TOX Flashcards
When should poisoning be on the ddx
- Patient with ALOC – no obvious cause
- Inexplicable vital signs
- Inexplicable lab tests, EKG
- Symptoms look like a toxidrome
- Multiple patients w/ same sx’s
focused Hx with poisoning should focus on
Known, suspected or reported ingestion/exposure? 1. Anticipate: What class of substance was ingested? What does it (they) do?
mngmt of poisoning should involve
v. REVERSE with antidote, if possible
vi. REMOVE residual poison, if possible
vii. NEUTRALIZE circulating poison
viii. ENHANCE ELIMINATION of the poison
poison control number
1-800-411-8080
initial mangement of tox pt
ii. Breathing - O2 Sat, RR – effectively ventilating?
iii. Circulation – BP low or high?
iv. Cardiac rhythm? Tachy? Brady? Wide or narrow? Is it changing?
v. D & E is for Disability/Decontamination/Exposure
why is considering who called 911 important
did the person who ingested this want to be saved
other important hx question
when was it taken why etoh or alcohol PMH has this ever happened before
physical exam
i. Vital signs
ii. Cardiac rhythm – do they have a dysrhythmia?
iii. Level of consciousness, gag reflex
iv. Pupils - size and reactivity
v. Skin signs – sweaty, dry, hot, rash, track marks
vi. Bowel sounds – hyper-, hypoactive, are they present at all?
vii. Bladder distention
viii. Breath/body odor
ix. Evidence of trauma, focal
bowel sounds
toxidrome predictable of medicines
management of tox
• D-stick, EKG, Upreg right away • IV access, monitor, O2 • Acetaminophen (APAP) level • Chem, CBC, UA, Blood EtOH, Utox
why do you want to get a cmp
anion gap, electrolytes, renal, LFT’s),
get drug levels
- Digoxin
- Dilantin (ataxia; OD of Dilantin will make you not able to walk; they have a broad based ataxia like “drunk walking”), Carbamazepine, Valproic Acid
- Lithium
“Comprehensive” drug screens not helpful – take too long
• “Coma Cocktail”
- 50 cc of 50% glucose IV: (“Amp of D50”)
* Naloxone (Narcan®
• Naloxone (Narcan®)
reverses an opioid OD immediately. Narcan lasts about 45 mins. So if their OD is with a longer acting agent then they will come back for the 45 mins, the narcan wears off and they will go down again. Put soft restraints b/c they will wake up UNHAPPY, combative, and irritable
• 0.8-2 mg IN, IM, IV
when would you get a KUB
• KUB for select, ingested radiopaque substances
special labs you may need to order
- Calcium, Magnesium
- Total CK (rhabdomyolysis)
- PT/INR (hepatotoxic, coumadin)
- Serum osmolarity/osmolar gap
methods of removal
decontamination
• HAZMAT, protection for HCP
• Forced emesis**
• Surgical removal
Forced emesis**
b/c concerned about airway complications and esophageal rupture so don’t use this method
Rare: no syrup of ipecac
how do you neutralize
• 1 gm / kg administered orally • Repeat dosing for some drugs • Give with cathartic (Sorbitol) • Can be given pre-hospital • Not always useful, can be dangerous Antidote: known ingestion/exposure
ENHANCE ELIMINATIONhis look like and what do we use
- Whole bowel irrigation
* Go-Lytely - Dialysis, Hemofiltration
- Enhance urinary excretion
usually reserved for people who have ingested packets of drugs
i. Opiates tx
naloxone
ii. Acetaminophen tx
– N-acetylcysteine
1. NAC, Mucomyst
iii. Digoxin
– Digibind Fab-fragments
iv. Benzos -
flumazenil
v. Cyanide
- Lilly kit
vi. INH –
– pyridoxine
B6?
Carbon Monoxide
vii. Carbon Monoxide – oxygen
• Anticholinergics -
physostigmine
• Cholinergics
atropine, 2-PAM
• Beta blockers
glucagon (increases force and rate of contraction – chronotropic and ionotropic)
Ca channel blockers - TX
calcium
TricyclicsTX
Na bicarbonate
• Metals -TX
chelating agents
• Iron TX
deferoximine
• Warfarin (Coumadin TX
): Vitamin K
• Over-anticoagulation common
• Hold dose, check bleeding
Causes of osmolar gap
- Methanol
- Ethylene glycol
- Ethanol
- Isopropyl alcohol
- Others….
normal anion gap
Calculated
1. Normal = <10
AG calculation
Na) – (Chloride + TCO2); Normal 5-15
Things that show up on a plane film
- Chloral hydrate
- Heavy metals
- Iron
- Phenothiazines; Packets of drugs (body packers)
- Enteric coated pills
- Salicylates
charcoal does not work on these
- Iron
- Lithium
- Cyanide
- Pesticides
- Acids and alkalis
why would you give someone charcoal in a NG tube
losing airway is not good with this
black slurry
what are toxidromes
predictable effects of particular medication
Anticholinergic toxidrome
a. Mad as a hatter
b. Blind as a bat
c. Red as a beet
d. Dry as a bone
e. Hot as hell
- Flushed, dry skin
- Elevated temp, pulse
- Agitated delirium
- Hallucinations
- Dilated pupils
- Seizures
- ABSENT BOWEL SOUNDS
- Distended bladder
what medications cause anticholinergic SE
Benadryl scopolamine atropine TCA carbamazepine flexaril (muscle relaxer) plants
plants that cause anticholinergic SE
Jimson Weed, Belladonna
support for anticholinergic
a. Supportive: IV fluids, monitor
b. Charcoal, Benzo’s
c. Don’t sedate with antipsychoticà enhances anticholinergic effectà seizure, sicker
d. Critical? Physostigmine
Cholinergic toxidrome
SLUDGE
i. Salivation
ii. Lacrimation
iii. Urination
iv. Diaphoresis
v. GI upset
vi. Emesis
b. Bradycardia ,Wheezing
c. Constricted pupils (pinpoint)
d. Lethargy
what can cause a toxidrome
- Pesticides
* Organophosphates - Chemical Warfare agents
* Sarin, VX, etc
Tx fro cholinergic toxidrome
- Decontamination, supportive
- Atropine – muscarinic effects
- Pralidoxime (2-PAM) – both muscarinic and nicotinic effects
Cholinergic tx
- Decontamination, supportive
- Atropine – muscarinic effects
- Pralidoxime (2-PAM) – both muscarinic and nicotinic effects
sympathomemetic toxidrome
GO SPEED RACER
- Elevated BP, pulse, temp
- Can be really high
- Agitated delirium
- Seizures
- Dilated pupils
- Normal skin or sweating
- normal bowel sounds
- Bladder not distended
sympathomemetic drugs
- Cocaine, Amphetamines, Ecstasy
- Multiple formulations
- Caffeine
- Pseudoephedrine, Ma Huang (ephedra)
- Ritalin, Adderall, diet pills
sympathomemtic vs anticholinergic
NORMAL BOWEL SOUNDS
BLADDER NOT DISTENDED
sympathomemtic tx
a. IV fluids, Benzo’s, cooling
b. Control VS
c. Charcoal, Go-Lytely if ingested packets
classic triad of opiate toxidrome and 2 others
- Depressed LOC
* Lethargy to coma - Decreased respirations (4)
- Pinpoint pupils (miosis)
- Hypotension
- Pulmonary edema
opiates that cause sxs
- Heroin, methadone
- Morphine, Dilaudid, Meperidine (Demerol)
- Fentanyl - patches
- Codeine, Hydrocodone, Oxycodone
special opiates
- Lomotil
* Dextromethorphan
v. Serotonergic (Serotonin Syndrome) usually happens as a result of
• Most common w/ dose increase, addition of another to tx or overdose
Serotonergic toxidrome
- Agitated or comatose
- Elevated temperature, pulse
- Hypo- or hypertension
- Normal pupils
- Normal skin signs
- Increased reflexes
- Clonus -hold it and bounce
- “Wet dog” shakes
Serotonergic meds
- SSRI’s, SSNRI’s, MAOI’s
- SSRI’s + triptans
- Combo with pain meds
Serotonergic treatment
a. Withdraw offender, supportive
b. Benzo’s
Doesn’t fit a toxidrome? consider
i. Mixed ingestion/exposure
ii. Head trauma
iii. Infection
iv. Shock
v. Metabolic imbalance
** meningitis is possible
i. Common, silent, deadly: order level in ALL poisoned pt’s.
h. Acetaminophen
what levels are toxic for acetaminophem
7.5g in adults or 150mg/kg in kids is toxic
Timing of ingestion is key – 2-4hr first level
what is the APAP key
timing of ingestion is key – 2-4hr first level
what are sxs of apap
iv. Typically few sx’s first 24hrs
v. Then: RUQ abd pain, malaise, nausea
labs for APAP ingestion
ASA, CBC, Chem, UA, Upreg, EKG
ix. Serial levels every 4-6hrs depending on Hx
Treatment for APAP
- Charcoal if recent
2. N-acetylcysteine (NAC, Mucomyst) for 72hrs
Aspirin – Salicylates
i. Common, acute or chronic – slowed absorption, concretions
Early/mild sx’s ASA
Early/mild sx’s: tachycardia, tinnitus, n/v, abd pain, tachypnea, diaphoresis
Late/severe ASA sxs
Late/severe: coma, seziures, resp depression, non-cardiogenic pulmonary edema, dehydration, shock
how does chronic ASA tox occur
concretions
big ball of ASA hard to break up
severity of the ASA toxicity is directly related to the
iv. Severity = acid base imbalance
- Mild toxicity/first sign
alkalosis
- Progression
: resp alkalosis and AG metabolic acidosis
- Severe/progression
severe AG metabolic acidosis
labs for ASA
v. Labs: ASA, APAP, UA/Upreg, CBC, Chem, ABG, EKG, serial ASA levels
TX for ASA
ABC’s, IV hydration, charcoal w/o cathartic, alkalinize urine (bicarb)
Pt with persistent, inexplicable tachycardia?
vii. Pt with persistent, inexplicable tachycardia? Think aspirin
what amount of NSAIDS is toxic
ii. 100mg/kg usually benign; co-ingestion
>400mg/kg may be life-threatening
NSAIDS >400mg/kgsxs
- ALOC/coma, acidosis, seizures, pulmonary edema
k. Oral Hypoglycemics/Insulin sxs
i. Sx’s: ALOC, diaphoresis, tachycardia, bizarre behavior, paralysis, seizure – can mimic CVA
immediate dx with altered pts
ii. Immediate d-stick on ALL altered patients
sulfonyureas reversal
Sulfonylureas, Insulin – rapid reversal with 1 amp D50 after d-stick
iv. Metformin overdose
less profound hypoglycemia but lactic acidosis w/ AG present
The problem with oral hypoglycemics:
- They last a long time, longer than 1 amp D50
- Pt becomes repeatedly hypoglycemic
- Admit these folks with glucose rich IV drips
Insulin OD
– admit if severe. Can correct, watch for 6hrsàhome if stable, no risks, not suicide
vii. Feed everyone with hypoglycemic toxicity
amitriptyline
Nortriptyline
TCA
amitriptyline
Nortriptyline TCAs toxidrome
iii. Anticholinergic toxidrome
ECG chnages with anticholinergics
- First – sinus tach
- Terminal R-wave in aVR
- Widened QRS
- Ventricular tachycardia
other than an anticholinergic and EKG changes what other sxs do you see
v. Coma, seizures, hypotension
what is the reversal agent
vi. Charcoal, whole bowel irrigation
sxs of iron overdose
ii. Nausea, vomiting, abd pain, diarrhea
sith suspected iron overdose need to figure out
iii. Estimate amount and which prep
sxs of iron overdose
- AG metabolic acidosis
- WBC’s >15k
- Glucose >150
- Serum iron test
what dx tests for suspected iron
KUB good – Charcoal does not work
vin rose
Dexferoxamime
antidote for iron
sxs of digoxin
- N/V/D, bradyarrhythmias, hyperkalemia, CNS sx’s, EKG with specific findings
- Dig level, Digibind Fab if arrhythmias
BB overdose sxs
- Brady, hypotensive, ALOC, ventricular arrhythmias
labs for suspected digoxin overdose
- Dig level, Digibind Fab if arrhythmias
BB overdose treatments
- IV fluids, tx shock, charcoal if indicated
CCB tx
- Sx’s/Tx much like Beta Blockers – add Calcium
read flags with alcohol overdose
- EtOH level does not match sx’s
- Not “metabolizing” (getting less drunk) with time
- Trauma – do a good exam
- GI bleeding, abd pain, n/v
- Confusion, can’t walk
- Jaundice, bruising
can’t wait for chronic ETOH to get to 0
No need for zero level to d/c! Chronic etoh’ers will experience withdrawal sx’s at zero!
Refer for alcohol Tx
Benzo’s Rx for mild withdrawal sx’s
PE Signs:
- Tongue wag (fasiculations in the tongue), tremor
- Tachycardia
- Low grade temp
Red Flags fir alcohol withdraw
- Hallucinations, confusion
- Agitated delirium
- Seizure, asterixis
- Jaundice
tx for alcohol withdra
IV fluids, monitor, EKG, high vis bed
• Give thiamine IV
FEED THEM
LABS for alcohol withdraw
• Labs: CBC, Chem, PT/INR, Magnesium, Phosphorus
rx for alcohol withdrawal
- Benzo’s: Lorazepam 2-4mg IV until sx’s abate or need an airway
- Phenobarbital helps avoid Sz – long acting – give early
- IV 130-260mg q 30min until sedation or 1040mg
early sxs of mushrooms
iv. Early GI symptoms (w/in 2hrs) usually reassuring
delayed sxs of mushrooms
Delayed symptoms (>6hrs) associated with liver, kidney, CNS damage
labs for mushrooms
LFTSvi. Get LFT’s, coags, electrolytes, monitor closely
return to this slide
mushroom tx
. Amanita phalloides: delayed liver failure (day 3)
- Amanita Smithiana: delayed renal failure (day 3)
- Lepiota: delayed liver failure (day 3)
vii. Call Poison Control for ALL mushroom toxicity
onset of Rohypnol (flunitrazepam)
- Rohypnol (flunitrazepam): pill form, illegal in U.S.
a. Sedation, muscle relaxation, amnesia
b. 15-30min onset, lasts 4-6hrs; tablets now dissolve with blue color
GHB (gamma-hydroxybutyric acid onset
- 15min onset, lasts 3-4hrs, gone from body in 8hrs
2. Sedation, amnesia
ketamine
liquid/powder, onset in minutes, lasts up to 4hrs
1. Psychoactive, muscle paralysis, amnesia
OTC sedation
- Visine (tetrahydrozoline), Afrin (oxymetazoline), others
peak ingestion of one pill kill
i. Peak age of ingestion is 1-3yr olds
one pill kill list
- BIG ONE Calcium Channel Blockers – shock, brady arrhythmias
- Clonidine – opiate toxidrome
- Lomotil – opiate toxidrome
- Sulfonylureas – hypoglycemia, seizures, coma
- Cyclic Antidepressants – anticholinergic, dysrhythmias
- Salicylates – same sx’s as adults – more serious
hypoglycemia, seizures, coma in children
sulfonylureas
pepto bismol
oil of wintergreen
- Salicylates
Clonidine toxidrome
opiate toxidrome
Lomotil toxidrome
opiate toxidrome
carbon monozide poisoning seen most commonly
i. Common in winter months, cold climates – multiple sources
two major contributors to smoke inhalation deaths
ii. Major contributor to smoke inhalation deaths (cyanide too)
pathophys of CO poisoning
iv. CO binds to hemoglobin 200 times better than oxygen
1. Also binds to myoglobin, cytochromes P450 and AA3
v. Organs needing high O2 – brain, heart – affected
labs for CO poisoning
vii. Lab: carboxyhemoglobin (mild <20%, severe >40%)
1. Labs, lactic acid, ABG, EKG, troponin/myoglobin
tx for CO poisoning
viii. Tx: 100% Oxygen by non-rebreathing mask
1. Severe poisonings – hyperbaric oxygen chamber
near drowning
inhaling water
pathophysiology of near drowning
water causes loss of surfactant
Water swallowed, aspirated, alveolar flooding/loss of surfactant, hypoxia, lose airway reflexes, bradycardia, cardiac arrest, global CNS damage
better survival with cold water or warm water
cold better than warm
important questions for near drowning
a. Predisposing event: trauma, EtOH, hypoglycemia, seizure, MI, suicidal ideation, accidental
b. Clean or dirty water? Dove from height? Scuba diving?
labs for near drowning
ii. ABC’s first, CXR, +/- Head, C-spine CT, labs, CK, ABG
core temp <40.5 C (104.9) with normal mental status
- Heat exhaustion
Normal mental status, dehydrated, sweating, weak, n/v, HA
heat stroke sxs
va. ALOC, ataxia, dry/hot/flushed skin, +/- sweating
b. CNS, coagulation, liver, renal damage
heat stroke temp
core temp >40.5 C – life threatening
- Drugs associated with increased heat production
a. Cocaine, amphetamines, EtOH, salicylates
what do you search for with increased temp
what’s tx
a. D-stick, CBC, CMP, PT/INR, CK, TSH, UA, Upreg/tox
b. Tx: ABCDE’s, cooling (ice packs, fan/wet sheet), Tylenol or NSAIDS do not work here
- Malignant hyperthermia
rare, genetic, precipitated by anesthesia drugs: muscle rigidity, rhabdo
osborne waves are associated with hypo or hyperthermia
hypo
primary hypothermia
exposure, EtOH, elderly, infants, immersion
Secondary hypothermia
Sepsis, trauma, CVA, endocrine
- Iatrogenic hypothermia
: IV fluids not warmed, ambient temp
kids: mammalian diving reflex
iv. Metabolism slows – kids: mammalian diving reflex
multi systems involved in hypotension
- Cardiac – gentle handling to avoid dysrhythmias
a. Tach Brady, Osborn wave on EKG - CNS – clumsy, confusion, shivering
tx for hypotension
remove/tx cause, d-stick, EKG, upreg, warm IV fluids and O2, Bear-Hugger rewarming pad, feed
i. Snake bites**
none proven – immobilize/transport best
a. Keep the pt still