Upload
others
View
4
Download
0
Embed Size (px)
Citation preview
12/19/15
1
Holiday toxins
Jus$ne A. Lee, DVM, DACVECC, DABT CEO, VETgirl [email protected]
Garret Pach$nger, VMD, DACVECC COO, VETgirl [email protected]
Garret Pach$nger, VMD, DACVECC
COO, VETgirl
Introduc$on
Jus$ne A. Lee, DVM,
DACVECC, DABT
CEO, VETgirl
Introduc$on Conflict of Interest Disclosure
• The tech-‐savvy way to get online veterinary CE! • A subscrip$on-‐based podcast and webinar service offering veterinary RACE-‐approved CE
VETgirl…On-‐The-‐Run
50-‐60 podcasts/year plus 24+ hours of webinars!
– $199/year – 30+ hours of RACE-‐CE
VETgirl ELITE
12/19/15
2
VETgirl TEAM memberships!
• Up to 5 members: $599/year
• Up to 10 members: $999/year
• > 10 members: $1399/year
• > 20 members: Ping us
Easier playback, less buffering – be`er!
New and improved video! Download our iTunes podcasts free!
Social media and our blog! Logis$cs: CE Cer$ficates ! No need to raise your hand! ! Type in ques$ons
! Emailed to you 48 hours afer the webinar ! Ac$ve par$cipa$on = no quiz
! Watching video later, must complete quiz ! ELITE members only
! Email / contact with ANY ques$ons
12/19/15
3
Call in from Smart Phone! Goals of the lecture
• Review of common holiday toxicants! – Mechanism of ac$on
– Clinical signs – How to treat!
CHOCOLATE
Chocolate • Naturally occurring alkaloids from the Theobrema cacao
plant
• Methylated xanthines: – Theobromine – Caffeine
• Associated with all the holidays! – Easter – Halloween – Christmas
Chocolate
• Chocolate bezoar – Slow absorption! – OK to induce emesis even hours out
• Very long T½: 17 hours " treat until clinical signs resolve (typically 1-2 days; up to 3-4 days)
Chocolate: Toxic doses • Methylxanthines (theobromine + caffeine) = toxic! • It’s the dose that makes the poison…
Product Theobromine Caffeine
White chocolate 0.25 mg/oz 0.85 mg/oz
Milk chocolate 44-‐60 mg/oz 6 mg/oz
Dark semisweet 135 mg/oz 20 mg/oz
Unsweetened baker’s chocolate
390-‐450 mg/oz 47 mg/oz
Dry cacoa powder 400-‐737 mg/oz 70 mg/oz
Craft EM, Powell LL., 5 MVC
12/19/15
4
Great free ASPCA APCC resources!
• h`p://aspcapro.org/freebies • Free app!
• When do you see signs? (Theobromine) – Mild signs (agitation, vomiting, diarrhea): 20 mg/kg – Moderate signs (tachycardia, hypertension): 40-50 mg/kg – Severe signs (tremors, seizures): 60 mg/kg
• Clinical signs: – GI: Vomiting, diarrhea, hypersalivation – CARDIAC: tachycardia, VPCs, SVTs, hypertension – CNS: hyperactivity, tremors, seizures – MISC: polyuria, hyperthermia
Chocolate
Craft EM, Powell LL., 5 MVC
Decision to hospitalize?
• Based on $me since inges$on
• Based on emesis produc$on
• Based on pet owner ($$)
• Based on presence of clinical signs
Chocolate: Treatment • Decontamination:
– Delayed emesis – Multiple doses of activated
charcoal (AC) – Anti-emetic therapy or pro-
kinetics
• Supportive – IV fluids + frequent walks – No need for UCS – Sedation – Temperature monitoring – Anti-convulsant therapy
• If HR or BP > 180 bpm " sedate! – Acepromazine – More acepromazine – Butorphanol
• Monitoring: – Beta-blocker therapy (if HR >
180) – ECG monitoring
Grapes and raisins • Discovered 2001
– Red, green, seedless, seeded – Grape seed extract OK? – Sources: trail mix, grape juice, etc. – Baking process?
• Eubig et al and VIN: – Grapes: 0.7 oz/kg – Raisins: 0.11oz/kg
• More than a handful? – Idiosyncratic?
Grapes and Raisins
• Clinical signs: – Anorexia – Vomiting – Diarrhea – Kidney pain – Azotemia – Oliguria (0.5-1 ml/kg/hr) – Anuria (< 0.5 ml/kg hr)
• Azotemic? R/O nephrotoxicants: – Grapes/raisins/currants – NSAIDs – Ethylene glycol
12/19/15
5
So how aggressive do we treat Vitus spp.? • Decontamination
– Delayed emesis induction ok! – Activated charcoal + sorbitol X 1
• Anti-emetics
• Aggressive IV fluids X 24-48 hours – PCV/TS 35%/5 mg/dL – UOP?
• Monitoring clinicopathologic tests
• Gastric protectants if azotemic
So how aggressive do we treat Vitus spp.?
• Treat it like it was your dog
• 50% “unaffected”
Harper, 3 yo black lab, 30 kgs • PC: ingested 12 oz. raisins 3 days prior – o unaware of toxicity
– Vomiting, loose stool, anorexia, depression X 24 hours
• PMHX: healthy
• Went to RDVM: – CBC/CHEM:
• BUN: 180 mg/dL • Creatinine 5.4 mg/dL " referred
• Presentation: – T: 100.2°F, HR 80, RR 16 – 5% dry – Mild abdominal and renal pain, no palpable bladder
Harper • Diagnostics:
– Venous blood gas – Catheterize, empty bladder, quantitate urine, pull UA,
CULTURE • FAST U/S – no bladder seen • 10 mls
• Treatment – Bolused 1 liter LRS IV once
• Post-bolus, small bladder seen on FAST U/S – Blood pressure 170/100 mmHg (MAP 150 mmHg) – Gastrointestinal protectants
• Famotidine 0.5 mg/g IV q. 24 • Aluminum hydroxide 10 mls PO q. 8 • Sucralfate 1 gram PO q. 8
– Ampicillin 22 mg/kg IV q. 8
Harper • Treatment:
– Antihypertensives: • Enalapril 0.5 mg/kg PO SID • Hydralazine 0.5 mg/kg PO BID
– Anti-emetics: • Maropitant 1 mg/kg SC SID
– Blood pressure monitoring – UOP monitoring (UCS)
Day 2 229 11
Day 3 300 14.7
Day 4 >300 18
Day 5 >300 22
Day 8 32 0.8
200-300 ml/hr
100 ml/hr
50 ml/hr
20 ml/hr; bolused 1 L
400 ml/hr
BUN mg/dL Creat mg/dL UOP Fluid rate PCV TS kg
35 5
30 4
30 4
34 6
27 4
Oliguric
Oliguric
Oliguric
Anuric
13 ml/kg/hr
33
33
35
31
31
ALCOHOL
12/19/15
6
Common sources of alcohol
• Ethyl alcohol (ethanol) – Liqueurs – Wine – Beer – Eggnog!
• Other sources: – Unbaked bread dough – Baked goods soaked with alcohol – Chocolate candies with liqueurs
Alcohol: Clinical signs
• Ataxia • Drunkenness • Altered menta$on • Seda$on • Bradycardia • Hypoven$la$on • Tremors/seizures • Vomi$ng
Alcohols
• Clinicopathologic tes$ng: – Hypoglycemia
– Metabolic acidosis
• Treatment: – Too late for decontamina$on?
– NO charcoal! – Symptoma$c suppor$ve care
Unbaked bread dough
• Yeast!
• Products: – Pizza dough – Starter kits – Roll products
• Timing: – Holiday toxin
Unbaked bread dough • Stomach = oven
• CO2 and ethanol gas
• Clinical signs: – GI: hypersalivation, retching, bloat, abdominal
distension, GDV, abdominal pain – Ethanol toxicosis: ataxia, blindness, bradycardia,
vocalization, hypoglycemia, m. acidosis
Treatment: Unbaked bread dough • Decontamination if ASX
– ACC X1? Meh – Cold water lavage
• IV fluids • Anti-emetics • Dextrose monitoring and supplementation • Thermoregulation • Surgery?
12/19/15
7
CAFFEINE
Caffeine
• Biggest cause of fatalities in poisoned patients
• Commonly found in high concentration: – Coffee bean sources – Tea – Diet pills – Herbal products (guarana) – Caffeine stimulant tablets
Caffeine: Toxic doses
• > 15 mg/kg: Agitation • > 25 mg/kg: Moderate signs • > 50 mg/kg: Cardiotoxic • 140 mg/kg: LD50 (for dogs) • 80-150 mg/kg: LD50 (for cats)
Caffeine
• See clinical signs within 30 minutes – Similar signs to theobromine – Often too late for decontamination?
• Short half-life! 4.5 hours
• Signs resolve within 12-36 hours
• Same treatment as theobromine
Caffeine • Blood pressure and ECG monitoring
• Fluid therapy
• Sedation (if hypertensive, tachycardiac)
• Beta-blocker therapy
• Anti-convulsant therapy
Macadamia nuts • Macadamia intergrifolia or tetraphylla tree
• Most common unknown toxicant
• Unknown MOA – Affects neurotransmitters, neuromuscular
junctions, muscle fibers?
12/19/15
8
Macadamia nuts • Clinical signs seen in 12 hours, resolve in
24-48 hours
• Toxic dose: 0.7-2 g/kg or 1 nut/kg body weight
Macadamia nuts • Clinical signs:
– CNS: weakness, ataxia, tremoring, recumbent – GI: vomiting, colic, pancreatitis – MS/NEURO: lameness, hind limb weakness, joint pain
• Blood work: – #cPL – #WBC, – #ALK PHOS – #triglycerides
Macadamia nuts: Treatment
• If toxic dose ingested, decontamination: – Emesis – ACC X1
• Anti-emetic therapy
• Symptomatic supportive care
• Monitor for pancreatitis!
Poinsesas: Euphorbia pulcherrima
• Don’t propagate the myth!
• Milky sap (latex) " mild irritant
• Irritant to: – Gastrointes$nal tract – Dermal
– Ocular
Christmas Cactus: Schlumbergera bridgesii
• General GI irritant
American Mistletoe: Phoradendron flavescens
• Considered toxic due to toxicants: – Toxalbumin
– Lec$ns – Phoratoxins
• Toxicosis: – GI (e.g., vomi$ng, diarrhea)
– CARDIAC (e.g., collapse, bradycardia, hypotension)
– CNS (e.g., hallucinogenic, erra$c behavior)
12/19/15
9
Glo jewelry • OK to monitor at home!
• Flush out mouth
• Offender: dibutyl phthalate (DBP) – Oily, bitter liquid!
• Treatment: – Any dermal exposure? – Flush mouth – Bath with liquid dish soap
De-icing salts
• Mildly toxic
• Typically high concentra$ons of NaCl, CaCl, MgCl, KCl
De-icing salts: Clinical signs
• Gastrointestinal: – Hypersalivation – Anorexia – Vomiting – Diarrhea
• Dermal irritation
• Electrolyte abnormalities
De-icing salts: Treatment
• Decontamination – NO activated charcoal
• IV fluids – 0.45% saline + 2.5% dextrose
• Anti-emetics
• Electrolyte monitoring
ETHYLENE GLYCOL
Ethylene glycol (EG)
• Not common but deadly
• Sources: – Radiator coolant – Windshield deicer agents – Motor oils – Hydraulic brake fluid – Developing solu$ons – Paints – Solvents
12/19/15
10
Ethylene glycol (EG)
• Dose makes the poison!
• Narrow margin of safety
• Toxic dose: – Cats: 1.4 ml/kg – Dogs: 4.4 ml/kg
– LD50 dogs: 4.2-‐6.6 mL/kg – LD50 cats: 1.5 mL/kg
• Metabolites " CaOx crystalluria " AKI
Ethylene glycol (EG): Clinical signs
• Stage 1 (30 min-‐12 hours): ataxia, hypersaliva$on, vomi$ng, pu/pd
• Stage 2 (12-‐24 hours): Resolu$on, tachycardia, tachypnea, dehydra$on
• Stage 3 (36-‐72 hours, dogs; 12-‐24 hours, cats): Azotemia, coma, AKI
Ethylene glycol (EG): Diagnosis • Venous blood gas
– Metabolic acidosis (pH < 7.35, low HCO3, -‐BE) – ↑osmolality, anion gap & osmolar gap – May see hypocalcemia or hyperglycemia (50%)
• Urinalysis – CaOx crystalluria (as early as 3-‐8 hours) post-‐inges$on
Ethylene Glycol: Clinicopathologic Findings
• EG test – + in first 24 hours – Ideally: human quan$ta$ve test
• Veterinary test kits & cats – False +: sorbitol, alcohol, propylene glycol, mannitol
Ethylene glycol (EG): Treatment
• Decontamina$on? – < 1 hour: emesis? – NO ac$vated charcoal!
• Fluid therapy
• ANTIDOTE: inhibit EG conversion to dangerous metabolites (alcohol dehydrogenase) – Must be started ASAP! – Dogs: < 8-‐12 hours – Cats: < 3 hours
• Choices for an$dotes – 4-‐MP (fomepizole) – Ethanol
Ethylene glycol: Treatment
• Ideally 4-‐MP
• Alterna$vely: ethanol – Readily available but…
• CNS depression • Serum hyperosmolality
• Osmo$c diuresis
• Metabolic acidosis
• Hypoglycemia
• Gastrointes$nal signs (e.g., significant vomi$ng " aspira$on)
12/19/15
11
Ethylene Glycol: 4-MP
• Dogs – 20 mg/kg IV – 15 mg/kg IV @12,24,36 hours
• Cats – 125 mg/kg slow IV loading dose – 31.25 mg/kg @ 12, 24, 36 hours
• In cats treated @ 3 hours w/ 4-‐mp 100% survival – ethanol 25% survival
• In cats treated @ 4 hours w/ 4-‐mp 0% survival – ethanol 0% survival
– Once azotemic " grave prognosis
Connally et al. JVECC2010
BUT HOW DO I MAKE ALCOHOL CRI’S?
Ethylene Glycol: Treatment • Go buy some concentrated alcohol (ethanol, ETOH)
– Proof = ½ the alcohol content – 100 proof grain alcohol = 50% ETOH – 190 proof vodka = 95% ETOH – Clear stuff only!
• Make a 7% ethanol solu$on from 80 proof Vodka
• C1 x V1 = C2 x V2 – C1 = .40 (40%) – C2 = .07 (.07%) – V2 = 1000 mls – .40 (X) = .07 * 1000 – X = 175 mls
Ethylene Glycol: Treatment • C1 x V1 = C2 x V2
– .40 (X) = .07 * 1000 – X = 175 mls
• Next steps? – Remove 175ml from a 1L bag of saline
– Add 175 ml of a 80 proof vodka • 190 proof: remove 74 ml from a 1L bag of saline
• Add 74 ml of the grain alcohol " 7% ETOH solu$on
• DOSE: Loading dose of 8.6 ml/kg (7% ETOH) slow IV – CRI of 1.43 ml/kg/hr
Addi$onal treatment
• Nursing care • Venous blood gas/renal panel/blood glucose • An$-‐eme$cs
• Fluid therapy • UOP monitoring
• Suppor$ve care
Ethylene glycol (EG): Prognosis
• Prognosis is grave if… – Cats: > 3 hours – Dogs: > 12 hours – No hemodialysis or CRRT available – Already azotemic
12/19/15
12
HUMAN MEDICATIONS
• Analgesic and an$pyre$c
• OTC pain relievers (Tylenol) and a wide variety of cold, flu, and allergy medicines.
• Cats are very suscep$ble to acetaminophen toxicity – Lack glucuronyl transferase; cannot metabolize via glucuronida$on
Acetaminophen
• Toxicity – Cats: 10 -‐ 60 mg/kg – Dogs: 100 -‐ 150 mg/kg
Acetaminophen • Signs occur 1-‐2 hours afer inges$on
• Early signs: anorexia, saliva$on, vomi$ng, facial and paw edema with lacrima$on and pruritus
• Later / progressive signs: depression, methemoglobinemia, Heinz body anemia, hemoglobinemia, hemoglobinuria
Clinical signs in cats
• Develop later than with cats
• Hemolysis and icterus develop in 2-‐7 days of toxicity
• Cyanosis with higher doses develops within 4-‐12 hours due to methemoglobinemia and anemia
• Depression, anorexia, vomi$ng, abdominal pain, with progression to liver failure
• Methemoglobinemia, hemoglobinemia, and hemoglobinuria in large doses (> 200 mg/kg)
Clinical signs in dogs: • Diagnosis
– Cats: • Methemoglobinemia • Heinz body forma$on
– Dogs • Elevated liver enzymes (ALT, AST)
Acetaminophen
• Treatment – Decontamina$on:
• Emesis: if recent inges$on < 15 minutes • Gastric lavage? • A/C (with cathar$c) afer lavage/emesis
12/19/15
13
• Fluid therapy
• IV fluids at 1.5-‐2.5X maintenance to maintain perfusion
• If severe metabolic acidosis (pH < 7.1), can consider sodium bicarbonate
Acetaminophen: Treatment • Treatment
– SAM-‐E (Denosyl®) • Increases hepa$c glutathione levels • Dose: 40 mg/kg PO to load, then 18 mg/kg every 24 hours X 30 days un$l liver enzymes resume to normal levels (ACVIM 2010)
– Ascorbic Acid: • Reduce methemoglobin to hemoglobin. Dose: 20-‐30 mg/kg PO, SQ, or IV every 6 hours x 3 days
– Cime$dine: No longer recommended for cats and dogs!
Acetaminophen
• N-‐acetylcysteine (NAC): – Should be given within first 8-‐12 hours
• Mucomyst® -‐ can be given IV – Fitered using a 0.22 micron filter – Dilute appropriately
• Mucomyst® orally – Dilute the 10 or 20% solu$on with a 5% Dextrose Solu$on (D5W) to a final concentra$on of 5%
Acetaminophen: Antidote Antidepressants
• Most common type: SSRIs
• Selective serotonin re-uptake inhibitors (SSRIs)
• Tricyclic antidepressants
• Other drugs affecting norepinephrine or serotonin
SSRIs: How do they work? • Inhibit the reuptake of serotonin at the presynaptic membrane
• More serotonin " more serotonin syndrome!
Permission granted Dr. Joe Stirt from http://www.bookofjoe.com/2005/03/07/
Amphetamines • Recognize! • Ritalin or Concerta (methylphenidate) • Vyvanse (lisdexamfetamine) • Adderall (dextroamphetamine /amphetamine) • D-amphetamine (Dexedrine)
• Similar to crystal meth!
12/19/15
14
What are amphetamines used for?
• #1 ADD/ADHD – College kids
• Illegal purposes (street drug) • Narcolepsy • Obesity (weight loss)
Amphetamines: How do these drugs work?
• Sympathomimetics!
• Similar to norepinephrine " stimulate alpha and beta-adrenergic receptors
• CS: Overstimulation!
Clinical signs from SSRI & amphetamines
• CARDIAC: hypertension, tachycardiac
• CNS: sedation or agitation, mydriasis, ear flicking, vocalization, tremors, head bobbing, seizures
• GI: drooling, vomiting, diarrhea
• RESP: panting (to blow off heat)
• MISC: Hyperthermia secondary to tremors
• How do we treat it? Same as SSRIs!
Do we decontaminate? • Is it asymptomatic?
• Rapid onset of clinical signs
• Should you have the pet owner do it? (NO) – Best done in clinic once TPR is assessed – If asymptomatic – If recent ingestion (< 1 hour)
Should we give charcoal?
• If ASX " one dose of activated charcoal + cathartic (ACC)
• If extra letters behind brand name (e.g., XR, ER, SR, etc.), give multiple doses of AC – No sorbitol with additional doses
Treatment • IV fluids:
– Aids in enhanced urinary elimination • Amphetamines only
– Keeps them cool if hyperthermic – Minimizes risk of myoglobinuria damage
• Hyperthermia: – Stop the tremoring " sedatives/methobarbamol – Provide cooling measures if > 40.5ºC/105ºF – Stop cooling measures if 39.7ºC/103.5ºF
12/19/15
15
Treatment Monitoring:
– Check TPR " monitor blood pressure and ECG – When do we care? > 180 bpm /180 mmHg
Anxiolytics: – If anxious, tachycardiac, hypertensive " – Acepromazine
• 0.05-0.1 mg/kg IV, IM, or SQ, titrated to effect • Plumbs: Do not “exceed 3 mg total”
Treatment • Tachycardia (HR > 170-180 bpm):
– Check stat BP • Typically hypertensive with SSRI/ADD medications "
– Anxiolytics (more acepromazine) – Anxiolytics (more acepromazine + butorphanol?)
• Still tachycardiac? – Beta-blocker (propranolol 0.02-0.06 mg/kg IV)
• Tremors: – Methocarbamol 44-‐220 mg/kg IV or PO q. 6-‐8 – Ideally IV – “Do not exceed 330 mg/kg/day” ☺ – Rectal absorp$on?
Treatment: • Serotonin syndrome
– Serotonin antagonist " cyproheptadine
– Consider PO or rectal administra$on
– Dogs: 1.1 mg/kg q. 6-‐8-‐12 hours – Cats: 2-‐4 mg total q. 6-‐8-‐12 hours
• Seizures: – Stop the seizure!
• Phenobarbital 4-16 mg/kg IV or PO PRN, titrated to effect • Diazepam 0.25-0.5 mg/kg IV PRN, titrated to effect
• Sugar-free, natural sweetener
• Found in everything! – Sugar free gums, candies, mints – Chewable multivitamins – Baked goods – Mouthwashes – Toothpastes – Anything “sugar-free” – Peanut butter
Xylitol
Xylitol
• Variable amounts in everything – 2 mg -1 gm/piece of gum is average
• How toxic is it? – > 0.1 g/kg " hypoglycemia – > 0.5 g/kg " acute hepatic necrosis
• Clinical signs: – Signs of hypoglycemia: weakness, collapse, vomiting, ataxia (< 1 hour) – Liver injury (days later)
How do we treat xylitol toxicosis?
• STAT blood glucose (BG) + chemistry – Is the patient hypoglycemic? – Treat if BG < 60 mg/dL
• 1 mL/kg 50% dextrose IV diluted 1:3
• Decontamination – Delayed emesis induction if asymptomatic! – No need for activated charcoal!
• Treatment: – BG monitoring with dextrose CRI in IVF – SAM-e – Baseline chemistry q. 24 hours X 2 days
12/19/15
16
• Pets ofen ingest ba`eries when chewing up: – Remote controls – Toys – Calculators – Watches
• Chewed = alkaline gel is released
Batteries • Most ba`eries are alkaline
• Chewed: – Oral pain – Hypersaliva$on – Anorexia – Oral inflamma$on or ulcera$on – Dysphagia – Vomi$ng – Abdominal pain – Melena.
• Because of their size, ba`eries can also result in GI obstruc$on.
Batteries
• If swallowed whole – Radiographs – Iden$fy the loca$on of the ba`ery
• Endoscopy or surgery
• Prognosis may be good to guarded, depending on if the ba`ery was chewed or ruptured and the presence, severity, and loca$on of any chemical burns.
Batteries Call for advice!
• Beware of holiday poisons!
• Save your faxes!
• VIN
• Call ASPCA Animal Poison Control Center – Chocolate wheel! – Free app!
#CPRwheel
12/19/15
17
Check out our 2015 upcoming VETgirl appearances!
Dr. Jus$ne Lee • NAVC, Jan 2016 • IVS, Fiji, Feb 2016 • WVC, March 2016 • AAHA, March 2016 • AVMA, July 2016
Dr. Garret Pach$nger • NAVC, Jan 2016 • WVC, March 2016
@VetGirlOnTheRun
VetGirlOnTheRun
This material is copyrighted by VETgirl, LLC. None of the materials provided may be used, reproduced or transmitted, in whole or in part, in any form or by any means, electronic or otherwise, including photocopying, recording or the use of any information storage and retrieval system, without the consent of VETgirl, LLC. Unless expressly stated otherwise, the findings, interpretations and conclusions expressed do not necessarily represent the views of VETgirl, LLC. Medical information here should be references by the practitioner prior to use. Under no circumstances shall VETgirl, LLC. be liable for any loss, damage, liability or expense incurred or suffered that is claimed to have resulted from the use of the information provided including, without limitation, any fault, error, omission, interruption or delay with respect thereto. If you have any questions regarding the information provided, please contact [email protected]