Sunday, March 5, 2017

Cambodia - Very Venomous Snakes Found - Trimeresurus popeiorum

Trimeresurus popeiorum ( Pope's Pit Viper ) 
Original photo copyright © Dr Anita Malhotra

Family: Viperidae

Subfamily: Crotalinae

Genus: Trimeresurus

Species: popeiorum

Common Names: Pope's Pit Viper , Pope's Green Pit Viper , Pope's Tree Viper , Red-tailed Pit Viper, Pope's Bamboo Pit Viper

Local Names: Ular Kapak Ekor Merah , Ular Engkerudu Daun

Region: Indian Sub-continent + Southeast Asia

Countries: Cambodia, India, Laos, Malaysia, Myanmar, Thailand, Vietnam

Trimeresurus popeiorum ( Pope's Pit Viper ) Original photo copyright © Dr Julian White

Taxonomy and Biology

Adult Length: 0.40 m

General Shape: Small in length, moderately slender ( males ) to moderately stout ( females ), cylindrical bodied pitviper with a medium ( males ) to moderately short ( females ) prehensile tail. Can grow to a maximum of about 0.93 metres. Head is moderately large, longer than broad, triangular shaped and distinct from neck. Snout is rounded when viewed from above and obliquely truncate when viewed from the side. Eyes are moderately large in size with vertically elliptical pupils. Dorsal scales are strongly keeled in males and weakly keeled in females. Dorsal scale count 21 to 23 ( 25 ) - 21 ( 23 ) - 15 ( 17 ).

Habitat: Tropical montane primary and secondary forest regions at elevations up to about 1500 metres.

Habits: Mainly nocturnal and semi-arboreal. Often seen climbing in low bushes near forest streams.

Prey: Feeds mainly on rodents, small birds, lizards and frogs.


General: Venom Neurotoxins
Probably not present
General: Venom Myotoxins
General: Venom Procoagulants
General: Venom Anticoagulants
General: Venom Haemorrhagins
General: Venom Nephrotoxins
General: Venom Cardiotoxins
Probably not present
General: Venom Necrotoxins
General: Venom Other

Clinical Effects

General: Dangerousness
General: Rate of Envenoming
General: Untreated Lethality Rate
General: Local Effects
Insufficient clinical reports to know
General: Local Necrosis
Insufficient clinical reports to know
General: General Systemic Effects
Insufficient clinical reports to know
General: Neurotoxic Paralysis
Unlikely to occur
General: Myotoxicity
Not likely to occur
General: Coagulopathy & Haemorrhages
No reports of coagulopathy, though related species can cause bleeding problems
General: Renal Damage
Insufficient clinical reports to know
General: Cardiotoxicity
Unlikely to occur
General: Other
Insufficient clinical reports to know

First Aid


First aid for bites by Viperid snakes likely to cause significant local injury at the bite site.


1. After ensuring the patient and onlookers have moved out of range of further strikes by the snake, the bitten person should be reassured and persuaded to lie down and remain still. Many will be terrified, fearing sudden death and, in this mood, they may behave irrationally or even hysterically. The basis for reassurance is the fact that many venomous bites do not result in envenoming, the relatively slow progression to severe envenoming (hours following elapid bites, days following viper bites) and the effectiveness of modern medical treatment.

2. The bite wound should not be tampered with in any way. Wiping it once with a damp cloth to remove surface venom is unlikely to do much harm (or good) but the wound must not be massaged.

3. All rings or other jewellery on the bitten limb, especially on fingers, should be removed, as they may act as tourniquets if oedema develops.

4. The bitten limb should be immobilised as effectively as possible using an extemporised splint or sling; if available, crepe bandaging of the splinted limb is an effective form of immobilisation.

5. If there is any impairment of vital functions, such as problems with respiration, airway, circulation, heart function, these must be supported as a priority. In particular, for bites causing flaccid paralysis, including respiratory paralysis, both airway and respiration may be impaired, requiring urgent and prolonged treatment, which may include the mouth to mask (mouth to mouth) technique of expired air transfer. Seek urgent medical attention.

6. Do not use Tourniquets, cut, suck or scarify the wound or apply chemicals or electric shock.

7. Avoid peroral intake, absolutely no alcohol. No sedatives outside hospital. If there will be considerable delay before reaching medical aid, measured in several hours to days, then give clear fluids by mouth to prevent dehydration.

8. If the offending snake has been killed it should be brought with the patient for identification (only relevant in areas where there are more than one naturally occurring venomous snake species), but be careful to avoid touching the head, as even a dead snake can envenom. No attempt should be made to pursue the snake into the undergrowth as this will risk further bites.

9. The snakebite victim should be transported as quickly and as passively as possible to the nearest place where they can be seen by a medically-trained person (health station, dispensary, clinic or hospital). The bitten limb must not be exercised as muscular contraction will promote systemic absorption of venom. If no motor vehicle or boat is available, the patient can be carried on a stretcher or hurdle, on the pillion or crossbar of a bicycle or on someone's back.

10. Most traditional, and many of the more recently fashionable, first aid measures are useless and potentially dangerous. These include local cauterization, incision, excision, amputation, suction by mouth, vacuum pump or syringe, combined incision and suction ("venom-ex" apparatus), injection or instillation of compounds such as potassium permanganate, phenol (carbolic soap) and trypsin, application of electric shocks or ice (cryotherapy), use of traditional herbal, folk and other remedies including the ingestion of emetic plant products and parts of the snake, multiple incisions, tattooing and so on.


Treatment Summary: Bites by this species are not recorded, but might cause moderate, possibly major local & systemic effects, including coagulopathy/bleeding. Urgently assess & admit all cases. Antivenom therapy is probably the key treatment, especially for coagulopathy.

Key Diagnostic Features: Local pain, swelling, blistering, necrosis + coagulopathy, bleeding

General Approach to Management: All cases should be treated as urgent & potentially lethal. Rapid assessment & commencement of treatment including appropriate antivenom (if indicated & available) is mandatory. Admit all cases.

Antivenom Therapy: Antivenom is the key treatment for systemic envenoming. Multiple doses may be required.


1. Antivenom Code: SAsCRI01
Antivenom Name: Polyvalent Anti Snake Venom Serum
Manufacturer: Central Research Institute
Phone: ++91-1-792-72114
Address: Kasauli (H.P.) 173204
Country: India

2. Antivenom Code: SAsTRC01
Antivenom Name: Green Pit Viper Antivenin
Manufacturer: Science Division, Thai Red Cross Society
Phone: ++66-2-252-0161 (up to 0164)
Address: Queen Saovabha Memorial Institute
1871 Rama IV Road
Bangkok 10330
Country: Thailand

3. Antivenom Code: SAsSII01
Antivenom Name: SII Polyvalent Antisnake Venom Serum ( lyophilized )
Manufacturer: Serum Institute of India Ltd.
Phone: +91-20-26993900
Address: 212/2, Hadapsar,
Off Soli Poonawalla Road,
Pune-411042. India
Country: India

4. Antivenom Code: SAsSII02
Antivenom Name: SII Bivalent Antisnake Venom Serum ( lyophilized )
Manufacturer: Serum Institute of India Ltd.
Phone: +91-20-26993900
Address: 212/2, Hadapsar,
Off Soli Poonawalla Road,
Pune-411042. India

Country: India

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