic cirrhosis will have a ___ urine osmolarity
high
leakage associated with urinary retention is?
overflow incontinence
A respiratory Acid-base disorder is determined by looking at _ levels
PCO2
state 4 conditions patients are at risk of post kidney transplantation
Diabetes
Cardiovascular disorders
Cancer
Psychiatric disorders
Post prostatectomy, a PSA of ____indicates a relapse
> 0.2
risk factors for urine incontinence?
Increasing age Drugs e.g. ACE inhibitors Pregnancy and vaginal delivery Smoking Obesity Family history Constipation prolapse/hysterectomy/menopause
Mr. Holmes is being treated with a loop diuretic and Mr Smith with a thiazide diuretic for the past 3 weeks. Both individuals are drinking insufficient amount of water. Whose urine will have a lower osmolarity and why?
Mr. Holmes - because loop diuretics act on loop of Henle whilst thiazide diuretics act on distal convoluted tubule.
risk factors for prostate cancer?
Increasing age
Western nations (scandinavian countries)
African americans
The excretion of which major ions/molecules is altered to correct volume expansion and how is it affected?
Sodium and water
Their reabsorption is reduced
What is the mechanism/3 causative theories for stress incontinence in men?
Sphincter incompetence
Reduction in urethral sphincter length
Postoperative stricture
why might a patients use of trimethoprim invalidate the GFR calculator?
Trimethoprim inhibits active secretion of creatinine, causing creatinine to rise.
GFR may not have actually changed but you need further tests to know for sure
what tests are carried out for BPH?
Digital rectal exam
Urine test - rule out infection/other causes
PSA - will be elevated in BPH
Flow rate + PVR
State 5 causes of hyperkalemia
- K+ sparing diuretics
- ACE inhibitors
- Elderly
- Severe diabetes
- Kidney disease
state 3 types of acute renal failure and their pathophysiology
- Prerenal - insufficient blood flow to kidneys e.g. hypovolemia
- Intrinsic renal failure - filtration problem e.g tubulointerstitial disorders
- Postrenal - bilateral outflow obstruction
the complaint of an involuntary leakage of urine associated with urgency and also with exertion, effort, sneezing or coughing is?
mixed urinary incontinence
What is the main intracellular ion? (it is low in extracellular fluid)
K+
PISO -Potassium inside and sodium outside
how do you manage CKD?
Initial -> Correct fluid balance - if hypo give fluids, if hyper give diuretic/dialysis
Initial -> Reverse hyperkalemia:
Drive into cells - sodium bicarb or insulin dextrose
Drive out of body - diuretics/ dialysis
Gut absorption - potassium binders
Long term - hemodialysis or peritoneal dialysis at home OR in centre hemodialysis
Kidney transplant
advantages of peritoneal dialysis
Less food and water constraints
Can travel easily
In what parts of the nephron is K+ secreted?
DCT and Collecting duct
Only reabsorbed in these regions if you are K+ depleted
State 4 things that stimulate potassium secretion in the nephron?
- High plasma K+ (more K+ enters cell via Na/K+ ATPase and leaves via lumen)
- high plasma pH
- Increase in tubular flow rate
- Increase in aldosterone
What is the most prevalent and important solute in the ECF?
sodium
Incidence of prostate cancer is _____ but mortality rates ____
rising
declining
the complaint of an involuntary leakage accompanied by or immediately preceded by urgency is?
urge incontinence
What part of the nephron would a diuretic drug that inhibits the activity of an enzyme found predominantly in the endothelial cells of the lung work?
Whole renal tubular system except in loop of henle
Due to lack of angiotensin II AND Aldosterone
A metabolic Acid-base disorder is determined by looking at _ levels
HCO3-
what are some differential diagnosis for urge incontinence?
UTI DO Urethral syndrome Urethral divertivulum Interstitial cystitis Bladder cancer Large residual volume
How does the high pressure side of the CVR respond to low pressure?
Low pressure -> reduced baroreceptor firing -> signalling to brainstem -> sympathetic activity and ADH release
Low pressure -> reduced baroreceptor firing -> JGA cells -> renin release
___ have a higher prevalence of OAB-wet and ___ have a higher prevalence of OAB-dry
women
men
function of prostate
liquify ejaculate
prostate cancer investigations?
PSA (not prostate-cancer specific but prostate specific). Can be elevated in UTI, prostatitis
MRI
Trans perineal prostate biopsy
If a kidney leaks contrast up into it on an Xray, it means that it is __
faulty
continuous leakage is?
continous incontinence
what does conservative treatment of CKD involve?
erythropoietin injections to correct anaemia diuretics to correct salt water overload phosphate binders 1.25 vit d supplements symptom management
clinical features of bladder cancer?
PAINLESS haematuria or persistent microscopic haematuria
Suprapubic pain
Lower urinary tract symptoms e.g. increased frequency
Metastatic disease - bone pain, lower limb swelling
what are some symptoms of AKI?
Decreased urine output, although occasionally urine output remains normal
Fluid retention, causing swelling in your legs, ankles or feet
Shortness of breath
Fatigue Confusion Nausea Weakness Irregular heartbeat Chest pain or pressure
Seizures or coma in severe cases
Incidence and mortality of bladder cancer in UK is ___
declining
the complaint of loss of urine during sleep is?
nocturnal enuresis
What is spironolactone used for and what is its mechanism?
- Can be used to treat hypertension (not first-line)
- It is an aldosterone receptor blocker in the DCT
what causes BPH
↑ number of epithelial and stromal cells in the periurethral area of the prostate in response to androgens (testosterone)
treatments for stress incontinence?
weight loss, kegel exercises, cessation of smoking
oestrogen therapy if evidence of atrophy
Surgery - occlusion, supportive e.g. mid-urethral sling, ileal conduit diversion