Garlic odour seen in which poisoning?

Appeared in: NORCET 5 Prelims - Sept 2023 (Shift-2)

Explanation

Arsenic poisoning is classically associated with a distinct garlic-like odor on the breath and in bodily secretions.
This odor is produced when the body metabolizes inorganic arsenic into volatile organic compounds, such as dimethylarsine, which are then expelled through the lungs and skin.
The presence of this odor is a strong diagnostic clue for healthcare providers, especially in an emergency setting where the cause of illness is unknown.

Option B: Cyanide poisoning is not associated with a garlic odor. It has its own characteristic smell.
Option C: Lead poisoning does not produce a garlic odor. Patients may report a metallic taste in their mouth, but there is no characteristic breath odor.
Option D: Mercury poisoning is not associated with a garlic odor. Its signs are primarily neurological and renal.

Visual 1: Infographic: A chart comparing the characteristic odors (or lack thereof) and other key signs of common poisons like arsenic, cyanide, lead, and organophosphates.
Visual 2: Diagram: Illustration showing Mees' lines (transverse white bands) on the fingernails, a sign of chronic arsenic poisoning.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Clinical signs of poisoning as background academic context rather than a clinical decision trigger.
For a nurse, recognizing the garlic odor on a patient's breath is a critical assessment finding that can lead to a rapid suspicion of arsenic poisoning, allowing for prompt diagnostic testing and initiation of life-saving chelation therapy.
This sign is particularly important in cases of intentional or accidental poisoning where a patient history is unavailable or unreliable.
What if the patient has recently consumed a large amount of garlic? While this can cause a garlic odor on the breath, it would not be accompanied by the other severe systemic symptoms of acute arsenic poisoning (e.g., severe gastroenteritis, hypotension, shock). The full clinical picture is essential for diagnosis.

How to Approach the Question

This is a factual recall question that tests your knowledge of toxicology.
Identify the key phrase in the question: 'Garlic odour'.
Systematically review the options, recalling the classic signs associated with each type of poisoning.
Match the key sign (garlic odor) to the correct poison (Arsenic).
Eliminate the other options by recalling their distinct features: Cyanide (bitter almond), Lead (no odor, metallic taste), and Mercury (no odor).

Concept Tested & Keywords

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Practise the full NORCET 5 Prelims - Sept 2023 (Shift-2)

Attempt every question from this paper in a timed mock, then review the full solution for each one.