THE PATTERN OF ORGANOPHOSPHORUS COMPOUNDS POISONING AT A TERTIARY CARE TEACHING HOSPITAL AND MEDICAL COLLEGE IN NORTHERN INDIA

Objective: A retrospective study was conducted in a tertiary care hospital collaborated with a medical college, to analyze the drug therapy including antidotes administered and pattern of Organophosphorous compounds poisoning. Material and methods: The data are analytically drawn from record sheets of Organophosphorous poisoning patients. The collected tabulated data were statistically analyzed with SPSS version for the pattern of Organophosphorous compounds poisoning. Results: The demographic data of 122 Organophosphorous poisoning clinical cases documented 84.42 % suicidal tendency and 15.57 % accidental exposure of patients, 66.39 % in the age of 15-24 years, and 70.49 % were females and 70.49 % from a rural background, and 29.50 % from an urban background. Before pharmacotherapy, all patients were subjected to general supportive measures including stomach wash, and patients were administered pharmacotherapy consisting of Pralidoxime (23.77 %) and Atropine (41.80 %). Conclusion: This present concluded that patients diagnosed with Organophosphorous poisoning can be managed by alone administration of atropine as an antidote which is available as a cost-effective drug as compared to Pralidoxime. Thus cost-effectiveness can be significantly reduced by the rational drug use and strict implementation of the pesticide act to further strengthen the proper maintenance of procurement of Organophosphorous compounds for exclusive agricultural purpose.

The Role of Disinsection and Deratization in the Framework of Non-Specific Prophylaxis of Diseases among the Population in Natural Plague Foci in the Territory of the CIS Countries

Natural foci of plague – a particularly dangerous transmissible zoonotic disease – are widely spread across the world, including in the territory of Russia and a number of neighboring countries in Central Asia. Between 2000 and 2019, 28339 cases of plague were registered in 21 states around the world; lethality rates reached 8 %. Active plague manifestations are associated with the increase in the abundance of carriers and vectors of the disease, which increases the risk of human infection. Prophylactic measures against plague are aimed at prevention and eradication of epidemic foci; they incorporate a whole complex (system) of activities. Disinsection and deratization remain the most radical of them. Control of the numbers of carriers and vectors of plague involves decrement up to the levels at which epizooties will not develop, they are suppressed and liquidated. Currently in the Russian Federation and CIS countries, the focus is on the field and community disinsection when planning and performing exterminatory interventions. The decrease in the numbers of fleas – carriers and vectors of plague microbe – results in disruption of epizootic process and, consequently, in provision of epidemiological welfare as regards this dangerous disease. Insecticide treatments in natural biotopes are carried out using powder-like or aerosolized products, the class of pyrethroids, organophosphorous compounds and phenylpyrazoles by means of advanced equipment: knapsack dusters, power operated air blowers, and foggers. Within the boundaries of residential areas wet disinsection is performed with the help of spraying devices. Field deratization is allowed upon epidemiological grounds only, in localized territories of epizooties, within the boundaries of the settlements of plague infected carriers. Zinc phosphide- or anticoagulant-based bait products are used as rodenticides. Therewith, the eradication of valuable animal species, rare species of small mammals and endemic species is prohibited. Community deratization is always accompanied by the community disinsection. When planning and carrying out insecticide and rodenticide treatments the priority is given to the safety of handling the chemical preparations, to the exclusion of the negative effect on target animal species.

Recent Advances in Microwave Promoted C-P Cross-coupling Reactions

: Organophosphorous compounds are of potential importance in diverse fields. They are often used as intermediates for making functionalized phosphine ligands as well as find vast applications in the areas of industrial, agricultural and biological chemistry. The microwave-assisted synthesis of C-P bonds has become increasingly popular because of its various advantages over conventional heating in the perspectives of green chemistry. : This review article has primarily focused on the synthesis of various organophosphorous molecules via microwave promoted C-P cross-coupling reactions under metal-catalyzed or metal–free conditions over the last two decades. The synthesis of phosphine ligands on 4,4′-bisquinolone structural framework, disubstituted phosphinic acid esters, vinyl phosphines, aryl- and vinylphosphonates, sugar and nucleoside phosphonates, aminobisphosphonates, triphenyl phosphines, water-soluble tertiary phosphine oxides and many other potentially useful organophosphorous compounds have been illustrated critically. The Hirao reaction, Michaelis-Arbuzov reaction and Sandmeyer type of reactions are generally involved in creating C-P bonds. The role of various metal catalysts, solvents, bases, additives and temperature in different literatures are carefully discussed.

Study and modeling of mechanisms of cholinesterasis reactions in order to improve their catalytic properties in the neutralization reactions of organophosphorous compounds

“Biocleaners” or “bioscavengers” are biological objects (enzymes, catalytic antibodies) that are capable of binding and/or hydrolyzing organophosphorus compounds (OPC). Their use seems to be the most effective alternative to traditional antidotes to neutralize or detoxify OPC. The introduction of bioscavengers allows neutralizing toxicant molecules in the bloodstream before they reach their biological targets, thereby providing protection against poisoning. Bioscavengers of the first-generation neutralized OPC molecules by stoichiometrically binding to them. The safety and efficacy of human butyrylcholinesterase (BChE) for protecting against OPC poisoning has been shown. However, the stoichiometric neutralization of OPC requires the introduction of a huge amount of expensive biopharmaceuticals. Catalytic bioscavengers that hydrolytically neutralize OPC were introduced at a much lower dose to achieve the same degree of effectiveness. The most effective catalytic bioscavengers are enzymes. The most promising enzymes are artificial mammalian paraoxonase mutants and bacterial phosphotriesterases. However, studies of other enzymes, such as prolidases, oxidases, artificial mutants of cholinesterases and carboxyl esterases and catalytic antibodies are actively ongoing. Since OPC are pseudosubstrates of cholinesterases (ChEs), a detailed description of the mechanisms of inhibition, dealkylation, and spontaneous reactivation of phosphorylated ChEs is critical for the development of ChEs mutants with a high rate of hydrolysis of OPC. The review presents an analysis of different views on the mechanisms of interaction of ChEs with OPC, discusses the possible directions of creating effective catalytic biological traps based on BChE and changes in their mechanism of action as compared to the native enzyme. A separate section is devoted to the effect of mutations, both polymorphic and artificial, on the stability of the protein molecule of BChE.

Enzymatic detection of organophosphorous compounds

Organophosphorus compounds (OPC) are capable of affecting a wide variety of biological targets, including enzymes. At the same time, there is a large group of enzymes that modify these OPC, mainly by hydrolysis. In total, both those and other enzymes can be involved in determining the content of various OPC. This chapter presents the latest scientific developments in the field of enzyme biosensors for the analysis of OPC in a wide variety of environmental objects. For these purposes, soluble and immobilized forms of enzymes, their various combinations, as well as crude enzymes as a components of microorganisms’ cells can be used. Modern methods make it possible to reach the detection limits of OPC of 10–12 g/L with optical or electrochemical registration of the signal, which opens up enormous prospects for the use of such biosensors in practice. Special examples of commercially available enzyme biosensors for OPC determining are provided

The Possibilities of Working Capacity Maintenance at Organophosphorous Compounds Intoxication

Th e experience of modern local armed confl icts and the monitoring of terrorist activity in the world indicate the possibility of the aff ection of people by organophosphorus compounds (OPs) in combat and as a result of industrial accidents and terrorist acts. It can be predicted that in case of timely use of PPE by the personnel, in addition to lethal and severe aff ections, up to 30 ± 5% of them will be mild forms of intoxication. It is shown in the article, that the actoprotectors with diff erent mechanism of action (hypoxene, octodrine and meldonium) increase the endurance of experimental animals with mild poisoning of OPs in case of single oral administration. Moreover, the degree of inhibition of peripheral blood acetylcholinesterase of all animals treated with model OPs did not diff er between groups and ranged from 8 to 24%. As a result of the experiments on animals, the preparations were distributed in the following order: meldonium <octodrine <hypoxene. Joint oral administration of the test substances was not accompanied by a potentiation of the actoprotective eff ect. It is established, that the combined use of the studied actoprotectors is comparable with the isolated administration of meldonium, has no advantages over the use of octodrine and surpasses hypoxene in rate of onset of the eff ect, but is inferior to it in severity and duration. Th ese facts indicate the viability of use of the studied actoprotectors to prevent a decrease in combat readiness in case of the threat of the aff ection by OPs (hypoxene), for its urgent increase in case of mild aff ection (octodrine) and for the complex treatment of poisoning due to organophosphates (OPs) (meldonium, hypoxene)

Neuropsychological Syndrome and long term effects of Exposure to Organophosphate Pesticides in Humans

Organophosphorous compounds, the anticholinesterases, produce significant morbidity and mortality in Pakistan. Neuropsychological assessment was traditionally carried out to assess the extent of impairment to a particular skill and to attempt to determine the area of the brain which may have been damaged following brain injury or neurological illness. With the advent of neuroimaging techniques, location of space-occupying lesions can now be more accurately determined through this method, so the focus has now moved on to the assessment of cognition and behaviour, including examining the effects of any brain injury or neuropathological process that a person may have experienced.