Polypharmacy+and+the+ Managementof+Mul4ple+ ChronicCondions+€¦ ·...
Transcript of Polypharmacy+and+the+ Managementof+Mul4ple+ ChronicCondions+€¦ ·...
Polypharmacy and the Management of Mul4ple
Chronic Condi4ons
Cara Tannenbaum MD, MSc Paula Rochon MD, MPH, FRCPC
Barbara Farrell BScPhm, PharmD, FCSHP
Panel
Cara Tannenbaum MD, MSc Prac4cing geriatrician, Associate Professor of Medicine and Pharmacy Michel Saucier Endowed Chair on Geriatric Pharmacology Health and Aging, Université de Montréal.
Paula Rochon MD, MPH, FRCPC Vice President and Senior Scien4st, Women’s College Research Ins4tute, Women’s College Hospital Professor, Department of Medicine, University of Toronto.
Barbara Farrell BScPhm, PharmD, FCSHP Pharmacist, Bruyère Geriatric Day Hospital and Scien4st, Bruyère Research Ins4tute – OOawa. Assistant Professor, Department of Family Medicine, University of OOawa and Adjunct Assistant Professor, School of Pharmacy, University of Waterloo.
Disclosures
n Cara has previously consulted for Pfizer, Allergen, Watson and Ferring Pharmaceu4cals but reports no conflicts of interest for this presenta4on.
n Paula has no conflicts of interest for this presenta4on.
n Barbara has no conflicts of interest for this presenta4on.
Polypharmacy
n Polypharmacy is a risk factor for: n Drug-‐drug interac4ons n Prescribing cascades n Difficulty managing the complex pa4ent
n Resul4ng in: n Falls and cogni4ve impairment n Emergency room visits and hospitaliza4ons
Objec4ves
n Par4cipants will be able to: 1. Recognize “inappropriate” prescribing 2. Use interprofessional interven4ons to reduce inappropriate
prescribing 3. Recognize prescribing cascades 4. Iden4fy poten4al drug-‐drug and drug-‐disease interac4ons in
clinical prac4ce guidelines 5. Have an approach to tapering
or stopping medica4ons
Outline
n “Inappropriate” prescribing n Case presenta4on #1 n Group discussion of Beers and STOPP/START
n Prescribing Cascades n Case presenta4on #2 n Group/Panel discussion on prescribing cascades
n Avoiding drug interac4ons in clinical prac4ce guidelines
n Case presenta4on #3 n Group/Panel discussion on drug interac4ons
n Take home 4ps
“Inappropriate” Prescribing Case 1 Mrs. A
} Widow living alone } 84 years old } Severe knee pain limi4ng mobility
} Ocen confused, unable to get out of bed
} 3 falls in the last year } Doesn’t want to go out anymore
} Not always taking meds } Children think she should no longer be living alone
} ASA 81mg daily } ibuprofen 400mg bid* } dimenhydrinate 50mg qhs } lorazepam 1mg qhs* } warfarin as directed* } metoprolol 50mg bid* } amlodipine 10mg daily* } ramipril 5mg daily* } Lakota capsules qid } furosemide 40mg bid* } atorvasta4n 40mg daily* } dextromethorphan syrup } lansoprazole 30mg daily* } oxybutynin XL 10mg daily* } vit. B12 1200mcg daily* } Potassium daily* } calcium/vit D bid*
Medica4ons
• Prescription Drugs
• Over the Counter Products
• Herbal Therapies
What do we mean by “Medications”?
Group Discussion Using Beers and STOPP/START
GROUP 1 GROUP 2 n Read the case n Apply the Beers criteria to iden4fy medica4on problems
n Read the case n Apply the STOPP/START criteria to iden4fy medica4on problems
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Screening tool impressions
n Were the criteria effec4ve in iden4fying drug therapy problems?
n Were there other problems not picked up by these screening tools?
n What are the limita4ons of these screening tools?
10 years ago
• Atrial fibrillation – metoprolol and warfarin • Husband died - lorazepam
3-5 years ago
• Knee pain - ibuprofen • Hypertension – ramipril • Cough – dextromethorphan • Hypertension – amlodipine • Daughter told her to take ASA for hypertension
2 years ago
• Ankle swelling; furosemide • Potassium low; potassium • Nausea; dimenhydrinate • Nausea (and taking ibuprofen): lansoprazole • B12 levels low; B12 supplement • Knee pain: Lakota • Nocturia; oxybutynin • Osteopenia: calcium/vitamin D
Mrs. A’s history
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A prescribing ‘web’
ASA ramipril dextromethorphan
amlodipine furosemide potassium
dimenhydrinate
Ibuprofen oxybutynin lorazepam lansoprazole vitamin B12
Mrs. A’s medica4on changes
• Stop ASA and Lakota
• Decrease dimenhydrinate
Week 1
• Switch ibuprofen to acetaminophen
• Physio and exercise
• Stop B12
Week 2 • Document BP target
• Begin amlodipine taper
• Begin lansoprazole taper
Week 3
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Mrs. A’s medica4on changes
• Stop amlodipine • Increase
acetaminophen dose
• Start lorazepam taper
• Provide sleep hygiene education
Week 4
• Switch acetaminophen to small dose hydromorphone
• Taper ramipril • Start furosemide
taper • Add lactulose
Week 5 • Stop ramipril • Stop
furosemide • Stop potassium • Taper
oxybutynin
Week 6
14
Mrs. A’s medica4on changes
• Stop dextromethorphan and dimenhydrinate
• Review and advise re: salt and calcium intake
• Start HCTZ • Continue lorazepam
taper
Week 7
• Stop oxybutynin • Stop lorazepam • Change
lansoprazole to prn
• Provide heartburn education
Week 8 • Change metoprolol to bisoprolol
• Combine calcium and vitamin D
• Stop lansoprazole
Week 9
15
16
Acer a 10 week Day Hospital stay
Mrs. A’s medica4ons § Hydromorphone 0.5mg q12h § Hydrochlorothiazide 12.5mg daily § Bisoprolol 2.5mg daily § Warfarin as directed § Caltrate Select with Vitamin D twice daily § Lactulose 15ml daily
Mrs. A’s life: § Knee pain much improved § Geong out of the house now § Urgency and nocturia beOer (up 1-‐2x/night) § Sleep improved (to bed 10pm, up about 7am) § Meal 4mes normal (8, noon, 6) § Bruising and gum bleeding gone § No heartburn, nausea, cough or swollen ankles
Examples of team contribu4ons to managing polypharmacy
n Physiotherapist – helping to manage pain, assis4ng with exercise programs
n Social Worker – helping to deal with anxiety, depression, isola4on affec4ng sleep and depression
n Occupa4onal therapist – helping with mobility aids to manage pain n Die4cian – helping to use dietary approaches instead of
supplementa4on n Nurse – monitoring impact of medica4on changes, providing
educa4on re: nonpharmacologic approaches (sleep hygiene, GERD management)
n Recrea4on therapist – helping to deal with isola4on, access to programs
n Pharmacist – helping to iden4fy drug-‐related problems, develop plans for medica4on changes and monitoring
Prescribing Cascades Case 2: Mrs. B
n Mrs. B was diagnosed with
vascular demen4a acer a stroke, MMSE 16
n Her son read on the internet that donepezil improve symptoms of vascular demen4a
n She is prescribed donepezil to improve her memory
n On subsequent visit, dose of
donepezil is increased
n 2 months later, returns for visit and describes problem with incon4nence
n Referral sent to urology to assess incon4nence
Prescribing Cascades Case 2: Mrs. B
Urologist prescribes oxybu4nin to treat incon4nence
n Oxybu4nin acts by blocking cholinergic receptors and preven4ng s4mula4on by acetylcholine.
n Opposing cholinergic mechanisms
n Two small studies found no clinical deteriora4ons in the MMSE score in pa4ents taking both cholinesterase inhibitors and bladder an4cholinergic agents.
Sakadkibara et al. J Am Geriatr Soc 2009 Isik et al. J Nutr Health Aging 2008
Cognitive Decline <----------> Improved Memory Urinary Retention <----------> Incontinence
An4cholinergics and cholinesterase inhibitors
An4cholinergic toxidromes “Mad as a ha'er, dry as a bone, the bowel and bladder lose their tone.”
An4cholinergics can cause confusion and urinary reten4on
http://en.wikipedia.org/wiki/Toxidrome
What is a Prescribing Cascade?
Initial Drug Therapy
New Medical Condition
Further Medical Condition
New Drug Treatment
Rochon PA, Gurwitz JH. BMJ 1997
Common examples
n Ibuprofen → hypertension → an4hypertensive
n Metoclopramide → parkinsonism → Sinemet
n Risperidone → parkinsonism → an4parkinson meds
n Amlodipine → edema → furosemide
n Lithium → tremor → propanolol
Common Examples
n Amitriptyline → cogni4on → donepezil
n Furosemide → hypokalemia → potassium
n Omeprazole → low B12 → B12 supplement
Over the counter: n Narco4c → cons4pa4on → laxa4ves
n Lorazepam → morning drowsiness → caffeine
n Enalapril → cough → dextromethorphan
Mrs B’s Prescribing Cascade
Cholinesterase Inhibitors
Urinary Incontinence
Cognitive Decline and
Delirium
Anticholinergic Drug
Gill SS, Rochon PA et al. Arch Intern Med 2005
What the data shows
n 44884 older adults in Ontario with demen4a n Average age more than 80 n Almost 65% were women
Gill SS, Mamdani MM, Rochon PA et al Arch Intern Med 2005
Combined use of ChI with overac4ve bladder medica4ons may worsen func4on
-1.62
-1.08
-1.8-1.6-1.4-1.2
-1-0.8-0.6-0.4-0.2
0ChI Alone ChI + OAB med
ChI AloneChI + OAB med
Sink KM, et al. J Am Geriatr Soc. 2008; 56: 847-853.
Change in activity of daily living score in fairly independent nursing home residents (top quartile)
Dai
ly li
ving
sco
re (u
nits
)
In high-functioning nursing home residents, dual use of cholinesterase inhibitors and overactive bladder medications may result in greater rates of functional decline.
Taking pa4ent preference into account
n What would you do for Mrs. B? n A) con4nue to prescribe both donepezil and oxybutyn n B) discon4nue donepezil n C) discon4nue oxybutyn n D) discon4nue both
Avoiding Drug Interactions in Clinical Practice Guidelines
n Clinical guidelines typically focus on a single disease at a 4me
n The reality is that people ocen have mul4ple coexis4ng medical condi4ons
n In Canada: n 1-‐in-‐4 seniors has > 3 condi4ons n Seniors with 1-‐2 chronic condi4ons take 3-‐4 prescrip4on medica4ons n Seniors with 3 or more condi4ons take 6 different medica4ons on average
Canadian Institute for Health Information. Seniors and the Health Care System: What is the Impact of Multiple Chronic Conditions. Ottawa, Ontario, 2011.
Avoiding Drug Interactions in Clinical Practice Guidelines Case 3: Mr. S
9 medical condi4ons n Cardiovascular disease – STEMI
10 & 2 years ago, admiOed last year for heart failure, EF 30%
n Hypertension x 20 years n Diabetes Type 2 x 15 years n Hypercholesterolemia x 15 years n Osteoporosis x 10 years n Hypothyroidism x 8 years n Post-‐prostatectomy for prostate
cancer x 5 years n Urinary incon4nence x 1 year n Depression x 6 months
82 years old
16 medica4ons n Amiodarone 200 mg bid, Furosemide 40 mg
bid, ASA 80 mg daily n Monopril 10 mg daily, Nifedipine XL 30 mg
daily n Atorvasta4n 10 mg po daily n Mewormin 500 bid, Glyburide 5 mg bid,
Rosiglitazone 2 mg bid n Alendronate 70 mg/wk, Calcium carbonate
1000 mg/day, Vitamin D 800 IU/day n Pantoprozole 40 mg daily n Levothyroxine 0.125 mg daily n Oxazepam 15 mg po qhs n Started on paroxe4ne 40 mg daily 6 months
ago
82 years old
Mr. S.
Great job following the guidelines!
Chronic heart failure ACE inhibitor and diuretics (2012 Canadian Cardiovascular Society guidelines)
Hypertension target 130/80 ACE inhibitor and CCB (2011 Canadian Hypertension Educa4on Program recommenda4ons for pa4ents with diabetes)
Diabetes target HbA1C < 7% Oral hypoglycemic agents
(2008 Canadian Diabetes Associa4on clinical prac4ce guidelines)
Dyslipidemia target LDL-C < 2.0 mmol/L Statin (2008 Canadian Diabetes Associa4on clinical prac4ce guidelines for high risk diabe4c pa4ents)
Osteoporosis Bisphosphonate, Calcium, Vitamin D
(2010 Canadian Osteoporosis Society guidelines)
Urinary incontinence Kegel exercises! (2012 Interna4onal Consulta4on on Incon4nence)
Use of ASA in elderly Proton Pump Inhibitor to reduce GI bleeding (2009 Canadian Associa4on of Gastroenterology Consensus Group on long-‐term NSAID therapy and gastroprotec4on)
Read the case again, list any drug interac4ons
n Drug-‐food interac4ons
n Drug-‐disease interac4ons
n Drug-‐drug interac4ons n Pharmacokine4cs : what the body does to the drug n Pharmacodynamics : what the drug does to the body
Night-time diuretics Venous insufficiency
Interaction 1: Calcium inhibits levothyroxine absorption
Singh et al. JAMA 2000;283:2822-2825
Ca2++
Synthroid
X
Drug-food or drug-drug interaction
Interaction 2: Glitazone oral hypoglycemics increase risk of heart failure
n Health Canada warning 2001 on Avandia® (rosiglitazone maleate): n Thiazolidinedione (TZD) class of oral
hypoglycemic agents can cause fluid reten4on, which can exacerbate or lead to heart failure
n 2012 Canadian Cardiovascular Society
guidelines recommend against the use of glitazone hypoglycemic agents in pa4ents with chronic heart failure
Drug disease interaction
http://www.hc-sc.gc.ca/dhp-mps/alt_formats/hpfb-dgpsa/pdf/medeff/avandia_hpc-cps-eng.pdf
Increases preload
Blood backs up, causing heart failure
Weakened heart muscle can’t squeeze as well
Interaction 3: ACE inhibitors , calcium channel blockers, loop diuretics contribute to
urinary incontinence
Drug disease interaction
Tannenbaum C. BJUI online 2011
Interaction 4: Proton pump inhibitors reduce antifracture efficacy of bisphosphonates
Abrahamsen et al. Arch Int Med 2011;171:998-1004
*17% of the population studied was male
Drug disease / drug-drug interaction
Risk of Hip Fracture with Alendronate in Adults > 70 years old
Lower Risk Higher Risk
0 0.50 1.00 1.50 2.00
No PPI
<1 year PPI
1-2 years PPI
> 2 years PPI
Any PPI
PPI’s increase gastric pH : diminished absorption of Ca2+
vitamin B12?
Cytochrome interac4ons 5,6,7,8,9,10….
Many drugs are ac4vated or inac4vated by different hepa4c cytochrome (CYP) enzymes. n When two or more drugs share the same metabolic pathway, there may
be compe44on for drug metabolism leading to changes in serum levels of certain drugs.
CYP1A2
CYP2B6
CYP2C8
CYP2C9
CYP2C19
CYP2D6
CYP3A4
What happens when each cytochrome gets overloaded by too many drugs?
Altered biotransformation → Drug levels too high → Side effects OR → Drug levels too low → Therapeutic failure
Each medica4on binds differently to its cytochrome
Weak binding
Strong binding
Facilitator
Inhibitor Moderate binding
Most frequent interac4ons are with cytochromes CYP3A4 and CYP2D6
Cytochrome Proportion of interactions (%)
3A4 70.1
2D6 22.7
2C9 3.4
2C19 2.1
1A2 1.7
2B6 0
Zakrzewski-Jakubiak et al. Am J Ger Pharmacother 2011
Among 100 patients age 65+ with 5+ medications
Food and herbals also bind to different cytochromes
2D6, 2C9, 3A4 Inhibitor 3A4 Inhibitor
3A4 Inducer, 2C9 Inhibitor CYP 2C9
Cytochrome-‐mediated interac4ons can increase toxicity or reduce efficacy
Medication CYP 1A2
CYP 2B6
CYP 2C8
CYP 2C9
CYP 2C19
CYP 2D6
CYP 3A4
Amiodarone
Furosemide No cytochrome metabolism
Alendronate No cytochrome metabolism
Paroxetine
Nifedipine
Levothyroxine No cytochrome metabolism
Oxazepam No cytochrome metabolism
Atorvastatin
Monopril No cytochrome metabolism
Glucophage No cytochrome metabolism
Glyburide
Rosiglitazone
Pantoprazole
Inhibitor Strong affinity substrate Moderate-weak affinity substrate ws-
ddi.i
nter
med
-rx.
ca
275 pa4ents aged 65+ admiLed to an acute care hospital 80% had cytochrome drug-‐drug interac4ons
Doan et al. Ann Pharmacotherapy 2013
The number of cytochrome drug-drug interactions increases as a function of the number of drugs consumed
Mr. S
>10 years ago
• Hypertension– nifedipine XL • Diabetes – metformin, glyburide, rosiglitazone • High cholesterol - atorvastatin • First myocardial infarction – ASA • Isolated episode of atrial fibrillation in CCU - amiodarone
2-10 years ago
• Osteoporosis screening – alendronate, calcium, Vit D • Hypothyroidism – synthroid • Second myocardial infarction, congestive heart failure –
lasix, monopril • Insomnia during hospitalization – discharged with
oxazepam • Gastroprotection – pantoprazole • Radical prostatectomy for prostate cancer
>1 year ago
• Urinary incontinence – Kegel’s • Depression due to incontinence - paroxetine
Mr. S’s history
49
Other inappropriate/unnecessary prescrip4ons
n Amiodarone : Beers list, prescribing cascade causing hypothyroidism, no recurrence of A. fib, cytochrome inhibi4on
n ASA: Canadian Cardiovascular Society recommends to avoid in pa4ents with reduced ejec4on frac4on heart failure
n Lasix 40 mg bid: Canadian Cardiovascular Society recommends dose reduc4on in stable pa4ents
n Alendronate: 5-‐10 years increases the risk of atypical fractures, is it being absorbed?
n Paroxe4ne: can we treat the cause of Mr. S.’s depression?
What to do first?
n Decide what should be tapered or stopped n Stop the easy ones (no longer needed, have long half-‐
lives, don’t cause adverse drug withdrawal events) n Amiodarone n Alendronate n ASA
n Stop the drugs causing side effects n Drugs that can cause adverse drug withdrawal events
need to be tapered e.g. beta-‐blockers, benzodiazepines, SSRIs, PPIs, diure4cs, narco4cs, an4convulsants, an4psycho4cs
Mr. S’s medica4on changes
• Stop ASA • Stop
rosiglitazone • Stop
amiodarone • Monitor glucose
Week 1
• Provide sleep hygiene education
• Teach heart failure self-management
• Start glyburide taper 2.5 mg bid
Month 2 • Begin twenty week oxazepam taper
• Begin nifedipine XL taper 20 mg once daily
• Stop alendronate
Month 4
53
Mr. S’s medica4on changes
• Stop nifedipine • Start bisoprolol 2.5
mg bid (not metabolized by CYP 450)
• Switch atorvastatin to rosuvastatin (CYP2C9)
Month 6
• Start elastic stockings
• Start furosemide taper 20 mg bid
• Discontinue glyburide
• Increase dose of metformin 500 tid
Month 8 • Start pantoprazole taper 20 mg daily
• Increase dose of bisoprolol 5 mg bid
• Discontinue oxazepam
• Continue furosemide taper 20 mg daily
Month 10
54
55
At 1 year follow-‐up
Mr. S’s medica4ons § Bisoprolol 5 mg bid § Monopril 10 mg daily § Lasix 20 mg at 5 pm § Mewormin 750 mg 4d § Rosuvasta4n 10 mg daily § Synthroid 0.125 mg – repeat TSH yearly § Calcium and Vitamin D (no longer given at same 4me as synthroid) § Schedule repeat bone density in 6 months
Mr. S’s life: § Less fluid reten4on § Less fa4gued § Urinary urgency and urge incon4nence improved § No more weakness/ unsteady gait § Lower risk of falls § Lower risk of hypoglycemia § Less depressed: taper and discon4nue paroxe4ne over the next 2 months
Take home 4ps n Use screening criteria to iden4fy ‘poten4ally
inappropriate medica4ons’ n For every sign or symptom, always ask ‘can this be caused
by a drug’? n Review the chronology of all prescrip4ons n Review indica4ons n Subs4tute with drugs not metabolized by the same
cytochrome n Change the 4me of administra4on of the drug n Use non-‐pharmacologic approaches n Work as a team: pharmacist, nurse, physio etc.
Resources and References
n Beers: hOp://www.americangeriatrics.org/health_care_professionals/clinical_prac4ce/clinical_guidelines_recommenda4ons/2012
n STOPP/START: hOp://www.biomedcentral.com/imedia/3973756062468072/supp1.doc
n InterMED-‐Rx: ws-‐ddi.intermed-‐rx.ca
n Drug discon4nua4on algorithm: hOp://www.uptodate.com/contents/drug-‐prescribing-‐for-‐older-‐adults