A Farmer Bitten at Dusk: Neurotoxic Snakebite 70 km from Antivenom
At 6:40 pm in a village 22 km from the taluk hospital, a 45-year-old farmer is carried into the sub-centre. He was cutting sugarcane when he felt a sharp bite on the right ankle about 50 minutes ago. His brother has tied a tight cloth band above the knee and made a small cut over the fang marks, which is still oozing blood. The patient is sweating, says his eyelids feel heavy, and is drooling slightly. Pulse 58/min, blood pressure 100/70 mmHg, respiratory rate 20/min and shallow. The right foot is swollen, with two fang marks and dark staining around them. He is drowsy but responds to his name. The sub-centre has oxygen, IV fluids, a bag-valve mask and an ambulance driver, but no antivenom; the nearest antivenom is at the district hospital, 70 km away. The family wants to take him to a traditional healer first.
1. List, in order, the first four actions you will take on arrival, and explain the reason for each. Include what you will do about the first aid already given.
Read the worked answer
1. Airway, breathing and oxygen first. Lie him flat, turn the head to the side because he is drooling, give oxygen 10–12 L/min by mask and keep a bag–valve mask ready. Ptosis, drooling and shallow breathing mean the venom is already affecting swallowing and breathing; respiratory paralysis is what kills in neurotoxic bites.
2. Undo the harmful first aid. Loosen and remove the cloth band slowly, not with a jerk. A tight band causes limb ischaemia and, when released suddenly, can throw a bolus of venom into the circulation. Do not cut, suck, burn or apply herbal paste to the fang marks; clean with plain water or saline and cover.
3. Immobilise and position. Splint the leg, keep it at about heart level (not raised), and remove rings, anklets and tight clothing.
4. Arrange definitive care. Secure IV access, phone the medical officer and the district hospital, and move him by ambulance with oxygen and a bag–valve mask. Monitor pulse, breathing and consciousness every 10–15 minutes. Antivenom, not time, is what he needs.
2. Explain what the heavy eyelids, drooling and shallow breathing indicate. Why does a pulse of 58/min change your transport decision?
Read the worked answer
Drooping eyelids, drooling and shallow breathing together point to neurotoxic envenomation with bulbar and respiratory muscle weakness. Drooling is not just saliva - he cannot swallow, so he is at risk of aspiration and must not be given anything by mouth; position him semi-prone or with the head to one side.
Shallow breathing is the earliest sign of the respiratory failure that causes death, so the decision changes from 'transfer when convenient' to 'transfer now, with a person whose only job is to watch his breathing'.
A pulse of 58/min is bradycardia. It may be a direct venom effect, but in this setting always exclude hypoxia first - recheck the airway, give oxygen and reassess. Do not give atropine blindly for the slow pulse. Record serial observations: respiratory rate, chest movement, ability to speak and swallow, and oxygen saturation if available. If breathing stops, ventilate with the bag–valve mask and continue transport.
3. The family refuses hospital transfer and wants the traditional healer. What do you say and do?
Read the worked answer
Be direct, calm and non-judgemental, and speak to the person who decides - usually the father or an elder. Say plainly: 'The poison is already affecting his breathing. Death can come within a few hours. The healer cannot give antivenom, and there is no time.' Do not mock the healer; link the advice to the family's own wish to save him.
Practical steps: offer the ambulance, state that the district hospital is free, and ask one family member to travel with him. Inform the medical officer and the PHC immediately. If refusal continues, record it in the register with the time, the exact words used, the risks explained, and the signature or thumb impression of the relative plus a witness. Refusal of hospital care does not end your duty: keep him under observation, continue oxygen and monitoring, and if he becomes apnoeic, treat that as a life-threatening emergency - ventilate and transport. Never physically restrain or discharge a dying patient, and keep the door open for the family to change its mind.