2017 marrch annual conference chris bundy, md, mph medical … · 2018-04-01 · immigrants...
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Chris Bundy, MD, MPH Medical Director Washington Physicians Health Program Clinical Associate Professor of Psychiatry University of Washington School of Medicine
2017 MARRCH Annual Conference October 31, 2017
Disclosure:
No commercial interests or conflicts to report
No conflicts of interest to report
1. Analyze the clinical and public health implications of cannabis legalization and commercialization
2. Summarize the neurobiology and evidence regarding risks and benefits of cannabis use
3. Formulate strategies for counseling patients and advising colleagues about cannabis use and health
484 known biological compounds
At least 84 brain-active cannabinoids
Flowers, seeds, leaves and stems are consumed
Most widely used illicit substance in Western culture
Longest recorded history of human use
Medicinal effects (unrelated to psychoactive properties) recognized in Chinese texts 3000 BC
Psychoactive properties introduced to the America’s through the Arab world in the 19th century
Marihuana Tax Act 1937: fear of recreational use among Mexican immigrants “spreading” to the general population stigmatizing label
Pacher et al. Pharmacol Rev. 2006
Receptors: CB1 (CNS) and CB2 (immune); (Matsuda 1990)
Natural ligand: Anandamide (fatty acid neurotransmitter)
CB1 is the most abundant receptor in the mammalian brain
Master Neurotransmitter: tonic neuromodulation of multiple systems and subsystems
Influences dendritic pruning: critical to adolescent adult brain development
Pacher et al. Pharmacol Rev. 2006
∆9-tetrahydrocannabinol (Gaoni, Mechoulam 1964)
Structural analogue to anandamide, binds to CB1
Primary psychoactive constituent in cannabis
Localization of THC binding sites (CB1 Receptors)
THC binds CB1 receptors in VTA DA release in NA
40% of the plant’s phytochemical extract
Charlotte’s Web (0.3%THC /high CBD hemp product)
Negligible affinity at CB1/CB2 receptors
May be an indirect antagonist
Powerful anti-oxidant, possible anticonvulsant and antipsychotic properties
Significant interest in developing medical uses Nabiximols: 1:1 CBD:THC aerosol for pain 2/2 MS
Epidiolex: CBD oil in clinical trials for refractory epilepsy
Dense concentration of cannabinoid receptors in the amygdala (Katona,Rancz et al.2001)
Responds to THC by quickly downregulating receptors
14 days of daily use reduces receptors by 24% (Romero, Berrendero et al.1998)
CB1 downregulation = less novelty (boredom, amotivational syndrome?), less forgetting painful memories (PTSD), less buffering capacity
Downregulation may contribute to the cannabis withdrawal syndrome on cessation of regular use
Decrimininalization: treats possession of small amounts of cannabis for personal use as a civil, rather than criminal offense
Legalization: creates a legal, regulated market for the sale and distribution
Medicalization: special decriminalization for medical users
Commercialization: product development including advertising, sales promotion, and marketing to encourage and increase product adoption and demand
By 2001 10 states had decriminalized cannabis Alaska
California
Colorado
Nebraska
New York
North Carolina
Maine
Minnesota
Ohio
Oregon
1996: California (Prop 215)
1998: Alaska, Oregon, Washington
1999: Maine
2000: Colorado, Hawaii, Nevada
2004: Montana
2006: Rhode Island
2007: New Mexico, Vermont
2008: Michigan
2010: Arizona, New Jersey
2011: Delaware, Washington, D.C.
2012: Connecticut, Massachusetts
2013: New Hampshire, Illinois
2014: Maryland, Minnesota
29 States including DC Guam, Puerto Rico 2018 Campaigns in MI, MO, SD, OK, UT
FY2015 WA
Sales
$ 259,522,322;
Excise Tax
$64,880,581
FY2016 WA
Sales
$786,449,599
Excise Tax
$185,678,648
Initial excise tax forecast projections (2013)
FY 2015 $36.3 million FY 2016 $80.0 million FY 2017 $119.8 million FY 2018 $160.2 million FY 2019 $193.5 million
Current excise tax forecast projections* (Feb. 2016) n/a FY 2016 $164.0 million FY 2017 $268.7 million FY 2018 $329.5 million FY 2019 $361.8 million
0
20000
40000
60000
80000
100000
120000
Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15
Un
its
Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15
Solid Edibles 0 1520 4099 7661 21938 41249 45226 55516 73056 89153 107093 112825
Liquid Edibles 0 0 22 3165 8114 10733 20417 13470 27656 25607 30191 32762
Extract for Inhalation 1740 13929 5926 11355 15324 24425 31415 41875 58354 75397 97379 114264
Topicals 0 0 0 0 66 245 277 520 924 1730 2936 3963
Marijuana Concentrate and Infused Product Sales
1960
1965
1970
1974
1978
1980
1983
1984
1985
1986
1990
1992
1993
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
THC 0.2 0.2 0.4 0.5 1 1 1.5 3.3 3.3 3.5 3.5 3.1 3.1 4 4.5 5.2 5 4.7 5.4 6.2 7.3 7.2 8.3 8.1 9.1 10 10 9.9 11 11CBD 0.3 0.3 0.4 0.4 0.3 0.3 0.4 0.4 0.4 0.4 0.5 0.5 0.4 0.5 0.5 0.5 0.5 0.5 0.4
0
2
4
6
8
10
12
14
MA
RIJ
UA
NA
PO
TE
NC
Y
CBD: NON-
Psychoactive Ingredient
Average THC and CBD
Mehmedic et al., 2010
THC: Psychoactive
Ingredient
19
Recreational Legalized
Courtesy Of Ben Cort: Smart Approaches to Marijuana
Highest Measured
Highest Strains (Indica/Sativa Hybrids): • Cali Kush Farms Emperor
Cookie Dough - 31.1% • Chem D.O.G. - 32.13%
“Budder” “Shatter”
“Ear Wax” “Green Crack” wax
Hash Oil Capsules
Butane Hash Oil (BHO)
10 mg is a legal dose or “serving size”
Packaging and dosing in retails is regulated
Unintentional ingestion by children 2.82 x calls for children 6 or younger to poison control in states with legal MM 2000-2013*
*The Health Effects of Cannabis and Cannabinoids: The Current State of Evidence and Recommendations for Research. National Academy of SEM 2017.
Most commonly used illicit drug in US: 22.2 million current users
Lifetime prevalence 42%
Past year 12%
Current (past mo): Increased 6.2% 8.3% 2002-2014
Johnson et al. Monitoring the Future Survey 1975-2013
http://monitoringthefuture.org/pubs/monographs/mtf-overview2013.pdf
Courtesy Bertha Madras, PhD, Harvard Medical School
www.rmhidta.org
www.rmhidta.org
www.rmhidta.org
Cannabis: Health Effects
CONDITION VOLKOW NEJM 2014 REVIEW RISKS/BENEFITS
WHITING JAMA 2015 79 RCT’s BENEFITS
NATIONAL ACAD SCI 2017 10k ABSTRACTS RISKS/BENEFITS
MJ ADDICTION HIGH YES
ABNL BRAIN DEV MOD
COG IMPAIRMENT CURRENT USERS; LIMITED IN PAST USERS
GATEWAY MOD
SCHIZOPHRENIA MOD LIKELY INCR RISK
DEP/ANXIETY MOD INC RISK
ACHIEVEMENT HIGH LIMITED
MVA/DEATH/OD IN KIDS HIGH INC RISK
CH BRONCHITIS HIGH INC RISK
LUNG CA LOW NO EVIDENCE
PAIN EFFECTIVE MODERATE EFFECTIVE
SPASTICITY EFFECTIVE MODERATE EFFECTIVE
CINV NAUS>VOM LOW LOW
HIV/AIDS ANOREXIA YES BUT NO EFFECT ON MORTALITY
LOW LOW
GLAUCOMA INSUFF EVIDENCE NONE LOW
Devinsky et al. Cannabidiol in patients with treatment resistant epilepsy. Lancet Neurology 2016; 15: 270-78
Multisite trial, n=214
76% (162) completed 12wk safety/tolerability trial
64% (137) completed efficacy trial
79% of safety group had adverse effects (somnolence 25%, dec appetite 19%, diarrhea 19%, fatigue 13%, convulsions 11%)
30% serious adverse effects (1 death – unrelated to CBD, 12% related to drug with half status epilepticus)
3% (5) discontinued due to AE
Median monthly motor szs decreased from 30 to 15.8 at 12 weeks; median change was -36.5%
Open trails needed; high placebo response rate in children
CO: unpurified CBD migrants vs resident responders (47% v 22% had 50% reduction in szs)
Ann Intern Med. 2017;167:319-331. doi:10.7326/M17-0155
Ann Intern Med. 2017;167:332-340. doi:10.7326/M17-0477
Hasin et al. JAMA Psychiatry. doi:10.1001/jamapsychiatry.2015.1858
NESARC 2001 vs 2012 (large epidemiologic survey)
Past year MJ use: 4.1% vs. 9.5%
Past year MJ use disorder: 1.5% vs. 3.0%
• The adolescent brain is especially susceptible to marijuana use.
• When kids use, they have a greater chance of developing addiction.
Wagner, F.A. & Anthony, J.C. , 2002; Giedd. J. N., 2004 Szutorisz et al. Neuropsychopharmacology, 2014
• 1 in 10 adults and 1 in 6 adolescents who try marijuana will become addicted to it.
• Early exposure to cannabis increases risk for later opioid seeking
• Rodents of fathers exposed to THC seek opioids much more than those whose fathers were never exposed
These data are largely based on studies in which THC content was <12%
Adolescent brain development continues until age 25
Children/adolescents at far greater risk for developing addiction
Impact on brain function is greater than in adults Cognition impaired to a greater degree and longer after last use
Poorer educational attainment, greater IQ drops
Impact on brain structure is greater than in adults EC system is central to pruning that occurs in adolescence
Changes in the size and internal structure of multiple areas of the brain, with greater impact when exposure occurs earlier in life
Impact on emotions and reasoning greater than in adults
Impact of Marijuana on Children and Adolescents, CSAM 2009
New Zealand Longitudinal birth cohort N=1265 25 yrs follow-up Fergusson et al. Addiction 2008
Little doubt about association between MJ and psychotic illness (Moore, Zammit et al. 2007; Kuepper, van Os et al. 2011; Large 2011)
Six longitudinal studies in 5 countries: regular MJ use confers twofold risk for later schizophrenia (Zammit, Allebeck et al. 2002)
Cannabis use is also associated with an earlier age at onset of psychotic disorders, particularly schizophrenia (Veen, Selten et al. 2004; Semple, McIntosh et al. 2005)
410 1st episode psychosis vs 370 never-psychotic controls
Andréasson et al Lancet, 1987
0 1 2 10 <50 >50
30
20
10
0
No of times cannabis taken
Ca
ses
of
Sz
pe
r 1,
00
0
4.5
1.6
0
1
2
3
4
5
6
7
8
9
Cannabis users byage 15 years
Cannabis users byage 18 years
Arseneault et al BMJ 2002
Risk of schizophrenia-like psychosis at age 26 years
Od
ds
rati
o
CANNABIS AND SCHIZOPHRENIA Study of Swedish Conscripts (n=45570)
CANNABIS AND SCHIZOPHRENIA-Like Longitudinal prospective Dunedin study (n=1037)
Fact or Fantasy?
Literature is inconsistent regarding long-term, chronic effects, reversibility, etc.
Acute impairment in cognitive function (memory, processing speed, attention) and motor function is not controversial
Studies have had difficulty separating acute from chronic effects
Intoxication and carry-over effects last for hours if not days Pilots impaired 24 hours after smoking one 19 mg joint (Yesavage, AJP 1985)
Abnl EEG, PET, and fMRI findings persist hours and days after MJ use (Ball, Lancet 2009)
WPHP cannabis referrals usually unfit for duty by cog testing
Question: Isn’t brain function important and delicate enough to assume that cannabis, like all other intoxicants, may impair function until proven otherwise?
Courtesy Bertha Madras, PhD, Harvard Medical School
Voluntary
Physicians, Physician Assistants, Advanced Practice Nurses
Requires certifying professionals to enroll in state registry, patients are certified via entry into the registry
Qualifying conditions: cancer, glaucoma, HIV/AIDS, Tourette, ALS, IBS incl Crohn’s, seizures, muscle spasm/MS, terminal illness with life expectancy less than one year, intractable pain
Must have a bona fide medical relationship with patient sufficient to diagnose the qualifying condition, be available for ongoing treatment of the condition, and determine if disability requiring a caregiver is present
Must complete surveys as requested from the OMC
Does not legalize use of plants or edibles (must be oils, capsules, vaporized products)
Eight dispensaries (Minnesota Medical Solutions, LeafLine Labs)
No tax on medical cannabis sales
Can lead to impairment and risks to patient safety
Health habits of professionals predict treatment recommendations and adherence (Frank 2008; Duperly 2009; Frank 2013)
Employers, medical staff bylaws, and malpractice carriers may have prohibitions against use
Cannabis remains federally illegal, schedule I controlled substance
MN law specifically forbids practice under influence of cannabis
Termination for use has been upheld in the courts despite legalization (Colorado Supreme Court, Coats vs. Dish Network, 2015)
Recreational legalization is probably inevitable
How will you maintain your highly regulated medical market in the face of a practical recreational market (botanicals, edibles, etc?).
Protecting tax revenue to meaningfully offset harms through education, early evaluation, and treatment.
What about “safe-limits” for driving or employment?
Who are your most vulnerable populations and how will you protect them?
Cannabis use has well-established serious risks: addiction, psychosis, abnormal adolescent development, cognitive impairment, and motor vehicle accidents.
Medical cannabis is legislated cannabis, not medicine.
Cannabis did not become safer with legalization. It became more dangerous.
Clear heads and science must prevail amidst social and political forces that are motivated only by the desire to liberate recreational use and create markets for profit.
We’ve been down this path with tobacco and opioids. Medicine should not unwittingly collude again.
Chris Bundy, MD, MPH Medical Director Office: 206-583-0127 www.wphp.org