Solvents toxic

Test your knowledge about solvents, including their lipophilicity, volatility, and routes of exposure. Explore the use of solvents to dissolve, dilute, or disperse materials.

Created by
@WholesomePond

Questions and Answers

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Which route is the major route of solvent exposure?

Inhalation

What happens to the lipophilicity of solvents with increasing molecular weight?

It increases

What are solvents frequently used for in relation to materials?

To dissolve, dilute, or disperse insoluble materials

Which property of solvents decreases with increasing molecular weight?

<p>Volatility</p> Signup and view all the answers

Which class of solvents includes compounds like chlorinated aliphatic hydrocarbons?

<p>Aliphatic hydrocarbons</p> Signup and view all the answers

Which class of solvents is characterized by a benzene ring in their structure?

<p>Aromatic hydrocarbons</p> Signup and view all the answers

Which class of solvents contains compounds with the functional group -OH?

<p>Alcohols</p> Signup and view all the answers

Which class of solvents includes compounds with the functional group C=O?

<p>Aldehydes</p> Signup and view all the answers

What is a major determinant of a solvent's inherent toxicity?

<p>Presence of functional groups</p> Signup and view all the answers

What property of alcohols contributes to their capacity to induce central nervous system sedation?

<p>Molecular weight</p> Signup and view all the answers

Why do nonpolar molecules penetrate the blood-brain barrier more freely?

<p>Due to their lower molecular weight</p> Signup and view all the answers

Which factor contributes to making a molecule less polar as its molecular weight increases?

<p>Number of carbon atoms</p> Signup and view all the answers

What is the exceptional case where a low molecular weight alcohol is more toxic than higher molecular weight alcohols?

<p>Methanol</p> Signup and view all the answers

Which type of alcohol has great clinical interest due to its dihydroxy composition?

<p>Ethylene glycol</p> Signup and view all the answers

What is the density of ethanol?

<p>0.78 g/mL</p> Signup and view all the answers

How does ethanol distribute throughout the body?

<p>Uniformly in proportion to the water content of each organ</p> Signup and view all the answers

What phenomenon may potentially result from ethanol crossing the placenta in a pregnant woman?

<p>Fetal alcohol syndrome</p> Signup and view all the answers

What is the ratio of blood ethanol to CNS ethanol after ethanol crosses the blood-brain barrier?

<p>1:0.9</p> Signup and view all the answers

Where does the major part of an ethanol load get metabolized?

<p>Liver</p> Signup and view all the answers

Which enzyme catalyzes the first step of ethanol metabolism?

<p>Alcohol dehydrogenase</p> Signup and view all the answers

What occurs more quickly, the formation of acetaldehyde or its dissipation?

<p>Dissipation of acetaldehyde</p> Signup and view all the answers

Why is it beneficial for only small amounts of acetaldehyde to be present in the blood at any one time?

<p>Because acetaldehyde is more toxic than ethanol</p> Signup and view all the answers

What is the final product of alcohol metabolism?

<p>Acetic acid</p> Signup and view all the answers

Which system is responsible for converting ethanol to acetaldehyde as the first product of ethanol oxidation?

<p>Catalase</p> Signup and view all the answers

What is the major substrate for the Krebs cycle?

<p>Acetyl coenzyme A</p> Signup and view all the answers

Which enzyme oxidizes ethanol with molecular oxygen and NADPH?

<p>MEOS enzymes</p> Signup and view all the answers

What is the unlikely route for catalase to account for more than 10% of ethyl alcohol metabolism?

<p>Using the Krebs cycle</p> Signup and view all the answers

What is the final product of the hepatic microsomal ethanol oxidizing system (MEOS)?

<p>Acetaldehyde</p> Signup and view all the answers

What is the primary site of action for alcohol in the brain?

<p>Reticular activating system</p> Signup and view all the answers

Which part of the brain is less sensitive to alcohol's effects compared to the reticular activating system?

<p>Medulla</p> Signup and view all the answers

What are two bad effects of alcohol that can be attributed to the large quantity of NADH resulting from alcohol metabolism?

<p>Liver damage and low blood sugar</p> Signup and view all the answers

Which compound is favored in the presence of high quantities of reduced NAD (NADH), as found during alcohol metabolism?

<p>Fatty acids</p> Signup and view all the answers

Which process occurs during times of low glucose ingestion, such as long after eating, due to high quantities of NADH from alcohol metabolism?

<p>Gluconeogenesis</p> Signup and view all the answers

What is the normal range for blood sugar levels?

<p>70 to 110 mg/dL</p> Signup and view all the answers

At what blood sugar level is coma usually present?

<p>20 mg/dL</p> Signup and view all the answers

What results in severe depression of blood sugar in chronic drinkers dependent on alcohol for most of their calories?

<p>Low liver glycogen and impaired gluconeogenesis</p> Signup and view all the answers

What happens when liver glycogen is low and gluconeogenesis is impaired in chronic drinkers dependent on alcohol for most of their calories?

<p>Blood sugar is severely depressed</p> Signup and view all the answers

At what concentration of ethanol in the blood might a person experience emotional instability, impaired perception, and memory?

<p>0.09–0.25 g/dL</p> Signup and view all the answers

Which concentration range of ethanol in the blood is associated with coma, anesthesia, severely depressed reflexes, and possible respiratory and circulatory collapse?

<p>0.03–0.12 g/dL</p> Signup and view all the answers

What effect is typically associated with a concentration of 0.01–0.05 g/dL of ethanol in the blood?

<p>No obvious impairment, small reduction in reflex action</p> Signup and view all the answers

Which concentration range of ethanol in the blood is characterized by dizziness, diplopia, decreased muscular coordination, and slurred speech?

<p>0.18–0.30 g/dL</p> Signup and view all the answers

What is the common effect of ethanol concentration in the blood range of 0.03–0.12 g/dL?

<p>Euphoria, decrease in judgment and control, and start of sensory impairment</p> Signup and view all the answers

What are the signs and symptoms associated with an ethanol concentration in the blood of 0.35–0.50 g/dL?

<p>Coma, anesthesia, severely depressed reflexes, respiratory and circulatory collapse possible, death possible</p> Signup and view all the answers

At what concentration of ethanol in the blood might a person experience emotional instability, impaired perception, and memory?

<p>0.09–0.25 g/dL</p> Signup and view all the answers

What is the effect associated with an ethanol concentration in the blood of 0.09–0.25 g/dL?

<p>Emotional instability, impaired perception and memory, reduced visual ability, impaired balance</p> Signup and view all the answers

Which organ system is most severely affected by alcohol?

<p>Central nervous system</p> Signup and view all the answers

What condition arises from impaired hepatic circulation due to cirrhosis?

<p>Esophageal varices</p> Signup and view all the answers

Which liver condition is reversible ?

<p>Fatty liver</p> Signup and view all the answers

What kind of psychoses may behavioral disturbances resemble in severe cases of alcoholism ?

<p>Paranoid and schizophrenic psychoses</p> Signup and view all the answers

What is a marketed inhibitor of aldehyde dehydrogenase used in the treatment of chronic alcoholism?

<p>Antabuse (Disulfiram)</p> Signup and view all the answers

What is the effect of taking Antabuse (Disulfiram) for someone who consumes alcohol?

<p>Increased acetaldehyde concentration in blood</p> Signup and view all the answers

What is the primary reason why patients taking Antabuse (Disulfiram) are inclined not to drink alcohol?

<p>Acetaldehyde toxicity after drinking</p> Signup and view all the answers

What is a common symptomatic therapy used for ethanol toxicity?

<p>Glucose</p> Signup and view all the answers

What is the approximate lethal dose of methanol?

<p>1 g/kg</p> Signup and view all the answers

What is the volume of distribution of methanol?

<p>0.7 L/kg</p> Signup and view all the answers

In what products is methanol found?

<p>Windshield washer fluid, paint thinner, and formaldehyde</p> Signup and view all the answers

How does the toxicity of methanol compare to that of ethanol?

<p>Methanol is approximately 4 times as toxic as ethanol</p> Signup and view all the answers

What are the specific products of methanol metabolism?

<p>Methanal and acetic acid</p> Signup and view all the answers

Why does formic acid accumulate in severe methanol overdose?

<p>Because of the slow hepatic conversion of methanol</p> Signup and view all the answers

What route makes a larger percent contribution to methanol excretion than that observed for ethanol?

<p>A+D</p> Signup and view all the answers

Why do ethanol and methanol not metabolize at the same rate when present together?

<p>Ethanol metabolism is faster</p> Signup and view all the answers

In the conversion of formate to CO2, which enzyme is responsible for the first step of producing 10-formyl-THF?

<p>Formyl-THF synthetase</p> Signup and view all the answers

What is the final product when 10-formyl-THF is oxidized to CO2 in the conversion process?

<p>CO2</p> Signup and view all the answers

Which enzyme is responsible for oxidizing 10-formyl-THF to CO2 in the formate to CO2 conversion process?

<p>Formyl-THF dehydrogenase (FTHF-DH)</p> Signup and view all the answers

Which compound is converted to 10-formyl-THF by formyl-THF synthetase in the conversion process?

<p>Formic acid</p> Signup and view all the answers

What is the characteristic visual disturbance associated with acute methanol poisoning?

<p>Complete blindness and diplopia</p> Signup and view all the answers

At what concentration of ethanol in the blood might a person experience emotional instability, impaired perception, and memory?

<p>0.06–0.09 g/dL</p> Signup and view all the answers

What is the primary site of action for alcohol in the brain?

<p>Reticular activating system</p> Signup and view all the answers

What is the major substrate for the Krebs cycle?

<p>Pyruvate</p> Signup and view all the answers

What is a potential retinal symptom of ethanol poisoning?

<p>Blurred vision</p> Signup and view all the answers

Which condition may result from ethanol poisoning progressing to hypotension and cardiogenic shock?

<p>Renal damage</p> Signup and view all the answers

What is a potential respiratory symptom of ethanol poisoning ?

<p>Tachypnoea</p> Signup and view all the answers

Which symptom is associated with ethanol poisoning at an approximate concentration of 0.35–0.50 g/dL in the blood?

<p>Coma and convulsions</p> Signup and view all the answers

Which compound has been shown to accumulate in humans following methanol treatment and acts as a direct ocular toxin?

<p>Formic acid</p> Signup and view all the answers

What is the cause of metabolic acidosis due to its inherent acidic nature in the context of methanol treatment?

<p>Formic acid</p> Signup and view all the answers

Which compound inhibits cytochrome oxidase and thereby reduces cellular respiration of methanol treatment?

<p>Formic acid</p> Signup and view all the answers

What does the accumulation of lactic acid lead to in the context of methanol treatment?

<p>Exacerbation of evolving acidosis</p> Signup and view all the answers

What is suggested to be necessary for the initiation of retinal toxicity by formic acid?

<p>The entry of methanol into the vitreous humor and its intraretinal metabolism</p> Signup and view all the answers

Which enzyme is mentioned to be able to nonspecifically oxidize methanol ?

<p>Retinol dehydrogenase</p> Signup and view all the answers

What is believed to be a function of ocular toxicity ?

<p>Metabolism in retinal or optic nerve tissues generating toxic metabolites locally</p> Signup and view all the answers

What contributes to the extensive entry of methanol into the vitreous humor?

<p>The extremely aqueous nature of the vitreous humor</p> Signup and view all the answers

What is the main concern of therapy for methanol poisoning ?

<p>Infusing sodium bicarbonate to reverse acidosis</p> Signup and view all the answers

Why is ethanol considered a semi-specific antidote for methanol poisoning ?

<p>It neutralizes the toxic metabolites of methanol</p> Signup and view all the answers

What is the recommended range for blood ethanol level when infusing ethanol as an antidote for methanol poisoning?

<p>100-150 mg/dL</p> Signup and view all the answers

Why can't one provide ethanol as an antidote for methanol poisoning in an unlimited manner?

<p>Due to the risk of CNS toxicity</p> Signup and view all the answers

What is the main concern of therapy for a methanol-poisoned patient?

<p>Reversing the acidosis</p> Signup and view all the answers

Which compound is mentioned as a semi-specific antidote for methanol poisoning?

<p>Ethanol</p> Signup and view all the answers

Why is ethanol given as an antidote for methanol poisoning?

<p>To tie up the enzymes converting methanol to toxic metabolites</p> Signup and view all the answers

What should be done unless a contraindication exists in a methanol-poisoned patient?

<p>Forcing the patient to vomit</p> Signup and view all the answers

What is the mechanism of action of Antizol (fomepizole)?

<p>It acts as a competitive inhibitor of alcohol dehydrogenase</p> Signup and view all the answers

Which compound is Antizol (fomepizole) indicated as an antidote for?

<p>Methanol poisoning</p> Signup and view all the answers

What is the effect of ethanol and Antizol (fomepizole) on alcohol dehydrogenase?

<p>Ethanol and Antizol both inhibit alcohol dehydrogenase</p> Signup and view all the answers

What is the primary function of Antizol (fomepizole) of methanol and ethylene glycol poisoning?

<p>To block the metabolism of methanol and ethylene glycol to their toxic metabolites</p> Signup and view all the answers

What is the primary function of Antizol (fomepizole) of methanol and ethylene glycol poisoning?

<p>Inhibits the metabolism of methanol and ethylene glycol to their toxic metabolites</p> Signup and view all the answers

What compound has been shown to accumulate in humans following methanol treatment and acts as a direct ocular toxin?

<p>Formic acid</p> Signup and view all the answers

What is a potential retinal symptom of ethanol poisoning ?

<p>Blurred vision</p> Signup and view all the answers

At what concentration of ethanol in the blood might a person experience emotional instability, impaired perception, and memory?

<p>$0.09-0.25 g/dL$</p> Signup and view all the answers

What is an advantage of Antizol® compared to ethanol in the context of methanol and ethylene glycol poisoning?

<p>It does not require monitoring of serum Antizol</p> Signup and view all the answers

What is a significant difference between 4-methylpyrazole and ethanol in the context of methanol and ethanol combination?

<p>4-methylpyrazole is a CNS depressant, reducing the danger of extreme CNS depression</p> Signup and view all the answers

Why is hemodialysis unnecessary in some cases of Antizol® treatment?

<p>Because Antizol® acts as a not CNS depressant</p> Signup and view all the answers

What aspect makes 4-methylpyrazole a preferable therapeutic option compared to ethanol of methanol and ethylene glycol poisoning?

<p>It is a CNS depressant, reducing the danger of extreme CNS depression</p> Signup and view all the answers

When should Antizol treatment be initiated?

<p>On suspicion of ethylene glycol or methanol poisoning</p> Signup and view all the answers

Under what condition should hemodialysis be considered during Antizol treatment?

<p>When serum concentration is &gt;25 mg/dL</p> Signup and view all the answers

How should Antizol be administered?

<p>Dilute dose in 100 ml saline, infuse over 30 minutes</p> Signup and view all the answers

At what frequency should Antizol be dosed until ethylene glycol or methanol concentration level is zero?

<p>Q12H</p> Signup and view all the answers

When should Antizol treatment be initiated?

<p>On suspicion of ethylene glycol or methanol poisoning</p> Signup and view all the answers

What is the indication for initiating hemodialysis?

<p>Blood methanol level greater than 25mg/dL</p> Signup and view all the answers

How is Antizol administered as per the given information?

<p>Dilute dose in 100 ml saline, infuse over 30 minutes</p> Signup and view all the answers

What is the function of calcium leucovorin of methanol poisoning?

<p>Enhance the folate dependent degradation of formic acid</p> Signup and view all the answers

What serum concentration level indicates the need to consider hemodialysis?

<p>&gt;25 mg/dL</p> Signup and view all the answers

How often should Antizol be dosed until the ethylene glycol or methanol concentration level is zero?

<p>Q12H</p> Signup and view all the answers

What is the final product of the metabolism of isopropanol?

<p>Acetone</p> Signup and view all the answers

Which alcohol is found in many consumer products primarily as a cosmetic base and also used as a disinfectant?

<p>Isopropanol</p> Signup and view all the answers

What property of isopropanol allows it to cause depression by entering the CNS?

<p>Slight polarity compared to ethanol</p> Signup and view all the answers

What happens as isopropanol is cleared from the blood by metabolism?

<p>The concentration of acetone in blood rises</p> Signup and view all the answers

What are the symptoms associated with isopropanol overdose?

<p>Hypotension, mild acidosis, hypoglycemia, and signs of alcoholic stupor</p> Signup and view all the answers

What is the main concern of therapy for isopropanol poisoning?

<p>Managing hypotension and electrolyte imbalances</p> Signup and view all the answers

What therapy should be considered if hypoglycemia is present in the case of isopropanol overdose?

<p>Infusing glucose with constant monitoring of blood sugar</p> Signup and view all the answers

When should hemodialysis be considered for isopropanol overdose?

<p>If laboratory findings confirm an electrolyte or acid-base imbalance</p> Signup and view all the answers

What is the primary route of exposure to ethylene glycol?

<p>Dermal and accidental ingestion</p> Signup and view all the answers

What are the major metabolites responsible for symptoms of serious ethylene glycol poisoning?

<p>Glycolic and oxalic acids</p> Signup and view all the answers

What characteristic makes ethylene glycol of low volatility?

<p>Viscosity</p> Signup and view all the answers

What is the lethal dose of ethylene glycol?

<p>1.4 – 1.6 ml/kg</p> Signup and view all the answers

In the metabolism of ethylene glycol, what happens when the first carbon is fully oxidized?

<p>The second carbon undergoes a two-step oxidation</p> Signup and view all the answers

What is the enzyme central to the oxidative pathway of ethylene glycol metabolism?

<p>Alcohol dehydrogenase</p> Signup and view all the answers

Which intermediate in the path of ethylene glycol metabolism can be converted to formic acid or oxalic acid?

<p>Glyoxylic acid</p> Signup and view all the answers

What is the primary reason for the diverse range of symptoms associated with ethylene glycol overdose?

<p>The variety of metabolites and the duration of the metabolic process</p> Signup and view all the answers

What contributes to making a molecule less polar as its molecular weight increases?

<p>Increased surface area</p> Signup and view all the answers

What is the major substrate for the Krebs cycle?

<p>Acetyl-CoA</p> Signup and view all the answers

Why does formic acid accumulate in severe methanol overdose?

<p>It is produced as a result of methanol metabolism</p> Signup and view all the answers

What is the characteristic visual disturbance associated with acute ethylene glycol poisoning?

<p>Scotoma</p> Signup and view all the answers

During which stage of ethylene glycol poisoning is the renal toxicity with calcium oxalate crystals observed?

<p>Stage 3 (24 hours- 3 days)</p> Signup and view all the answers

What is the potential consequence of untreated metabolic acidosis during stages 2 and 3 of ethylene glycol poisoning?

<p>Progressively severe metabolic acidosis</p> Signup and view all the answers

During which stage of ethylene glycol poisoning may the duration and degree of inebriation vary depending upon the dose?

<p>Stage 1 (30 minutes-12 hours)</p> Signup and view all the answers

What is the characteristic of stage 2 (12 hours-24 hours) of ethylene glycol poisoning?

<p>Tachycardia and tachypnea, progressing to cardiac failure and pulmonary edema</p> Signup and view all the answers

What is the first clinical stage of ethylene glycol poisoning?

<p>Central Nervous System symptoms</p> Signup and view all the answers

What is the primary effect of ethanol on the Central Nervous System?

<p>Depression</p> Signup and view all the answers

What potential consequence can occur during stages 2 and 3 of ethylene glycol poisoning?

<p>Metabolic acidosis</p> Signup and view all the answers

What is the final metabolic product of aldehyde metabolism?

<p>Oxalic acid</p> Signup and view all the answers

What is the major cause of metabolic (lactic) acidosis in ethylene glycol overdose?

<p>Inhibition of cytochrome oxidase</p> Signup and view all the answers

What does a high anion gap indicate in the context of ethylene glycol poisoning?

<p>Elevated additional anions present in the blood</p> Signup and view all the answers

What causes hypocalcemia in aldehyde metabolism?

<p>Calcium oxalate crystals</p> Signup and view all the answers

What is the primary effect of formic acid in ethylene glycol overdose?

<p>Inhibition of cytochrome oxidase</p> Signup and view all the answers

What is the significance of measuring the anion gap in confirming ethylene glycol poisoning?

<p>Useful in confirming poisonings of this type</p> Signup and view all the answers

What is the primary purpose of hemodialysis in the treatment of ethylene glycol poisoning?

<p>To enhance elimination of unmetabolized toxin and metabolites</p> Signup and view all the answers

Why may infusions of calcium be necessary in ethylene glycol poisoning?

<p>Hypocalcemia may be life-threatening</p> Signup and view all the answers

What is one of the primary objectives of treating ethylene glycol poisoning?

<p>Correcting metabolic acidosis</p> Signup and view all the answers

What type of calcium oxalate crystals are more specific for ethylene glycol poisoning?

<p>Calcium oxalate dihydrate</p> Signup and view all the answers

Which antidotal therapy is used in the same way as for methanol in ethylene glycol poisoning?

<p>Ethanol</p> Signup and view all the answers

What is the characteristic visual symptom associated with acute methanol poisoning?

<p>Yellow halos around lights</p> Signup and view all the answers

Which enzyme oxidizes ethanol with molecular oxygen and NADPH?

<p>Cytochrome P450</p> Signup and view all the answers

What is the purpose of using either ethanol or 4-methyl pyrazole in the context of methanol poisoning?

<p>To prevent the conversion of methanol to formic acid</p> Signup and view all the answers

What contributes to the extensive entry of methanol into the vitreous humor?

<p>Highly polar nature</p> Signup and view all the answers

What is a characteristic visual symptom associated with acute methanol poisoning?

<p>Blurred vision with halos around lights</p> Signup and view all the answers

What happens as isopropanol is cleared from the blood by metabolism?

<p>It is converted to acetic acid</p> Signup and view all the answers

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