Chapter 33: Irritant Poisons

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50 Terms

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Cobra venoms
________ are quite toxic and they are a major cause of human envenoming morbidity and mortality.
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Instantaneous death
________ due to shock due to fear of snakebite is observed more often than the actual toxicity of the venom.
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Antivenom
________ is expensive, always in short supply, and has a limited shelf life.
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Neurotoxic factor
________ can mimic strychnine poisoning.
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Hemolytic factors
________ can mimic viperine snakebite.
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Bullae
________ can be aspirated to dryness with a fine sterile needle.
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Calcium gluconate
________ given intravenously can reduce edema /rash.
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Atropine
________ may be given to reduce the pulmonary edema (do not use morphine)
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Snakes
________ like cobra can inject /emit venom by spitting.
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Vomitus
________ shows normal contents initially, but later turns bilious or contains altered blood.
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Adrenocorticotrophic hormone
________ (ACTH) 25 mg in 1000 ml normal saline given as an intravenous drip can help in prevention of severe allergic reactions.
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Scorpion
________ is a poisonous insect (Arthropod) with a crab like body with eight legs and a segmented tail having a bulbous expansion and a sting in the last segment which has a clear, colourless venom (toxalbumin) having two components, a hemolytic and a neurotoxic fractions.
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Centipedes
________ belong to Myriapoda (under class Arthropods) and are organic animal irritants.
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absolute contraindication
There is no ________ to antivenom in patients with life- threatening systemic envenomation.
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rapid immobilization
Venom may have several functions for the snake such as ________ and predigestion of prey.
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Tongue
________ is forked at the tip and serves as a sense organ and can be protruded out even when the mouth is closed through a gap in the upper jaw.
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Snake venoms
________ are usually clear and amber-colored fluid when fresh.
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Snakes
________ are ectothermic (cold- blooded) limbless vertebrates of the Class Reptilia.
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Antivenom
________ is not always necessary; many patients are bitten by nonvenomous snakes, and a large portion of those bitten by venomous snakes are not envenomated.
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Antivenoms
________ have a range of specific and paraspecific neutralizing activity and are useless for venoms outside that range.
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Irritant poison
mainly produce inflammation on the site of contact, especially in the gastrointestinal tract, respiratory tract, and skin
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Jacobsons organ
a cavity in the roof of the mouth with olfactory cells in which the snake inserts the tips of the forked tongue
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**Colubridae**
They rely instead on the trauma caused by other teeth to provide an entry track for their ā€œvenomā€
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**Elapidae**
They have small to moderate-sized fangs at the front of the mouth, possibly the ā€œtrue fangsā€.
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**Viperidae**
All species have well-developed, longer fangs on hinged maxillae, allowing rotation (elevation) when biting, than in any other groups of venomous snakes.
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**Hydrophiidae**
These are sea snakes and are closely related to the cobras, with similar fang structure, but live most or all of their lives in an aquatic, usually marine environment.
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**Atractaspidae**
These are side fanged viper like snakes confined to Africa and the Middle East. They have unusual fang structure and venoms, which contain endothelin-like compounds called **sarafotoxins**, causing potent smooth muscle contraction.
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**Neurotoxic Venom**
Venom common is Elapidae Snakes.
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**Hemotoxic Venom**
Venom common in Viperidae snakes
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**Myotoxic Venom**
Venom commonĀ in hydrophidae or sea snakes.
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**Phosphorus**
It acts as a protoplasmic poison due to which normal metabolism is disturbed and cellular oxidation is severely affected
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**Chlorine**
It acts as a direct irritant of the mucous membrane of the respiratory tract by locally forming hydrochloric acid as it comes in contact with moisture.
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**Bromine**
* It is a reddish-brown liquid, volatilizing to red fumes at room temperature and emitting an unpleasant odor.
* It is more often n use as medicine and act as a sedative and cough elixir.
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**Iodine**
* A volatile crystalline substance with purple glittering color, a characteristic odor, and an acrid taste. It gives violet fumes/vapors at room temperature.
* It acts as an antiseptic. It is a powerful irritant and vesicant.
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**Formaldehyde**
* A colorless gas with a pungent odor. Commercially it is available as formalin, which is a 40 percent aqueous solution of formaldehyde gas.
* A disinfectant, antiseptic, deodorant, tissue fixative, and embalming agent.
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**Arsenic**
It is not poisonous as it is insoluble in water and cannot be absorbed from the gastrointestinal tract.
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**Metallic** **Mercury**
______ is a heavy, silvery liquid and is nonpoisonous. But it volatilises at room temperature and inhalation of vapors is toxic.
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**Lead**
_____ compounds can act by producing spasms of the capillaries and arterioles or by fixation of the poison in the tissues such as brain, bones, etc.
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Copper sulfate
_______ is a crystalline salt with blue color and has a metallic taste. In small dose of 0.5 gm it acts as an emetic, but in large doses it acts as an irritant poison. Poisoning is usually accidental or suicidal.
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**Iron**
Its early features of poisoning are due to the corrosive effects of iron, while later effects are largely due to the disruption of the cellular pr**Abrus Precatorius**ocesses.
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**Abrus Precatorius**
It is a slender vine and climber, with compound leaves having 10-15 pairs of narrow leaves, small pinkish flowers with seedpods which split open when ripe exposing 4-6 seeds within.
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**Ricinus Communis**
It is a large shrub with greenish-red leaves. Fruits are borne in clusters and are soft-spined greenish/ brownish capsules with seeds.
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**Croton Tiglium**
It is an evergreen tree with smooth ash-colored bark. The leaves of the tree are ovate-lanceolate. Flowers are small, and oblong. Fruits are three lobed containing oval, dark brown seeds, with brownish black colour and longitudinal striations.
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**Calotropis**
It is a tall shrub with yellowish-white bark, and oblong thick leaves and purplish or white flowers.Ā 
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**Semicarpus Anacardium**
It is a small tree of East Indian origin. Its flower is dull/greenish yellow in colour. Fruit is black, heart- shaped with hard rind within which is a thick fleshy pericarp which yields brown oily resinous fluid.
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**Capsicum Annum**
It is a small herb bearing somewhat long, tapering fruits, which become red when ripe, and possess a pungent odor and taste.
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**Eucalyptus Globus**
It is a tall tree with smooth bark, long curved leaves, and large flowers. Eucalyptus oil obtained by steam distillation of the extract derived from the leaves.
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**Azadirachta Indica**
It is a tree. Seed grown in the tree yields a yellowish oil (margosa oil), which has a disagreeable odour and bitter taste.
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**Colchicum Autumnale**
Perennial herb (Category: Bulbs) Height: 15-30 cm, with basal, slender leaves; and long, tubular, 6-parted, flowers which are pink, violet/ lavender or white in colour.
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**Ergot**
It is the sclerotium (mycelium) of a fungus Claviceps purpura, which grows on many cereals like rye, barley, wheat, oat, etc. fungus gradually replaces the whole grain to a dark purple mass, which on drying yields ergot.