CHRONIC KIDNEY DISEASE (CKD) 3RD OCTOBER 2019 kidney... · 2019. 10. 15. · one cause of kidney...
Transcript of CHRONIC KIDNEY DISEASE (CKD) 3RD OCTOBER 2019 kidney... · 2019. 10. 15. · one cause of kidney...
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CHRONIC KIDNEY DISEASE (CKD) 3RD OCTOBER 2019 ANDREA FOX – TEACHER, UNIVERSITY OF SHEFFIELD
WILL HAMILTON– RENAL PATIENT
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ThinkKidneys/Ipsos MORI 2014
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ANATOMY OF THE KIDNEY
• Situated in the middle of the back,
just below ribcage, either side of the
spine.
• Bean shaped, about the size of your
fist.
• Receive about 25% of the blood
pumped by the heart.
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NEPHRON
• Nephron is the functioning unit of the
kidney.
• Approx. one million in each kidney.
• Processes involved in urine formation
are filtration, reabsorption and
secretion.
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EFFECTS OF AGEING ON THE KIDNEYS
• Kidney function reduces as we age, from
about the age of 40
• Smaller and lighter
• Reduction in surface area of glomeruli
• Thickening of glomerular basement membrane
• Cardiac output decreases affecting perfusion
• Older kidneys less sensitive to ADH
• Renin production decreases
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WHAT IS CHRONIC KIDNEY DISEASE (CKD)?
• CKD – gradual decline in kidney function over months or years
• Kidney function deteriorates naturally from the age of 40!
• Do elderly have CKD or just normal age-related deterioration?
• CKD is not a diagnosis in itself – indicator of how well the kidneys are working
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MEASURING RENAL FUNCTION
• Glomerular Filtration Rate (GFR) is best indicator of kidney function
• eGFR measured using estimation formulae GFR Estimator
• Not entirely reliable
• A low eGFR rarely leads to clinically significant renal disease. (Lewis 2009)
• Low eGFR greater indicator for CVD
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CKD STRONGLY ASSOCIATED WITH CVD
US Renal Data System report (2011)
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CLASSIFICATION OF CKD
Stages of Kidney disease
Stage Description GFR mL/min/1.73m2
1 Kidney damage with normal or ↑GFR ≥90
2 Kidney damage with mild ↓GFR 60-89
3A Moderate ↓GFR 45-59
3B Moderate ↓GFR 30-44
4 Severe ↓GFR 15-29
5 Kidney failure <15 or dialysis
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ThinkKidneys/Ipsos MORI 2014
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CAUSES OF CHRONIC KIDNEY DISEASE*
• Diabetes (44%)—the number
one cause of kidney failure in
the US, especially type 2
diabetes
• High blood pressure (29%)—
also called hypertension, is the
second leading cause of kidney
failure
• Glomerular disease (7%)—
causes damage to the blood
vessels that filter blood in the
kidneys
• Polycystic kidney disease
(1.6%)—causes a buildup of
cysts in the kidneys, leading to
CKD
• Other (18.4%)—medication or
drug abuse, immune system
diseases (HIV, AIDS), lupus,
cancer and severe infection * Percentages are based on US stats
1. Fresenius Medical Care. Available from https://www.freseniuskidneycare.com/about-chronic-kidney-disease/whos-at-
risk/Causes#tabs
DIAB-1242435-0007
January 2018
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KEY LEARNING POINTS:
• Kidneys have numerous functions and don’t just produce urine.
• CKD is the gradual decline in renal function.
• Measured using eGFR.
• CKD is classified into 5 stages
• CKD has many different causes, with diabetes and hypertension being the most
common.
• Kidney function deteriorates naturally as we age – all the more important to look
after our kidneys
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CKD IN PRIMARY CARE
• Quality Improvements in CKD. Over 900,000 patients in general practice,
criterion for CKD register was 2 consecutive eGFR results at least 3 months
apart.
• Estimated prevalence of CKD 3-5 is 5.41% of entire population
• This means approximately 2.81 million people have CKD 3-5
• 97% of these have CKD 3
(de lusignan et al 2011)
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HUMAN AND FINANCIAL COSTS
• 40,000-45,000 premature deaths a year in people with CKD
• 7000 extra strokes and 12,000 extra heart attacks each year among people with CKD
• CKD costs the NHS more than breast, lung, colon and skin cancer combined.
• CKD costs the NHS £1.4billion per year
• CKD and its complications cost the NHS in England £1 in every £77 spent.
• Estimated costs for tests and consultations in primary care related to CKD are £143,000,000.
• Kerr, M et al (2012)
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SCREENING FOR CKD
• Diabetics
• Cardiovasular disease or CVD risk factors (IHD, chronic heart failure, peripheral or cerebral vascular disease)
• Hypertension
• Acute kidney injury
• Structural renal tract disease, recurrent kidney stones or prostatic hypertrophy
• Family history of CKD 5 or genetic predisposition
• Multi system diseases eg. Lupus, myeloma
• Opportunistic /Persistent detection haematuria or proteinuria (NICE CG 182, 2014)
• Nephrotoxic drugs
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IDENTIFYING CKD
• Minimum of 2 eGFR measurements over no less than 90 days
• New result of reduced eGFR repeat within 2 weeks to exclude AKI
• Accelerated progression of CKD defines as:
• Sustained increase in GFR of 25% or more and a change in GFR category within 12 months
OR
• Sustained decrease in GFR of 15mls/min/1.73m per year
• Focus particularly on those whose decline at current rate would likely lead to
needing dialysis
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DEATH – THE KEY OUTCOME IN CKD 27,998 CKD patients – outcomes at 66 months
•Keith DS et al. Arch Intern Med. 2004
1.1
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5
10
15
20
25
30
35
40
45
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f p
ati
en
ts
2 3 4
CKD Stage
ESRD
Death
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• To detect and identify proteinuria, NICE recommend ACR
• Urine ACR sensitive for low levels of proteinuria.
• For quantification and monitoring of proteinuria, PCR can be used.
• If initial ACR is between 3 - 70mg/mmol and, confirm with subsequent early
morning sample.
• Confirmed ACR of 3mg/mmol or more should be viewed as clinically
significant.
PROTEINURIA
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IMPORTANCE OF PROTEINURIA IN CKD
Interpretation Explanation
Marker of kidney damage
Spot urine ACR >30 mg/g or PCR>200 mg/g for >3 months defines CKD
Risk factor for adverse outcomes
Higher proteinuria predicts faster progression of kidney disease and increased risk of CVD.
Effect modifier for interventions
Strict BP control and ACE inhibitors are more effective in slowing kidney disease progression in patients with higher baseline proteinuria.
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FOCUS OF CARE?
• Focus particularly on those whose eGFR decline would lead to the need for renal replacement
therapy within their lifetime. (NICE Guideline 182, 2015)
• Diabetics who develop CKD have a substantial increase in risk of mortality. Individuals with
diabetes and no CKD mortality risk was 11.5%. With diabetes and CKD risk increases to
31.1.%.
• Patients with cancer, heart failure and CKD had a significantly higher risk of avoidable
readmission. Need close follow-up and monitoring in post discharge period. (Danze et al
2013)
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CKD MANAGEMENT – PRIMARY CARE
• Information and education:
• Inform patient of CKD diagnosis
• Investigate the cause of CKD
• Support self management and shared decision making
• Give access to medical data, including results PatientView
• Lifestyle advice – exercise, stop smoking, weight management
• Manage cardiovascular risk - Blood pressure control
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OBESITY, DIET AND CKD
• Don’t screen for CKD due to obesity
• Higher the BMI, more rapid and significant decline in renal function (Grubbs et al 2013)
• Yamahara et al (2013) found a direct link between obesity and kidney cell damage
• NICE (2014) Do not offer low protein diets to people with CKD
• Moderately increase exercise and eat no more than 2200 cals per day decreases the risk of
developing kidney stones. (Sorenson et al 2013)
• Eating more vegetable protein than animal protein reduces risk of dying of CKD by 14% for
every 10g increase in intake. Unclear as to whether this prolongs life of CKD patients. (Chen
et al 2013)
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CARDIOVASCULAR RISK MANAGEMENT AND CKD
• Prescribe statins as per NICE CG 181 (2016)
• Anti-platelet medications
• Systolic BP 120 – 139mmHg
• Diastolic BP below 90mmHg
• In people with CKD and diabetes or ACR 70mg/mmol or more, systolic BP should be
120-129mmHg and diastolic BP below 80mmHg
• Follow Hypertension NICE CG 136 (2019) if CKD, hypertension and ACR of less than
30mg/mmol and not diabetic
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BP CONTROL - SPECIFIC ADVICE
• ACE inhibitor or Angiotensin receptor blocker (ARB) should be prescribed if:
Diabetic and ACR of more than 3mg/mmol
Hypertension and an ACR of more than 30mg/mmol
ACR greater than 70mg/mmol
• Monitor GFR and potassium 1-2 weeks after starting ACEi/ARB
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GENERAL CKD MANAGEMENT
• Monitor regularly according to cause, rate of progression, comorbidities,
changes to medications, conservative management
• Check for anaemia CKD stages 3B, 4 and 5
• Monitor calcium, phosphate and PTH levels in CKD stages 4 and 5.
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REFERRAL TO NEPHROLOGY
• GFR less than 30mls/min (CKD stages 4 and 5)
• ACR of more than 70mg/mmol
• Decrease in GFR of 25% or more and a change in CKD category or decrease in GFR of
15mls/min or more within 12 months
• Poorly controlled hypertension despite the use of at least 4 anti-hypertensives
• Known or suspected rare or genetic causes of CKD
• Suspected renal artery stenosis
• Discuss with patient their wishes and preferences and take into account comorbidities
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KEY LEARNING POINTS
• Only screen those at risk according to NICE guideline
• Monitor regularly, checking serum eGFR and urine ACR
• Manage cardiovascular risk
• Provide information and support
• Email advice for referrals to Sheffield : [email protected].
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CKD PROGRESSION Uraemia
High blood pressure
Headaches
CVA
Heart failure
Blood/ protein in urine
Fluid retention
Oedema
Breathlessness
Anaemia
Loss of libido
Tiredness
Lack of energy
Confusion
Apathy
Itching
(Pruritus)
Cramp
Restless legs
Altered Taste
Nausea and vomiting
Loss of appetite
Weight loss
Malnutrition
Acidosis
Hyperkalaemia
Decreased calcium/ raised phosphate
levels
Increased risk of infection
Blood clotting problems
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PRE TREATMENT PHASE
• CKD Stage 4
• Increasing symptoms
• Common medications – anti-hypertensives, phosphate binders, sodium bicarbonate,
diuretics, erythropoetin injections, intravenous iron
• Treatment options: dialysis, transplantation or conservative management
• Planning of access for dialysis
• Transplant list/live donor
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CONSERVATIVE MANAGEMENT
• Specific term relating to those with
advanced renal disease, who choose
not to have dialysis or a transplant.
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END STAGE RENAL DISEASE - CKD STAGE 5
• eGFR less than 15mls/min
• Diet and fluid restrictions
• Psychological, social and financial impact
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KEY LEARNING POINTS
• Not everyone will choose to have dialysis or a transplant
• Not everyone will be on diet and fluid restrictions
• Preserve residual function
• Consider changes to medications
• Seek support from: Renal dieticians, Renal social workers, psychologists,
Kidney Care
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RENAL REPLACEMENT THERAPY
• Peritoneal dialysis
• Haemodialysis
• Transplant
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PD KEY LEARNING POINTS
• Carried out by the patient in their own home
• Performed via a Tenckhoff catheter that is surgically inserted
• Catheter needs to anchored securely when not in use
• Performed daily
• Observe for signs and symptoms of infection
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How Does Hemodialysis Work?
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ARTERIOVENOUS FISTULA (AVF)
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ARTERIOVENOUS GRAFT (AVG)
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VASCULAR CATHETER
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HD – THINGS TO REMEMBER
• Dialyse 3 times a week usually for 3 – 4 hours
• Hospital HD runs to timed slots
• Don’t give antihypertensive medication prior to dialysis
• Access must only be used for dialysis
• Some medications can be dialysed out
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KEY LEARNING POINTS
• Haemodialysis removes blood from the body, removes waste water and
solutes and puts it back
• 3 forms of access: AV Fistula, graft and central venous catheter
• Only use access for dialysis
• HD can be performed in hospital or at home by the patient
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WHY TRANSPLANT?
PHYSICAL BENEFITS
• Lower mortality
• Lower morbidity
• Cardiovascular
• Access related infection
• Increased fertility
• Increased “Vitality”
NON-PHYSICAL BENEFITS
• Less time receiving treatment
• Haemodialysis sessions
• PD exchanges
• Capacity to spend more time at work
• More cost effective
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TRANSPLANT OPERATION
• Incision made in lower abdomen.
• Right or left iliac fossa is the normal
site for a transplant.
• Kidney is attached to the the
external iliac artery and vein.
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TRANSPLANT – THINGS TO REMEMBER….
• Transplant – treatment not a cure
• ‘Waiting list’
• Medications
• Vaccinations and travel
• Skin care
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CONSERVATIVE MANAGEMENT
• Specific term relating to those with
advanced renal disease, who choose
not to have dialysis or a transplant.
• But what about those deteriorating
despite dialysis, and dialysis
withdrawal?
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RECOMMENDED TERMINOLOGY
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NHSIQ
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AIMS OF CONSERVATIVE MANAGEMENT (CM)
• Treat and control symptoms of ESRD without dialysis or transplantation
• Slow progression of CKD
• Maintain optimal quality of life
• Enable a good quality death
• Enable effective communication and decision with patient and family members
• Advanced care planning
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CHOOSING CM
• Viable option in the elderly and those with multiple comorbidities where
dialysis doesn’t offer a survival advantage.
• Patients with ischaemic heart disease were least likely to see a survival
benefit from dialysis
• Consider burden of dialysis
• CM patients 4 times more likely to die at home or in a hospice.
(O’Connor & Kumar 2012)
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SYMPTOM MANAGEMENT
• Renal anaemia – EPO, Intravenous iron
• Phosphate binders
• BP control
• Pain – check local policy for
recommended medications
• Diet and fluid restrictions
• Dialysis
• Constipation – lactulose, docusate,
senna, bisacodyl
• Nausea and vomiting –
metoclopramide, ondansetron,
haloperidol, levomepromazine
• Pruritis – creams, antihistamines
• Restless legs - Clonazepam
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END IF LIFE TRAJECTORIES
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RECOGNISING EOL IN RENAL PATIENTS
• ‘Surprise’ question ‘
• Would you be surprised if this
patient died within next 6-12
months?
• Intractable infection
• Increasingly severe symptoms
needing more complex management
• Multiple admissions
• Patient withdrawing
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RECOGNISING EOL IN RENAL PATIENTS
• Unintentional weight loss
• Needs help with 3 or more activities
of daily living
• Increasingly bedbound
• Evidence of skin breakdown
• Swallowing difficulties
• Dialysis related – increasing
difficulty with access
• Recurrent and problematic
hypotension on HD
• Loss of ultrafiltration on PD
• Patient frequently refusing dialysis
or states they want to stop
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RECOGNISING EOL IN RENAL PATIENTS – DISEASE RELATED
• Recurrent chest pain at rest or on dialysis
• Arrhythmias
• Chest pain resulting from physical activity
• Worsening PVD leading to amputation
• Recurrent cerebralvascular events resulting
in worsening functional ability
• Gut ischaemia
• Malignancy
• COPD
• Progressive dementia
• Presence of any other condition with less
than 6 months prognosis and no treatment
possible
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KEY LEARNING POINTS
• Conservative management is not the ‘no treatment’ option
• Recognising end of life in renal patients can be challenging but look for key
indicators
• Medication dose is often reduced in patients with advanced renal disease
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USEFUL LINKS AND SUPPORT
• www.britishrenal.org
• Think Kidneys
• Kidney Care (formerly known as BKPA)
• www.renal.org
• www.kidneypatientguide.org.uk
• www.kidney.org.uk
• Chronic Kidney Disease (Chronic Renal Failure) | Doctor | Patient UK
• British Journal of Renal Medicine
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CONTACTS:
• Andrea Fox, Teacher, School of Nursing, University of Sheffield
• Email: [email protected]
• Tel: 0114 2222079
• Louise Wild, AKI Nurse Educator, Renal Unit, STHFT
• Email: [email protected]
• Tel: 0114 2714460
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WHAT IS ACUTE KIDNEY INJURY (AKI)
• AKI is now the universal term used to describe sudden deterioration of renal
function, and it replaces the previous term know as Acute Renal Failure (ARF)
• AKI is detected by monitoring creatinine blood levels, and urine output
• AKI is a common condition amongst hospital inpatients and affects mortality
and length of stay
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AKI IS COMMON AND SERIOUS
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AKI RISK FACTORS AND INSULTS
• Age over 65 years old
• Chronic kidney disease, diabetes, heart failure, liver failure
• Sepsis
• Deteriorating early warning scores
• History of AKI
• Neurological or cognitive impairment
• Hypovolaemia
• Nephrotoxic medications and recreational drugs
• Urological obstruction
• RISK FACTORS + INSULTS = HIGH AKI RISK
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IDENTIFICATION
• Reduced urine output:
•< 0.5mls/kg/hr for 6 hours (half body
weight)
• Blood creatinine rise from baseline:
• 26mmols rise within 48 hours
•> 50% rise from baseline: lowest value
within 7 days, median value within 365
days
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MANAGEMENT OF AKI – S.T.O.P.
• Screen for Sepsis
• Toxins avoid/stop;
• Review medication
• Optimise B/P –assess volume status;
• Regular EWS monitoring
• Urine output monitoring
• IV fluids
• Hold antihypertensive’s
• Prevent Harm
• Identify cause/urinalysis
• Treat complications
• Review medications/fluid
• Daily U&Es, additional checks following
surgery or invasive procedures
• Patients identified as having AKI; “renal
profile”, allows monitoring of bicarbonate
in addition to creatinine and electrolytes
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KEY LEARNING POINTS
• AKI Risk Factors! Prevent
• Urine output! Identify
• Creatinine blood tests! Identify
• Finding and treating the underlying cause in a timely manner! Early
management prevents long term consequences
• Identify and Treat life threatening complications Management
• Hydration! Prevent/treat
• Medication review! Prevent/treat
• Patients! Inform/empower