SAQ book Flashcards
CKD Stages: (Based on egfr)
Stage 1: Above 90 Egfr
Stage 2: 60-89
Stage 3a: 45-59
Stage 3b: 30-44
Stage 4: 15-29 (Usually only symptomatic from Stage 4 onwards)
Other than Diabetes, 4 common causes of CKD?
- Hypertension
- Glomerulonephritis
- Pyelonephritis
- Polycystic kidney disease
- Obstructive uropathy
Why is a renal ultrasound arranged in CKD?
- To assess renal size, exclude polycystic kidneys, and exclude obstruction
Medication to add if diabetic and in CKD?
ACE-I (eg. Ramipril is protective)
2 common side effects of ACE-i?
- Dry cough
- AKI
- Urticaria
- hyperkalaemia
- first dose hypotension
2 other blood tests that are important to check regularly in CKD?
PTH
FBC
Calcium
Alkaline Phosphatase
Phosphate
Complications of CKD?
-Anaemia
-Renal osteodystrophy
NB: CKD mx: often requires lowering dose of drug= Gentamicin and Digoxin
- CKD patients are prone to developing Hyperkalaemia= give low potassium diet for all patients.
3 signs of CKD could find on examination?
-Pallor
- purpura
- uraemic tinge
- brown discolouration of nails
-peripheral oedema
Pericardial rub
- pleural effusion evidence
- Tenckhoff catheter (evidence of preparation for renal replacement therapy)
- Proximal Myopathy
Explain basic principles of haemodialysis?
- Blood and dialysis fluid flow either side of a semipermeable membrane.
- Molecules diffuse DOWN their concentration gradient
- Plasma biochemistry changes to become more like the dialysis fluid.
2 complications of Peritoneal Dialysis?
- Bacterial/Sclerosing Peritonitis
- Location infection at catheter site
- Constipation
- failure
what time period determines if organ rejection after renal transplant is acute or chronic?
6 months
why is there a need to be seen by a dermatologist after a renal transplant?
- increased risk of squamous cell carcinoma (due to the long-term immunosuppression)
-Renal replacement therapy: is started when egfr is less than 15+symptomatic. Options:
1)Haemodialysis (involves formation of AV fistula- blood and dialysis fluid flows in opposite directions)
2)Peritoneal Dialysis (tenckhoff catheter- dialysis fluid is introduced into peritoneal cavity
3) Renal transplant: can be from donors: brainstem dead, non-heart beating, living related, living unrelated. Patients must be ABO incompatible with donor. Lifetime immuno-suppression is needed after this.
What form of Hyperparathyroidism has Low calcium and high PTH?
Secondary Hyperparathyroidism (high PTH and low Ca)
give 2 actions of PTH
1) Increase osteoclast activity (results in increased calcium and phosphate released from bone)
2) Increase Calcium and Phosphate Reabsorption via kidney
3) increased hydroxylation of Vit D
At what 2 sites does Hydroxylation of Vit d occur?
- Liver
- Kidney
What term is given to bone disease in patients with renal failure
Renal Osteodystrophy
2 ways to manage Secondary Hyperparathyroidism
- Calcium supplements
- Vitamin D analogues (eg. calcipotriol)
- Restrict dietary phosphates
Tertiary Hyperparathyroidism: levels of calcium and PTH?
Calcium: high
PTH: High
NB: Both is high like Primary Hyperparathyroidism
Reason for why tertiary hyperparathyroidism can develop from secondary?
- Prolonged Tertiary Hyperparathyroidism= causes parathyroid gland to act autonomously (causes hyperplastic change)
NB: in CKD: there is reduced production of erythropoeitin= causing anaemia, therefore treat with Erythropoeitin injections
how can AKI be subclassified?
3 types:
1) pre-renal
2) renal
3) post-renal
2 causes of each type of AKI?
Pre-renal: (dehydration)
1) Hypovolaemia
2) sepsis
3) congestive heart failure
Renal: (intrinsic)
1) Acute tubular necrosis
2)Glomerulonephritis
3) rhabdomyolysis
4) haemolytic uraemic syndrome
5) Pre-eclampsia
6) malignant hypertension
Post-renal: (obstruction)
1)renal calculi
2)ureteric tumours
3) BPH
4) Prostate cancer
triad of conditions in haemolytic uraemic syndrome?
1) AKI
2) haemolytic anaemia
3) thrombocytopenia (LOW platelets)
Other inv. to request in AKI except blood tests?
- Renal USS: to rapidly rule out an obstruction
- CXR
- ECG
- ABG
- Urinalysis
NB: Mx of AKI= is by treatment of underlying cause.
2 potentially life-threatening complications of AKI?
- Pulmonary oedema
- Hyperkalaemia
- Haemorrhage
give 2 indications for dialysis in a patient with AKI?
1) Uraemic (either encephalopathy or pericarditis)- uraemia would present with confusion
2) Refractory: Pulmonary oedema/ Hyperkalaemia
Reason for AKI if urine is brown, collapsed on floor for ages?
Rhabdomyolysis= Following prolonged immobility
- Mechanism that causes this: Acute Tubular Necrosis
what blood test would be raised in Rhabdomyolysis?
Creatinine Kinase
What urine test would you request to confirm the diagnosis?
Urinary Myoglobin
What may be seen on urine microscopy?
Muddy brown/granular casts
Which medications would you hold on admission in a person with Rhabdomyolysis?
- metformin- as there is a risk of metabolic acidosis
- lisinopril- is nephrotoxic
Other than prolonged immobility, give 3 causes of Rhabdomyolysis?
- Excessive exercise
- Crush injuries
- Burns
- Seizures
- Neuroleptic malignant syndrome
- Drugs: Heroin, Ecstasy, Statin
3 ECG changes seen in Hyperkalaemia?
(Everything big)
- Tall tented T waves
- Widening of QRS complex
- Flat P waves
Initial treatment for Hyperkalaemia?
- IV Insulin+Dextrose
- Salbutamol Nebulisers
- 10% Calcium Gluconate 10mL over 5 mins (if K+ is more than 7= to protect the myocardium of the heart)
- if hyperkalaemia still remains= Needs Dialysis
What blood tests should you request urgently: for rapidly progressive Glomerulonephritis? (urine shows: positive for blood and protein)
- ANCA
- Anti-GBM
what medication should be started immediately in rapidly progressive Glomerulonephritis?
Steroids
Further inv. to confirm Wegener’s Granulomatosis (Granulomatosis with Polyangitis)
Renal biopsy
NB: about condition: is autoimmune affecting: upper and lower resp. tract+ Kidney
-cANCA
- Renal biopsy: will show Epithelial crescents in Bowman’s capsule.
Define nephrotic syndrome
Triad:
1) Proteinuria (more than 3)
2) Hypoalbuminaemia (less than 30)
3) Oedema
Presentation could be: leg swelling that is worse when standing and walking, resolved when lying flat, + no SOB (as ddx: Heart failure)
Most common cause of nephrotic syndrome in - children - adults?
- Children: Minimal Change Disease
- Adults: Membranous Nephropathy/Glomerulonephritis (Mx: ACE-i/ ARB)
- Elderly: Focal Segmental Glomerulosclerosis
What inv. will give definitive diagnosis for Nephrotic Syndrome?
Renal Biopsy (Almost always the definitive diagnosis)
2 complications of nephrotic syndrome?
- Increased susceptibility to infections
- increased risk of thromboembolism
- hyperlipidaemia
One measure to manage complication of nephrotic syndrome?
- infection: prompt abx. treatment, pneumococcal vaccination
- thromboembolism: avoid prolonged bed rest, and consider anticoagulation
- hyperlipidaemia: treat with statin
2 pieces of Dietary advice: for a patient with nephrotic syndrome?
- Restrict salt intake
- Normal protein intake
serum osmolality formula?
2*Na+urea+glucose
clinical obs. and inv: to determine volume status and cause of hyponatraemia?
- examine for peripheral oedema
- examine jvp
- postural blood pressure
- measure urine output
- cxr: signs of heart failure/pulmonary oedema