The kidney in systemic disease Flashcards
What are the haemodynamic changes seen with dibaetic nephropathy initially?
afferent arteriolar vasodilation mediated by a range of vaso-active mediators–hyperfiltration–increased GFR
What happens in response to the hyperfiltration in the kidney?
renal hypertrophy
What happens in renal hypertrophy?
plasma glucose stimualtes growth factors within the kidney leading to mesnagial expansion, nodule formation of diffuse glomerulosclerosis; tubulointerstital fibrosis
What causes proteinuria in diabetic nephroapthy?
GBM thickening and podocyte dysfunction
What is the name of mesangial nodules in diabetic nephropathy?
Kimmelstiel-Wilson lesions
What is the management of diabetic nephropathy?
tight glycaemic control; tight BP control (<130/80); statins; ACEi
What is the problem with peritoneal dialysis in diabetic patients?
can mess up gycaemic control
What is one of the main reasons that diabetic survival on dialysis is so poor?
once a diabetic patient gets to ESRF they have a very high CVS risk
What is ischaemic nephropathy?
reduced GFR associated with reduced renal blood flow beyond the level of autoregulatory compensation
What does long periods of ischaemic nephropathy lead to?
renal atrophy and progressive CKD
What are the renovascular causes of secondary HT?
atherosclerotic renal artery stenosis and fibromuscular dysplasia
Why does renal artery stenosis and fibromuscular dysplasia cause seondary HT?
a reduction in renal perfusion activates a reponseto increase systemic arterial BP
Who gets renal artery stenosis?
> 50s; males; risk factors for generalised atherosclerosis
What is the presentation of renal artery stenosis?
AKI after treatment of HT- usually with ACEi; flash pulmonary oedema; renal bruit; discrepancy in kidney size (as renal artery stenosis is usually unilateral)
What is the treatmnet for renal artery stenosis?
statins; anti-platelets and ACEi