alcohol withdrawal - the ixth · pdf fileno comparison of atenolol with diazepam ... alcohol...
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1
Alcohol Withdrawal
Lewis R. Goldfrank, MD
Professor and Chairman, Emergency Medicine
New York University School of Medicine
Director, Emergency Medicine
Bellevue Hospital/NYU Hospitals/VA Hospital
Medical Director, New York City Poison CenterSorrento, Italy (September 19, 2007)
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Alcoholism
2
Third largest health problem in the US
� After ASHD and cancer
Affects at least 10 million people
Causes 200,000 deaths annually
Implicated in 50% of MVC and fires, 67% of homicides and 37% of suicides
Annual cost at least $60 billion
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History of Alcoholism at Bellevue
3
256,755 admission from 1902-1935Peak admissions 4.99/1000 population/yearMale:female about 4:1� Jolliffe: Science 1936;83:306-309
Currently, 25% of patients brought to the ED by ambulance are alcoholics� Whiteman: Acad Emerg Med
2000;7:14-20
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Ethanol and the CNS
Changes “fluid” properties of lipid membranes (?)
Augments GABA mediated inhibition� Chronic use of ethanol results in down-
regulation of the number and sensitivity at the GABA receptor chloride channel complex
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Problems With The GABA Model
Cross tolerance between ethanol and GABA agonists is not perfect� Administration of ethanol to patients in
withdrawal results in normalization of mental status.
� Administration of GABA agonists to patients in withdrawal results in sedation
This suggests other neurotransmitter system(s) are involved
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Ethanol and Excitatory Amino Acids
Ethanol inhibits NMDA. (N-methyl-d-aspartate)� Chronic use of ethanol increases the number of
NMDA receptors. (Family of glutamate receptors
Ethanol withdrawal results in excess NMDA activity.� Can be blocked by dizocilpine (MK-801).
Hoffman: Ann NY Acad Sci 1992;654:526
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Ethanol Withdrawal
Down-regulation of GABA� Decreased ability to inhibit
Up-regulation of NMDA� Increased ability to excite
Net result: Hyperadrenergic condition
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Alcohol Abstinence Syndromes
Analyzed consecutive admissions to Boston City Hospital related to alcohol abuse.
Collected 266 patients over 60 days.
Characterized presentations
Victor and Adams: Res Pub Assoc Res Nerv Ment Dis 1953;32:526.8
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Number Percent
Acute alcoholic tremulousness 92 34.6
Acute intoxicationIntoxicationStupor or comaCombative
56 14 27 15
21
Rum fits 32 12
Tremor and transitory hallucinations 30 11.1
Typical delirium tremens 14 5.3
Atypical delirious-hallucinatory 11 4.1
Wernicke-Korsakoff 8 3
Acute auditory hallucinosis 6 2.3
Other 42 18
Victor and Adams: Res Pub Assoc Res Nerv Ment Dis 1953;32:526.9
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Decreasing Alcohol Level
Alcoholic TremulousnessHypertensionTachycardiaHyperthermia
TremorDiaphoresis
Delirium Tremens
Withdrawal Seizure Alcoholic Hallucinosis
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Alcoholic HallucinosisKrapelin’s Hallucinatory Insanity
Hallucinations� Often auditory
� Often persecutory
Orientation intact
Transient in nature
Not necessarily associated with tremulousness
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Rum Fits
Tonic clonic seizure
May be multiple� Status epilepticus uncommon
� Short postictal period
Not preceded by tremulousness
May progress to DTs
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Onset of Seizures
0
5
10
15
20
25
30
35
40
0-6 7-12 13-18 19-24 25-30 31-36 37-42 43-48 49-54 55-60 61-65 >65
Hours from last drink
Num
ber
of
Se
izur
es
13
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Number of Seizures
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6 7-12 Status
# of seizures
Num
ber
of
Pa
tient
s
14
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Time Between First and Last Seizure
0
10
20
30
40
50
60
70
<6 8 9 10 12 20 96 120
Time in hours n=77
Num
ber
of
Pa
tient
s
15
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Delirium Tremens
All manifestations of alcoholic tremulousnessAutonomic instabilityDisorientationHigh case fatality rate� Osler, 1916: 14%� Philadelphia General, 1950: 5.4%� Today?
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Onset of DTs
0
2
4
6
8
10
12
14
16
18
<24 24-48 49-72 73-96 >96
Last DrinkHospitalized
Time in hours
Pe
rce
nta
ge
of P
atie
nts
17
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Duration of DTs
0
5
10
15
20
25
30
<24 25-48 49-72 73-96 >96
Time in hours
Pe
rce
nta
ge
of P
atie
nts
18
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Causes of Death
Hyperthermia
Fluid and electrolyte abnormalities
Infection� Occult cause of withdrawal
� Aspiration secondary to seizures or over-sedation
Cardiovascular (especially in the elderly)
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Delirium Tremens DogmaNo one should be given the diagnosis of DTs
without first receiving a Head CT and an LP.
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Treatment
General Supportive care� Intravenous fluids� Glucose, thiamine
� Other water soluble vitamins
� ECG� Combined with blood tests to r/o Ca++, Mg++, K+
abnormalities� Ethanol level
� Exclude occult infections and trauma
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Benzodiazepine Dosing
Choice of benzodiazepines� Intravenous vs oral
� Active metabolites vs. inactive metabolites
� Rapidity of onset
� PRN vs. standing orders
� All decisions favor intravenous diazepam
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Chlordiazepoxide
Blum: J Toxicol 1976;3:42723
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Benzodiazepine Loading
Give intravenous doses in rapid succession based on the pharmacokinetics of the agent until the patient becomes somnolent� Manikant: Ind J Med Res 1993;98:170
Very high doses may be required (2640 mg in 48h) � Nolop: Crit Care Med 1985;13:246
Follow with PRN dosing only
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Neuroleptics
Not cross tolerant with ethanol
Interfere with the ability to dissipate heat
Lower the seizure threshold
Exacerbate autonomic instability
Associated with bad outcomes when used in humans
Greenblatt: J Clin Psych 1978;39:673
Greenland: Am J Psych 1978;135:123425
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Haloperidol
Blum: J Toxicol 1976;3:42726
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Individualized Treatment
101 withdrawal patientsRandomized double-blind controlFixed dose of chlordiazepoxide vs PRN dosing� Placebo given to maintain blinding
Outcome measures� Duration of treatment� Total dose of benzodiazepine
Saitz: JAMA 1994;272:51927
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Results
Duration of treatment: � 9 hours in PRN group vs 68 hours in fixed dose group
(p<0.01)
Total benzodiazepine dose:� 100 mg in the PRN group vs 425 mg in the fixed dose
group (P<0.01)
Similar withdrawal severity, seizure incidence, and DTs� Trends favor PRN group
Saitz: JAMA 1994;272:51928
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Symptom Triggered Therapy
216 admissions for withdrawal
Retrospective comparison of outcome before and after symptom triggered therapy� Benzodiazepine dose
� Duration of therapy
� Progression to DTs
Jaeger TM: Mayo Clin Proc 2001;76:695-70129
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Outcome Before AfterDuration of therapy (h)
Mean
Median
55.5
38.9
44.9
31.8
Total Bz Dose (mg)
Mean
Median
20.1
10.8
20.1
9.0
Progression to DTs (%) 20.5 6.9
Death (%) 2.4 0.0
Any complication (%) 32.5 17.630
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Sullivan JT, et al. Br J Addict 84:1353-1357, 1989.
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Role of Magnesium
Ethanol use results in hypomagnesemia� Poor intake
� Malabsorption
� Renal tubular wasting syndrome
Hypomagnesemia resembles ethanol withdrawal
Magnesium is an NMDA antagonist
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Role of Magnesium in Withdrawal
Randomized double-blind study in 100 alcoholics
4 IM injections of 2g of MgSO4 q6h or NS
All got benzodiazepines as needed
3 observers rated withdrawal scores
No difference between groups with regard to� withdrawal score
� total benzodiazepine dose
Wilson: Alcoholism 1984;8:54233
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Who Should Get Magnesium
Patients with documented hypomagnesemiaPatients with prolonged QT on ECGPatients with hypocalcemiaDelirium Tremens?Other??
Check renal function before giving multiple doses
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Beta Adrenergic Blockade
Randomized double-blind trial in 88 patients with outpatient ethanol withdrawal� Atenolol vs placebo
Atenolol improved vital signs, decreased craving
One seizure patient in atenolol group needing hospitalization, no seizures in placebo� Suggest that the withdrawal was not very severe
No comparison of atenolol with diazepam
Horowitz: Arch Intern Med 1989;149:108935
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Clonidine for Acute Withdrawal
61 men admitted to a detox unit
Double-blind comparison of clonidine 0.2 mg TID vs chlordiazepoxide 50 mg TID
Alcohol withdrawal scores compared over 4 day study period.� Comprised of BP, pulse, RR, tremor,
diaphoresis, and restlessness
Baumgartner: Arch Intern Med 1987;147:122336
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Benzodiazepine Failures
Failure of or insufficient cross tolerance� Large doses in short periods of time
� No accepted definition of large or short � > 400 mg of diazepam in 24 hours?
Hack JB. J Toxicol Clin Toxicol37
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Benzodiazepine Failures
Barbiturates� Advantage: Work well
� Disadvantage: Respiratory depression
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Benzodiazepine Failures
Phenobarbital� IM or IV� Long half-life, preferable� But: too slow in onset for very ill patients
Pentobarbital� Rapid acting IV� Easily titrated continuous infusion� But:
� Respiratory depression common� Bioaccumulates
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Propofol
GABA agonist
NMDA antagonist
Rapidly acting
Ease to titrate
Supported by case reports
But: majority require intubationMcCowan: Crit Care Med 2000;28:1781-1784Coomes: Ann Emerg Med 1997;30:825-828Olmedo: J Toxicol Clin Toxicol 2000;38:537
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McCowan: Crit Care Med 2000;28:1781-1784
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Summary
42
Don’t forget the differential diagnosis
Differentiate mild from severe withdrawal
Be aggressive with benzodiazepines� IV diazepam preferred
� No “Librium tapers” for more than mild withdrawal
For benzodiazepine-resistent withdrawal� Phenobarbital
� Propofol