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Managing Chronic Hyperkalemiin Renal Disease: New Tool
Prof. Bernard Canaud
Center of Excellence Medical EMEA, Bad Homburg, G
& University of Montpellier, School of Medicine, Montpellier, F
2016 Annual Dialysis ConferenceSeattle, Washington - February 27-March 1, 2016
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Speaker name: Prof. Bernard Canaud
I have the following potential conflicts of interest to report:
Consulting
Employment in industry (FMC)
Shareholder in a healthcare company
Owner of a healthcare company
Other(s)
I do not have any potential conflict of interest
Disclosure
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Outline of the Presentation
1. Chronic hyperkalemia: a common and serious problem in CKDpatients
−Patients at risk
−Risks and complications
2. Chronic hyperkalemia : indirect consequences – clinical concerns
−Limit usage of medications protecting kidney and cardiovascular system
3. Monitoring of chronic hyperkalemia : pitfalls and errors
4. Managing chronic hyperkalemia in CKD patients
−Traditional ways
−New tools
5. Take home message
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Outline of the Presentation
1. Chronic hyperkalemia: a common and serious problem in CKDpatients
−Patients at risk
−Risks and complications
2. Chronic hyperkalemia : indirect consequences – clinical concerns
−Limit usage of medications protecting kidney and cardiovascular system
3. Monitoring of chronic hyperkalemia : pitfalls and errors
4. Managing chronic hyperkalemia in CKD patients
−Traditional ways
−New tools
5. Take home message
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Distribution of Serum K in Diabetic and Non-Diabetic Patients
Loutradis C et al, Am J Nephrol 2015;42:351–3
Nested case–control study in outpatient renal clinic
360 CKD patients: 180 T2 diabetics/180 non-diabetics
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Prevalence of Hyperkalemia in Diabetic andNon-Diabetic Patients
Loutradis C et al, Am J Nephrol 2015;42:351–3
Nested case–control study in outpatient renal clinic
360 CKD patients: 180 T2 diabetics/180 non-diabetics
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Prevalence of Hyperkalemia in Diabetic andNon-Diabetic Patients According to CKD Stage
Loutradis C et al, Am J Nephrol 2015;42:351–3
Nested case–control study in outpatient renal clinic
360 CKD patients: 180 T2 diabetics/180 non-diabetics
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Patients at Risk of Hyperkalemia
•
Chronic kidney disease (GFR<30ml/min)• Distal Tubular Acidosis (type IV) with hyperkalemia
• Acute kidney injury
• Cardiac failure (Cardio-Renal syndrome)
• Diabetics (Diabetic nephropathy, Degenerative)
• Elderly
• Combined pathologies
• Patients receiving drugs that modulate renal elimination of potassium- Reducing production of angiotensin II (angiotensin-converting enzyme inhibitors, direct renin
inhibitors, β-adrenergic receptor antagonists)
- Blocking angiotensin II receptors (angiotensin receptor blockers)- Antagonizing action of aldosterone on mineralocorticoid receptors
(mineralocorticoid receptor blockers)
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K is a Serial Killer in Chronic Kidney DiseasePatients
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Hyperkalemia
AcuteHyperkalemia
• Imminent risk ofdeath
• Emergency actionrequired
ChronicHyperkalemia
• Delayed risk of death
• Long-term actionrequired
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Typical Case of Severe HyperkalemiaAlmost lethal…
Petrov DB , N Engl J Med 2012;366 (19):18
A 62-year old man with chronic renal
insufficiency reported having reducedexercise tolerance for the previous week…!
Serum Potassium was 9.1mmol/l Serum Potassium was 3.1mmol/l
IV Calcium ChlorideIV Sodium BicarbonateGlucose + Insulin therapyand Hemodialysis
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Cardiotoxicity of Hyperkalemia
Depolarization : sodium influx
Rapid depolarization: potassium efflux
Plateau : calcium influx
Repolarization: potassium efflux
Action potential of
myocardial contractile cell
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Hyperkalemia*
Potassium Gauge Meter
5.0
4.0
3.5 4.5
3.0
Hyperkalemia
* Normal pH, Normal AB status
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Long Interdialytic Interval Increases MortalityRisk in HD Patients
Foley RN et al. N Engl J Med 2011;365:1099-107. Zhang H et al. Kidney Int . 2012: 81, 1108–1115
Annualized CVD Admission Rate
Annualized Mortality Rate
32,065 HD Patients - USA
End-Stage Renal Disease Clinical Performance Measures Project
Relative risk of mortality (all-cause) by day
US
Europ
Japan
HD HD HDHD
22,163 HD patients DOPPS US, Europe, Japan
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Outline of the Presentation
1. Chronic hyperkalemia: a common and serious problem in CKD
patients
−Patients at risk
−Risks and complications
2. Chronic hyperkalemia : indirect consequences – clinical concerns
−Limit usage of medications protecting kidney and cardiovascular system
3. Monitoring of chronic hyperkalemia : pitfalls and errors
4. Managing chronic hyperkalemia in CKD patients
−Traditional ways
−New tools
5. Take home message
P t i B l i N l S bj t
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Potassium Balance in Normal SubjectPotassium Homeostasis – Zero Balance
Urinary Output
92 mM/day
Stool Output
8 mM/day
Dietary
Intake
100 mM/day
Normal Plasma [K+] 3.5 -
4.5 mM/L
ECF K+
65mM(1-2%)
ICF K+
3500 mmol (98-99%)
Potassium Gauge Meter
5.0
4.0
3.5 4.5
3.0
[K]
P t i B l i CKD5D P ti t
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Potassium Balance in CKD5D PatientNo More Potassium Homeostasis – Positive Balance
Urinary + DialysisOutput
80 mM/48hr
Stool Output8 mM/day
Dietary
Intake
100 mM/day
Plasma [K+]
3.5 – 6.0 mM/L
+
ECF K+
65mM(1-2%)
ICF K+
3500 mmol (98-99%)
Potassium Gauge Meter
5.0
4.0
3.5 4.5
3.0
[K]
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Transcellular Shifts of Potassium
ICF
H+
K+
Mg++
Ca++Acidosis
ECF ECF
ICF
H+
K+
Mg++
Ca++
Alkalosis
ECF ECF
Conditions Reducing Potassium Excretion
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Conditions Reducing Potassium ExcretionIncrease Risk of Hyperkalemia
RAAS Inhibition
Aldosterone Antagonist
Potassium in diet
Reduced K
excretion
K absorption from
small intestine CRS↓ GFR
AKI-CKD
↓GFR
DiabetesDM
HD
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Indirect Consequences of Hyperkalemia
Renin Angiotensin Aldosterone System (RAAS)
Aldosterone Blockade (AB)
Antihypertensive Nephroprotection Cardioprotection
Vasculoprotection Neuroprotection Antiproteinuric
Limit usage of protective
medications
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Outline of the Presentation
1. Chronic hyperkalemia: a common and serious problem in CKD
patients
−Patients at risk
−Risks and complications
2. Chronic hyperkalemia : indirect consequences – clinical concerns
−Limit usage of medications protecting kidney and cardiovascular system
3. Monitoring of chronic hyperkalemia : pitfalls and errors
4. Managing chronic hyperkalemia in CKD patients
−Traditional ways
−New tools
5. Take home message
Phlebotomy and Blood Collection May Affect
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Phlebotomy and Blood Collection May AffectHyperkalemia
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Hyperkalemia and ECG
T wave
tenting
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Association of Kalemia, CKD and ECG
CRISIS (Chronic Renal Insufficiency Standards Implementation Study)
Prospective epidemiological study of outcomes in chronic kidney disease (CKD).
376 CKD patients were eligible for the study
163 had ECG + serum potassium measurement
19 patients were excluded
(complete left or right bundle branch block or a ventricular paced ECG rhythm)
145 included in the final study cohort
Green D et al, Nephrol Dial Transplant 2013; 28: 99–
Variation in the Relationship Between Serum K
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Variation in the Relationship Between Serum Kand the Amplitude of the Tallest T:R Wave
Green D et al, Nephrol Dial Transplant 2013; 28: 99–
T:R Ratio of the amplitude of the tallest precordial T-wave and R-wave
T Wave Tenting Common but Not Predictive
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T Wave Tenting Common but Not PredictiveT:R Less Sensitive but More Specific
• Tenting was as common in normal range serum potassium as
hyperkalemia (33 versus 31%) and less common than in left
ventricular hypertrophy (44%)
• T:R was less sensitive (24 versus 33%) but more specific (85
versus 67%) than tenting at correctly identifying hyperkalemia
≥6.0 mmol/L.
Green D et al, Nephrol Dial Transplant 2013; 28: 99–
Cardiovascular and Sudden Death Risk As
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Cardiovascular and Sudden Death Risk AsEstimated from T-Wave to R-Wave Ratio
Cardiovascular event-free survival Cumulative event-free survival for sudden death
Green D et al, Nephrol Dial Transplant 2013; 28: 99–
O tli f th P t ti
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Outline of the Presentation
1. Chronic hyperkalemia: a common and serious problem in CKD
patients
−Patients at risk
−Risks and complications
2. Chronic hyperkalemia : indirect consequences – clinical concerns
−Limit usage of medications protecting kidney and cardiovascular system
3. Monitoring of chronic hyperkalemia : pitfalls and errors
4. Managing chronic hyperkalemia in CKD patients
−Traditional ways
−New tools
5. Take home message
Managing Chronic Hyperkalemia
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Managing Chronic HyperkalemiaTraditional Tools
I U i E ti ith L Di ti
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Increase Urine Excretion with Loop Diuretics
* Bumetanide
Ethacrynic acid (Edecrin)
Furosemide (Lasix)
Torsemide (Demadex)
Loop Diuretics*
Thick Ascending Loop of Henle
Mg++
Correct Acidosis & Facilitate K Transfer
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Sodium Bicarbonate Supplementation
Increase K Excretion in Feces
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Resin Binding Potassium in Colon
RAAS Inhibition
Aldosterone Antagonist
↓ GFR
↓GFR
Diabetes
Potassium in diet
Reduced K
excretion
K absorption from
small intestine
Increased K
excretion
Cation resin
exchange binds K
in colon
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Resin Binding Potassium in the Intestine : Old
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Resin Binding Potassium in the Intestine : Old
• Organic enteral potassium-sodium exchangeresin
• Non-selectively binds potassium and othercations (calcium & magnesium)
• Approved by the US FDA in 1958
• Commonly given with Sorbitol
• Diarrhea upregulates luminal losses ofpotassium
• Uncomfortable
• Side effects
• Sodium load
• ECF volume depletion• Pain, Electrolyte imbalance
• Occlusion…
Sodium Polystyrene Sulfonate
KayexalateAvailable in Europe
• Organic enteral potassium-calcium exchangeresin
• Non-selectively binds potassium and othercations (calcium & magnesium)
• Commonly given with Sorbitol
• Diarrhea upregulates luminal losses ofpotassium
• Uncomfortable
• Side effects
• ECF volume depletion
• Pain, Electrolyte imbalance
• Diarrhea…
Calcium Polystyrene Sulphonate
Sorbisterit
Potassium Exchange Resin
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Potassium Exchange Resin
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
K+
Resin
Bead
ResinBead
K+ K+
K+
K+
K+
K+K+
Na+
N
NNa+
Na+Na+
Na+
Na+
Na+ Na+
Na+
Na+
K+ being exchanged for Na+
Calcium Polystyrene Sulphonate
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
Resin
Bead
K+
ResinBead
ResinBead
K+ K+
K+
K
+
K+
K+
Ca++
Ca++
Ca++
Ca++
Ca++
Ca++
Ca++
Ca++
Ca++
Ca++
Ca++
K+
Ca++
Ca++
Ca++
K+ being exchanged for Ca++
Sodium Polystyrene Sulfonate
Clinical Studies Using Sodium Polystyrene
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Sulfate (Kayexalate) to Reduce Serum K Levels
Kessler C et al. J Hosp Med. 2011;6:136
Thompson K et al. J Renal Nutrition. 2013;23: 333
Outline of the Presentation
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Outline of the Presentation
1. Chronic hyperkalemia: a common and serious problem in CKD
patients−Patients at risk
−Risks and complications
2. Chronic hyperkalemia : indirect consequences – clinical concerns
−Limit usage of medications protecting kidney and cardiovascular system
3. Monitoring of chronic hyperkalemia : pitfalls and errors
4. Managing chronic hyperkalemia in CKD patients
−Traditional ways
−New tools
5. Take home message
New Emerging Potassium Binders
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New Emerging Potassium Binders
Patiromer Sorbitex Calcium
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Patiromer Sorbitex Calcium
• A novel potassium exchange polymer
• Powder, dry, odorless for suspension in water
• Consists of spherical beads with an average diameter of 100 μm
• Lower viscosity than polymeric drugs and powder (eg, sodium polystyrene sulfonate)
• Contains sorbitol (29% of weight) and calcium accounts (11%)
̶ 2 g of sorbitol + 0.8 g of calcium for every 4.2 g of patiromer
• Patiromer passes through gastrointestinal tract without degradation
• Principal site of action is colon
• Acts approximately 7 hours after ingestion
• Chronic therapy to treat hyperkalemia.
Patiromer Sorbitex Calciumpatiromer; RLY5016; Relypsa Inc., Redwood City, CA
Sodium Zirconium Cyclosilicate (SZ-9)
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Sodium Zirconium Cyclosilicate (SZ 9)
• A novel potassium exchange crystalline lattice
• ZS-9 is a potassium ion trap that was 3-dimensional structure engineered
̶ High affinity to potassium and balanced ratio of exchange ions
• ZS-9 is a highly selective crystalline lattice that preferentially entraps potassium cations
over other cations over divalent cations (eg, calcium and magnesium)
• ZS-9 appears to bind ammonium, resulting in net acid loss, systemic reduction in blood
urea nitrogen, and elevation in plasma bicarbonate.
• ZS-9 will be available as a tasteless, odorless, insoluble, and non absorbed powder (given
with 40-120 mL of water per dose), and potentially a tablet
• It requires no special handling or special preparation and does not have to be given in
solution or with cathartics such as sorbitol.
• Several clinical trials have tested ZS-9
Sodium Zirconium Cyclosilicate
ZS-9; ZS Pharma, Inc., Coppell, TX
Crystal Structure of SZ-9.
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Crystal Structure of SZ 9.
Blue spheres = oxygen atoms, red spheres = zirconium atoms, green spheres = silicon atoms.
Clinical Studies Using Patiromer SorbitexC l i t R d S K L l
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Calcium to Reduce Serum K Levels
McCullough PA et al. Rev Cardiovasc Med . 2015;16(2):140-15
Patiromer Effects in CKD Patients ReceivingRAAS Inhibitors and Hyperkalemia
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RAAS Inhibitors and Hyperkalemia
Weir MR et al. OPAL-HK investigators. N Engl J Med . 2015;372:211-22
Time to First Occurrence of Hyperkalemia afterRandomization
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Randomization
Weir MR et al. OPAL-HK investigators. N Engl J Med . 2015;372:211-22
Clinical Studies Using Sodium ZirconiumCyclosilicate (ZS 9) to Reduce Serum K Levels
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Cyclosilicate (ZS-9) to Reduce Serum K Levels
McCullough PA et al. Rev Cardiovasc Med . 2015;16(2):140-15
Study Design of ZS-9 Study on Hyperkalemia
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g
Packham DK et al. N Engl J Med. 2015;372:222-23
Acute Dose-Effects of SZ-9 on Serum Potassium
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Packham DK et al. N Engl J Med. 2015;372:222-23
Extended Dose-Effect of SZ-9 on Serum Potassium
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Packham DK et al. N Engl J Med. 2015;372:222-23
Design of the HARMONIZE trial in CKD AmbulatoryPatients with a Serum K level ≥ 5.1 mEq/L
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Patients with a Serum K level ≥ 5.1 mEq/L
Kosiborod M et al. HARMONIZE randomized clinical trial. JAMA. 2014;312:2223-223
Pha
Randomized Double-B
Placebo-Controlled
SZ-9
Time Behavior of Serum PotassiumConcentrations According to SZ-9 Dosage
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Concentrations According to SZ 9 Dosage
Kosiborod M et al. HARMONIZE randomized clinical trial. JAMA. 2014;312:2223-223
Comparative Effectiveness of SPS, Patiromer Sorbitex Calcium andSodium Zirconium Cyclosilicate According to Baseline eGFR
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y g
McCullough PA et al. Rev Cardiovasc Med . 2015;16(2):140-15
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Safety Results for Sodium Polystyrene Sulfonate, PatiromSorbitex Calcium, and Sodium Zirconium Cyclosilicate
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, y
McCullough PA et al. Rev Cardiovasc Med . 2015;16(2):140-15
Outline of the Presentation
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1. Chronic hyperkalemia: a common and serious problem in CKD
patients−Patients at risk
−Risks and complications
2. Chronic hyperkalemia : indirect consequences – clinical concerns
−
Limit usage of medications protecting kidney and cardiovascular system3. Monitoring of chronic hyperkalemia : pitfalls and errors
4. Managing chronic hyperkalemia in CKD patients
−Traditional ways
−New tools
5. Take home message
Limitations and Remaining Questions
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• No head-to-head randomized, controlled trials of two or more agents (novel
agent vs novel agent or versus sodium polystyrene sulfate)• Acute emergency treatment of hyperkalemia have not been tested with these
novel agents
• In the setting of acute kidney injury, effects of patiromer or ZS-9 have not beenevaluated
• Alternative routes of administration (nasogastric tube or rectal administration,
enema) for these novel agents have not been tested to date• Long term treatment (months to year) of hyperkalemia with these novel K
binders has not explored
• Most common clinical indications of hyperkalemia that requires treatment havenot been evaluated in clinical trials
• Long-term safety and efficacy of these new K binders cannot be inferred today
• Cost-effectiveness has not been addressed
Conclusions
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• Novel therapies, including the polymer patiromer sorbitex calcium and
sodium zirconium cyclosilicate 9 trap, are promising both as acutemedications and as adjunctive therapies for hyperkalemia
• Novel therapies may allow greater use of RAAS (ACE inhibitors, ARBs, and
MRAs ) and Aldosterone Blockade in vulnerable patients (hypertensive,
CKD, Cardiac…)
• Remaining questions to be addressed in long term studies
• Patient acceptance,
• Long term safety,
• Best use,
• Cost-effectiveness