PEARLS book Flashcards
the bladder, controlled by a sphincter, contracts to expel urine via the urethra with _______ stimulation
parasympathetic (Ach)
network of capillaries involved in the 1st step of urine formation by filtering the blood
Glomerulus
Receives blood from afferent arteriole and leaves via efferent arteriole
Glomerulus
Crescent shaped structure that receives ultra filtrate from the glomerulus and is the beginning of the neprhon
Bowman’s Capsule
Bowmans capsule + glomerulus =
renal corpuscle
GFR depends on..
age
sex
body size
race
Most active secretion happens in the _____ convoluted tubule
*ie..uric acid, K+, H+, drugs, foreign substances, creatinine, bile salts
DISTAL
removal of substances from blood to be excreted into urine
Secretion
Most reabsorption occurs at the _____ tubule
PROXIMAL
Saturation and Rate of Flow affect…
Reabsorption
Tubular reabsorption of vital substances
Isotonic reabsorption of all organic nutrients (i.e. glucose, AAs), most bicarb, Na, Cl and 75-90% of H20
occurs….?
PROXIMAL convoluted tubule
Passively absorbs H20 but impermeable to sodium and solutes at the _____ DESCENDING Loop of Henle
THIN
Impermeable to H20 but actively reabsorbs Na, K, Cl via Na/K/2Cl co-transporter happens at the ______ ASCENDING Loop of Henle
*loop diuretics work here
THICK
Loop diuretics work on which part of the Loop of Henle?
Thick Ascending
Main job of Distal Convoluted Tubule…
*Thiazisde diuretics work here
Tubular secretion!
*most active secretion occurs here (i.e. acids, toxins, drugs)
Thiazide diuretics work at the…
Distal Convoluted Tubule
Distal tubule determines the final _____ of urine (via Aldosterone and ADH)
OSMOLARITY
Aldosterone causes an increased Sodium…..
reabsorption
ADH does what to the concentration of urine
Increases!
This hormone helps regulate BP by controlling aldosterone secretion
Renin
Controls real blood flow and GFR as well as controls renin release
Juxtaglomerular Apparatus
Juxtaglomerular (JG) cells are specialized smooth cells of _____ arteriole. These cells release renin if low BP
AFFERENT
NaCl sensor found in the distal convoluted tubule
Macula densa
Decreased BP detected by JG cells
Decreased Cl delivery to Macula dense
Increased Beta1 activation
stimulate….
Renin secretion
Kidney disease characterized by:
- Proteinuria
- HYPOalbuminemia
- HYPERlipidemia
- Edema
nephrOtic syndrome
Gold standard dx of NephrOtic Syndrom
24 hour urine protein collection
Urinalysis shows: Proteinuria, Oval fat bodies “maltese cross shaped”*
Also…HYPOalbuminemia, HYPERlipidemia
NephrOtic syndrome
Minimal change dz
Focal segmental glomerulosclerosis
Membranous nephropathy
All can cause primary (idiopathic)..
NephrOtic syndrome
Diabetes**
SLE
Erythematosus
Amyloidosis
All can secondary…
NephrOtic syndrome
Immunologic inflammation of glomeruli causing PROTEIN and RBC leakage into urine**
Acute glomerulonephritis
HTN, hematuria (RBC casts), dependent edema (proteinuria) and azotemia are HALLMARK! for…
Acute glomerulonephritis
Most common cause of Acute glomerulonephritis
IgA nephropathy (Berger Dz)
MC cause of acute glomerulonephritis
*often affects young males within days (24-48H) after URI or GI infection
- diagnosed with IgA deposits
- Tx= ACEi plus corticosteroids
IgA nephropathy (Berger Dz)
- IgA nephropathy (Berger dz)
- Post infectious (i.e. after GABHS)
- Membranoproliferative/ Mesangiocapillary
can all cause…
Acute glomerulonephritis
Rapidly progressive acute glomerulonephritis is associated with what kind of prognosis?
(Goodpasture’s syndrome, Vasculitis)
POOR
Clinical manifestations:
- Hematuria** (hallmark!)
- Edema
- HTN*
- Fevers, abdominal/flank pain
- AKI (oliguria**)
Acute glomerulonephritis
Urinalysis shows Hematuria (RBC casts)**,
dysmorphic RBCs, proteinuria, high specific gravity
Increased BUN and Cr
Acute glomerulonephritis
GOLD STANDARD FOR DX OF ACUTE GLOMERULONEPHRITIS?
RENAL BIOPSY***
Most of the time glomerulonephritis is…
self limiting!
Glomerulonephritis..aka
Nephritic syndrome
Pathophysiology= immune mediated glomerular inflammation leading to glomerular damage and PROTEINURIA AND RBC LOSS**
Nephritis syndrome
Predominant feature of nephrOtic syndrome
Edema
Edema** Increased BUN/Cr transudative pleural effusion** DVTs Frothy urine
Nephrotic or Nephritic?
Nephrotic!
Hematuria, HTN*
Azotemia (increase BUN/Cr)
Oliguria (under 400 ml a day)
Fever, abd, flank pain
Nephrotic or Nephritic?
Nephritic
Hypocellular biopsy..
Nephrotic
HYPERcellular biopsy would be nephritic
Acute tubular necrosis
Acute tubulointerstitial nephritis
Acute glomerulonephritis
Vascular
All causes of what kind of kidney failure?
intrinsic
If not corrected, pre renal failure can lead to….
intrinsic renal failure
Reduced renal perfusion (nephrons structurally in tact!)
Pre renal
autosomal dominant disorder due to mutations in either genes PKD1 or PKD2
*pts usually in 20s-40s
(autosomal recessie type seen in children)
Polycystic kidney dz
Multisystemic progressive disorder characterized by formation and enlargement of kidney cysts in other organs (liver*, spleen, pancreas)
Vasopressin stimulates cystogenesis, leading to end stage renal dz over time
Polycystic kidney dz
- Adbominal/flank pain
- Palpable flank mass
- HTN, hematuria, micro albuminuria
- Extra renal: cerebral “berry” aneurysms**, hepatic cysts, mitral valve prolapse*, colonic diverticula
Polycystic kidney dz
most widely used diagnostic test in Polycystic kidney dz?
Renal ultrasound!**
genetic testing should also be done
Are CTs/MRI more sensitive than ultrasound for polycystic kidney dz?
yes
Treatment for…
Simple cyst: observation, period reevaluation
Multiple cyst: supportive, INCREASE FLUID INTAKE, control HTN, possibly dialysis or renal transplant
Polycystic kidney dz
CKD must be chronic kidney damage for longer than….
3 months
- Proteinuria
- Abnormal urine sediment
- Abnormal urine/serum chemistries
- Abnormal imaging studies
- Inability to buffer pH
- Inability to make urine
- Inability to excrete nitrogenous waste
- Decreased synthesis of Vitamin D/ Erythropoietin
CKD
At risk pts: DM, HTN, chronic NSAID use, ethnic minority, over 60 yo, SLE, post transplanted kidney, am hx kidney dz
*Normal GFR, normal urine
Stage?
Stage 0
Kidney damage with normal GFR (or above 90)
Kidney damage= proteinuria, abnormal UA, serum, imaging
Stage?
Stage 1
GFR 89-60
Stage?
Stage 2
GFR 59-30
Stage?
Stage 3
GFR 29-15
Stage?
Stage 4
GFR under 15
*End stage renal dz (uremia requiring dialysis or transplant)
Stage?
Stage 5
- Diabetes (MC cause!)..due to diabetic nephropathy
- HTN (2nd MC cause)
- Glomerulonephritis
Causes of..
CKD
Single best predictor of CKD progression?
Proteinuria
Renal ultrasound will show what in CKD?
Small kidneys
- HTN control (under 130/80)
- Diabetes control (A1C under 6.5)
- Proteinuria control (ACEI or ARB)
control these for…
CKD management
- Hematologic complications (anemia, coagulopathy)
- Renal osteodystrophy (bone dz)
CKD complications
Periostal erosions, bony cysts on X ray, “salt and pepper” appearance of the skull on X ray
*increased PO4
*HYPOcalcemia
*decreased vitamin D
(PTH increases)
Renal osteodystrophy
non-physiologic excess of increased ADH from pituitary or ectopic source..leads to free water retention and impaired water excretion
- HypoNa
- Kidneys unable to dilute urine
SIADH
MC of euvolemic HypoNa
Causes include:
CNS: stroke, head trauma, meningitis, CNS tumor
Pulm: small cell lung ca
Meds: narcotics, NSAIDs, anticonvulsants, SSRIs
SIADH
MC cause of euvolemic HypoNa
Pts usually only become symptomatic with increased oral free H2O intake
- symptoms of HypoNa
- urine has increased osm (concentrated!)
SIADH
Tx for SIADH
fluid restriction
IV hypertonic saline w furosemide
- hyperosmolarity (increase concen of Na), decreased water
- decreased effective arterial volume (hypovolemia)
stimulate….
ADH
Does hypovolemia always take precedence over hypoosmolarity?
YES
The kidney regulates Na via…
Aldosterone
Aldosterone causes Na retention
Twice the Na concentration roughly equals serum…
Osmolality
90% of bladder cancer is…
Transitional cell
*most present early and respond well to tx
Risk factors... Smokin**** occupational exposure: dyes, rubber, leather age over 40 white males
Bladder cancer
Painless micrscopic or gross hematuria** biggest sign for…
bladder cancer
Cytoscopy with biopsy** gold standard for dx…
bladder cancer
Transurethral resection used for what kind of bladder cancer
localized or superficial
Cystectomy used for what kind of bladder cancer
Invasive (advanced or involving muscular layer)
BCG immune therapy can be used for…
recurrent bladder cancer
95% of tumor originating in the kidney are….
- tumor of proximal convoluted renal tubule cells
- lack of warning signs, variable presentations, resistant to chemo/XRT
renal cell carcinoma
Smoking** dialysis HTN obesity men
risk factors for…
Renal cell carcinoma (RCC)
Classic triad:
- hematuria
- flank/abdominal pain
- palpable mass
(also..L sided varicocele, HTN, HyperCa)
RCC
Diagnosis of RCC made with….
CT scan
If RCC is localized, tx=?
Radical nephrectomy
Nephroblastoma MC children under 5yo
palpable, painless abdominal mass, hematuria, HTN, anemia
Wilm’s tumor
Wilms tumor tx
Nephrectomy followed by chemo
- calcium (increase protein and salt intake)
- uric acid (high protein food)
- struvite (Proteus, klebsiella, pseudomonas)
- cystine (genetic)
stones of nephrolithiasis
Mg ammonium phosphate stones that may form staghorn calculi in renal pelvis
Struvite stones
- Renal colic
- Costovertebral angle tenderness
- Groin pain
Nephrolithiasis
UA= microscopic hematuria, pH under 5 (uric acid or cystine) or pH above 7.2 (struvite)
Nephrolithiasis
MC 1st diagnostic test in nephrolithiasis
noncontrast CT abdomen/pelvis
80% chance of spontaneous passage
tx with opiates and NSAIDs
if stone is less than ___mm
5 mm
Shock wave lithotripsy, uretoscopy, percutaneous nephrolithotomy
may be needed if stone is greater than ___mm
7 mm
E.coli****** Staph saprophyticus (in sexually active women)
most common causes of…
UTIs
greater than 100,000 in clean catch specimen
*urine culture=definitive dx!
UTI
Fluoroquinolones** (Cipro)
Trimethoprim-Sulfamethaxazole
Nitrofurantoin
UTI tx
Hypocalcemia is often associated with..
Hypomagnesemia
Bc magnesium is needed to make PTH