agitation after an overdose author dr vember ng august, 2013 hkcem college tutorial
TRANSCRIPT
Agitation after an
overdoseAUTHORDr Vember NgAugust, 2013
HKCEM College Tutorial
Triage Findings at 20:37
▪ M/27 ▪ Found running on the street▪ Confusion ? Drunk
▪ BP 180/95, P 180/min, ▪ RR 28/min, SpO2 95% in RA, ▪ Temp 40.6oC axilla▪ GCS 11/15 with E2V4M5, pupils dilated
▪ Past Health : unknown
Physical Findings
▪ Agitated, generalized muscle twitching▪ Dehydrated▪ GCS E2V4M5, pupils 4mm
▪ Chest: clear, ▪ Abd: soft non-tender▪ CVS: HS dual no murmur
▪ List out the problems Fever Tachycardia Altered LOC, confusion, agitation
▪ List out the Ddx. e.g. AEIOU TIPS
Ddx
▪ Drug toxicity▪ Infection, encephalitis, meningitis▪ Heat stroke & heat exhaustion▪ Neuroleptic malignant syndrome▪ Hyperthyroidism, thyroid storm
What is your immediate management?
What immediate investigations will you order?
▪ ABC
▪ Restraint (Physical/ Chemical)
▪ Hstix 6.7
▪ CXR : lungs clear, no cardiomegaly
▪ ECG
ECG
What is your further management ?
Any other investigations ?
Any other tests may be useful ?
▪ ABG▪ Electrolyte▪ CK (rhabdomyolysis)▪ Baseline L/RFT, CBC, cardiac enzymes▪ CT Brain▪ Toxicology screen▪ Bedside urine immunoassay kit (e.g. ACON) ▪ AXR (possibility of body packer)
Bedside urine immunoassay kit (e.g. ACON)
▪MET (Methamphetamine) Positive
▪ Interpretation? Positive results are generally expected up to
several days after their uses Clinical utility of bedside kit is limited as both
false positive or false negative are common
Management in AED
▪ ABC +/- Intubation +/- GI decontamination▪ Oxygen▪ IVF▪ Passive cooling (How?)▪ Physical Restraint▪ Chemical Restraint▪ How about tachycardia ? (Use of beta-blocker?)▪ ICU consultation
Chemical Restraint
▪Which Drugs ?
▪Which Benzodiazepine ?
▪ Dose?
▪ Any other alternatives ?
▪ Is it safer to use more physical restraint instead of high dose sedation ?
Progress
▪ Diazepam 10mg IVI was given
▪ Still grossly agitated
▪What will you do next?
Progress
▪ Another Diazepam 20mg IVI was given
▪ Still grossly agitated
▪What will you do next?
▪ If further Diazepam up to 100mg given,
▪What will you do next ?
▪ Consider, e.g. - More Diazepam- Midazolam infusion- Lorazepam- Morphine- Propofol infusion- RSI…..
Progress of our patient
▪ Clinically improving after diazepam 50mg given ▪ No need for intubation (AC not given)
▪ AXR: no FB seen
▪ Cr up to 199, CK 10324, Urine myoglobin +ve▪ Vigorous IVF given
The next day ▪ regained full consciousness ▪ Upon re-questioning, patient admitted that he had taken
some “ice” before collapse
Drug Abuse
Drug of Abuse (Conventional)
Types Examples
CNS Stimulants Amphetamines and its derivativesCocaine / Crack cocaine
CNS Depressants BenzodiazepinesOrganic solvent inhalationOpioids Gamma-Hydroxybutyrate (GHB)EthanolBarbiturates
Dissociatives KetamineDextromethorphan (e.g. cough mixture)Phencyclidine
Hallucinogens CannabisAnticholinergicsLysergic acid diethyamide (LSD)
Emerging Drug of Abuse
▪ Designer drugs, a major component of emerging drug abuse, are drugs produced by illicit chemists to avoid existing drug laws▪ By preparing analogs or derivatives of existing drugs, or less commonly by
finding drugs that mimics the illegal drug effect
▪ Pharmacology, toxicokinetics & toxicodynamics are not well characterized
▪ Difficult to predict the toxicities & the risks involved with their use are often unknown. These drugs are usually more dangerous.
▪ Clinical experience in managing these drugs poisoning is limited
Emerging Drug of Abuse
Types Group Examples
Stimulants • Piperazine-based • Cathinone derivatives
• TFMPP (3-trifluoromethylphenylpiperazine)• BZP (1-benzylpiperazine)• MDPV (Methylenedioxypyrovalerone )• Mephedrone (4-methylmethcathinone)
Hallucinogens • Tryptamine-based • Phenethylamine-based • Ketamine-like• Synthetic Cannabinoids
• 5-methoxy-di-isopropyltryptamine• Mescaline• Methoxetamine• Spice / K2
Others • Salvia divinorum (Salvinorin A)• Poppers (Alkyl Nitrite)
Amphetamines and its derivatives
>200 amphetamine derivatives or amphetamine-like substances
冰 凍嘢( 甲基安非他命 ))
E 仔 , 糖
Methamphetamine
▪ A common recreational drug abused for its stimulant and euphoric effects
▪ The commonest form is crystal, but it can be formulated into “ectasy-like pills” or in the liquid form
▪ Street names include 冰 , ice, crystal meth, speed, crank etc.
▪ The commonest administrative route is smoked through an under-water bottle, however it can be snorted, orally taken, injected and even used per rectal.
Methamphetamine
路德會青怡中心提供
©LutheranEvergreenCentre
“僕”冰
Methamphetamine
▪ Primary mechanism of action - release of endogenous monoamines (e.g. noradrenaline, serotonin and
dopamine), resulting in sympathomimetic poisoning and psychomotor agitation
▪ Different amphetamines and its derivatives have different potencies
▪ Rapidly absorbed from GI tract, nasal mucosa and respiratory tract, mainly metabolized by liver and excreted in urine
▪ Typically, inhalational and parenteral injection routes give faster and more intense effects than ingestion. The effects usually occur within mins. Acute effects may last > 24 hrs
Clinical Features▪ Classical sympathomimetic toxidrome: ▪ psychomotor agitation, tachycardia, hypertension, diaphoresis, mydriasis
and hyperthermia
Reported major end-organ toxicity:
▪ CNS : Seizure, intracranial bleeding, TIA, infarct.
▪ CVS : ACS, hypertensive emergencies, acute aortic syndrome, arrhythmias, vasospasm
▪ Respiratory :Pneumothorax, pneumomediastinum
▪ Psychiatric: Aggression, paranoid psychosis, mood disturbances
▪ Others : Serotonin syndrome, hyponatremia, hyperthermia, DIC, rhabdomyolysis, ARF, met-bug (delusion of parasitosis)
Management
▪ Rapid “Cooling”, use of benzodiazepines and supportive measures are the mainstay of treatment
▪ Consider GI decontamination if presented promptly after an oral overdose
▪ Rapid cooling measures for hyperthermia
▪ Adequate hydration & other supportive measures
Treatment for agitation
▪ Liberal use of benzodiazepines in titrated manner- Start with 5-10mg diazepam IVI- From experience, 1-2 mg/kg diazepam or its equivalent in the
first 30 min may be required to achieve adequate control of agitation.
▪ Prolonged physical restrain without chemical restrain is dangerous
▪ Closely monitor for rhabdomyolysis and hyperthermia
▪ Antipsychotics use in control of agitation in intoxication of amphetamines are generally NOT recommended
Treatment for seizure
▪ Benzodiazepine
▪ Phenytoin is NOT recommended
▪ Rule out hyponatriemia & intracranial pathology
Treatment for hypertensive emergencies
▪ Benzodiazepine and “calm down” the patient is the 1st line treatment
▪ Titrate with short acting nitrate e.g. nitroprusside▪ Consider phentolamine if inadequate response
▪ Beta-blockers should be avoided since unopposed alpha-adrenergic properties may lead to hypertensive crises
END