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Carbon monoxide poisoning
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Carbon monoxide poisoning
Synonyms
Carbon monoxide intoxication, carbon monoxide toxicity, carbon monoxide overdose
Carbon monoxide
Specialty
Toxicology, emergency medicine
Symptoms
Headache, dizziness, weakness, vomiting, chest pain, confusion[1]
Complications
Loss of consciousness, arrhythmias, seizures[1][2]
Causes
Breathing in carbon monoxide[3]
Diagnostic method
Carboxyl-hemoglobin level:
>3% (nonsmokers),
>10% (smokers)[2]
Similar conditions
Cyanide toxicity, alcoholic ketoacidosis, aspirin poisoning, upper respiratory tract infection[2][4]
Prevention
Carbon monoxide detectors, venting of gas appliances, maintenance of exhaust systems[1]
Treatment
Supportive care, 100% oxygen, hyperbaric oxygen therapy[2]
Prognosis
Risk of death 1 to 30%.[2]
Frequency
>20,000 emergency visits for non-fire related cases per year (US)[1]
Deaths
>400 non-fire related a year (US)[1]
[edit on Wikidata]
Carbon monoxide poisoning typically occurs from breathing in too much carbon monoxide (CO).[3] Symptoms are often described as "flu-like" and commonly include headache, dizziness, weakness, vomiting, chest pain, and confusion.[1] Large exposures can result in loss of consciousness, arrhythmias, seizures, or death.[1][2] The classically described "cherry red skin" rarely occurs.[2] Long term complications may include feeling tired, trouble with memory, and movement problems.[5] In those exposed to smoke, cyanide toxicity should also be considered.[2]
Carbon monoxide poisoning can occur accidentally or as an attempt to end one's life.[6] CO is a colorless and odorless gas which is initially non-irritating.[5] It is produced during incomplete burning of organic matter.[5] This can occur from motor vehicles, heaters, or cooking equipment that run on carbon-based fuels.[1] It can also occur from exposure to methylene chloride.[7] Carbon monoxide primarily causes adverse effects by combining with hemoglobin to form carboxyhemoglobin (HbCO) preventing the blood from carrying oxygen.[5] Additionally, myoglobin and mitochondrial cytochrome oxidase are affected.[2] Diagnosis is based on a HbCO level of more than 3% among nonsmokers and more than 10% among smokers.[2]
Efforts to prevent poisoning include carbon monoxide detectors, proper venting of gas appliances, keeping chimneys clean, and keeping exhaust systems of vehicles in good repair.[1] Treatment of poisoning generally consists of giving 100% oxygen along with supportive care.[2][5] This should generally be carried out until symptoms are no longer present and the HbCO level is less than 10%.[2] While hyperbaric oxygen therapy is used for severe poisonings, the benefit over standard oxygen delivery is unclear.[2][6] The risk of death among those affected is between 1 and 30%.[2]
Carbon monoxide poisoning is relatively common, resulting in more than 20,000 emergency room visits a year in the United States.[1][8] It is the most common type of fatal poisoning in many countries.[9] In the United States non-fire related cases results in more than 400 deaths a year.[1] Poisonings occur more often in the winter, particularly from the use of portable generators during power outages.[2][7] The toxic effects of CO have been known since ancient history.[10] The realization that hemoglobin was affected by CO was determined in 1857.[10]
Contents
[hide]
1 Signs and symptoms
1.1 Acute poisoning
1.2 Chronic poisoning
2 Causes
3 Pathophysiology
3.1 Hemoglobin
3.2 Myoglobin
3.3 Cytochrome oxidase
3.4 Central nervous system effects
3.5 Pregnancy
4 Diagnosis
4.1 Measuring
4.2 Differential diagnosis
5 Prevention
5.1 Detectors
5.2 Legal requirements
5.3 World Health Organization recommendations
6 Treatment
6.1 Hyperbaric oxygen
6.2 Other
7 Epidemiology
8 History
9 Research
10 References
11 External links
Signs and symptoms[edit]
Carbon monoxide is not toxic to all forms of life. Its harmful effects are due to binding with hemoglobin so its danger to organisms that do not use this compound is doubtful. It thus has no effect on photosynthesising plants.[11] It is easily absorbed through the lungs.[12] Inhaling the gas can lead to hypoxic injury, nervous system damage, and even death. Different people and populations may have different carbon monoxide tolerance levels.[13] On average, exposures at 100 ppm or greater is dangerous to human health.[14] In the United States, the OSHA limits long-term workplace exposure levels to less than 50 ppm averaged over an 8-hour period;[15][16] in addition, employees are to be removed from any confined space if an upper limit ("ceiling") of 100 ppm is reached.[17] Carbon monoxide exposure may lead to a significantly shorter life span due to heart damage.[18] The carbon monoxide tolerance level for any person is altered by several factors, including activity level, rate of ventilation, a pre-existing cerebral or cardiovascular disease, cardiac output, anemia, sickle cell disease and other hematological disorders, barometric pressure, and metabolic rate.[19][20][21]
Effects of carbon monoxide in relation to the concentration in parts per million in the air:[22][23]
Concentration
Symptoms
35 ppm (0.0035%) Headache and dizziness within six to eight hours of constant exposure
100 ppm (0.01%) Slight headache in two to three hours
200 ppm (0.02%) Slight headache within two to three hours; loss of judgment
400 ppm (0.04%) Frontal headache within one to two hours
800 ppm (0.08%) Dizziness, nausea, and convulsions within 45 min; insensible within 2 hours
1,600 ppm (0.16%) Headache, increased heart rate, dizziness, and nausea within 20 min; death in less than 2 hours
3,200 ppm (0.32%) Headache, dizziness and nausea in five to ten minutes. Death within 30 minutes.
6,400 ppm (0.64%) Headache and dizziness in one to two minutes. Convulsions, respiratory arrest, and death in less than 20 minutes.
12,800 ppm (1.28%) Unconsciousness after 2–3 breaths. Death in less than three minutes.
Acute poisoning[edit]
CO toxicity symptoms
The main manifestations of carbon monoxide poisoning develop in the organ systems most dependent on oxygen use, the central nervous system and the heart.[15] The initial symptoms of acute carbon monoxide poisoning include headache, nausea, malaise, and fatigue.[24] These symptoms are often mistaken for a virus such as influenza or other illnesses such as food poisoning or gastroenteritis.[25] Headache is the most common symptom of acute carbon monoxide poisoning; it is often described as dull, frontal, and continuous.[26] Increasing exposure produces cardiac abnormalities including fast heart rate, low blood pressure, and cardiac arrhythmia;[27][28] central nervous system symptoms include delirium, hallucinations, dizziness, unsteady gait, confusion, seizures, central nervous system depression, unconsciousness, respiratory arrest, and death.[29][30] Less common symptoms of acute carbon monoxide poisoning include myocardial ischemia, atrial fibrillation, pneumonia, pulmonary edema, high blood sugar, lactic acidosis, muscle necrosis, acute kidney failure, skin lesions, and visual and auditory problems.[27][31][32][33]
One of the major concerns following acute carbon monoxide poisoning is the severe delayed neurological manifestations that may occur. Problems may include difficulty with higher intellectual functions, short-term memory loss, dementia, amnesia, psychosis, irritability, a strange gait, speech disturbances, Parkinson's disease-like syndromes, cortical blindness, and a depressed mood.[25][34] Depression may occur in those who did not have pre-existing depression.[35] These delayed neurological sequelae may occur in up to 50% of poisoned people after 2 to 40 days.[25] It is difficult to predict who will develop delayed sequelae; however, advanced age, loss of consciousness while poisoned, and initial neurological abnormalities may increase the chance of developing delayed symptoms.[36]
One classic sign of carbon monoxide poisoning is more often seen in the dead rather than the living – people have been described as looking red-cheeked and healthy (see below). However, since this "cherry-red" appearance is common only in the deceased, and is unusual in living people, it is not considered a useful diagnostic sign in clinical medicine. In pathological (autopsy) examination the ruddy appearance of carbon monoxide poisoning is notable because unembalmed dead persons are normally bluish and pale, whereas dead carbon-monoxide poisoned persons may simply appear unusually lifelike in coloration.[37][38][39] The colorant effect of carbon monoxide in such postmortem circumstances is thus analogous to its use as a red colorant in the commercial meat-packing industry.
Chronic poisoning[edit]
Chronic exposure to relatively low levels of carbon monoxide may cause persistent headaches, lightheadedness, depression, confusion, memory loss, nausea and vomiting.[40] It is unknown whether low-level chronic exposure may cause permanent neurological damage.[25] Typically, upon removal from exposure to carbon monoxide, symptoms usually resolve themselves, unless there has been an episode of severe acute poisoning.[40] However, one case noted permanent memory loss and learning problems after a 3-year exposure to relatively low levels of carbon monoxide from a faulty furnace.[41] Chronic exposure may worsen cardiovascular symptoms in some people.[40] Chronic carbon monoxide exposure might increase the risk of developing atherosclerosis.[42][43] Long-term exposures to carbon monoxide present the greatest risk to persons with coronary heart disease and in females who are pregnant.[44]
Causes[edit]
Concentration
Source
0.1 ppm Natural atmosphere level (MOPITT)[45]
0.5 to 5 ppm Average level in homes[46]
5 to 15 ppm Near properly adjusted gas stoves in homes[46]
100 to 200 ppm Exhaust from automobiles in the Mexico City central area[47]
5,000 ppm Exhaust from a home wood fire[48]
7,000 ppm Undiluted warm car exhaust without a catalytic converter[48]
30,000 ppm Afterdamp following an explosion in a coal mine[49]
Carbon monoxide is a product of combustion of organic matter under conditions of restricted oxygen supply, which prevents complete oxidation to carbon dioxide (CO2). Sources of carbon monoxide include cigarette smoke, house fires, faulty furnaces, heaters, wood-burning stoves,[50] internal combustion vehicle exhaust, electrical generators, propane-fueled equipment such as portable stoves, and gasoline-powered tools such as leaf blowers, lawn mowers, high-pressure washers, concrete cutting saws, power trowels, and welders.[25][40][51][52][53][54][55] Exposure typically occurs when equipment is used in buildings or semi-enclosed spaces.[25]
Riding in the back of pickup trucks has led to poisoning in children.[56] Idling automobiles with the exhaust pipe blocked by snow has led to the poisoning of car occupants.[57] Any perforation between the exhaust manifold and shroud can result in exhaust gases reaching the cabin. Generators and propulsion engines on boats, especially houseboats, has resulted in fatal carbon monoxide exposures.[58][59]
Poisoning may also occur following the use of a self-contained underwater breathing apparatus (SCUBA) due to faulty diving air compressors.[60]
In caves carbon monoxide can build up in enclosed chambers due to the presence of decomposing organic matter.[61] In coal mines incomplete combustion may occur during explosions resulting in the production of afterdamp. The gas is up to 3% CO and may be fatal after just a single breath.[49] Following an explosion in a colliery, adjacent interconnected mines may become dangerous due to the afterdamp leaking from mine to mine. Such an incident followed the Trimdon Grange explosion which killed men in the Kelloe mine.[62]
Another source of poisoning is exposure to the organic solvent dichloromethane, found in some paint strippers,[63] as the metabolism of dichloromethane produces carbon monoxide.[64][65][66]
Pathophysiology[edit]
The precise mechanisms by which the effects of carbon monoxide are induced upon bodily systems, are complex and not yet fully understood.[24] Known mechanisms include carbon monoxide binding to hemoglobin, myoglobin and mitochondrial cytochrome oxidase and restricting oxygen supply, and carbon monoxide causing brain lipid peroxidation.[29][37][67]
Hemoglobin[edit]
Carbon monoxide shifts the oxygen-dissociation curve to the left.
Carbon monoxide has a higher diffusion coefficient compared to oxygen and the only enzyme in the human body that produces carbon monoxide is heme oxygenase which is located in all cells and breaks down heme. Under normal conditions carbon monoxide levels in the plasma are approximately 0 mmHg because it has a higher diffusion coefficient and the body easily gets rid of any CO made.[68] When CO is not ventilated it binds to hemoglobin, which is the principal oxygen-carrying compound in blood; this produces a compound known as carboxyhemoglobin. The traditional belief is that carbon monoxide toxicity arises from the formation of carboxyhemoglobin, which decreases the oxygen-carrying capacity of the blood and inhibits the transport, delivery, and utilization of oxygen by the body. The affinity between hemoglobin and carbon monoxide is approximately 230 times stronger than the affinity between hemoglobin and oxygen so hemoglobin binds to carbon monoxide in preference to oxygen.[37][69][70]
Hemoglobin is a tetramer with four oxygen binding sites. The binding of carbon monoxide at one of these sites increases the oxygen affinity of the remaining three sites, which causes the hemoglobin molecule to retain oxygen that would otherwise be delivered to the tissue.[67] This situation is described as carbon monoxide shifting the oxygen dissociation curve to the left.[37] Because of the increased affinity between hemoglobin and oxygen during carbon monoxide poisoning, little oxygen will actually be released in the tissues. This causes hypoxic tissue injury.[25] Hemoglobin acquires a bright red color when converted into carboxyhemoglobin, so poisoned cadavers and even commercial meats treated with carbon monoxide acquire an unnatural reddish hue.
Myoglobin[edit]
Carbon monoxide also binds to the hemeprotein myoglobin. It has a high affinity for myoglobin, about 60 times greater than that of oxygen.[25] Carbon monoxide bound to myoglobin may impair its ability to utilize oxygen.[37] This causes reduced cardiac output and hypotension, which may result in brain ischemia.[25] A delayed return of symptoms have been reported. This results following a recurrence of increased carboxyhemoglobin levels; this effect may be due to a late release of carbon monoxide from myoglobin, which subsequently binds to hemoglobin.[9]
Cytochrome oxidase[edit]
Another mechanism involves effects on the mitochondrial respiratory enzyme chain that is responsible for effective tissue utilization of oxygen. Carbon monoxide binds to cytochrome oxidase with less affinity than oxygen, so it is possible that it requires significant intracellular hypoxia before binding.[71] This binding interferes with aerobic metabolism and efficient adenosine triphosphate synthesis. Cells respond by switching to anaerobic metabolism, causing anoxia, lactic acidosis, and eventual cell death.[72] The rate of dissociation between carbon monoxide and cytochrome oxidase is slow, causing a relatively prolonged impairment of oxidative metabolism.[24]
Central nervous system effects[edit]
The mechanism that is thought to have a significant influence on delayed effects involves formed blood cells and chemical mediators, which cause brain lipid peroxidation (degradation of unsaturated fatty acids). Carbon monoxide causes endothelial cell and platelet release of nitric oxide, and the formation of oxygen free radicals including peroxynitrite.[24] In the brain this causes further mitochondrial dysfunction, capillary leakage, leukocyte sequestration, and apoptosis.[73] The result of these effects is lipid peroxidation, which causes delayed reversible demyelinization of white matter in the central nervous system known as Grinker myelinopathy, which can lead to edema and necrosis within the brain.[67] This brain damage occurs mainly during the recovery period. This may result in cognitive defects, especially affecting memory and learning, and movement disorders. These disorders are typically related to damage to the cerebral white matter and basal ganglia.[73][74] Hallmark pathological changes following poisoning are bilateral necrosis of the white matter, globus pallidus, cerebellum, hippocampus and the cerebral cortex.[14][25][75]
Pregnancy[edit]
Carbon monoxide poisoning in pregnant women may cause severe adverse fetal effects. Poisoning causes fetal tissue hypoxia by decreasing the release of maternal oxygen to the fetus. Carbon monoxide also crosses the placenta and combines with fetal hemoglobin, causing more direct fetal tissue hypoxia. Additionally, fetal hemoglobin has a 10 to 15% higher affinity for carbon monoxide than adult hemoglobin, causing more severe poisoning in the fetus than in the adult.[9] Elimination of carbon monoxide is slower in the fetus, leading to an accumulation of the toxic chemical.[76] The level of fetal morbidity and mortality in acute carbon monoxide poisoning is significant, so despite mild maternal poisoning or following maternal recovery, severe fetal poisoning or death may still occur.[77]
Diagnosis[edit]
Finger tip carboxyhemoglobin saturation monitor (SpCO%). Note: This is not the same as a pulse oximeter (SpO2%), although some models (such as this one) do measure both the oxygen and carbon monoxide saturation.
Breath CO monitor displaying carbon monoxide concentration of an exhaled breath sample (in ppm) with its corresponding percent concentration of carboxyhemoglobin.
As many symptoms of carbon monoxide poisoning also occur with many other types of poisonings and infections (such as the flu), the diagnosis is often difficult.[66][78] A history of potential carbon monoxide exposure, such as being exposed to a residential fire, may suggest poisoning, but the diagnosis is confirmed by measuring the levels of carbon monoxide in the blood. This can be determined by measuring the amount of carboxyhemoglobin compared to the amount of hemoglobin in the blood.[25]
The ratio of carboxyhemoglobin to hemoglobin molecules in an average person may be up to 5%, although cigarette smokers who smoke two packs per day may have levels up to 9%.[79] In symptomatic poisoned people they are often in the 10–30% range, while persons who die may have postmortem blood levels of 30–90%.[80][81]
As people may continue to experience significant symptoms of CO poisoning long after their blood carboxyhemoglobin concentration has returned to normal, presenting to examination with a normal carboxyhemoglobin level (which may happen in late states of poisoning) does not rule out poisoning.[82]
Measuring[edit]
Carbon monoxide may be quantitated in blood using spectrophotometric methods or chromatographic techniques in order to confirm a diagnosis of poisoning in a person or to assist in the forensic investigation of a case of fatal exposure.
A CO-oximeter can be used to determine carboxyhemoglobin levels.[83][84] Pulse CO-oximeters estimate carboxyhemoglobin with a non-invasive finger clip similar to a pulse oximeter.[85] These devices function by passing various wavelengths of light through the fingertip and measuring the light absorption of the different types of hemoglobin in the capillaries.[86] The use of a regular pulse oximeter is not effective in the diagnosis of carbon monoxide poisoning as people with carbon monoxide poisoning may have a normal oxygen saturation level on a pulse oximeter.[87] This is due to the carboxyhemoglobin being misrepresented as oxyhemoglobin.[88]
Breath CO monitoring offers an alternative to pulse CO-oximetry. Carboxyhemoglobin levels have been shown to have a strong correlation with breath CO concentration.[89][90] However, many of these devices require the user to inhale deeply and hold their breath to allow the CO in the blood to escape into the lung before the measurement can be made. As this is not possible in people who are unresponsive, these devices may not appropriate for use in on-scene emergency care detection of CO poisoning.
Differential diagnosis[edit]
There are many conditions to be considered in the differential diagnosis of carbon monoxide poisoning.[15][30] The earliest symptoms, especially from low level exposures, are often non-specific and readily confused with other illnesses, typically flu-like viral syndromes, depression, chronic fatigue syndrome, chest pain, and migraine or other headaches.[91] Carbon monoxide has been called a "great mimicker" due to the presentation of poisoning being diverse and nonspecific.[15] Other conditions included in the differential diagnosis include acute respiratory distress syndrome, altitude sickness, lactic acidosis, diabetic ketoacidosis, meningitis, methemoglobinemia, or opioid or toxic alcohol poisoning.[30]
Prevention[edit]
Carbon monoxide detector connected to a North American power outlet
Detectors[edit]
Prevention remains a vital public health issue, requiring public education on the safe operation of appliances, heaters, fireplaces, and internal-combustion engines, as well as increased emphasis on the installation of carbon monoxide detectors.[12] Carbon monoxide is tasteless and odourless, and therefore can not be detected by visual cues or smell.[92]
The United States Consumer Product Safety Commission has stated, "carbon monoxide detectors are as important to home safety as smoke detectors are," and recommends each home have at least one carbon monoxide detector, and preferably one on each level of the building.[93] These devices, which are relatively inexpensive[94] and widely available, are either battery- or AC-powered, with or without battery backup.[95] In buildings, carbon monoxide detectors are usually installed around heaters and other equipment. If a relatively high level of carbon monoxide is detected, the device sounds an alarm, giving people the chance to evacuate and ventilate the building.[94][96] Unlike smoke detectors, carbon monoxide detectors do not need to be placed near ceiling level.[97]
The use of carbon monoxide detectors has been standardized in many areas. In the USA, NFPA 720-2009,[98] the carbon monoxide detector guidelines published by the National Fire Protection Association, mandates the placement of carbon monoxide detectors/alarms on every level of the residence, including the basement, in addition to outside sleeping areas. In new homes, AC-powered detectors must have battery backup and be interconnected to ensure early warning of occupants at all levels.[98] NFPA 720-2009 is the first national carbon monoxide standard to address devices in non-residential buildings. These guidelines, which now pertain to schools, healthcare centers, nursing homes and other non-residential buildings, include three main points:[98]
1. A secondary power supply (battery backup) must operate all carbon monoxide notification appliances for at least 12 hours,
2. Detectors must be on the ceiling in the same room as permanently installed fuel-burning appliances, and
3. Detectors must be located on every habitable level and in every HVAC zone of the building.
Gas organizations will often recommend to get gas appliances serviced at least once a year.[99]
Legal requirements[edit]
The NFPA standard is not necessarily enforced by law. As of April 2006, the U.S. state of Massachusetts requires detectors to be present in all residences with potential CO sources, regardless of building age and whether they are owner-occupied or rented.[100] This is enforced by municipal inspectors, and was inspired by the death of 7-year-old Nicole Garofalo in 2005 due to snow blocking a home heating vent.[101] Other jurisdictions may have no requirement or only mandate detectors for new construction or at time of sale.
Despite similar deaths in vehicles with clogged exhaust pipes (for example in the Northeastern United States blizzard of 1978 and February 2013 nor'easter) and the commercial availability of the equipment, there is no legal requirement for automotive CO detectors.[citation needed]
World Health Organization recommendations[edit]
The following guideline values (ppm values rounded) and periods of time-weighted average exposures have been determined in such a way that the carboxyhaemoglobin (COHb) level of 2.5% is not exceeded, even when a normal subject engages in light or moderate exercise:
100 mg/m3 (87 ppm) for 15 min
60 mg/m3 (52 ppm) for 30 min
30 mg/m3 (26 ppm) for 1 h
10 mg/m3 (9 ppm) for 8 h
For indoor air quality 7 mg/m3 (6 ppm) for 24 h (so as not to exceed 2% COHb for chronic exposure)
Treatment[edit]
Time to remove 50% carboxy hemoglobin[102]
Oxygen pressure О2
Time
21% Normal pressure (Air outside) 5 hours 20 min
100% Normal pressure (Oxygen mask) 1 hours 20 min
100% Hyperbaric oxygen 23 min
Initial treatment for carbon monoxide poisoning is to immediately remove the person from the exposure without endangering further people. Those who are unconscious may require CPR on site.[37] Administering oxygen via non-rebreather mask shortens the half-life of carbon monoxide from 320 minutes, when breathing normal air, to only 80 minutes.[29] Oxygen hastens the dissociation of carbon monoxide from carboxyhemoglobin, thus turning it back into hemoglobin.[13][103] Due to the possible severe effects in the fetus, pregnant women are treated with oxygen for longer periods of time than non-pregnant people.[104]
Hyperbaric oxygen[edit]
A person within a hyperbaric oxygen chamber
Hyperbaric oxygen is also used in the treatment of carbon monoxide poisoning, as it may hasten dissociation of CO from carboxyhemoglobin[13] and cytochrome oxidase[105] to a greater extent than normal oxygen. Hyperbaric oxygen at three times atmospheric pressure reduces the half life of carbon monoxide to 23 (~80/3 minutes) minutes, compared to 80 minutes for oxygen at regular atmospheric pressure.[13] It may also enhance oxygen transport to the tissues by plasma, partially bypassing the normal transfer through hemoglobin.[103] However, it is controversial whether hyperbaric oxygen actually offers any extra benefits over normal high flow oxygen, in terms of increased survival or improved long-term outcomes.[106][107][108][109][110][111] There have been randomized controlled trials in which the two treatment options have been compared;[112][113][114][115][116][117] of the six performed, four found hyperbaric oxygen improved outcome and two found no benefit for hyperbaric oxygen.[106] Some of these trials have been criticized for apparent flaws in their implementation.[118][119][120][121] A review of all the literature concluded that the role of hyperbaric oxygen is unclear and the available evidence neither confirms nor denies a medically meaningful benefit. The authors suggested a large, well designed, externally audited, multicentre trial to compare normal oxygen with hyperbaric oxygen.[106]
Other[edit]
Further treatment for other complications such as seizure, hypotension, cardiac abnormalities, pulmonary edema, and acidosis may be required. Increased muscle activity and seizures should be treated with dantrolene or diazepam; diazepam should only be given with appropriate respiratory support.[37] Hypotension requires treatment with intravenous fluids; vasopressors may be required to treat myocardial depression.[122] Cardiac dysrhythmias are treated with standard advanced cardiac life support protocols.[25] If severe, metabolic acidosis is treated with sodium bicarbonate. Treatment with sodium bicarbonate is controversial as acidosis may increase tissue oxygen availability.[123] Treatment of acidosis may only need to consist of oxygen therapy.[25][30] The delayed development of neuropsychiatric impairment is one of the most serious complications of carbon monoxide poisoning. Brain damage is confirmed following MRI or CAT scans.[24][124][125] Extensive follow up and supportive treatment is often required for delayed neurological damage.[29] Outcomes are often difficult to predict following poisoning,[126] especially people who have symptoms of cardiac arrest, coma, metabolic acidosis, or have high carboxyhemoglobin levels.[30] One study reported that approximately 30% of people with severe carbon monoxide poisoning will have a fatal outcome.[66] It has been reported that electroconvulsive therapy (ECT) may increase the likelihood of delayed neuropsychiatric sequelae (DNS) after carbon monoxide (CO) poisoning.[127]
Epidemiology[edit]
See also: Category:Deaths from carbon monoxide poisoning.
The true number of cases of carbon monoxide poisoning is unknown, since many non-lethal exposures go undetected.[24][66] From the available data, carbon monoxide poisoning is the most common cause of injury and death due to poisoning worldwide.[128] Poisoning is typically more common during the winter months.[15][129][130][131] This is due to increased domestic use of gas furnaces, gas or kerosene space heaters, and kitchen stoves during the winter months, which if faulty and/or used without adequate ventilation, may produce excessive carbon monoxide.[15][132] Carbon monoxide detection and poisoning also increases during power outages, when electric heating and cooking appliances become inoperative and residents may temporarily resort to fuel-burning space heaters, stoves, and grills (some of which are safe only for outdoor use but nonetheless are errantly burned indoors).[133][134][135]
It has been estimated that more than 40,000 people per year seek medical attention for carbon monoxide poisoning in the United States.[136] 95% of carbon monoxide poisoning deaths in the United States are due to gas space heaters.[137][138] In many industrialized countries carbon monoxide is the cause of more than 50% of fatal poisonings.[9] In the United States, approximately 200 people die each year from carbon monoxide poisoning associated with home fuel-burning heating equipment.[93] Carbon monoxide poisoning contributes to the approximately 5613 smoke inhalation deaths each year in the United States.[139] The CDC reports, "Each year, more than 500 Americans die from unintentional carbon monoxide poisoning, and more than 2,000 commit suicide by intentionally poisoning themselves."[140] For the 10-year period from 1979 to 1988, 56,133 deaths from carbon monoxide poisoning occurred in the United States, with 25,889 of those being suicides, leaving 30,244 unintentional deaths.[139] A report from New Zealand showed that 206 people died from carbon monoxide poisoning in the years of 2001 and 2002. In total carbon monoxide poisoning was responsible for 43.9% of deaths by poisoning in that country.[141] In South Korea, 1,950 people had been poisoned by carbon monoxide with 254 deaths from 2001 through 2003.[142] A report from Jerusalem showed 3.53 per 100,000 people were poisoned annually from 2001 through 2006.[143] In Hubei, China, 218 deaths from poisoning were reported over a 10-year period with 16.5% being from carbon monoxide exposure.[144]
History[edit]
The earliest description of carbon monoxide poisoning dates to at least 200 BC by Aristotle.[145] Documented cases of carbon monoxide being used as a method of suicide date to at least 100 BC in ancient Rome.[145] In the AD 350s, the Roman emperor Julian suffered from carbon monoxide poisoning in Paris, and later described it in his work Misopogon: "though the winter weather prevailed and continually increased in severity, even so I did not allow my servants to heat the house, because I was afraid of drawing out the dampness in the walls; but I ordered them to carry in fire that had burned down and to place in the room a very moderate number of hot coals. But the coals, though there were not very many of them, brought out from the walls quantities of steam and this made me fall asleep. And since my head was filled with the fumes I was almost choked. Then I was carried outside."[146] This misunderstanding of the causes of carbon monoxide poisoning may have caused the death of Julian's successor, Jovian.
John Scott Haldane identified carbon monoxide as the lethal constituent of afterdamp, the gas created by combustion, after examining many bodies of miners killed in pit explosions. Their skin was coloured cherry-pink from carboxyhaemoglobin, the stable compound formed in the blood by reaction with the gas. As a result of his research, he was able to design respirators for rescue workers. He tested the effect of carbon monoxide on his own body in a closed chamber, describing the results of his slow poisoning. In the late 1890s, he introduced the use of small animals for miners to detect dangerous levels of carbon monoxide underground, either white mice or canaries. With a faster metabolism, they showed the effects of poisoning before gas levels became critical for the workers, and so gave an early warning of the problem. The canary in British pits was replaced in 1986 by the electronic gas detector.
As part of the Holocaust during World War II, German Nazis used gas vans at Chelmno extermination camp and elsewhere to kill an estimated over 700,000 prisoners by carbon monoxide poisoning. This method was also used in the gas chambers of several death camps such as Treblinka, Sobibor and Belzec. Gassing with carbon monoxide started in action T4, the euthanasia programme developed by the Nazis in Germany to murder the mentally ill and disabled people before the war started in earnest. The gas was supplied by IG Farben in pressurized cylinders and fed by tubes into the gas chambers built at various mental hospitals, such as Hartheim Euthanasia Centre. Many key personnel were recruited from the T4 programme to murder much larger numbers of people in the gas vans and the special gas chambers used in the death camps such as Treblinka. Exhaust fumes from tank engines for example, were used to supply the gas to the chambers.[147]
The use of oxygen as treatment began in 1868.[145] The use of hyperbaric oxygen in rats following poisoning was studied by Haldane in 1895 while its use in humans began in the 1960s.[145]
Research[edit]
Carbon monoxide is produced naturally by the body as a byproduct of converting protoporphyrin into bilirubin. This carbon monoxide also combines with hemoglobin to make carboxyhemoglobin, but not at toxic levels.[25]
Small amounts of CO are beneficial and enzymes exist that produce it at times of oxidative stress. Drugs are being developed to introduce small amounts of CO during certain kinds of surgery, these drugs are called carbon monoxide-releasing molecules.[148]
References[edit]
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External links[edit]
Classification
V · T · D
ICD-10: T58
ICD-9-CM: 986
MeSH: D002249
External resources
eMedicine: article/819987
Patient UK: Carbon monoxide poisoning

Centers for Disease Control and Prevention (CDC) – Carbon Monoxide – NIOSH Workplace Safety and Health Topic
International Programme on Chemical Safety (1999). Carbon Monoxide, Environmental Health Criteria 213, Geneva: WHO
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values: International Statistical Classification of Diseases and Related Health Problems

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values: ICD-10 Chapter XIX: Injury, poisoning and certain other consequences of external causes

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values: تسمم بأحادي أكسيد الكربون – Arabic

values: Intoxicació per monòxid de carboni – Catalan

values: Δηλητηρίαση από μονοξείδιο του άνθρακα – Greek

values: Intoxicación por monóxido de carbono – Spanish

values: مسمومیت با مونوکسید کربن – Persian

values: Intoxication au monoxyde de carbone – French

values: Toxicidade do monóxido de carbono – Galician

values: 일산화 탄소 중독 – Korean

values: 一酸化炭素中毒 – Japanese

values: Intoxicação por monóxido de carbono – Portuguese

values: Отравление угарным газом – Russian

values: කාබන් මොනොක්සයිඩ් විෂ වීම – Sinhala

values: Тровање угљен-моноксидом – Serbian

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values: Trovanje ugljеn-monoksidom – Serbo-Croatian

values: Отруєння чадним газом – Ukrainian

values: Koolstofmonoxidevergiftigienge – West Flemish

values: 一氧化碳中毒 – Chinese

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