MRCPsych Paper B - Addiction Flashcards
Average heroin use per in a day of a typical dependent user
0.25-2.0g/ day
Preferred maintenance treatment for opioid use disorder
Buprenorphine
3 main types of pharmacotherapy in opioid withdrawal symptom
- Methadone at tapered doses
- Buprenorphine
- a2 adrenergic agonists - lofexidine, clonidine
Tolerance to this symptom does not usually develop with long-term opiate use
constipation
Intervention with the most consistent evidence base among all psychosocial interventions for cocaine users
Contingency management
Most common side effects of benzodiazepines
drowsiness, ataxia, dizziness
ICD-11 term that denotes a state in which alcohol has caused damage to a person’s physical and mental health, without meeting the criteria for dependence
Harmful pattern of use
Most commonly used illicit opioid in Europe
heroin
Acute harmful effects of LSD (2 answers)
Behavioral toxicity, bad trips
NICE guidelines: first choice treatment for opioid dependence
Methadone → buprenorphine
Most common cause of death in benzodiazepine overdose
respiratory depression
LSD can be detected in the urine for up to how many days
4 days
Initial treatment period for nicotine replacement therapy
8-12 weeks
Kinaesthetic hallucinations are reported incases with
benzodiazepine withdrawal
*patients feel that their limbs are being twisted, pulled, or moved
NICE recommendation: atypical antidepressant for smoking cessation
Bupropion
*seizure risk 1:1000
Opioid injection practice that is associated with Candida enophthalmitis
using lemon juice to reconstitute
Main side effect of varenicline
nausea
Most effective smoking cessation pharmacotherapy in the general population
Varenicline
Percentage of UK men aged 55-64 that drinks over 14 SD per week
38%
Lifetime risk of suicide in those with alcohol dependence drinkers
10-15%
Lifetime risk of suicide in those with alcohol problems
4%
Cerebellar degeneration has been reported to occur in up to what percentage of alcoholics
33%
Most common CNS complication in alcoholics with and without micronutrient deficiencies
Cerebellar degeneration
*damage is irreversible
Reducing regime management for alcohol withdrawal: typical duration of chlordiazepoxide to be given
5-7 days
*Chlordiazepoxide 10-20mg QID, reducing gradually over 5-7 days
Classic triad of delirium tremens
clouding of consciousness/ confusion
vivid hallucinations
marked tremors
Onset of delirium tremens
72-96 hours after last drink
Discrete episodes of anterograde amnesia that occur in association with alcohol intoxication
Alcoholic blackouts/ alcohol induced amnesia/ palimpsest
Percentage of alcoholic patients that experience alcoholic hallucinosis with abstinence
5%
Medication avoided for outpatient assisted withdrawal from alcohol due to the risk of respiratory depression
Chlormethiazole
Edwards & Gross criteria for alcohol dependence
- Narrowing of the drinking repertoire
- Salience/ primacy of alcohol-seeking behaviour
- Increased tolerance
- Repeated withdrawal symptoms
- Relief or avoidance of withdrawal symptoms by further drinking
- Subjective awareness of compulsion to drink
- Reinstatement after abstinence
Mortality rate of delirium tremens
1-15%
Alcohol detoxification protocol: patient with liver disease, COPD, and want to avoid over-sedation
Oxazepam
*shorter-acting benzodiazepine
Opioid receptor antagonist that is effective in blocking the high of alcohol
Naltrexone
Common side effect reported by patients for disulfram
halitosis & headache
Wernicke encephalopathy: gliosis and small haemorrhages in which brain region
Mamillary bodies
*accounts for wakefulness, hypertonia, ocular palsies
General finding in the MATCH trial
Matching patients to treatment options does not make a significant impact on outcome
*Motivational therapy vs social behaviour and network therapy
Alcohol withdrawal symptoms usually subside within how many days after cessation
3-7 days
NICE guidelines: inpatient opioid detoxification with buprenorphine lasts for how many days
7-14 days
NICE guidelines: inpatient opioid detoxification with methadone lasts for how many days
14-21 days
NICE recommendations: most suitable screening tool in primary care settings in detecting hazardous and dependent drinking
Alcohol use disorders identification test (AUDIT)
Alcohol withdrawal symptom timeline
Time from last drink:
3-12 hours - mild symptoms
12-18 hours - generalized seizures
24-48 hours - peak symptoms
3-4 days - delirium tremens
can last up to 14 days
Minimum interval from last drink when starting disulfram
24 hours
Time to normalize on abstinence: blood alcohol levels/ breathalyzer
6 hours in blood, 12-24 hours in breath
*useful in assessing recent drinking
Time to normalize on abstinence: GGT
4 weeks
*best used in follow-up
Time to normalize on abstinence: MCV
3-6 mos
*best used inf follow-up
Time to normalize on abstinence: ALT/ AST
4 weeks
Time to normalize on abstinence: carbohydrdate-deficient transferrin (CDT)
4 weeks
Case: treatment for pregnant woman who is opioid dependent
Methadone
Investigations: CBC findings in alcohol use disorder
anaemia, thrombocytopenia, neutropenia, raised MCV (macrocytosis)
Opioid overdose triad
unconsciousness, low RR, pin-point pupils (miosis)
Case: management of opioid-dependent women
stabilization on substitute methadone
Case: which medication to give - pregnant woman + heavy user of heroin + plan on breastfeeding
methadone or buprenorphine
Case: highly motivated opioid user who wants to remain abstinent and follow-up appointments + supportive partner
Naltrexone
Case: heroin user + unsuccessful trial of methadone and buprenorphine (opioid substitution treatment). Next best treatment option?
injectable diamorphine
Case: man being treated for heroin addiction + “running out of methadone” + demanding treatment. What is the best course of action?
Optimise the dose of methadone
Case: physically dependent on dihydrocodeine for low back pain + wants to stop and go back to work. What is the best course of action?
Withdraw codeine gradually.
*opioids are harmful in the treatment of low back pain. Dont prescribe opioids for long term treatments.
Case: Patient keen on stopping heroin + anxious about withdrawal symptoms. Which is best suited to support detoxification?
Methadone
*Buprenorphine is a partial agonist therefore a precipitated withdrawal may occur
Percentage of schizophrenia that use nicotine
70-80%
Case: adult man + unable to cut down due to withdrawal symptoms + low mood, anhedonia, fatigueability. What would be the most appropriate treatment option?
Alcohol detoxification
Indications for alcohol detoxification
regular consumption of 15+ units/day
AUDIT >20
history of significant withdrawal symptoms
Case: 55yo man with opioid dependence + considering pharma maintenance treatment along with psychosocial interventions. What is the most appropriate medication would be?
NICE guidelines: maintenance therapy - methadone & buprenorphine
Type of memory that is most affected in Korsakoff syndrome
Episodic memory
Case: polysubstance user complaining of frequent urination and hematuria. What is the most likely offending drug?
Ketamine
*UTI
Signs of advanced opioid withdrawal state
Muscle spasms and twitching
Investigation: sensitive marker of alcohol abuse
GGT
Investigation: alcohol abuse test that accurately predicts RECENT alcohol use and can be useful in detecting relapse
Carbohydrate deficient transferrin (CDT)
Investigation: alcohol abuse test that is more specific but less useful in detecting relapse
MCV
*RBC’s life span is 120 days. range is too big to assess for relapse
Investigation: best alcohol use disorder screening tool in primary care
AUDIT
Investigation: part of the routine assessment of patients in follow-up under a supervised detoxification programme
Breathalyser
Investigation: most widely used screening tool for alcoholism but does not ask for frequency of alcohol use
CAGE
Investigation: brief structured interview for alcohol use disorder for general practice use
AUDIT
Investigation: tool for detecting dependent drinkers + focus on lifetime alcohol related problems
Michigan Alcohol Screening Test (MAST)
Investigation: shorter version of AUDIT
Fast alcohol screening test (FAST)
Case: adult alcoholic + abstinent + motivated
disulfram