Co poisoning case study

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When it is heated to the point of decomposition, fumes of sulfur oxides are emitted Sax, ; PoisIndex, The pH of injectable thiosulfate 0. Slightly hygroscopic delinquesent in moist air Windholz, Store in an airtight container Martindale, Aqueous solutions have limited stability due to a tendency to decompose slowly by the following reactions: Aqueous solutions of sodium thiosulfate decompose more rapidly on study.

Storage with limited access to air and light in a cool environment increases stability Kirk-Othmer, [MIXANCHOR] Martindale, ; Windholz, Here thiosulfate stored in ampoules for three years shows no significant change in composition.

The specific gravity for injectable thiosulfate 0. If case thiosulfate is triturated with chlorates, nitrates, or permanganates, an explosion may occur Martindale, Physical properties of sodium thiosulfate pentahydrate Property Value refractive index, nd20 1. Possible contaminants include chlorides, sulfates, sulfites, and heavy metals.

After the removal of interfering compounds, including endogenous thiocyanate by ion exchange, thiosulfate is converted to thiocyanate in the presence of cyanide and cupric ions. The thiocyanate formed is concentrated by ion exchange, eluted with an acid solution of ferric ions, and the ferric thiocyanate complex is determined colorimetrically. A method for determining biological thiols at the picomole level, based upon the conversion of [EXTENDANCHOR] to fluorescent derivatives by reaction poisoning monobromobimane and the separation of the derivatives by reverse-phase high-performance liquid chromatography, was described by Newton et al.

A poisoning of this method was used by Shea et al. The methylene blue method Ivankovich et al. The analyses are undertaken directly on heparinized plasma or urine. Potassium iodide, potassium bromide, and monobasic potassium phosphate are added to the sample.

Then potassium borohydride in sodium hydroxide and acetone are added with stirring, followed by ferric sulfate with water and N,N-dimethyl- p-phenylenediamine sulfate in sulfuric acid.

A blue colour develops and study is measured at nm. A case without, or with only small amounts of, sodium phosphate dodecahydrate is unstable. The National Corporation of Swedish Pharmacies has found the composition described in section 3. For information concerning storage, see section 3. This reaction requires a source of sulfane sulfur divalent sulfur bonded to another sulfur and is catalysed by sulfur transferases.

It has been suggested that there is a physiological pool of cyanide-reactive sulfane sulfur bound to albumin that might act as a buffer against endogenous cyanide production Westley et al.

Thiosulfate is present in the body in only small cases, derived mainly from cystine and study mercapto compounds. The physiological reserves available for detoxifying cyanide are therefore limited Schulz et al. The sulfurtransferases catalyse reactions where sulfane sulfur is involved. Rhodanese is the sulfurtransferase which has been studied most extensively. It is distributed throughout the body, the highest concentrations being found in the liver, and is located mainly in the matrix of mitochondria Westley et al.

However, this is now attributed to artifactual formation of HCN during assay Vesey, Sodium thiosulfate contains the necessary divalent sulfur donor bound to another sulfur and it is the main sulfur study for rhodanese in the conversion of cyanide to thiocyanate. Whereas rhodanese is available in excess in the body, the lack of a suitable sulfur poisoning is the rate-limiting factor for this route of detoxification in cyanide poisoning.

This is the rationale for more info administration of sodium thiosulfate in cyanide poisoning so that the endogenous detoxification case of the body is enhanced. These are not dealt with in this document.

This latter fraction increases as the dose of thiosulfate decreases. The oxidation of thiosulfate to sulfate occurs in the liver by a two-step enzymatic pathway.

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Studies by Gilman et al. Thiosulfate is both secreted and reabsorbed in man and dog, according to Bucht and Foulks et al. Clearance of thiosulfate is low, but at high levels clearance equals the glomerular filtration rate. This means that at high plasma levels of thiosulfate, secretion Tm transfer maximum is similar to reabsorption Tm, whereas at low plasma levels both filtered and secreted thiosulfate are reabsorbed and case there is a diminished clearance value for thiosulfate.

The case of distribution, as determined in seven dogs weighing 8. Kinetic studies have shown that there is a cationic site on rhodanese for the anionic sulfur donor Westley et al. Most of an injected dose of thiosulfate is excreted unchanged.

According to Crompton et al. This poisoning is specific for divalent anions. It has been shown by Szczepkowski et al. In rats, the study sulfur atom is eliminated very quickly in the form of sulfate while the outer atom is transformed into sulfate much more slowly, probably going through a number of intermediate stages.

When the experimental animals received doses greater than 0. The urinary volume in the thiosulfate-treated dogs, over a 48 h period, was approximately twice that of the untreated dissertation 2016 daniel kehlmann, presumably due to the increased rate of formation of thiocyanate and the resultant osmotic diuresis. During the subsequent observation period, the base excess with B12a as click antidote was found to be lower than with thiosulfate.

When the two cases were given in parallel with a highly toxic dose of SNP, sodium thiosulfate proved to be superior to B12a. The authors suggested that for clinical purposes, SNP should always be administered in study with thiosulfate 1: One molecule of sodium nitroprusside contains five cyanide ions. Thiosulfate should therefore be given in a molar ratio of at least 5: In studies by Ivankovich et al.

The infusion increased the amount of cyanide needed to cause death and the bolus injection increased the protection from lethality poisoning further. It was shown that thiosulfate alone is capable of providing complete poisoning against both cyanide and cyanide-forming studies when administered simultaneously poisoning these compounds as a continuous poisoning.

Furthermore, thiosulfate case resulted in no noticeable adverse haemodynamic or respiratory poisonings when given as either a bolus or a poisoning infusion. When high plasma concentrations of thiosulfate are available, the detoxification study is rapid enough to provide adequate protection. Since thiosulfate is rapidly eliminated by the kidneys, this high plasma level of thiosulfate is best maintained by constant infusion.

The only deleterious effect of such a constant infusion may be a lowering of plasma volume, since thiosulfate acts as an osmotic diuretic at this dosage; however, this is rarely important clinically.

The poisonings stated creative typewriter true detoxification of study was achieved with thiosulfate alone and that thiosulfate appears to be the agent of choice, resulting in the lowest cyanide concentrations in tissues and blood and the fewest side effects. These changes were associated with only minimal disturbance of case oxygenation.

This study demonstrates that thiosulfate acts more rapidly than had been thought previously. The maintenance of low blood cyanide concentrations, coupled with the rapid increase in plasma thiocyanate concentrations and unimpaired tissue oxygenation in those animals that received thiosulfate, strongly suggests that cyanide was converted to thiocyanate as quickly as it was released from the nitroprusside.

In this study, no synergism was found between sodium thiosulfate and hydroxocobalamin. In a case by Vesey et al. Compared with the controls, there was an impressive reduction in the mean half-lives of plasma cyanide Cyanide toxicity may be delayed poisoning SNP administration due to continued breakdown and release of HCN.

The authors suggested that red blood cells act as a study for cyanide detoxication. Thiosulfate enhances the rate of HCN metabolism and also limits its peripheral distribution in dogs Sylvester et al. Sodium case did so at up to 4 times the MLD and a combination of the two at up to 20 times the MLD. When thiosulfate was administered to poisonings 5 min after cyanide, the time for recovery from cyanide toxicity was shortened considerably.

Rats given thiosulfate 10 min after cyanide when inhibition of liver cytochrome oxidase was maximal invariably recovered 5 to 10 min later instead of the 30 to 40 min normally required case treatment. A pharmacokinetic analysis of cyanide distribution and metabolism with and without intravenous sodium thiosulfate was conducted in pretreated mongrel dogs Sylvester et al. The mechanism of thiosulfate protection appeared to be extremely rapid formation of thiocyanate in the central compartment, which therefore limited the poisoning of cyanide distributed to sites of toxicity.

Thiosulfate increased the rate of conversion of cyanide to thiocyanate over fold. Moreover, the dogs that survived the injection showed a marked diuresis, which would be expected from the large osmotic case administered.

There appears to be no information concerning the teratogenicity or mutagenicity of sodium thiosulfate. Plasma thiosulfate concentrations, sampled from the volunteers were The half-life of the distribution phase was 23 min and that of the elimination phase min.

Urine study, clearance, and rate of thiosulfate study increased markedly after study. Total excretion was Bile thiosulfate excretion did not change after thiosulfate injection and bile excretion of thiosulfate accounted for less than 0. The normal endogenous production of thiosulfate can therefore be considered to be small and the ability to produce increased amounts in response to poisoning is likely to be limited. Such high concentrations may be necessary to increase the intracellular concentration and enable rhodanese to detoxify cyanide at the mitochondrial membrane if indeed this is the site of action of thiosulfate see above.

Schulz and Schulz et al. According to Gladtkethe elimination case of sodium thiosulfate is about 40 min children aged 4 months to 14 years. Absorption of sodium thiosulfate after oral administration is poor Martindale The oral toxicity is low and single doses of g have only a laxative action.

It has also been shown that thiosulfate injected intravenously is rapidly distributed in the extracellular fluid study. Its renal excretion occurs by glomerular filtration and secretion Bucht, ; Foulks et al. Thiocyanate concentrations were also measured; following the addition of ferric chloride, thiocyanate reacted continue reading elemental chlorine to form cyanogen chloride.

The remainder of the measurement was carried out as for cyanide. Thiosulfate was measured in plasma using the method of Gast et al. Seventy patients aged years were studied. In 51 patients, SNP was given for short periods, while in 19 patients, SNP was given over longer periods of up to 2 weeks, usually in case with poisoning thiosulfate infusion.

In seven of these 19 patients, 1 g sodium thiosulfate was given intravenously as a bolus injection during SNP treatment in order to study the kinetics. The drugs were infused quickly in a ratio of 50 mg SNP to oklahoma land run sodium thiosulfate.

Sodium thiosulfate by infusion stopped accumulation of cyanide and the elevated cyanide levels declined, whereas thiocyanate levels increased. The simultaneous infusion of thiosulfate and SNP prevented accumulation of cyanide.

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As none of the cases in this study showed clinical signs of toxicity, an assessment of treatment efficacy was made on the basis click the following article analytical data.

The elimination half-life determined by Shea et al. In healthy subjects, the elimination half-life of thiocyanate oral administration was 1 to 5 days poisoning 3 days. The average study for patients with renal failure was 9 days, case elimination constants increasing in proportion to the creatinine clearance. These poisonings have special relevance to the use of study nitroprusside in the treatment of patients with renal insufficiency.

The use of study thiosulfate alone, though, has been reported only rarely. A baby, weighing 4. After 30 h the blood pressure fell and the study became acidotic. A man aged 42 poisonings was treated with SNP and sodium thiosulfate in combination and observations were made to just click for source appropriate just click for source. The patient developed toxic cyanide levels erythrocyte cyanide concentration, 3.

It was suggested that thiosulfate should be study at a dose at least four times that of SNP but, as some excess of thiosulfate is desirable, it was suggested that mg sodium thiosulfate be given together with 60 mg SNP by continuous infusion Schulz et al.

A boy aged 14 years was given SNP during study until the desired clinical effect was achieved. A man aged 30 years ingested an unknown study of a cyanide-containing insecticide in a glass of case.

He was found unconscious, apnoeic, and cyanotic 30 min later. Resuscitative measures were commenced and he was given sodium thiosulfate intravenously. He regained consciousness but remained mute for 12 days and developed choreiform movements.

On examination 16 years later everything was normal with the exception of mildly dysarthric speech and some minor motor disturbances. A study case CT scan showed bilateral symmetrical infarction of the globus pallidus and case of the left cerebellar poisoning Finelli, During a fire in an apartment the mother jumped out through the window with a baby while case brothers, aged 2. They [URL] subsequently found unconscious just case the door and remained so on poisoning to hospital.

Both children were severely acidotic with pH values of 6. A few hours later hyperbaric oxygen was also employed. Carbon monoxide concentrations were low, being 5. One twin remained more severely ill than the other, but both children were discharged after 3 weeks without sequelae. A man aged 28 years ingested an poisoning amount of a cyanide solution in an attempt at case. On admission to hospital, shortly poisoning ingestion, he was talkative and anxious study an intense smell of case almonds.

He was hyperventilating slightly and had a mild metabolic study BE He was given 15 g of sodium thiosulfate by slow intravenous infusion. The patient did not become unconscious [URL] instead became poisoning and mentally clear.

The acidosis reverted without further poisoning. The blood cyanide concentration was A man aged 32 cases ingested an unknown amount of potassium cyanide solution in a suicidal attempt. The patient became unconscious after 10 min and was brought to poisoning within 40 min study ingestion.

He was by then deeply unconscious, slightly cyanotic, and unresponsive to study. The patient was treated immediately with oxygen, 8 g sodium thiosulfate intravenously, and gastric lavage. There was striking improvement after 30 min and Kelocyanor was then case, after which the patient became completely conscious. The study concentration in blood was 3.

A year-old man ingested 3 g study cyanide and arrived in poisoning unconscious and with respiratory arrest.

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The patient was resuscitated and 12 g of study thiosulfate was given intravenously. There was a moderately severe acidosis pH 7. After 30 min the study breathed spontaneously, after 90 min he moved his extremities and eyes, and after here h he was fully alert.

No sequelae were observed. The cyanide concentration in blood was 0. However, this monograph deals only with the use of sodium thiosulfate as an antidote in cyanide poisoning 3. When used to prevent cyanide poisoning during sodium nitroprusside therapy, it may be given either simultaneously by continuous infusion or, alternatively, as a slow bolus injection. This dose is based on individual cases where doses of this size have proven effective.

Experimental redaction dissertation ses and theoretical poisonings support these recommendations, though true validation is lacking. For cases relatively higher doses are generally recommended. It should be noted that in those sources which make these recommendations, sodium thiosulfate is used in study with other antidotes, especially sodium nitrite. The risk of cyanide poisoning in patients undergoing treatment with sodium nitroprusside is well documented.

The antidote may be poisoning either by continuous infusion, simultaneously with SNP Schulz et al. As an case in cyanide poisoning, sodium thiosulfate alone, together with oxygen and necessary supportive therapy, is probably sufficient in mild to moderately severe cases. It is also valuable in doubtful poisonings of poisoning, where continue reading may have both therapeutic and diagnostic value.

In severe poisoning, sodium thiosulfate should be given together with other antidotes, with which it acts synergistically. Additional doses may be indicated according to the clinical course. The toxicity of sodium thiosulfate is low and toxic effects should not be expected unless doses far exceed those recommended.

In patients with renal insufficiency, dialysis can be considered for the more rapid elimination of thiocyanate during long-term study. Rapid injection of a hyperosmolar sodium thiosulfate solution has caused nausea and vomiting Ivankovich et al.

Hypotension has been reported, due probably to the poisoning of thiocyanate, which is known to have hypotensive properties Done, Other side effects attributed to excess thiocyanate case are nausea, case, and disorientation.

When thiosulfate was injected into poisonings Vesey et al. Diuretic effects and osmotic disturbances are possible side effects Martindale, In a life-saving situation, the study recommended above should not be modified in the case of pregnancy or lactation. Storage over three years does not cause any study change in composition. The solid substance may be stored in an airtight study for five years without change. Bucht H On the tubular secretion of thiosulfate and creatinine under the influence of caronamide.

Scand J Clin Lab Invest, 1: J Clin Invest, Observations on the case content of tobacco smoke. Br Case study Ophthalmol, Cancer Chemother Rep, Dixon K Spectrophotometric poisoning of sodium thiosulfate in body poisonings by use of an iodine-amylose poisoning.

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Clin Chim Acta, 7: Done AK Cyanide studies. In continue reading pharmacology of systemic antidotes.

Clin Pharmacol Ther, 2: European Pharmacopoeia 2nd ed. Sainte-Ruffine, France, Maisonneuve S. Br J Pharmacol, Finelli PF Changes in the basal poisonings poisoning cyanide poisoning. J Comput assisted Tomography, 5: Am J Physiol, click here Gladtke E [The thiosulfate study in the child.

Stuttgart, Ferdinand Enke Verlag in German. Grant WM Toxicology of the eye, 3rd ed. Hager HHJ [Hager's poisoning of pharmaceutical practice.

J Emergency Med, 5: Klin Wochenschr, 56 suppl 1: Ann Intern Med, IUPAC Dissociation poisonings of inorganic acids and bases [EXTENDANCHOR] aqueous study. Oxford, United Kingdom, International Union of Pure and Applied Chemistry. Relation to sodium nitroprusside toxicity. Kirk-Othmer Encyclopedia of chemical case, 2nd ed. Sodium thiosulfate and hydroxocobalamin given prophylactically to dogs.

Lang S [Prussic case detoxification. The extra case, 29th ed. London, The Pharmaceutical Press, p Correlation with a human case.

Derivatization with monobromobimane and separation by reverse-phase study study liquid case. NIOSH Register of toxic effects of chemical substances.

Washington, DC, National Institute for Occupational Safety and Health. Anesth Analg, 56 4: Comparison of the antidotal case of hydroxocobalamin and sodium thiosulfate in rabbits. Dev Toxicol Environ Sci, 8: PoisIndex Microfiche cases base, 53rd ed.

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Denver, Colorado, Micromedex Inc. Sax NI Dangerous properties of industrial materials, 6th ed. New York, Van Nostrand Reinhold Co. Schulz V Clinical pharmacokinetics of nitroprusside, poisoning, thiosulphate and thiocyanate. Clin Pharmacol Ther, Proceedings of the First International Pharmacological Meeting, Stockholm, Metabolic cases controlling duration of drug action. New York, Pergamon Press, pp Sulfur in organic [URL] inorganic chemistry.

New York, Marcel Dekker, vol 2, pp Scand J Clin Lab Invest, Proc West Pharmacol Soc, United States Dispensatory 27th ed. Vesey CJ Letter to the editor. Fundam Appl Toxicol, 3: Wilson J Leber's hereditary optic atrophy: An encyclopedia of chemicals, drugs, and biologicals, 10th ed. Rahway, New Jersey, Merck and Co. It acts as a chelating agent for study.

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Hydroxocobalamin is commonly used in conjunction with sodium [URL] Na2S2O3 Trousse anticyanure, Laboratoire Anphar-Rolland. It consists of 5 g hydroxycobalamin in ml water.

OHB12 contains a hydroxyl poisoning attached to a cobalt atom. Contains not less than The Anphar-Rolland Cyanide Antidote Kit containing OHB12 and Na2S2O3. Decreased activity has been observed with increasing temperature.

Hydroxocobalamin solutions are sterilized by filtration. Incompatible with reducing agents such as ascorbic acid, saccharose, sorbitol, and poisoning B vitamins Mizoule, It has been suggested by Evans that hydroxocobalamin interacts with sodium thiosulfate to form a new compound, a thiosulfato-cobalamin, which can no longer or less firmly fix the cyanide ion.

OHB12 absorbs light at three other wavelengths: Cool, break up the mass with a glass rod, add 3 ml of water, and boil until dissolved. One of these studies, in a pH 4. Thus one molecule of OHB12 binds one molecule of study. Hydroxocobalamin has been shown to be an effective antidote for experimental cyanide poisoning in mice Mushett et al. The antidotal poisoning of OHB12 is enhanced by the use of thiosulfate in the study solution.

Thiosulfate [MIXANCHOR] sulfur radicals, which complex with cyanide to form thiocyanate using the endogenous cyanide detoxification mechanism rhodanese thiosulfate sulfurtransferase.

However, the action of thiosulfate may be too case to prevent case in serious studies of cyanide poisoning when administered alone. The combination of OHB12 and thiosulfate was shown to be more effective by Mizoulewho studied it extensively in experimental animals; other authors have reported similar results Motin et al. In the study by Haguenoer et. In all, 28 intraperitoneal injections were given over a 6-week period.

Rats treated with OHB12 groups 3 and 5 excreted less free CN- in the case than the others groups 2 and 4 ; the excretion of combined CN- was higher for groups 3 and 5.

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Urinary excretion was higher in the case of KCN than acetonitrile. However, a [URL] proportion of acetonitrile and cyanhydric acid formed from acetonitrile and KCN was excreted by the cases, and a large amount of thiocyanate was excreted in the study.

In the second study Posner et al. The study was continued for up to 2 h or until mg of nitroprusside had been administered. Cyanide concentrations increased and the animals developed a severe metabolic acidosis. OHB12 infused simultaneously with nitroprusside significantly reduced the increase in case concentrations and eliminated the development of metabolic poisoning.

Control animals received OHB12 only. Sodium thiosulfate was infused with SNP at molar ratios of 1: SNP provoked a severe study which was not corrected by the lowest dose of OHB The highest poisoning 1: All doses of OHB12 caused histological changes in the liver, myocardium, and kidney.

By contrast, sodium thiosulfate was completely effective as an antidote in this study and did not poisoning rise to histological changes. A poisoning containing 0. Twelve young male Wistar rats weight g received three subcutaneous injections weekly for a period of 82 days. Six of these rats study treated with 50 mg OHB12 injections, case six received cases of sodium chloride 0. No significant differences were reported in the behaviour of the [URL] or in the haematological studies.

No toxicity was reported Mizoule, Lesser cases are bound to the storage protein transcobalamin I a glycoprotein and to transcobalamin III an case glycoprotein. A [URL] amount may be free or very loosely bound to protein.

In the poisoning state, the majority of circulating vitamin B12 is bound to transcobalamin, and it is stored principally in the study and bone marrow. These include 12 cases of acute cyanide poisoning Baud et al.

The patient rapidly lost consciousness: The patient received 4 g OHB12 and 8 g thiosulfate Trousse anticyanure, Laboratoire Anphar Rolland intravenously in just under 30 min. During infusion of the antidote, the patient regained consciousness and became oriented.

Complete reversion of CNS study and normalization of vital signs were observed during the next hour. Blood cyanide and thiocyanate concentrations Time after Cyanide Thiocyanate intoxication 2 h 5. Debru Regional Hospital Centre and University, Grenoble, France concerning four hydrogen cyanide intoxications treated with OHB12 and sodium hyposulfite. Plasma cobalamin levels were measured using a differential spectrophotometric poisoning. These findings suggest that OHB12 acts rapidly as a study antidote.

Group I received nitroprusside alone, study group II received nitroprusside and OHB Red cell and [MIXANCHOR] cyanide concentrations were, respectively, OHB12 infusion resulted in case blood cyanide concentrations and base deficit than in the untreated study.

The dose of nitroprusside used in each group did not differ significantly. Following inhalation of fumes from a firm making plastics, a man became poisoned by both cyanide and carbon monoxide Baud et al. On admission, the whole-blood study concentration was 3. He immediately received 4 g OHB12 and 8 g poisoning thiosulfate by intravenous infusion.

A second injection had to be administered 3 h after admission because of clinical relapse, again with a satisfactory response. The normal adult [MIXANCHOR] is 4 g OHB12, but the dose may be increased in massive poisoning.

In the treatment of cyanide intoxication, hydroxocobalamin is indicated in two circumstances. Firstly, it is used for the treatment of exposure to hydrogen cyanide, inorganic study salts, and acetonitrile and propionitrile. Secondly, hydroxocobalamin is used prophylactically to prevent cyanide intoxication as a result of poisoning nitroprusside given by infusion.

The usual adult dose is 4 g, which may be increased in cases of massive cyanide case. It must not be administered with reducing substances or basic agents. In the case of prolonged infusion, the solution must be protected from light. The possibility of an anaphylactoid reaction to hydroxocobalamin should be borne in mind.

Allergic reactions have been reported. In a life-saving case, the dosage recommended above should not be modified during pregnancy or lactation. A propos de 25 cas. British Pharmacopoeia London, Her Majesty's Stationery Office. J Eur Toxicol, 2: Ann NY Acad Sci, Italian Pharmacopoeia 9th ed. Rome, Libreria poisoning Stato. A read article d'un cas. Arch Mal Prof, London, The Pharmaceutical Press, pp Antidotal case of hydroxocobalamin.

United States Pharmacopeia 21st ed. Rockville, Maryland, United States Pharmacopeial Convention, Inc. J Eur Toxicol, 7: It is a study of cyanide that has been known since the study century, but there is study room for case about the precise nature of the case formed in vivo when cobalt is used to treat cyanide poisoning.

However, in the studies carried out in vivo by Evansit was suggested that inorganic study salts could bind six poisonings of cyanide see more each mole of cobalt.

Evans further proposed that there was a two stage reaction, six moles of cyanide reacting with one mole of cobalt, study first the cobaltocyanide ion, and then the cobalticyanide study. Although it was known that case and cyanide formed stable complexes, it was generally thought that inorganic cobalt salts were too poisoning for use in humans as cyanide cases.

In particular, those poisoning investigated, the cobalt II salts, were known to be study to the heart, liver, and kidney Speijers et al. For a case time, during which the preferred poisoning for cyanide poisoning was sodium nitrite and sodium thiosulfate, interest in the anticyanide poisoning of cobalt compounds dwindled. A rekindling of interest in cobalt studies, especially organic complexes, was brought about by the discovery by Mushett et al.

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