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Paediatric Toxicology

SSEM Sept 2012 by Dr. Mark Little

24 th Oct 2012

Dr. Julia Ng

Emergency Physician

Take Home Message

• Most children age 1-2 y.o

• Most harmless substance

• Most do not need hospital care

• Death or serious harm is exceptionally rare

• Small list of 1-2 tablets can kill children

Management

• Resuscitation ABCDE

• D detect and correct 1) seizure using benzo benzo and benzo, no phenytoin

2) hypoglycemia

3) hyper or hypothermia eg serotonin

• E emergency antidote - naloxone sodium bicar

• Risk assessment

• Agent eg carbamazepine 50mg/kg

• Dose

• Time since ingestion

• Clinical features and progress

• Patient factors eg weight, comorbidities

• Supportive

• Investigation

• Decontamination

• Enhanced elimination

• Antidote

• Disposition

Risk assessment in children

• Dose- response in mg/kg is usually the same as for adults

• Children rarely ingested > 2-3 tablets

• Exact dose and time may be difficult to estimate

• May need to resort to a ' worst case scenario '

• Assume the time of ingestion is the latest possible

• Assume all missing tablets have been ingested

• Do not attempt to account for spillage

• If more than one child is involved, assume each child ingested the amount

• Consider NAI in large and repeated dose

Investigation

• Routine investigation :

• Paracetamol and ECG for cardio toxicity

• Paracetamol can be occult

List of 1-2 tablets lethal in children !

• Amphetamine

• Clonidine

• Calcium channel

• Chloroquine hydrochloride

• Dextroproxyphine -VT

• Propranolol

• Opioids

• Sulphonyureas

• Theophylline

• TCA

Unknown pill

• Admit 12hours for unknown pills

• Ability to ETT/BVM

• No IVC if alert and running

• If flop check BSL

• Monitor for level of consciousness and vital signs

Case 1

• 2 y.o old was brought to triage by mother, ate

1-2 pellets

Ratsak

• Long acting warfarin - up to 6-8 months

• Kids ingested 1 packet to have significant poison

• Adults 3 packets to be toxic

• Discharged home from triage, no need for blood test

If delibrated self harm,

• Check INR first

• no vitamins K

• if toxic may need 100mg vit K for 3-6 months

• Serial INR check

• If INR> 2-3, intervene

Case 2

• 2 y.o brought into ED :

• Drowsy

• RR 8

• Pinpoint pupil

• What is the toxidrome ?

opioid

• Check undisturbed RR

• If < 10 , need intervention : naloxone

• Dose ?

• Alternative vital ETCO

• If need a second dose of naloxone , start an infusion at 2/3 of reversal dose.

• Especially if it is overnight

Case 3

• 2.y.o has been playing , possibly ingested grandmother’s antihypertensive medication in a dosette box.

• Grandmother is on a beta blcoker.

• Is this dangerous ?

Case 3

• Atenolol and metoprolol in kids usualy cause slight lower BP and reduced PR

• Settled with fluid

• But propranolol and sotalol the worst :

• Propranolol – CNS and class I sodium channel blockade

• Sotalol – K channel blockade, QT prolongation

Case 4

• 2 y.o girl was brought to ED ingested 5mg glipizide.

• Is this a concern ?

Case 4

• Up to 8 hours course of hypoglycaemia

• Dextrose 10% only in adult due to high volume infusion

• Used octretide – stop release of insulin and safe

• Dose ?

Case 5

• 2 y.o boy has ingested 2 lomotil tablets 1 hour ago presented to triage.

• Triage nurse thought it only causes constipation as a result but come to ask you if she can discharge the child and maybe suggest some laxative if constipated.

• What do you do ?

Case 5

• Has anticholinergic ( atropine 23 mcg ) and opioid ( diphenoxylate 2.5mg )

• Symptom onset within 4 hours

Case 6

• 2 children , siblings, had been playing with a bottle of 100% eucalyptus oil and ? ingestion

Case 6

• First sign : coughing

• Implies pneumonitis

• Within 2 hour drowsy

• Then seizure and coma usually short lived

• If asymptomatic by 4-6 hours, safe for discharge

Case 7

• 2 y.o ingested grandfather’s digoxin.

• Is this dangerous ?

• Toxic lethal dose 4mg for child

• Sign of vomiting within 4 hours

Case 8

• 2 y.o ingested unknown amount of iron tablet

Is this a concern ?

Case 8

• If < 40mg/kg elemental iron, no vomiting

• AXR to count the tablets to work out dose per kg

• Progressive lowering of Bicarbonate level

• Treatment is to maintain HCO > 18

Case 9

• 2 y.o ingested grandfather ‘s colchicine

Case 9

• Vomiting early within 2 hours

• Lethal dose 0.5mg/kg -0.8mg/kg

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