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IM22.9-13 | Poison Centre and Medico Legal Workflow — SDL Guide

Learning Objectives

• Describe the functions of a poison centre and recognise when to contact one for toxicological advice
• Enumerate the medico-legal aspects of poisoning cases including mandatory documentation and police intimation
• Write a structured medico-legal report for a poisoning case at the supervised house officer (SH) level
• Counsel the family of a poisoning patient regarding prognosis, sequelae, and mental health follow-up
• Identify the indications for psychiatric consultation in poisoning cases, particularly deliberate self-harm and substance abuse

INSTRUCTIONS

Poisoning cases carry significant medico-legal implications in India. Most cases of deliberate self-harm (DSH), homicide by poison, and suspicious deaths require formal medico-legal documentation, police intimation, and coordinated care between medicine and psychiatry. This module covers the clinical skills required for managing the medico-legal and psychosocial dimensions of poisoning — from contacting a poison information centre to writing a medico-legal report to counselling the family and referring to psychiatry.

References

• API Textbook of Medicine, 10th ed., Ch. 26 — Poisoning (textbook)
• Modi's Medical Jurisprudence and Toxicology, 24th ed. (textbook)
• Karmakar's Forensic Medicine and Toxicology, 4th ed. (textbook)

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Version 2.0 | NMC CBUC 2024

Poison Information Centres: Functions and When to Call

Poison information centres (PICs, also called poison control centres or toxicology advisory services) are specialised 24-hour services staffed by trained toxicologists and pharmacists who provide real-time advice on the management of poisoning cases. In India, a national network of PICs exists under the National Poison Control Centre (NPCC) umbrella, with major centres at AIIMS New Delhi, PGIMER Chandigarh, Amrita Institute of Medical Sciences (Kochi), Seth GSMC Mumbai, and government medical colleges in several states. These centres can be contacted by any treating clinician, including house officers, at any hour of the day or night. The National Poison Control helpline (India): 1800-116-117 (toll-free). Tamil Nadu Poison Control Hotline: 044-28193900 (PGIMER Chennai). Knowing how to access this resource is a clinical skill — knowing when to use it is equally important.

Functions of a poison information centre:

1. Toxin identification: When the ingested substance is unknown, poorly labelled, or identified only by brand name, the PIC can help identify the active ingredient, likely toxidrome, and relative toxicity. Brand names of agricultural chemicals, household cleaners, and industrial chemicals are often unfamiliar to treating physicians — the PIC maintains databases of thousands of products.

1. Management advice: The PIC provides specific guidance on antidotes, decontamination strategies (whether activated charcoal is appropriate for the specific agent), indications for specific interventions (e.g., dialysis for salicylates or methanol), and dose guidance for uncommon antidotes (e.g., pralidoxime dosing schedules, digoxin Fab dosing).

1. Risk stratification: Not all ingestions require hospitalisation or aggressive intervention. The PIC can advise whether a specific dose of a specific agent in an otherwise healthy adult is likely to produce toxicity, or whether home observation is appropriate in a paediatric accidental ingestion (where the agent and amount ingested are known and non-toxic).

1. Follow-up advice: Guidance on monitoring parameters, duration of observation, and when specific delayed toxicity is expected (e.g., delayed hepatotoxicity from paracetamol at 24–72 hours, delayed cardiac toxicity from aconitine).

When to call the poison information centre:
- Unknown substance ingested — PIC can help identify the toxin from product description, container, or available information
- Unusual or unfamiliar agent — agricultural chemicals, herbal preparations, mushroom ingestion
- Unusual clinical presentation inconsistent with the stated substance
- Guidance on rare or unfamiliar antidotes
- Paediatric poisoning (dose/weight-based risk stratification)
- Industrial accident or mass casualty involving chemical exposure
- Any case where the managing physician is uncertain about the appropriate treatment strategy

Poison Control Centres and PIC Functions in India

Medico-Legal Obligations in Poisoning Cases

Every poisoning case admitted to a hospital in India is, by definition, a medico-legal case (MLC). The treating physician has both clinical and legal obligations that run in parallel and must not be confused — the clinical obligation (to treat and stabilise) always takes precedence, but the legal obligations must be fulfilled promptly after (or concurrently with) stabilisation. Failure to fulfil medico-legal obligations can have serious professional and legal consequences for the treating doctor, and can compromise the medico-legal investigation that may protect the patient or the public.

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Principle of treatment first: Under the Clinical Establishments Act, the Medical Council of India's Code of Medical Ethics, and Supreme Court judgments (Parmanand Katara v. Union of India, 1989), a physician MUST treat a medico-legal case patient first, regardless of police presence, consent issues, or availability of payment. No physician may withhold emergency treatment pending documentation, police clearance, or consent from a relative.

Mandatory police intimation:
In all cases of poisoning where foul play is suspected, or where the patient is unconscious and the circumstances of poisoning are unknown, or where the poisoning is the result of assault or administration by another person, the police MUST be informed. The mode is a written intimation (usually a standard MLC form maintained by the hospital) sent to the nearest police station. This is a statutory obligation under CrPC. The physician's role is to inform — not to investigate or to determine whether a crime has occurred. The police will decide whether to register an FIR. Important: police intimation is NOT required for all poisoning cases — it is required when there is a reason to suspect that the poisoning is not a straightforward accidental or self-harm case, or when the patient is incapacitated and circumstances are unclear.

Consent and documentation in unconscious patients:
When the patient is unconscious, consent cannot be obtained from the patient. Emergency consent is implied (implied consent doctrine — life-threatening emergency justifies treatment without explicit consent). Document all relatives present, their relationship to the patient, and any consent obtained for procedures. If no relative is present, document the absence and proceed with emergency treatment.

Preservation of evidence:
In suspected poisoning cases, the physician must take care not to destroy potential forensic evidence:
- Gastric aspirate/lavage fluid: collect a sample and label it clearly (date, time, patient ID, case number)
- Vomitus: collect a sample if available
- Clothing: handle minimally; preserve for police if assault is suspected
- Blood and urine: collect forensic samples at admission before any treatment if assault or homicide is suspected (a second set, clearly labelled 'forensic sample')
- IV fluid bags and drug vials: retain if accidental poisoning in a healthcare setting is suspected

Writing the Medico-Legal Report for Poisoning (SH Level)

A medico-legal report (MLR) for a poisoning case is a formal document that records the clinical findings, the investigation results, the treatment given, and the medical opinion regarding the nature and severity of the poisoning, in a format that is admissible as evidence in a court of law. At the SH (supervised house officer) level, you are expected to be able to write or contribute to an MLR under the supervision of a senior — which means you must understand its structure, the language conventions of medico-legal documentation, and the rules that distinguish a medical opinion from a legal conclusion. The key principle: the MLR states medical facts and medical opinions. The legal conclusion (whether a crime was committed, who did it) is for the court, not the physician.

Standard structure of an MLR for poisoning:

Section 1 — Patient identification: Full name, age, sex, address, date and time of admission, hospital ID/MLC number, name of referring physician or police station (if police-referred).

Section 2 — History (as given by informants): The alleged circumstances of poisoning as told by the patient (if conscious) or relatives/police. State the SOURCE of the history — 'as stated by the patient' or 'as given by the attendant (relationship)'. Do NOT state these as facts; use passive voice: 'It was stated that...'

Section 3 — Clinical findings on admission: General condition, GCS score, vital signs (BP, pulse, RR, temperature, SpO₂), signs of poisoning specific to the toxidrome (pupil size and reactivity, skin findings, oral cavity, smell on breath, secretions, muscle fasciculations). Document the time of examination.

Section 4 — Investigations: List all relevant investigations with dates and results (ABG, renal function, LFT, ECG, serum drug levels where available, gastric aspirate sent for analysis, urine toxicology if done).

Section 5 — Treatment given: A clear chronological account of treatment — gastric lavage (time, amount of fluid used, character of return), activated charcoal (dose and time), antidotes administered (name, dose, route, time), supportive care given. This section is important for both clinical and legal purposes — it demonstrates that the standard of care was followed.

Section 6 — Progress and outcome: The patient's clinical course during admission; final diagnosis; prognosis and likely sequelae; whether forensic samples were collected and preserved.

Section 7 — Medical opinion: A clear statement of the physician's medical opinion — the nature of the poisoning (accidental/suicidal/homicidal as far as the medical evidence can suggest), the severity, whether the injuries/toxicity are consistent with the stated history, and any medical factors relevant to the legal investigation. Use precise language: 'In my medical opinion...' or 'The clinical findings are consistent with...' Avoid legal conclusions: do NOT write 'This was a murder' or 'She was forced to consume this substance' — these are legal conclusions, not medical opinions.

Language conventions in MLR writing:
- Use passive voice for history: 'it was alleged that', 'as stated by the patient'
- Use precise measurements, not qualitative estimates: '4 cm × 3 cm bruise on the right forearm' not 'a large bruise'
- Times must be exact: '14:35 hours on 05-06-2026' not 'afternoon'
- State what you observed, not what you inferred: 'pupils were 2 mm, bilaterally equal and reactive' not 'pupils showed organophosphate poisoning'
- Medical opinion section uses 'In my opinion...' or 'Based on my clinical examination and investigations...'

Medico-Legal Report Template for Suspected Poisoning