Rodenticide toxicity (Canine) — NAVLE Prep

Quick anchor

Trigger

Known bait ingestion or unexplained bleeding/neuro/renal pattern

First step

Identify rodenticide class if possible

Antidote clue

Vitamin K1 only for anticoagulants

Trap

Do not assume all rodenticides behave the same

Exam core — read this first

Big toxicology split → anticoagulant, bromethalin, and cholecalciferol rodenticides create different syndromes

Anticoagulant pattern → delayed bleeding and prolonged clotting times

Bromethalin pattern → acute neurologic signs from cerebral edema with no vitamin K benefit

Cholecalciferol pattern → hypercalcemia, hyperphosphatemia, and renal injury

Pattern recognition

Core pattern

Exposure history or bait accessBleeding, neuro signs, or hypercalcemia/AKI patternTiming depends on product class

Supporting clues

Epistaxis or dyspnea from bleedingTremors/seizures with bromethalinDepression and PU/PD with cholecalciferolRecent ingestion may still be asymptomaticProduct packaging can be decisive

NAVLE trigger: This is a “know the bait class” topic more than a single-syndrome topic.

Decision core — what NAVLE actually asks

Known recent ingestion, product identified

→ Decontamination and class-specific treatment should start before waiting for delayed disease to declare itself

Bleeding rodenticide pattern

→ Think anticoagulant toxicosis, vitamin K1, and blood-product support if severe

Neurologic or hypercalcemic pattern

→ Think bromethalin or cholecalciferol instead; vitamin K1 is not the universal answer

Key interpretation

Product identity

Critical

Often answers the question fastest

PT / coagulation

Prolonged first

Classic anticoagulant clue

Neurologic signs

Bromethalin concern

No vitamin K rescue here

Calcium / phosphorus

High in cholecalciferol

AKI risk follows

Bleeding delay

Common with anticoagulants

May not be immediate after ingestion

Blood products

May be needed

Severe anticoagulant bleeders may require plasma/transfusion support

⚠ Vitamin K1 is not the answer for every rodenticide. The bait class changes the entire treatment plan.

Treatment

Step 1

Identify the product and decontaminate recent ingestions when appropriate

This is the fastest route to the right branch of treatment.

Step 2

Anticoagulant cases: vitamin K1 plus blood products if active bleeding is severe

That is the high-yield classic antidote branch.

Step 3

Bromethalin/cholecalciferol cases: supportive care and toxin-specific monitoring, not reflex vitamin K1

Neurologic or hypercalcemic patterns need different management.

NAVLE traps — where students lose marks

Do not assume all rodenticides are anticoagulants

That is the main exam trap.

Vitamin K1 helps anticoagulant toxicosis, not bromethalin

Wrong antidote logic costs marks.

Anticoagulant cases can bleed after a delay

A recent ingestion may still look clinically quiet at first.

Hypercalcemia after rodenticide exposure points away from anticoagulants

That is cholecalciferol reasoning.

Differentials — how to separate these on NAVLE

Fast separator: The board is usually asking you to identify which rodenticide class fits the syndrome and then choose class-correct treatment.

Rodenticide type	Dominant syndrome	Lab clue	Key separator
Anticoagulant	Bleeding	Prolonged PT	Vitamin K1 branch
Bromethalin	Neurologic signs	No coagulopathy pattern	No vitamin K antidote
Cholecalciferol	Renal injury / depression	Hypercalcemia / hyperphosphatemia	Mineral derangement branch
Ethylene glycol	AKI / acidosis	Oxalate / acidosis clues	Not a rodenticide but a toxic renal mimic
Primary coagulopathy	Bleeding	No bait history necessarily	Broader differential if product unknown

30-second revision

Question 1Which rodenticide class is this?

Anticoagulant clueDelayed bleeding / prolonged PT

Bromethalin clueNeurologic signs

Cholecalciferol clueHypercalcemia / AKI

Critical trapVitamin K1 is not universal

Practice questions

Pre-built NAVLE-style · Rodenticide toxicity

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Q1Class recognition

A dog develops spontaneous bleeding several days after known rodenticide exposure. Which class is most likely?

Q2Antidote logic

For which rodenticide class is vitamin K1 the appropriate antidote branch?

Q3Pattern separation

A bait-exposed dog has neurologic signs without a coagulopathy pattern. Which rodenticide rises highest?

Q4Metabolic clue

Which lab abnormality most strongly supports cholecalciferol rodenticide toxicity?

Q5Trap question

Which statement about rodenticide toxicity is most accurate?