CKD Flashcards
what is the most common kidney disease in dogs and cats?
CKD
is CKD more prevalent in dogs or cats?
3 x more prevalent in cats
what is the definition of CKD?
functional and/or structural disease of the kidneys of >3 months duration
what is the result of CKD?
gradual, progressive and irreversible nephron loss leading to reduced ability to filter toxins from the body
what can therapeutic intervention do for CKD patients?
help slow disease progression
prolong good quality of life
what is the aim of CKD management?
reducing workload of remaining nephrons
prevention of further kidney damage
what level of nephron loss is there with normal kidney function?
none-50% loss
what disease signs are seen with 50% nephron loss?
none - disease still subclinical
what what level of nephron loss do kidneys loose urine concentrating ability?
67%
what happens to the kidneys at 67% nephron loss?
lose concentrating ability
what USG is seen in cats once they reach 67% nephron loss?
<1.035
what USG is seen in dogs once they reach 67% nephron loss?
<1.030
what happens to the kidneys at 75%% nephron loss?
become azotemic and clinical signs seen
at what level of nephron loss are clinical signs and azotemia seen?
75%
what happens between 75 and 100% nephron loss?
decreasing quality of life which then becomes incompatible with life
what are the majority of CKD cases caused by?
chronic interstitial nephritis
what is chronic interstitial nephritis?
inflammation of renal interstitium
what should be excluded when diagnosing CKD?
treatable or partially reversible causes
what are the main treatable/reversible causes of CKD?
pyelonephritis
ureterolithiosis
what may CKD be caused by other than chronic interstitial nephritis?
an asymptomatic or undiagnosed initial insult which leads to a reduction in glomerular filtration rate
what is pyelonephritis?
inflammation of kidney and renal pelvis with infectious cause (e.g. FIP/FIV)
how does ureterolithiasis cause kidney injury?
post renal obstruction but causes damage as waste products back up into kidney
what is caused by reduction in glomerular filtration rate?
compensatory hypertrophy of remaining nephrons which over time leads to progressive nephron loss as the process is damaging
overall reduction in GFR
is compensatory hypertrophy of nephrons effective?
initially yes - individual nephrons can increase GFR.
Over time this is damaging
what are the main consequences of CKD?
loss of water/electrolyte regulation
loss of acid/base regulation
failed excretion of uraemic solutes
impaired renal hormone synthesis
hypertension
what are the clinical manifestations of loss of water/electrolyte regulation due to CKD?
PUPD
dehydration
hypokalaemia
what are the clinical manifestations of loss of acid/base regulation due to CKD?
acidaemia leading to nausea, vomiting, dehydration and inappetance
what are the clinical manifestations of failed excretion of uraemic solutes due to CKD?
azotemia
hyperphosphataemia
what is caused by hyperphosphataemia?
nausea
vomiting
dehydration
inappetance
renal secondary hyperparathyroidism
what are the clinical manifestations of impaired renal hormone synthesis due to CKD?
lack of erythropoetin (EPO)
anaemia
what are the clinical manifestations of hypertension due to CKD?
end organ damage
what age of patient is affected by CKD?
increasing incidence with age
<1 year old may be affected
what patients are typically affected by CKD?
mature-geriatric cats
what is the usual cause of patients under 1 year being affected by CKD?
congenital disorders e.g. malformation or polycystic kidneys
how long will signs of CKD last for?
weeks to months
when may CKD be identified?
long term signs
incidental diagnosis in subclinical phase
how may CKD be diagnosed in the subclinical phase?
pre-op sceening profiles
geriatric wellness screening bloods and urinalysis
what should be discussed with an owner when taking patient history if CKD is suspected?
weight or condition changes
drinking and urination (PUPD)
appetite changes
change to demenour or activity levels
any GI signs
signs associated with hypertension
ease of medication administration
what GI signs may be seen with CKD?
vomiting
diarrhoea
haematemesis
melaena
constipation secondary to dehydration
what should you assess about a patient with suspected CKD?
hydration status
weakness
presence or uraemic ulcers/uraemic halitosis
hypertensive retinopathy
palpation of kidneys
presence of rubber jaw
what signs may suggest weakness in CKD patients?
neck ventroflexion
what is neck ventroflexion in CKD patients caused by?
hypokalaemic myopathy
how may kidneys appear on palpation if the patient has CKD?
small and irregular
what is rubber jaw caused by?
renal secondary hyperparathyroidism
how is CKD diagnosed?
combination of diagnostic tools and functional tests
what tests are used to diagnose CKD?
USG
urine protein:creatinine ratio
serum creatinine and urea
GFR
symmetric dimethylarginine (SDMA)
imaging (xray or US)
what is the earliest indication of CKD?
weight loss
reduction in urine concentration
what is the most sensitive test for CKD?
GFR
at what level of nephron loss is azotemia seen?
75%
what is azotemia?
increased blood urea and creatinine