Renal Flashcards

1
Q

How can you prevent calcium stones?

A

This is caused by hypercalcuria hence you can:

  • High fluid intake
  • Add lemon juice to water
  • Avoid carbonated drinks
  • Limit salt intake
  • K citrate may be useful
  • Thiazide diuretics - increases distal tubular ca resorption ***
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2
Q

How can you prevent oxalate stones?

A

cholestyramine reduces urinary oxalate secretion

pyridoxine reduces urinary oxalate secretion

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3
Q

How can you reduce uric acid stones?

A

allopurinol

urinary alkalinization e.g. oral bicarbonate

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4
Q

podocyte fusion and effacement of the podocyte foot processes on renal biopsy

What diagnosis?
Mx?

A

Minimal change disease

mx- oral corticosteroids (80% of cases) -> cyclophosphamide in steroid resistant cases

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5
Q

What does focal segmental glomerulosclerosis cause?

A

cause of nephrotic syndrome and chronic kidney disease

typically presents in younger adults

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6
Q

What are some causes of focal segmental glomerulosclerosis?

A

idiopathic

secondary to other renal pathology e.g. IgA nephropathy, reflux nephropathy

HIV

heroin

Alport’s syndrome

sickle-cell

Also high recurrence rate in renal transplants

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7
Q

What are the main extra-renal manifestations of ADPKD?

A

Liver cysts - 70% most common feature

Berry aneurysms - can rupture -> SAH

CVS - MV prolapse, M / T valve incompetence, aortic root dilatation, aortic dissection

Cysts in other organs - pancreas, spleen
Rarely - thyroid, oesophagus and ovary

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8
Q

In children presenting suspectingly for minimal change disease what is mx?

A

1st line oral pred

If steroid non-responsive, high suspicion of alternative diagnosis or declining renal func (on calcuerin inhibitor) -> renal biopsy

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9
Q

Which immunosuppression can cause tremor?

A

Tacrolimus

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10
Q

Which renal stones are radio-opaque?

A

Calcium oxalate

Mixed calcium oxalate / phosphate

Triple phosphate

Calcium phosphate

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11
Q

Which renal stones are radio-lucent?

A

Urate stones

Xanthine stones

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12
Q

Which renal stones are semi-opaque? what do they look like?

A

Cystine stones - ground glass appearance

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13
Q

Why do you get mineral bone disease in ckd?

A

Basic problems in chronic kidney disease (CKD):
> 1-alpha hydroxylation normally occurs in the kidneys → CKD leads to low vitamin D
> the kidneys normally excrete phosphate → CKD leads to high phosphate

This, in turn, causes other problems:
> the high phosphate level ‘drags’ calcium from the bones, resulting in osteomalacia
> low calcium: due to lack of vitamin D, high phosphate
> secondary hyperparathyroidism: due to low calcium, high phosphate and low vitamin D

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14
Q

How is mineral bone disease risk reduced in CKD?

A

The aim is to reduce PO4 and PTH levels.

reduced dietary intake of phosphate is the first-line management

phosphate binders

vitamin D: alfacalcidol, calcitriol

parathyroidectomy may be needed in some cases

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15
Q

MoA of Spironolactone?

A

Aldosterone antagonist: acts on the cortical collecting ducts as a diuretic via inhibition of mineralocorticoid receptor

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16
Q

What is the most common type of glomerulonephritis in adults? how does this present / biopsy

A

Membranous glomerulonephritis - third most common cause of ESRF

Nephrotic syndrome / proteinuria

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17
Q

What are the causes of membranous glomerulonephritis?

A

idiopathic: due to anti-phospholipase A2 antibodies

infections: hepatitis B, malaria, syphilis

malignancy (in 5-20%): prostate, lung, lymphoma, leukaemia

drugs: gold, penicillamine, NSAIDs

autoimmune diseases: systemic lupus erythematosus (class V disease), thyroiditis, rheumatoid

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18
Q

Young female, hypertension and asymmetric kidneys → what diagnosis?

A

Fibromuscular dysplasia

HTN is secondary to renal artery stenosis (this is the 2nd most common cause after renal vascular disease)

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19
Q

Why does lithium cause DI?

A

Causes nephrogenic DI - densitises kidneys ability to respond to ADH in collecting ducts

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20
Q

Features of Goodpasture syndrome?

A

Goodpastures syndrome = Anti-GBM disease - small vessel vasculitis associated with:

pulmonary haemorrhage

rapidly progressive glomerulonephritis
this typically results in a rapid onset acute kidney injury
nephritis → proteinuria + haematuria

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21
Q

Ix findings in Goodpastures syndrome?

A

renal biopsy: linear IgG deposits along the basement membrane

raised transfer factor secondary to pulmonary haemorrhages

Anti-GBM antibodies

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22
Q

Main mx for rhabdomyolysis?

A

IV fluids

Urinary alkalinization used sometiems

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23
Q

Which drugs to stop in AKI?

A

DAMN

D diuretics
A ace/ arbs + aminoglycosides (eg gent)
M metformin
N nsaids except aspirin at low dose 75mg

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24
Q

What are some adverse effects associated with aldosterone antagonists? how can you reduce this risk?

A

Hyperkalaemia

Gynaecomastia - less common with eplerenone (more selective with less afinity for androgen receptors)

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25
26
Which medication can be used in ADPKD and when?
Tolvaptan (Vasopression receptor 2 antagonist) - slows progression of cyst development + renal insufficiency to be used if: > CKD 2 /3 at start of tx > Evidence of rapidly progressive disease > + company provides it with discount agreed in patient access scheme
27
In hyperkalaemia which medications can be used to remove K from the body?
Calcium resonium (oral / enema) -> enema more effective than oral as K is secreted by rectum Loop diuretics Dialysis - considered in patients w AKI and persistent hyperkalaemia
28
What are the indications for renal replacement therapy in AKI?
The following if refractory to medical mx: 1. Hyperkalaemia 2. Met acidosis 3. Sx or complications of uraemia - pericarditis / encephalopathy 4. severe pulmonary oedema
29
Screening test for ADPKD?
USS Urinary system
30
clinically is characterized by fever, deranged transaminases, leukopenia and thrombocytopenia Important to consider in those with renal transplant recipients Diagnosis? Ix? Mx?
CMV infection Ix - Viral PCR Mx - Ganciclovir
31
Which condition can cause AKI following initiation of ACEi Younger females? Older patients?
Younger females - Fibromuscular dysplasia Older - Atherosclerosis of renal arteries
32
What are the biopsy findings in Amyloidosis?
Congo red stain shows apple-green birefringence under polarised light
33
What are the features of acute interstitial nephritis? What is a common cause?
Sterile pyuria and white cell casts in the setting of rash and fever is suggestive of acute interstitial nephritis - also eosinophilia Commonly due to abx therapy (penicillins , rifampicin, NSAIDs, allopurinol, furosemide)
34
What blood results should have you considering rhabdomyolysis?
Lactic acidosis Hyperkalaemia + features of ATN
35
What are the features of HIV-associated nephropathy (HIVAN)
There are five key features of HIVAN: > massive proteinuria resulting in nephrotic syndrome > normal or large kidneys > focal segmental glomerulosclerosis with focal or global capillary collapse on renal biopsy > elevated urea and creatinine > normotension
36
Alport syndrome - inheritance?
X-linked dominant Man like alport is dominant in the air, got that x factor
37
What is Calciphylaxis? when is it seen? what increases risk of this?
Rare complication of ESRF -> deposition of ca in arterioles -> microvascular occlusion + necrosis of tissue hence presenting with painful necrotic skin leisons Risk is seen with: Hypercalaemia, hyperphosphataemia + hyperparathyroidism Warfarin can cause / exacerbate in high risk patients tx involves reducing levels of this and controlling hyperparathyroidism + avoiding contributing drugs
38
HLA matching for renal transplants which are the most important HLA antigens?
when HLA matching for a renal transplant the relative importance of the HLA antigens are as follows DR > B > A DR Berry Aneurysm
39
Indications for use of spironoloactone?
ascites: patients with cirrhosis develop a secondary hyperaldosteronism. Relatively large doses such as 100 or 200mg are often used hypertension: used in some patients as a NICE 'step 4' treatment heart failure - NYHA III + IV already on ACEi (reduces all cause mortality) nephrotic syndrome Conn's syndrome
40
Most common cause of peritonitis secondary to peritoneal dialysis?
Coagulase -ve staph eg staph epidermis (also staph aureus)
41
What murmur is associated with mitral valve prolapse?
late systolic murmur accompanied by a mid-systolic click
42
What are some possible complications of nephrotic syndrome?
> Increased VTE risk due to loss of antithrombin III and plasminogen - DVT, PE or renal vein thrombosis -> sudden decline in renal func. > hyperlipidaemia - increased risk of ACS + Strokes > CKD > Increased risk of infection due to Ig loss > Hypocalcaemia secondary to Vit D and binding protein loss
43
What electrolyte changes cause nephrogenic DI?
Hypercalcaemia Hypokalaemia
44
RFs for urothelial (transitional cell) caricinoma of bladder?
Smoking Aniline dyes Rubber manufacturing Cyclophosphamide
45
RFs for SCC of bladder?
Smoking Schistosomiasis
46
History of chronic sinusitis, haemoptysis + microscopic haematuria + raised IFMs cANCA +ve What is the diagnosis? what kidney disease does this cause? renal biopsy shows what?
Granulomatosis with polyangiitis (GPA), formerly known as Wegener's granulomatosis Causes rapidly progressive glomerulonephritis - cresenteric glomerulonephritis
47
How can you distinguish between prerenal uraemia and ATN?
Urinary sodium: - Prerenal uraemia -> kidneys respond to reduced perfusion by conserving Na hence low urinary Na - ATN -> kidneys can't reabsorb Na hence high urinary Na
48
When does PSGN and IgA nephropathy develop ?
PSGN develops 1-2 weeks after URTI. IgA nephropathy develops 1-2 days after URTI
49
What are some causes of membranous glomerulonephritis?
Idiopathic: due to anti-phospholipase A2 antibodies infections: hepatitis B, malaria, syphilis malignancy (in 5-20%): prostate, lung, lymphoma, leukaemia drugs: gold, penicillamine, NSAIDs autoimmune diseases: systemic lupus erythematosus (class V disease), thyroiditis, rheumatoid
50
Glomeruli with epithelial crescents are suggestive of?
Rapidly progressive glomerulonephritis
51
Rapidly progressive glomerulonephritis with upper respiratory signs is suggestive of which dx? ab?
Granulomatosis with polyangiitis cANCA ab
52
Mx of choice for HIV associated nephropathy?
Anti-retroviral therapy
53
How to distinguish between typical and atypical HUS?
typical caused by Ecoli - shiga toxin atypical isn't caused by this usually complement dysregulation - can be normal though
54
Definition of AKI?
a rise in serum creatinine of 26 micromol/litre or greater within 48 hours a 50% or greater rise in serum creatinine known or presumed to have occurred within the past 7 days a fall in urine output to less than 0.5 ml/kg/hour (1/2 their weight) for more than 6 hours in adults and more than
55
How long does it take for AV fistula to develop?
6-8 weeks
56
How long before effects of Finasteride for BPH can be seen?
6 months a1 agonists work much faster
57
fever, rash, arthralgia eosinophilia mild renal impairment hypertension Is suggestive of which type of kidney damage?
Acute interstitial nephritis
58
What is Fanconi syndrome? What happens in it?
Fanconi syndrome is a reabsorptive defect in PCT This leads to increased excretion of nearly all amino acids, glucose, bicarbonate and phosphate (T2 Proximal RTA)
59
In a patient with hypercalciuria and renal stones, calcium excretion and stone formation can be decreased by the use of what? eg?
Thiazide diuretics eg indapamide Potassium citrate can also be useful
60
Prevention of oxalate stones?
cholestyramine reduces urinary oxalate secretion pyridoxine reduces urinary oxalate secretion
61
Prevention of Urate stones?
allopurinol urinary alkalinization e.g. oral bicarbonate
62
Respiratory issues + some / all of: HTN, HyperCa and haematuria is suggestive of what?
Renal cell carcinoma can metastasise to lungs
63
What are the different classess of SLE related renal disease?
WHO classification class I: normal kidney class II: mesangial glomerulonephritis class III: focal (and segmental) proliferative glomerulonephritis class IV: diffuse proliferative glomerulonephritis class V: diffuse membranous glomerulonephritis class VI: sclerosing glomerulonephritis Class IV - most common and severe version
64
Young, recurrent UTIs and CKD What is the likely underlying cause? ix?
Reflux nephropathy Ix - Micturating cystography, DMSA scan to check for renal scarring
65
Grading of VUR?
I Reflux into the ureter only, no dilatation II Reflux into the renal pelvis on micturition, no dilatation III Mild/moderate dilatation of the ureter, renal pelvis and calyces IV Dilation of the renal pelvis and calyces with moderate ureteral tortuosity V Gross dilatation of the ureter, pelvis and calyces with ureteral tortuosity
66
Anion gap in RTA?
Normal
67
Epididymo-orchitis abx of choice?
IM ceftriaxone stat + oral doxycycline for 2 weeks
68
Causes of raised anion gap met acidosis?
lactate: shock sepsis hypoxia ketones: diabetic ketoacidosis alcohol urate: renal failure acid poisoning: salicylates, methanol
69
bicalutamide MoA?
non-steroidal anti-androgen blocks the androgen receptor
70
Factors that increase the risk of pulmonary haemorrhage in Goodpastures syndrome (Anti-GBM disease)?
smoking lower respiratory tract infection pulmonary oedema inhalation of hydrocarbons young males
71
Why do patients with chronic kidney disease have a raised phosphate level?
Decreased renal excretion
72
What is thin basement membrane disease?
Inherited disorder of type IV collagen Diagnosis based on persistent haematuria, normal kidney function and fhx of haematuria w/out kidney failure
73
haemoptysis + AKI/proteinuria/haematuria What disorder?
Anti-GBM disease
74
Modification of Diet in Renal Disease (MDRD) equation is a widely used formula to estimate the glomerular filtration rate (eGFR) in patients with chronic kidney disease What variables does it use? What factors can affect the results?
CAGE - Creatinine, Age, Gender, Ethnicity Factors which may affect the result > pregnancy > muscle mass (e.g. amputees, body-builders) > eating red meat 12 hours prior to the sample being taken
75
ABG abnormality in excess 0.9% NaCL use?
Hyperchloraemic metabolic acidosis
76
Contrast-induced nephropathy time frame?
Occurs 2 -5 days after administration
77
Which tumour marker is raised in testicular seminomas?
hCG
78
Causes of nephrogenic DI?
Genetic Electrolytes - hypercalcaemia, hypokalaemia Lithium Demeclocycline tubulo-interstitial disease: obstruction, sickle-cell, pyelonephritis
79
Disorders associated with glomerulonephritis and low serum complement levels?
post-streptococcal glomerulonephritis subacute bacterial endocarditis systemic lupus erythematosus mesangiocapillary glomerulonephritis
80
What is the most likely outcome following the diagnosis of minimal change nephropathy in a 10-year-old male?
Full recovery but 2/3 have relapses - 1/3 frquent and 1/3 infrequent
81
CKD proteinuria ix?
Spot ACR sample the NICE guidelines state 'regard a confirmed ACR of 3 mg/mmol or more as clinically important proteinuria' 'if the initial ACR is between 3 mg/mmol and 70 mg/mmol, this should be confirmed by a subsequent early morning sample. If the initial ACR is 70 mg/mmol or more, a repeat sample need not be tested.'
82
NICE recommendations for referral to a nephrologist for proteinuria when?
a urinary albumin:creatinine ratio (ACR) of 70 mg/mmol or more, unless known to be caused by diabetes and already appropriately treated a urinary ACR of 30 mg/mmol or more, together with persistent haematuria (two out of three dipstick tests show 1+ or more of blood) after exclusion of a urinary tract infection consider referral to a nephrologist for people with an ACR between 3-29 mg/mmol who have persistent haematuria and other risk factors such as a declining eGFR, or cardiovascular disease
83
Subendothelial and mesangial immune deposits resulting in a 'tram-track' appearance renal biopsy findings - dx?
T1 membranoproliferative glomerulonephritis
84
focal segmental glomerulosclerosis with focal or global capillary collapse on renal biopsy Seen in what dx?
HIV nephropathy
84
Thickened basement membrane with subepithelial electron-dense deposits creating a 'spike and dome' appearance dx?
membranous glomerulonephritis
85
Common causes of chronic kidney disease?
diabetic nephropathy chronic glomerulonephritis chronic pyelonephritis hypertension adult polycystic kidney disease
86
Most likely cause of death in CKD with haemodialysis?
most likely cause of death is IHD
87
Diffuse proliferative glomerulonephritis - presentation?
classical post-streptococcal glomerulonephritis in child presents as nephritic syndrome / acute kidney injury most common form of renal disease in SLE
88
Membranoproliferative glomerulonephritis (mesangiocapillary) types?
type 1: cryoglobulinaemia, hepatitis C type 2: partial lipodystrophy
89
Benign prostatic hyperplasia - ethnicity?
Black > white > asian
90
GnRH agonists - what should be given alongside when used in mx of prostate ca?
Lead to lower LH levels long term by causing overstimulation -> -ve feedback initially causes rise in testosterone which can lead to tumour flare Hence need anti-androgen therapy in meanwhile eg cyproterone acetate
91
Stages of diabetic nephropathy?
5 stages - this is for T1DM, T2DM is same but can progress to later stages quicker 1 - hyperfiltration (rise in GFR) ?reversible 2 - silent / latent - most dont develop microalbuminuria for 10 y - can see persistent rise in GFR 3 - incipient nephropathy - microalbuminuria - dipstick -ve 4 - overt neprhropathy - persistne proteinuria >300 albumin and dipstick +ve, HTN in most Histology: diffuse glomerulosclerosis and focal glomerulosclerosis (Kimmelstiel-Wilson nodules) 5 - ESRD <10 GFR, RRT needed
92
Which organ can be dysfunctioning in RCC?
paraneoplastic hepatic dysfunction syndrome (Stauffer syndrom)e - a paraneoplastic disorder associated with renal cell cancer - typically presents as cholestasis/hepatosplenomegaly - it is thought to be secondary to increased levels of IL-6
93
What endocrine effects can RCC have?
may secrete erythropoietin (polycythaemia) parathyroid hormone-related protein (hypercalcaemia), renin ACTH
94
Features and associations of retroperitoneal fibrosis?
Lower back/flank pain is the most common presenting feature. Fever and lower limb oedema is also seen in some patients. Associations - Riedel's thyroiditis - previous radiotherapy - sarcoidosis - inflammatory abdominal aortic aneurysm - drugs: methysergide
95
SLE kidney disease mx in pregnancy
Azathioprine However if this doesnt work consider Ciclosporin but associated w premature delivery and LBW
96
Which BPH med reduces PSA levels?
Finasteride
97
What can increase PSA?
Prostate ca benign prostatic hyperplasia (BPH) prostatitis and urinary tract infection (NICE recommend to postpone the PSA test for at least 6 weeks after treatment) ejaculation (ideally not in the previous 48 hours) vigorous exercise (ideally not in the previous 48 hours) urinary retention instrumentation of the urinary tract
98
Ix of renal artery stenosis?
MR angiography
99
How to distinguish between ATN and acute interstitial nephritis?
Urine dip - ATN = proteinuria minimal haematuria Nephritis = haematuria
100
Mx of HUS?
Largely supportive - Fluids, blood transfusion and dialysis if required No ABX Plasma exchange in rare cases - more often if not associated w diarrhoea + severe HUS Eculizumab C5 inh MAb - better than plasma exchange in adult atypical HUS
101
The cyanide-nitroprusside test - when is it +ve
The cyanide-nitroprusside test +ve = Homocystinuria + cystinuria Differentiation = renal stones in latter
102
Causes of normal anion gap met acidosis?
GI bicarb loss - prolonged diarrhoea, ureterosigmoidoscopy, fistula RTA Drugs eg acetazolamide Ammonium chloride injections Addisons
103
Light microscopy renal biopsy: Mesangium: normal, with no hypercellularity. The capillary walls are thickened. Subepithelial deposits are seen. ('spike and dome' appearance) Suggestive of ? mx?
Membranous glomerulonephritis Mx = ACEi / ARB -> improves prognosis and reduces proteinuria
104
RFs for renal stones?
dehydration hypercalciuria, hyperparathyroidism, hypercalcaemia cystinuria high dietary oxalate renal tubular acidosis medullary sponge kidney, polycystic kidney disease beryllium or cadmium exposure
105
RFs for urate stones?
gout ileostomy: loss of bicarbonate and fluid results in acidic urine, causing the precipitation of uric acid
106
drugs that promote calcium stones?
drugs that promote calcium stones: loop diuretics, steroids, acetazolamide, theophylline
107
Hepcidin in CKD?
CKD -> raised hepcidin due to reduced renall clearance Hepcidin -> preventing iron absorption by blocking the action of ferroportin, a transmembrane protein that maintains iron homeostasis hence reduced iron absorption
108
RFs for contrast nephropathy?prevention?
known renal impairment (especially diabetic nephropathy) age > 70 years dehydration cardiac failure the use of nephrotoxic drugs such as NSAIDs prevent with 1ml/kg/hr for 12hr pre + post procedure + hold metformin 48h before due to risk of lac acidosis
109
Requirements for maintainence fluids per 24h?
Sodium - 1mmol/kg Potassium - 1 mmol/kg Water - 30ml/Kg Glucose - 50-100g
110
Prognosis in IgA nephropathy?
markers of good prognosis: frank haematuria markers of poor prognosis: male gender, proteinuria (especially > 2 g/day), hypertension, smoking, hyperlipidaemia, ACE genotype DD 25% develop ESRF
111
Complications of plasma exchange?
hypocalcaemia: due to the presence of citrate used as an anticoagulant for the extracorporeal system metabolic alkalosis removal of systemic medications coagulation factor depletion immunoglobulin depletion
112
Histology in IgA nephropathy?
mesangial hypercellularity, positive immunofluorescence for IgA & C3
113
urpuric rash on the extensor surfaces of his lower legs. He also has a history of abdominal pain and an urticarial rash Urine dip ++ blood dx? renal biopsy?
HSP aka IgA vasculitis -> mesangial hypercellularity due to the deposition of IgA immune complexes within the mesangium.
114
PLEX indications?
Guillain-Barre syndrome myasthenia gravis Goodpasture's syndrome ANCA positive vasculitis if rapidly progressive renal failure or pulmonary haemorrhage TTP/HUS cryoglobulinaemia hyperviscosity syndrome e.g. secondary to myeloma
115
When is AA and AL amyloidosis seen?
AL - more common - L = light chain seen with myeloma, MGUS + Waldenstroms AA - A = acute phase reactant - seen in chronic infection / inflammation
116
eGFR and CKD stage?
1 Greater than 90 ml/min, with some sign of kidney damage on other tests (if all the kidney tests* are normal, there is no CKD) 2 60-90 ml/min with some sign of kidney damage (if kidney tests* are normal, there is no CKD) 3a 45-59 ml/min, a moderate reduction in kidney function 3b 30-44 ml/min, a moderate reduction in kidney function 4 15-29 ml/min, a severe reduction in kidney function 5 Less than 15 ml/min, established kidney failure - dialysis or a kidney transplant may be needed
117
(patients classically have a loss of subcutaneous tissue from their face), Condition? renal issue?
Partial lipodystrophy Renal - Membranoproliferative glomerulonephritis T2
118
Alcohol bingeing effect on kidneys?
ADH suppression in the posterior pituitary gland subsequently leading to polyuria + raised urinary sodium and reduced urinary osmolality
119