Chloral hydrate toxicity: Difference between revisions
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*Binds GABA-A receptor | *Binds GABA-A receptor | ||
*Active metabolite trichloroethanol (TCE) | *Active metabolite trichloroethanol (TCE) | ||
*Sometimes still used in pediatrics for children undergoing procedures | |||
*Rarely used in practice in adult medicine | |||
*‘Mickey Finn’ most commonly refers to a mixture of ethanol and chloral hydrate, aka a "knockout drink." | *‘Mickey Finn’ most commonly refers to a mixture of ethanol and chloral hydrate, aka a "knockout drink." | ||
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==Management== | ==Management== | ||
''Generally supportive care'' | ''Generally supportive care'' | ||
*Airway management | *Airway management with intubation and ventilation for CNS depression | ||
*BP monitoring | *BP monitoring | ||
**IVF | **IVF | ||
**Avoid catecholaminergic [[vasopressors]] | |||
*Monitor for dysrhythmias | *Monitor for dysrhythmias | ||
**Treat with beta-blockers to include [[esmolol]] infusion, [[metoprolol]], or [[propanolol]]<ref>Zahedq A, Grant MH, Wong DT. Successful treatment of chloral hydrate cardiac toxicity with propranolol. American Journal of Emergency Medicine 1999; 17(5):490-491.</ref> | |||
**Give or titrate BB until response | |||
*Decontamination not useful for isolated chloral hydrate ingestions due to rapidl absorption | *Decontamination not useful for isolated chloral hydrate ingestions due to rapidl absorption | ||
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==External Links== | ==External Links== | ||
*See [http://lifeinthefastlane.com/tox-library/toxicant/anaesthetics/chloral-hydrate/ life in the fast lane's Chloral hydrate toxicity page] | |||
==References== | ==References== | ||
<references/> | <references/> | ||
[[Category:Toxicology]][[Category:Pharmacology]] | [[Category:Toxicology]][[Category:Pharmacology]] | ||
Revision as of 03:00, 28 February 2017
Background
- Sedative-hypnotic used for insomnia
- Binds GABA-A receptor
- Active metabolite trichloroethanol (TCE)
- Sometimes still used in pediatrics for children undergoing procedures
- Rarely used in practice in adult medicine
- ‘Mickey Finn’ most commonly refers to a mixture of ethanol and chloral hydrate, aka a "knockout drink."
Pharmacokinetics
- Onset: 30-60 min[1]
- Duration: 4-8 hr
- Half-Life: 5 mins (for chloral hydrate)
- 8-11 hr (active metabolite)
- Metabolism: Hepatic metabolism
- Excretion: Mostly in urine; some feces
- Potential toxic dose
- <6 years old: 50mg/kg
- Adults: 3-10g
Clinical Features
Similar to barbiturates and hydrocarbons[2]
- Neuro
- Sedation, ataxia, coma
- GI
- Erosive gastritis, upper gastrointestinal bleeding, strictures
- Hepatitis
- Breath smells like pears
- Renal
- Nephrotoxicity, proteinuria
- CV
- Hypotension
- Myocardial depression
- Tachydysrhythmias secondary to catecholamine hypersensitivity: Sinus tachycardia, PVCs, ventricular tachycardia, ventricular fibrilation, Torsades
- Resp
- Resp depression, airway obstruction (from muscle relaxation)
- Aspiration pneumonitis
Differential Diagnosis
Sedative/hypnotic toxicity
- Absinthe
- Barbiturates
- Benzodiazepines
- Chloral hydrate
- Gamma hydroxybutyrate (GHB)
- Baclofen toxicity
- Opioids
- Toxic alcohols
- Xylazine toxicity
Evaluation
Evaluation
- Clinical diagnosis
Workup
- ECG: Dysrhythmias
- CXR: Pneumonitis or pulmonary edema
- LFTs: monitor for hepatic injury
- BUN/Cr: monitor for renal injury
- Troponin: Myocardial injury
- Consider endoscopy
Management
Generally supportive care
- Airway management with intubation and ventilation for CNS depression
- BP monitoring
- IVF
- Avoid catecholaminergic vasopressors
- Monitor for dysrhythmias
- Treat with beta-blockers to include esmolol infusion, metoprolol, or propanolol[3]
- Give or titrate BB until response
- Decontamination not useful for isolated chloral hydrate ingestions due to rapidl absorption
- Assume corrosive GI injury until ruled out.
Disposition
Asymptomatic
- Observe for 4 hours
Symptomatic
- Admit for monitoring
- GI: Endoscopy within 24 hrs
- CV: Telemetry
See Also
External Links
References
- ↑ Medscape: Chloral hydrate
- ↑ Whyte IM. Chapter 140 Miscellaneous Anziolytics, Sedatives and Hypnotics; in Dart R, Medical Toxicology (3rd edition), Philadelphia: Lippincott Williams and Wilkins, 2004.
- ↑ Zahedq A, Grant MH, Wong DT. Successful treatment of chloral hydrate cardiac toxicity with propranolol. American Journal of Emergency Medicine 1999; 17(5):490-491.