Snakebite Emergency First Aid & Clinical Evaluation in Rural Victoria

Venomous Snakes of the Goulburn Valley & Regional Victoria

Regional Victoria is home to two of the world's most venomous elapid snakes, regularly encountered in bushland, irrigation channels, orchards, and suburban gardens:

• Eastern Brown Snake (Pseudonaja textilis): Responsible for the majority of snakebite fatalities in Australia. Extremely fast and nervous. Venom contains potent prothrombin activator toxins triggering sudden catastrophic Venom-Induced Consumption Coagulopathy (VICC). Patients can collapse within 15 to 30 minutes of being bitten, with complete defibrination and massive intracranial or internal haemorrhage.
• Tiger Snake (Notechis scutatus): Common around wetlands, rivers, and farm dams. Venom contains potent presynaptic and postsynaptic neurotoxins (causing progressive descending flaccid paralysis: ptosis, diplopia, dysphagia, respiratory paralysis), myotoxins (causing severe rhabdomyolysis, muscle necrosis, acute renal failure, and hyperkalaemia), and procoagulant toxins.
• Red-Bellied Black Snake (Pseudechis porphyriacus): Moderately venomous, causing local swelling, pain, mild coagulopathy, and permanent anosmia (loss of smell), but rarely fatal.

How Venom Travels: The Lymphatic Pipeline

Australian elapid snake venom is not injected directly into high-pressure arteries. Instead, the short fangs (2–4 mm) deposit venom into subcutaneous and muscle tissue. The large venom protein molecules travel exclusively through the low-pressure lymphatic drainage system.

Lymphatic flow is entirely driven by voluntary muscle movement (walking, running, moving the limb). If a person walks or runs after being bitten, the muscular pump pushes venom into the central bloodstream within minutes. If the limb is firmly bandaged and completely immobilised, venom movement is halted for hours, buying vital time for emergency transfer to hospital.

Step-by-Step Pressure Immobilisation Technique (PIT)

PIT is indicated for all venomous Australian snakebites, funnel-web spider bites, and blue-ringed octopus envenomation:

1. Apply a Broad Elasticised Bandage (10–15 cm wide) directly over the bite site: Wrap at the same tension you would apply for a sprained ankle. (Heavy crepe or elasticised compression bandages are ideal; clothing can be torn into strips in an emergency).
2. Bandage the Entire Limb: Starting at the distal extremities (fingers to armpit, or toes to groin), wrap smoothly and firmly over the first bandage and up the entire limb. Leave digits visible if possible to check circulation.
3. Apply a Rigid Splint: Secure a firm piece of wood, branch, folded cardboard, or metal splint along the limb using additional bandages or tape. The splint prevents joint flexion and muscle pumping.
4. Absolute Rest & Transfer: Do not allow the patient to walk or move. Keep them lying down. Dial 000 immediately for ambulance evacuation to a hospital with antivenom capabilities (e.g. Goulburn Valley Health in Shepparton). Never attempt to catch or kill the snake.

Hospital Clinical Evaluation & Antivenom

In the emergency department, the PIT bandage is NEVER removed until intravenous lines are established, resuscitation equipment is ready, and baseline bloods (INR, aPTT, fibrinogen, D-dimer, full blood count, creatine kinase, renal function) are drawn.

If systemic envenomation is confirmed (abnormal coagulation, neurotoxicity, or rhabdomyolysis), specific monovalent or polyvalent antivenom is administered intravenously under close clinical observation.