CKD Flashcards
What is the definition of CKD?
Abnormal kidney structure or function, present for > 3 months, with implications for health
What is stage 1 CKD classed as in terms of GFR?
>/= 90 ml/min/1.73m2
What is stage 2 CKD classed as in terms of GFR?
80-89 ml/min/1.73m2
What is stage 3 CKD classed as in terms of GFR?
30-59 ml/min/1.73m2
What is stage 4 CKD classed as in terms of GFR?
15-29 ml/min/1.73m2
What is stage 5 CKD classed as in terms of GFR?
<15 ml/min/1.73m2
What does A1 mean in terms of persistent albuminuria?
<30 mg/g
What does A2 mean in terms of persistent albuminuria?
30-300 mg/g
What does A3 mean in terms of persistent albuminuria?
>300 mg/g
What is Stage 3a CKD defined as in erms of GFR?
45-59 ml/min/1.73m2
What is Stage 3b CKD defined as in erms of GFR?
30-44 ml/min/1.73m2
What are congenital causes of CKD?
- Polycystic kidney disease
- Tuberous sclerosis
- Medullary cystic disease
What vascular problems can cause CKD?
- Hyperensive nephrosclerosis
- Renovascular disease
- Small/medium vessel vasculitis
What secondary glomerular diseases can cause CKD?
- SLE
- Polyangiitis
- Wegener’s
- Amyloidosis
- Diabetic nephropathy
- HUS
- TTP
- Systemic sclerosis
- Sickle cell disease
What tubulointerstitial diseases can cause CKD?
- Tubulointerstitial nephritis
- Reflux nephropathy
- TB
- Schistosomiasis
- Nephrocalcinosis
- Multiple myeloma
- Renal papillary necrosis
What causes of urinary tract obstruction can lead to CKD?
- Calculi
- Prostatic disease
- Pelvic Tumours
- Retroperitoneal fibrosis
- Schistosomiasis
What are symptoms which can occur in CKD?
Most are asymptomatic, but in more severe disease - symptoms of uraemia and kidney dysfunction:
- Malaise
- Loss of appetite/anorexia
- Insomnia
- Itching
- Nausea/vomiting/diarrhoea
- Paraesthesiae/Tetany
- Bone pain
- Symptoms of anaemia
- Oedema
- Amenorrhoea
- Erectile dysfunction
- Severe dysfunction - Mental slowing, seizures, Myoclonic twitching
What are peripheral signs of CKD?
- Peripheral oedema
- Signs of PVD
- Vasculitic rash
- Gouty tophi
- Signs of immunosuppression - bruising easily, skin malignancy
- Asterixis
What signs might you see in the face in someone with CKD?
- Anaemia
- Xanthelasma
- Uraemic (yellow) tinge
- Jaundice - HRS
- Gum hypertrophy
- Cushingoid appearence
- Periorbital oedema - nephrotic syndrome
- Telangiectasia - scleroderma
What signs might you see in the neck in someone with CKD?
- Increased JVP
- Lymphadenopathy
- Scar from parathyroidectomy
What cardiovascular signs might you see in someone with CKD?
- HTN
- Sternotomy scar
- Cardiomegaly
- Stigmata of endocarditis
What respiratory signs might you see someone with CKD?
Pulmonary oedema/effusion
What signs might you see on the abdomen in someone with CKD?
- PD catheter
- Signs of previous transplant
- Ballotable polycystic kidney +/- palpable liver
What investigations might you do in someone who you suspected had CKD in an attempt to identify a cause?
- Bedside - BP, Urine dipstick
- Bloods - U+E’s, FBC, Ca2+, PO43-, PTH, LFT, ESR, Glucose, CK
- Imaging - Renal USS
- Other - Renal biopsy, Urine MC+S, Urine PCR, blood film
Why might you do a blood glucose in someone who is suspected to have CKD?
Look for diabetes as a cause of renal failure
What blood tests might show that someone with CKD is developing renal osteodystrophy?
- Decreased Ca2+
- Increased PO43-
- Increased PTH
What bloods test would you consider doing to look for signs of intrinsic renal disease?
- ANA
- ANCA
- Antiphospholipid antibodies
- Paraprotein
- Complement
- Anti-GBM
- Hepatitis serology
- Cryoglobin
What might you see on urine dipstick in someone with CKD?
- Haematuria - GN
- Proteinura
- Glycosuria
- White cells
What might you see on Urine electrophoresis in someone with CKD?
Bence-Jones Proteins
What might you see when measuring urine osmolality in someone with CKD?
Low urine osmolality - inability of kidneys to concentrate urine
What is renal osteodystrophy?
Bone mineral disorder
Embraces the various forms of bone disease that may develop alone or in combination in CKD – hyperparathyroid bone disease, osteomalacia, osteoporosis, osteosclerosis and adynamic bone disease
How would you monitor renal function in CKD?
Annual measurements of:
- GFR
- Albuminuria
What are risk factors for decline in renal function?
- Hypertension
- DM
- Metabolic disturbance
- Volume depletion
- Infection
- NSAIDs
- SMoking
What might a markedly raised ESR indicate as the cause of CKD?
Myeloma or vasculitis as a cuase of CKD
What might fragmented RBCs +/- thrombocytopenia on blood film in someone with CKD indicate as the potential cause of CKD?
Haemolytic causes
- HUS
- TTP
- Accelerated hypertension
What might an elevated CK indicate as the cause of CKD?
Rhabdomyolysis
What are the main aspects of CKD management?
- Slow disease progression
- Treat complications - renal and other
- Consider preparation for RRT
How would you treat someone with CKD to slow disease progression?
- BP management
- Tight glycaemic control
- Exercise
- Weight loss
- Smoking cessation
- Reduce salt intake
What is the general target BP aimed for when trying to control BP in someone with CKD?
<140/90 mmHg
If someone had DM with CKD, what BP would you aim for when trying to control BP as management of CKD?
<130/80
When would you consider using ACEi/ARBs in managing CKD?
- DM and A:CR ratio > 3mg/mmol
- Hypertension and A:CR ratio > 30mg/mmol
- Any CKD with A:CR ratio >70 mg/mmol
What is the risk of use ACEi/ARBs in someone with CKD?
Hyperkalaemia
In those with DM and CKD, what is the target HbA1c aimed for?
<53 mmol/mol
What factors contribute to anaemia in CKD?
- Erythropoeitin deficiency
- Bone marrow toxins
- Bone marrow fibrosis 2o to HPTH
- Haematinic deficiency
- Increased haemolysis
- Increased blood loss - GI, blood sampling, HD
- ACEi use
How would you manage anaemia in someone with CKD?
- Treat deficiencies - Iron, B12, folate
- Look for signs of blood loss
- EPO - if Hb < 110 g/l
What are complications of CKD?
- Hyperkalaemia
- Anaemia
- Metabolic Acidosis
- Renal bone mineral disease
- Pruritis
- Gout
- Nephrogenic systemic fibrosis
- Endocrine abnormalities
- Severe uraemia
- Restless legs/cramps
- Calciphylaxis
- Pericarditis
- CVS disease
How would you manage acidosis in someone with CKD?
Consider sodium bicarbonate supplements with eGFR < 30 and bicarb < 20 mmol/L
How would you manage oedema in someone with CKD?
- Restrict fluid intake
- Restrict sodium intake
- Consider High doses loop + thiazide diuretics
Why does vitamin D synthesis reduce with increasing kidney dysfunction?
Kidney loses its ability to hydroxylate Vit D in the kidney
How would you manage CKD related bone-mineral disorders?
- Dietary phosphate restriction and phosphate binders
- VIt D supplements
Why do those with CKD develop secondary hyperparathyroidism?
- Decreased renal production of the 1α-hydroxylase enzyme -> reduced conversion of 25-(OH)2D3 to 1,25-(OH)2D3.
- Reduced activation of vitamin D receptors (VDR) in the parathyroid glands -> increased release of PTH
- Calcium sensing receptors (CaR), expressed in the parathyroid glands, react rapidly to acute changes in extracellular calcium -> a low calcium leads to increased release of PTH.
What dietary advice would you want to give someone with CKD?
- Potassium restriction if hyperkalaemic
- Phosphate restriction if hyperphosphataemic
How would you manage cardiovascular risk in someone with CKD?
- Antiplatelets
- Atorvastatin
- Consider ACEi in hypertension
- Lifestyle advice - smoking, diet, alcohol, exercise
What drugs are particularly important to check before prescribing in CKD?
- Aminoglycosides
- Penicillins
- Cephalosporins
- Heparin
- Lithium
- Opiates
- Digoxin
What mnemonic could you use to remember the features of CKD?
RESIN + 8 P’s
- Retinopathy
- Excoriations (scratch marks)
- Skin is yellow
- Increased blood pressure
- Nails are brown
- Pallor
- Purpura and bruises
- Pericarditis and cardiomegaly
- Pleural effusions
- Pulmonary oedema
- Peripheral oedema
- Proximal myopathy
- Peripheral neuropathy