Methanol and ethylene glycol poisoning account for numerous fatalities each year; even minor amounts of these alcohols can be lethal. Awareness is critical, and this must be followed by prompt management, which includes inactivation of ADH.
Epidemiology
Methanol Poisoning:
Sources of Exposure:
Other activities such as manufacturing and the use of chemicals.
The preponderance of contaminated alcoholic beverages.
Automotive items (e. g. Window washing liquid)
Incidence:
Variation in these incidences differs across the regions depending on the level of regulation of the alcohol industry.
Its prevalence is higher in the healthcare facilities lacking strict medical rules and laws, and some determined economical classes.
Ethylene Glycol Poisoning:
Sources of Exposure:
Automotive antifreeze
Industrial solvents
Some household products
Incidence:
Another type of poisoning is not as frequent as methanol poisoning but is not rare, especially in places where many cars are on the road or safety standards are not strictly followed.
The cases of poisoning are reported to be both accidental as well as intentional cases.
Anatomy
Pathophysiology
Methanol Poisoning:
Absorption and Metabolism:
Methanol is rapidly absorbed through the gastrointestinal tract in humans and animals.
It is converted in liver into formaldehyde by the alcohol dehydrogenase (ADH) enzyme and subsequently to formic acid by aldehyde dehydrogenase.
Toxicity:
Thus, the major toxicological metabolite of methanol responsible for its toxic effects is formic acid.
Formic acid has toxic effects on the organism and causes interference with cellular respiration and metabolic acidosis due to the inhibition of cytochrome oxidase.
This acidic build especially in the optic nerve and retina, causes such effects as vision impairment and blindness.
This may or may not be accompanied by other symptoms such as headache, dizziness, nausea, and more serious conditions may involve convulsions, coma, and, in some extreme circumstances, death.
Ethylene Glycol Poisoning:
Absorption and Metabolism:
Like methanol, ethylene glycol is quickly absorbed in the intestinal tract.
It is metabolized by ADH into glycoaldehyde which is further metabolite into glycolic acid, glyoxylic acid and oxalic acid.
Toxicity:
Ethylene glycol is relatively non-toxic but its metabolites such as glycolic and oxalic acid are highly toxic.
Glycolic acid contributes to metabolic acidosis.
Oxalic acid can bind to calcium from calcium oxalate crystals and when these are deposited in the kidneys it causes Acute kidney injury.
Etiology
Methanol Poisoning
Sources: Methanol can be identified in industrial solvents, antifreeze, and some alcoholic preparations. One can poison itself by ingesting methanol or by consuming adulterated alcohol.
Ethylene Glycol Poisoning
Sources: Ethylene glycol is widely used in antifreeze agents, some solvent products, and in formulations of some de-icing solutions. Poisoning results from ingestion is frequent with ingestions, and the leading poison in this category is antifreeze.
Genetics
Prognostic Factors
Clinical History
Physical Examination
Vital signs
Temperature
Neurological Examination
Skin Examination
Skin colour
Ocular Examination
Fundoscopic exam
Age group
Associated comorbidity
Methanol Poisoning:
Comorbidities: One of the serious complications of methanol toxicity is metabolic acidosis, neurotoxicity, and optic neuropathy. Coexisting diseases could be liver and kidney diseases, which worsen the impact of the toxic effects of methanol.
Associated Activities: Methanol is used in industrial solvents and in antifreeze solutions or homemade illicit alcohol. Any activities connection to these substances, including under poorly controlled circumstances or in hazardous environments, raise the risk of poisoning.
Ethylene Glycol Poisoning:
Comorbidities: The effects that are likely to be exhibited by individuals affected by ethylene glycol include metabolic acidosis, acute kidney injury, and neurological manifestations. Having some kidney diseases or diabetes may interfere with the effects of ethylene glycol poisoning.
Associated Activities: The chemical produces antifreeze and specific de-icing solutions. Failure to observe measures when dealing with these substances exposes the patient to risks of accidental consumption of the substances.
Associated activity
Acuity of presentation
Methanol Poisoning
Early Symptoms (6-24 hours): These are: headache, dizziness, nausea and vomiting and abdominal pain. These can also imitate the signs of viral sickness.
Intermediate Symptoms (24-72 hours): It results in visual disturbances such as blurred vision and blindness, confusion, and metabolic acidosis. In severe cases, it may even cause seizures or comas.
Late Symptoms (72+ hours): Advanced cases of metabolic acidosis; ocular side effects; CNS depressant effects. Death can occur due to respiratory arrest or cardiac collapse.
Ethylene Glycol Poisoning
Early Symptoms (0-12 hours): Headache, dizziness, CNS depression (lethargy, ataxia).
Late Symptoms (24-72 hours): Severe anemia, severe acidosis, possible cardiovascular shock, neurological signs (seizures, coma).
Differential Diagnoses
Early diagnosis is vital to reduce the fatality rate and the resultant complications of poisoning. In methanol poisoning, if treatment is not promptly given, it may lead to permanent neurologic deficit and blindness, while in ethylene glycol poisoning, the kidneys are seriously affected. It is most effective if therapy starts as soon as possible after the ingestion of the toxin.
Laboratory Studies
Imaging Studies
Procedures
Histologic Findings
Staging
Treatment Paradigm
Methanol Poisoning
Initial Assessment:
Check the temperature, pulse, respiration, blood pressure, and perform a brief neurologic assessment and the basic head to toe check.
Take a detailed history that is, the time elapsed since exposure, or the amount taken.
Supportive Care:
Stabilise the airway administer supplemental oxygen if necessary and maintain the patient airway and blood pressure.
Decontamination:
If the ingestion is within the past one to two hours, give activated charcoal to minimize further absorption.
Antidote:
Methanol can be metabolized to formaldehyde and formic acid and hence should be accompanied by the administration of fomepizole or ethanol which competes for alcohol dehydrogenase with methanol.
Fomepizole is used because it is more selective and causes fewer side effects.
Supportive Measures:
If metabolic acidosis exists, then an appropriate IV bicarbonate should be given.
Managing cases of disturbing electrolyte levels within the bodies of patients.
Dialysis:
If there is severe Metabolic acidosis, CNS involvement, or high levels of methanol, start hemodialysis to clear methanol and its toxic metabolites expeditiously.
Additional Considerations:
If the patient has severe symptoms or complications that tend to become significant in an ICU, then close monitoring in an ICU is necessary.
Ethylene Glycol Poisoning
Initial Assessment:
In a similar manner to methanol poisoning, evaluation of patient’s vital signs and general physical examination should be done.
Supportive Care:
Protector of airway, breathing, and circulation. Administer what is necessary since the patient has specific symptoms and needs to be frequently monitored.
Decontamination:
If it was ingested within the last one to two hours, give activated charcoal.
Antidote:
Use fomepizole or ethanol to block alcohol dehydrogenase to stop the production of toxic metabolites of ethylene glycol, such as glycolic acid and oxalic acid.
Supportive Measures:
Treat metabolic acidosis with intravenous bicarbonate, if required.
It’s imperative to manage and reassure disruptions of the amounts and distribution of ions in the body.
Dialysis:
Ethylene glycol and its metabolites can be cleared by hemodialysis if there was severe poisoning or when the renal function of the patient is compromised.
Additional Considerations:
It has been shown that intravenous calcium gluconate should be given if hypocalcemia or oxalate crystal deposition is discovered.
Proper Storage: Both methanol and ethylene glycol should be stored in properly labelled, leak-proof containers to deter ingestion. These substances should be avoided in the areas of food and beverages.
Ventilation: These chemicals should be used with adequate ventilation to prevent one from inhaling the vapor that may be produced. Make sure that area in which such chemicals are utilized have proper air circulation.
Safety Protocols: Strong safety measures should however be put in place when dealing with these substances. This involves wearing of correct protective gear such as gloves and goggles and educating people who encounter these chemicals of the dangers and how to deal with them.
Emergency Response: Make sure you have established proper ways of handling with the spills or accidents incidences that may arise out of these chemicals. This includes fomepizole or ethanol should be available since they are antidotes that can be used to treat poisoning by blocking the metabolism of methanol and ethylene glycol.
Regular Monitoring: In the case of the use of such substances, the monitoring and constant maintenance of the safety systems; the ventilation, and proper containment in case of a spillage, can prevent major incidents from taking place in such facilities.
Effectiveness of antidotes in treating Methanol-ethylene-glycol poisoning
Emergency medicine
Fomepizole (Antizol)
Fomepizole is an ethanolamine thickener that acts on alcohol dehydrogenase. It inhibits the formation of methanol’s toxic metabolites, formaldehyde, and formic acid, as well as ethylene glycol’s toxic metabolites, glycolic and oxalic acids.
It is indicated for use in cases of methanol & ethylene glycol consumption thereby making it the first-line treatment. Fomepizole is administered intravenously.
Ethanol
Ethanol is also an alcohol dehydrogenase inhibitor, but it works by competing with methanol and ethylene glycol for the enzyme, thus reducing the formation of toxic metabolites.
Fomepizole can be replaced by ethanol in case it is not available or is not suitable to use. It is intended for intravenous and oral use. It is generally used less frequently than fomepizole, given its apparent greater toxicity as well as the requirement for closer observation.
Use of supplements in treating Methanol-ethylene-glycol poisoning
Assess the patient’s condition: Perform a brief assessment of the patient providing patient care; aspects to cover include vital ABCs, which include checking the airway, breathing, circulation, level of consciousness, and oxygen saturation.
Supportive care: Check if there are any abnormality in the airway, breathing or circulation. Administer oxygen if needed.
Decontamination
Gastric lavage: If the ingestion was within the last couple of hours and the patient is fully orientated and contraindicated when the patient is unconscious or has a danger of aspiration.
Activated charcoal: Given in cases where patient presents within few hours after ingestion and has normal airway.
Antidote Administration
Methanol poisoning:
Fomepizole is preferred; the medication antagonises ethanol, thereby preventing the formation of methanol toxic metabolites.
Ethanol is an alternative in the absence of fomepizole.
Ethylene glycol poisoning:
Fomepizole is also used here.
Fomepizole is used to treat methanol and ethylene glycol poisoning, but in case of its unavailability, ethanol can be used.
Supportive Care and Monitoring
Hydration: Hydration to support renal function and to help support blood pressure.
Electrolyte balance: Supervise and correct any imbalance that may be exhibited.
Monitor for complications: Assess for Laboratory signs of metabolic acidosis, decreased renal function or symptoms referable to the CNS.
Enhanced Elimination
Hemodialysis: Reserve for the severe cases mainly if there is a lot of metabolic acidosis, renal. It aids to quickly cleanse the toxins out of the bloodstream.
Follow-up and Long-Term Care
Monitor for recovery: Make sure that the patient shall overcome the acute phase, and all the complications are addressed.
Psychiatric evaluation: If this poisoning was deliberate, undertake and offer the proper psychosocial intervention.
Dosage modifications
Renal impairment
Dose at the beginning of hemodialysis
The patient should not receive the next dose of fomepizole if it has been less than 6 hours since the last dose. This is because administering the medication too frequently could cause an accumulation of the drug in the body and increase the risk of adverse reactions.
If, on the other hand, it has been six or more hours since the last dose, :
Initial dose:15mg/kg intravenously for 30 mins, followed by 10mg/kg every 12 hours for four doses
Maintenance dose: 15mg/kg intravenously every 12 hours
Initial dose:15mg/kg intravenously for 30 mins, followed by 10mg/kg every 12 hours for four doses
Maintenance dose: 15mg/kg intravenously every 12 hours
»
Home » CAD » Methanol & Ethylene Glycol Poisoning
Methanol & Ethylene Glycol Poisoning
Updated :
August 19, 2024
Methanol and ethylene glycol poisoning account for numerous fatalities each year; even minor amounts of these alcohols can be lethal. Awareness is critical, and this must be followed by prompt management, which includes inactivation of ADH.
Methanol Poisoning:
Sources of Exposure:
Other activities such as manufacturing and the use of chemicals.
The preponderance of contaminated alcoholic beverages.
Automotive items (e. g. Window washing liquid)
Incidence:
Variation in these incidences differs across the regions depending on the level of regulation of the alcohol industry.
Its prevalence is higher in the healthcare facilities lacking strict medical rules and laws, and some determined economical classes.
Ethylene Glycol Poisoning:
Sources of Exposure:
Automotive antifreeze
Industrial solvents
Some household products
Incidence:
Another type of poisoning is not as frequent as methanol poisoning but is not rare, especially in places where many cars are on the road or safety standards are not strictly followed.
The cases of poisoning are reported to be both accidental as well as intentional cases.
Methanol Poisoning:
Absorption and Metabolism:
Methanol is rapidly absorbed through the gastrointestinal tract in humans and animals.
It is converted in liver into formaldehyde by the alcohol dehydrogenase (ADH) enzyme and subsequently to formic acid by aldehyde dehydrogenase.
Toxicity:
Thus, the major toxicological metabolite of methanol responsible for its toxic effects is formic acid.
Formic acid has toxic effects on the organism and causes interference with cellular respiration and metabolic acidosis due to the inhibition of cytochrome oxidase.
This acidic build especially in the optic nerve and retina, causes such effects as vision impairment and blindness.
This may or may not be accompanied by other symptoms such as headache, dizziness, nausea, and more serious conditions may involve convulsions, coma, and, in some extreme circumstances, death.
Ethylene Glycol Poisoning:
Absorption and Metabolism:
Like methanol, ethylene glycol is quickly absorbed in the intestinal tract.
It is metabolized by ADH into glycoaldehyde which is further metabolite into glycolic acid, glyoxylic acid and oxalic acid.
Toxicity:
Ethylene glycol is relatively non-toxic but its metabolites such as glycolic and oxalic acid are highly toxic.
Glycolic acid contributes to metabolic acidosis.
Oxalic acid can bind to calcium from calcium oxalate crystals and when these are deposited in the kidneys it causes Acute kidney injury.
Methanol Poisoning
Sources: Methanol can be identified in industrial solvents, antifreeze, and some alcoholic preparations. One can poison itself by ingesting methanol or by consuming adulterated alcohol.
Ethylene Glycol Poisoning
Sources: Ethylene glycol is widely used in antifreeze agents, some solvent products, and in formulations of some de-icing solutions. Poisoning results from ingestion is frequent with ingestions, and the leading poison in this category is antifreeze.
Vital signs
Temperature
Neurological Examination
Skin Examination
Skin colour
Ocular Examination
Fundoscopic exam
Methanol Poisoning:
Comorbidities: One of the serious complications of methanol toxicity is metabolic acidosis, neurotoxicity, and optic neuropathy. Coexisting diseases could be liver and kidney diseases, which worsen the impact of the toxic effects of methanol.
Associated Activities: Methanol is used in industrial solvents and in antifreeze solutions or homemade illicit alcohol. Any activities connection to these substances, including under poorly controlled circumstances or in hazardous environments, raise the risk of poisoning.
Ethylene Glycol Poisoning:
Comorbidities: The effects that are likely to be exhibited by individuals affected by ethylene glycol include metabolic acidosis, acute kidney injury, and neurological manifestations. Having some kidney diseases or diabetes may interfere with the effects of ethylene glycol poisoning.
Associated Activities: The chemical produces antifreeze and specific de-icing solutions. Failure to observe measures when dealing with these substances exposes the patient to risks of accidental consumption of the substances.
Methanol Poisoning
Early Symptoms (6-24 hours): These are: headache, dizziness, nausea and vomiting and abdominal pain. These can also imitate the signs of viral sickness.
Intermediate Symptoms (24-72 hours): It results in visual disturbances such as blurred vision and blindness, confusion, and metabolic acidosis. In severe cases, it may even cause seizures or comas.
Late Symptoms (72+ hours): Advanced cases of metabolic acidosis; ocular side effects; CNS depressant effects. Death can occur due to respiratory arrest or cardiac collapse.
Ethylene Glycol Poisoning
Early Symptoms (0-12 hours): Headache, dizziness, CNS depression (lethargy, ataxia).
Late Symptoms (24-72 hours): Severe anemia, severe acidosis, possible cardiovascular shock, neurological signs (seizures, coma).
Early diagnosis is vital to reduce the fatality rate and the resultant complications of poisoning. In methanol poisoning, if treatment is not promptly given, it may lead to permanent neurologic deficit and blindness, while in ethylene glycol poisoning, the kidneys are seriously affected. It is most effective if therapy starts as soon as possible after the ingestion of the toxin.
Methanol Poisoning
Initial Assessment:
Check the temperature, pulse, respiration, blood pressure, and perform a brief neurologic assessment and the basic head to toe check.
Take a detailed history that is, the time elapsed since exposure, or the amount taken.
Supportive Care:
Stabilise the airway administer supplemental oxygen if necessary and maintain the patient airway and blood pressure.
Decontamination:
If the ingestion is within the past one to two hours, give activated charcoal to minimize further absorption.
Antidote:
Methanol can be metabolized to formaldehyde and formic acid and hence should be accompanied by the administration of fomepizole or ethanol which competes for alcohol dehydrogenase with methanol.
Fomepizole is used because it is more selective and causes fewer side effects.
Supportive Measures:
If metabolic acidosis exists, then an appropriate IV bicarbonate should be given.
Managing cases of disturbing electrolyte levels within the bodies of patients.
Dialysis:
If there is severe Metabolic acidosis, CNS involvement, or high levels of methanol, start hemodialysis to clear methanol and its toxic metabolites expeditiously.
Additional Considerations:
If the patient has severe symptoms or complications that tend to become significant in an ICU, then close monitoring in an ICU is necessary.
Ethylene Glycol Poisoning
Initial Assessment:
In a similar manner to methanol poisoning, evaluation of patient’s vital signs and general physical examination should be done.
Supportive Care:
Protector of airway, breathing, and circulation. Administer what is necessary since the patient has specific symptoms and needs to be frequently monitored.
Decontamination:
If it was ingested within the last one to two hours, give activated charcoal.
Antidote:
Use fomepizole or ethanol to block alcohol dehydrogenase to stop the production of toxic metabolites of ethylene glycol, such as glycolic acid and oxalic acid.
Supportive Measures:
Treat metabolic acidosis with intravenous bicarbonate, if required.
It’s imperative to manage and reassure disruptions of the amounts and distribution of ions in the body.
Dialysis:
Ethylene glycol and its metabolites can be cleared by hemodialysis if there was severe poisoning or when the renal function of the patient is compromised.
Additional Considerations:
It has been shown that intravenous calcium gluconate should be given if hypocalcemia or oxalate crystal deposition is discovered.
Emergency Medicine
Proper Storage: Both methanol and ethylene glycol should be stored in properly labelled, leak-proof containers to deter ingestion. These substances should be avoided in the areas of food and beverages.
Ventilation: These chemicals should be used with adequate ventilation to prevent one from inhaling the vapor that may be produced. Make sure that area in which such chemicals are utilized have proper air circulation.
Safety Protocols: Strong safety measures should however be put in place when dealing with these substances. This involves wearing of correct protective gear such as gloves and goggles and educating people who encounter these chemicals of the dangers and how to deal with them.
Emergency Response: Make sure you have established proper ways of handling with the spills or accidents incidences that may arise out of these chemicals. This includes fomepizole or ethanol should be available since they are antidotes that can be used to treat poisoning by blocking the metabolism of methanol and ethylene glycol.
Regular Monitoring: In the case of the use of such substances, the monitoring and constant maintenance of the safety systems; the ventilation, and proper containment in case of a spillage, can prevent major incidents from taking place in such facilities.
Emergency Medicine
Emergency medicine
Fomepizole (Antizol)
Fomepizole is an ethanolamine thickener that acts on alcohol dehydrogenase. It inhibits the formation of methanol’s toxic metabolites, formaldehyde, and formic acid, as well as ethylene glycol’s toxic metabolites, glycolic and oxalic acids.
It is indicated for use in cases of methanol & ethylene glycol consumption thereby making it the first-line treatment. Fomepizole is administered intravenously.
Ethanol
Ethanol is also an alcohol dehydrogenase inhibitor, but it works by competing with methanol and ethylene glycol for the enzyme, thus reducing the formation of toxic metabolites.
Fomepizole can be replaced by ethanol in case it is not available or is not suitable to use. It is intended for intravenous and oral use. It is generally used less frequently than fomepizole, given its apparent greater toxicity as well as the requirement for closer observation.
In methanol poisoning, folic acid is useful in the breakdown of formic acid, which is toxic metabolite of methanol into harmless products.
Folic acid or its analogue such as folinic acid may be given to help clear formic acid from the body.
Emergency Medicine
Initial Assessment and Stabilization
Assess the patient’s condition: Perform a brief assessment of the patient providing patient care; aspects to cover include vital ABCs, which include checking the airway, breathing, circulation, level of consciousness, and oxygen saturation.
Supportive care: Check if there are any abnormality in the airway, breathing or circulation. Administer oxygen if needed.
Decontamination
Gastric lavage: If the ingestion was within the last couple of hours and the patient is fully orientated and contraindicated when the patient is unconscious or has a danger of aspiration.
Activated charcoal: Given in cases where patient presents within few hours after ingestion and has normal airway.
Antidote Administration
Methanol poisoning:
Fomepizole is preferred; the medication antagonises ethanol, thereby preventing the formation of methanol toxic metabolites.
Ethanol is an alternative in the absence of fomepizole.
Ethylene glycol poisoning:
Fomepizole is also used here.
Fomepizole is used to treat methanol and ethylene glycol poisoning, but in case of its unavailability, ethanol can be used.
Supportive Care and Monitoring
Hydration: Hydration to support renal function and to help support blood pressure.
Electrolyte balance: Supervise and correct any imbalance that may be exhibited.
Monitor for complications: Assess for Laboratory signs of metabolic acidosis, decreased renal function or symptoms referable to the CNS.
Enhanced Elimination
Hemodialysis: Reserve for the severe cases mainly if there is a lot of metabolic acidosis, renal. It aids to quickly cleanse the toxins out of the bloodstream.
Follow-up and Long-Term Care
Monitor for recovery: Make sure that the patient shall overcome the acute phase, and all the complications are addressed.
Psychiatric evaluation: If this poisoning was deliberate, undertake and offer the proper psychosocial intervention.
Methanol and ethylene glycol poisoning account for numerous fatalities each year; even minor amounts of these alcohols can be lethal. Awareness is critical, and this must be followed by prompt management, which includes inactivation of ADH.
Methanol Poisoning:
Sources of Exposure:
Other activities such as manufacturing and the use of chemicals.
The preponderance of contaminated alcoholic beverages.
Automotive items (e. g. Window washing liquid)
Incidence:
Variation in these incidences differs across the regions depending on the level of regulation of the alcohol industry.
Its prevalence is higher in the healthcare facilities lacking strict medical rules and laws, and some determined economical classes.
Ethylene Glycol Poisoning:
Sources of Exposure:
Automotive antifreeze
Industrial solvents
Some household products
Incidence:
Another type of poisoning is not as frequent as methanol poisoning but is not rare, especially in places where many cars are on the road or safety standards are not strictly followed.
The cases of poisoning are reported to be both accidental as well as intentional cases.
Methanol Poisoning:
Absorption and Metabolism:
Methanol is rapidly absorbed through the gastrointestinal tract in humans and animals.
It is converted in liver into formaldehyde by the alcohol dehydrogenase (ADH) enzyme and subsequently to formic acid by aldehyde dehydrogenase.
Toxicity:
Thus, the major toxicological metabolite of methanol responsible for its toxic effects is formic acid.
Formic acid has toxic effects on the organism and causes interference with cellular respiration and metabolic acidosis due to the inhibition of cytochrome oxidase.
This acidic build especially in the optic nerve and retina, causes such effects as vision impairment and blindness.
This may or may not be accompanied by other symptoms such as headache, dizziness, nausea, and more serious conditions may involve convulsions, coma, and, in some extreme circumstances, death.
Ethylene Glycol Poisoning:
Absorption and Metabolism:
Like methanol, ethylene glycol is quickly absorbed in the intestinal tract.
It is metabolized by ADH into glycoaldehyde which is further metabolite into glycolic acid, glyoxylic acid and oxalic acid.
Toxicity:
Ethylene glycol is relatively non-toxic but its metabolites such as glycolic and oxalic acid are highly toxic.
Glycolic acid contributes to metabolic acidosis.
Oxalic acid can bind to calcium from calcium oxalate crystals and when these are deposited in the kidneys it causes Acute kidney injury.
Methanol Poisoning
Sources: Methanol can be identified in industrial solvents, antifreeze, and some alcoholic preparations. One can poison itself by ingesting methanol or by consuming adulterated alcohol.
Ethylene Glycol Poisoning
Sources: Ethylene glycol is widely used in antifreeze agents, some solvent products, and in formulations of some de-icing solutions. Poisoning results from ingestion is frequent with ingestions, and the leading poison in this category is antifreeze.
Vital signs
Temperature
Neurological Examination
Skin Examination
Skin colour
Ocular Examination
Fundoscopic exam
Methanol Poisoning:
Comorbidities: One of the serious complications of methanol toxicity is metabolic acidosis, neurotoxicity, and optic neuropathy. Coexisting diseases could be liver and kidney diseases, which worsen the impact of the toxic effects of methanol.
Associated Activities: Methanol is used in industrial solvents and in antifreeze solutions or homemade illicit alcohol. Any activities connection to these substances, including under poorly controlled circumstances or in hazardous environments, raise the risk of poisoning.
Ethylene Glycol Poisoning:
Comorbidities: The effects that are likely to be exhibited by individuals affected by ethylene glycol include metabolic acidosis, acute kidney injury, and neurological manifestations. Having some kidney diseases or diabetes may interfere with the effects of ethylene glycol poisoning.
Associated Activities: The chemical produces antifreeze and specific de-icing solutions. Failure to observe measures when dealing with these substances exposes the patient to risks of accidental consumption of the substances.
Methanol Poisoning
Early Symptoms (6-24 hours): These are: headache, dizziness, nausea and vomiting and abdominal pain. These can also imitate the signs of viral sickness.
Intermediate Symptoms (24-72 hours): It results in visual disturbances such as blurred vision and blindness, confusion, and metabolic acidosis. In severe cases, it may even cause seizures or comas.
Late Symptoms (72+ hours): Advanced cases of metabolic acidosis; ocular side effects; CNS depressant effects. Death can occur due to respiratory arrest or cardiac collapse.
Ethylene Glycol Poisoning
Early Symptoms (0-12 hours): Headache, dizziness, CNS depression (lethargy, ataxia).
Late Symptoms (24-72 hours): Severe anemia, severe acidosis, possible cardiovascular shock, neurological signs (seizures, coma).
Early diagnosis is vital to reduce the fatality rate and the resultant complications of poisoning. In methanol poisoning, if treatment is not promptly given, it may lead to permanent neurologic deficit and blindness, while in ethylene glycol poisoning, the kidneys are seriously affected. It is most effective if therapy starts as soon as possible after the ingestion of the toxin.
Methanol Poisoning
Initial Assessment:
Check the temperature, pulse, respiration, blood pressure, and perform a brief neurologic assessment and the basic head to toe check.
Take a detailed history that is, the time elapsed since exposure, or the amount taken.
Supportive Care:
Stabilise the airway administer supplemental oxygen if necessary and maintain the patient airway and blood pressure.
Decontamination:
If the ingestion is within the past one to two hours, give activated charcoal to minimize further absorption.
Antidote:
Methanol can be metabolized to formaldehyde and formic acid and hence should be accompanied by the administration of fomepizole or ethanol which competes for alcohol dehydrogenase with methanol.
Fomepizole is used because it is more selective and causes fewer side effects.
Supportive Measures:
If metabolic acidosis exists, then an appropriate IV bicarbonate should be given.
Managing cases of disturbing electrolyte levels within the bodies of patients.
Dialysis:
If there is severe Metabolic acidosis, CNS involvement, or high levels of methanol, start hemodialysis to clear methanol and its toxic metabolites expeditiously.
Additional Considerations:
If the patient has severe symptoms or complications that tend to become significant in an ICU, then close monitoring in an ICU is necessary.
Ethylene Glycol Poisoning
Initial Assessment:
In a similar manner to methanol poisoning, evaluation of patient’s vital signs and general physical examination should be done.
Supportive Care:
Protector of airway, breathing, and circulation. Administer what is necessary since the patient has specific symptoms and needs to be frequently monitored.
Decontamination:
If it was ingested within the last one to two hours, give activated charcoal.
Antidote:
Use fomepizole or ethanol to block alcohol dehydrogenase to stop the production of toxic metabolites of ethylene glycol, such as glycolic acid and oxalic acid.
Supportive Measures:
Treat metabolic acidosis with intravenous bicarbonate, if required.
It’s imperative to manage and reassure disruptions of the amounts and distribution of ions in the body.
Dialysis:
Ethylene glycol and its metabolites can be cleared by hemodialysis if there was severe poisoning or when the renal function of the patient is compromised.
Additional Considerations:
It has been shown that intravenous calcium gluconate should be given if hypocalcemia or oxalate crystal deposition is discovered.
Emergency Medicine
Proper Storage: Both methanol and ethylene glycol should be stored in properly labelled, leak-proof containers to deter ingestion. These substances should be avoided in the areas of food and beverages.
Ventilation: These chemicals should be used with adequate ventilation to prevent one from inhaling the vapor that may be produced. Make sure that area in which such chemicals are utilized have proper air circulation.
Safety Protocols: Strong safety measures should however be put in place when dealing with these substances. This involves wearing of correct protective gear such as gloves and goggles and educating people who encounter these chemicals of the dangers and how to deal with them.
Emergency Response: Make sure you have established proper ways of handling with the spills or accidents incidences that may arise out of these chemicals. This includes fomepizole or ethanol should be available since they are antidotes that can be used to treat poisoning by blocking the metabolism of methanol and ethylene glycol.
Regular Monitoring: In the case of the use of such substances, the monitoring and constant maintenance of the safety systems; the ventilation, and proper containment in case of a spillage, can prevent major incidents from taking place in such facilities.
Emergency Medicine
Emergency medicine
Fomepizole (Antizol)
Fomepizole is an ethanolamine thickener that acts on alcohol dehydrogenase. It inhibits the formation of methanol’s toxic metabolites, formaldehyde, and formic acid, as well as ethylene glycol’s toxic metabolites, glycolic and oxalic acids.
It is indicated for use in cases of methanol & ethylene glycol consumption thereby making it the first-line treatment. Fomepizole is administered intravenously.
Ethanol
Ethanol is also an alcohol dehydrogenase inhibitor, but it works by competing with methanol and ethylene glycol for the enzyme, thus reducing the formation of toxic metabolites.
Fomepizole can be replaced by ethanol in case it is not available or is not suitable to use. It is intended for intravenous and oral use. It is generally used less frequently than fomepizole, given its apparent greater toxicity as well as the requirement for closer observation.
In methanol poisoning, folic acid is useful in the breakdown of formic acid, which is toxic metabolite of methanol into harmless products.
Folic acid or its analogue such as folinic acid may be given to help clear formic acid from the body.
Emergency Medicine
Initial Assessment and Stabilization
Assess the patient’s condition: Perform a brief assessment of the patient providing patient care; aspects to cover include vital ABCs, which include checking the airway, breathing, circulation, level of consciousness, and oxygen saturation.
Supportive care: Check if there are any abnormality in the airway, breathing or circulation. Administer oxygen if needed.
Decontamination
Gastric lavage: If the ingestion was within the last couple of hours and the patient is fully orientated and contraindicated when the patient is unconscious or has a danger of aspiration.
Activated charcoal: Given in cases where patient presents within few hours after ingestion and has normal airway.
Antidote Administration
Methanol poisoning:
Fomepizole is preferred; the medication antagonises ethanol, thereby preventing the formation of methanol toxic metabolites.
Ethanol is an alternative in the absence of fomepizole.
Ethylene glycol poisoning:
Fomepizole is also used here.
Fomepizole is used to treat methanol and ethylene glycol poisoning, but in case of its unavailability, ethanol can be used.
Supportive Care and Monitoring
Hydration: Hydration to support renal function and to help support blood pressure.
Electrolyte balance: Supervise and correct any imbalance that may be exhibited.
Monitor for complications: Assess for Laboratory signs of metabolic acidosis, decreased renal function or symptoms referable to the CNS.
Enhanced Elimination
Hemodialysis: Reserve for the severe cases mainly if there is a lot of metabolic acidosis, renal. It aids to quickly cleanse the toxins out of the bloodstream.
Follow-up and Long-Term Care
Monitor for recovery: Make sure that the patient shall overcome the acute phase, and all the complications are addressed.
Psychiatric evaluation: If this poisoning was deliberate, undertake and offer the proper psychosocial intervention.
Both our subscription plans include Free CME/CPD AMA PRA Category 1 credits.
Digital Certificate PDF
On course completion, you will receive a full-sized presentation quality digital certificate.
medtigo Simulation
A dynamic medical simulation platform designed to train healthcare professionals and students to effectively run code situations through an immersive hands-on experience in a live, interactive 3D environment.
medtigo Points
medtigo points is our unique point redemption system created to award users for interacting on our site. These points can be redeemed for special discounts on the medtigo marketplace as well as towards the membership cost itself.
Community Forum post/reply = 5 points
*Redemption of points can occur only through the medtigo marketplace, courses, or simulation system. Money will not be credited to your bank account. 10 points = $1.
All Your Certificates in One Place
When you have your licenses, certificates and CMEs in one place, it's easier to track your career growth. You can easily share these with hospitals as well, using your medtigo app.
