Chemistry week 4 Flashcards
Single, short-term exposure
Acute toxicity
Dose is sufficient to cause immediate toxic effects
Acute toxicity
Repeated and frequent exposure for extended period of time
Chronic toxicity
Dose that are insufficient to cause immediate acute response
Chronic toxicity
Grain alcohol
Ethanol
Seen in alcoholic beverages
Ethanol
Most common abused drug
Ethanol
Wood alcohol
Methanol
Converted into formaldehyde, then finally to formic acid
Methanol
1,2 - ethanediol
Ethylene glycol
Deposition of calcium oxalate (monohydrate) crystals in renal tubules is caused by
Ethylene glycol
Rubbing alcohol
Isopropanol
can cause CNS depression and hypertension. Can also increase acetone in the blood and urine
Isopropanol
Leftward shift in the oxygen-hemoglobin dissociation curve resulting in a decrease in the amount of oxygen delivered to the tissue
Carbon monoxide
Cherry red color of the blood and the face
Carbon monoxide poisoining
Units of carbon monoxide in blood
%
units of carbon monoxide in air
ppm
Common suicide agent
Cyanide
Bitter almonds odor
Cyanide
_____ are the most abundant pesticides and are responsible for about one-third of all pesticide poisoning
Organophosphates
Decreased levels of this are seen in pesticides poisoning
Pseudocholinesterase
Strong affinity to keratin
Arsenic
Mee’s line
Arsenic
Specimen for short-term exposure of arsenic
Urine and blood
Specimen for long-term exposure of arsenic
Hair or nails
Garlic breath
Arsenic
Can cause tubular proteinuria, glucosuria, and aminoaciduria
Defect in tubular reabsorption
Cadmium
(+) GGT in sample
Cadmium toxicity
Acquired via skin contact, inhalation, and ingestion (except animal bite)
Lead poisoning
Plumbism
Lead poisoning
Interferes with vitamin D and heme synthesis
can lead to anemia (microcytic, hypochromic,)
Lead
Basophilic stippling can be seen in?
Lead poisoning
Sample for lead testing
Whole blood
Anticoagulant for lead testing
EDTA (tan top)
Mercury is acquired though
inhalation, skin absorption, and ingestion
Erethism, and Pink disease (acrodynia) is caused by
Elemental mercury
Congenital minimata disease is caused by
Alkyl mercury
Cocaine, benzoylecgonine (cocaine metabolite), Amphetamines, Methamphteamines
CNS stimulants
Barbiturates, Methaqualone, Benzodiazepines, Oxycodone, Morphine, Heroine, Codeine, Methadone
CNS depressants
Cannabinoids (Marijuana), Phencyclidine (PCP)
Hallucinogens
Lithium, Tricyclic antidepressants
Antidepressant
Most potent and abundant cannabinoid
Marijuana
Only prohibited drug that can be positive for45 days (long half-life)
Marijuana
Half-life is 0.5 to 1 hour
Cocaine
Amphetamine derivative commonly referred to as ecstacy
Methylenedioxymethamphetamine (MDMA)
Reference method for drugs of abuse detection
GCMS
Temp of urine for drug test
32.5 to 37.7 C
Volume of urine for drug test
60 mL
Trained to examine the nature of those effects
Toxicologist
Describes the degree to which a substance is poisonous or can cause injury
Toxicity
Concerned with health effects from exposure to chemicals in the workplace
Occupational/Industrial toxicology
Includes the evaluation of environmental chemical pollutants and their impact on human health
Environmental toxicology
Gathers and evaluate existing toxicological information to establish concentration-based standard of “safe” exposure
Regulatory toxicology
Involved in delivering a safe and edible supply of food to the consumer
Food toxicology
Concerned with diseases illnesses associated with short term or long-term exposure to toxic chemicals
Clinical toxicology
Concerned with gathering toxicological information from animal experimentation
Descriptive toxicology
Used to help establish cause and effect relationships between exposure to a drug or chemical and the toxic or lethal effects that results from the exposure
Forensic toxicology
Identifies the toxicant through analysis of body fluids, stomach content, excrement, or skin
Analytical toxicology
Makes observation on how toxic substances cause their effects
Mechanistic toxicology
Any chemical that can injure or kill humans, animals, or plants
Toxicant
Usually used when talking about toxic substances produced naturally
Toxin
Those that are damaging to either the survival or normal function of the individual
Adverse effect
Poisonous or deadly effects on the body by inhalation, ingestion, or absorption, or by direct contact
Toxic
State of decreased responsiveness to a toxic effect of a chemical resulting from a prior exposure to the chemical or structurally related chemical
Tolerance
Defined as a exogenous agents that may have an adverse effect on a living organism
Xenobiotics
Also exogenous agents that have an adverse effect on a biological system
Poisons
Endogenous substances that are biologically synthesized either in living cells or in microorganisms
Toxins
Transformation in chemical cause by the activity of hepatocytes (cytochrome p450 isoenzyme)
Xenobiotic biotransformation
Two major organ which are mostly the target organ
Liver and Kidney
The amount of chemical entering the body
Dose
Dose is dependent upon
Environmental concentration
Properties of the toxicant
Frequency of exposure
Length of exposure
Exposure pathway
Increasing response, increasing dose
Graded dose response
No particular dose conder fetal or lethal to individual
Quantal dose response
Grading for toxicology
Low dose =
0-1 =
2-3 =
4 =
Low dose = Low response
0-1 = No observed adverse effect level
2-3 = Linear range
4 = Maximum response
The toxic dose (toxic response)
TD50
The lethal dose (Death)
LD50
The effective dose
ED50
The median lethal concentration
LC50
Toxic symptoms are expressed after repeated applications for a timeframe less than half the life expectancy of the organisms
Subchronic exposure
Can drastically effect the rate of clearance of compounds
Biotransformation metabolism
Common CNS depressant
Caused disorientation, euphoria, confusion and progress to unconsciousness, paralysis and even death
Alcohols
How alcohol metabolized
Alcohol > ADH > Aldehyde > ADH > Acid
Ethanol will be converted into ____, catalyzed by the enzyme alcohol dehydrogenase, and will be further oxidized into ____ as catalyzes by ADH
Acetaldehyde, acetic acid
Alcohol leaves the body in the average range of
0.015 g/100 ml/hr
Marker for chronic alcoholism
GGT
Methanol is converted first to _____, then finally to ____ by hepatic ALDH
Formaldehyde, Formic acid
No obvious impairment, some changes observable on performance testing
0.01 - 0.05
Mild euphoria, decreased inhibitions, some impairment of motor skill
0.03-0.12
Decreased inhibitions, loss of critical judgment, memory impairment, diminished reaction time
0.09-0.25
Mental confusion, dizziness, strongly impaired motor skills
0.18 - 0.30
Unable to stand or walk, vomiting, impaired consciousness
0.27 - 0.40
Coma and possible death
0.35 - 0.50
Fatal dose of methanol
60-250 mL
Treatment for methanol poisoning
Administration of ethanol or preferably fomepizole to inhibit the metabolism of methanol
Sodium bicarbonate therapy to help alleviate the metabolic acidosis
Folate administration to enhance folate-mediated metabolism of formate
The use of hemodialysis to enhance clearance of methanol and formate
Antifreeze
Ethylene Glycol (1,2 Ethanediol)
COBH % in nonsmokers
0.5%