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Therapeutics #3 - Intro to Poisoning/Toxicology
N/a
21
Pharmacology
Graduate
10/31/2009

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Cards

Term
Major Functions of a Regional Poison Control Center (PCC)
Definition
provide poison information to health professionals & general public; use written guidelines for triage assessment & management of poisoned pts; collect & report statistical data on poisoning; provide poison prevention information to public; train healthcare professionals in toxicology
Term
Typical calls received by IPC
Definition
home calls: pediatric unintentional ingestions, therapeutic error, occupational, environmental, abuse/suicide; health care facility calls: suicide attempts, abuse/drug packers, occupational, unintentional pediatric, accidental occular, iatrogenic error; miscellaneous calls: Hazmat, mass casualty preparedness/drills, information calls
Term
Trends in Toxicology
Definition
poisoning is 2nd leading cause of injury-related death; prescription drug abuse exceeds illicit drug abuse; increase in Rx drug usage overall
Term
Poison centers save society money through:
Definition
preventing unnecessary healthcare visits, decreasing admissions to hospitals, and decreasing LOS (length of stays) at hospitals; estimated potential savings for IL is $97 - 159 million dollars in 2008
Term
How Pharmacists can use PCC
Definition
poison information/recommendations; antidotes; pill IDs (healthcare & law enforcement ONLY); drug information
Term
Poison Prevention for Medications
Definition
use child resistant packaging; don't refer to meds as "candy" to children; do not take in front of children; read label every time before taking; don't take medication in the dark
Term
Poison Prevention for Household Chemicals
Definition
store products in original containers; don't store with food substances; do not mix cleaning products; don't leave unattended
Term
Minimizing Accidental Overdose & Therapeutic Error
Definition
improve written & verbal medication instructions; ensure pt or caregiver understands dosing device; increase poison prevention activities & education
Term
Gastrointestinal Decontamination
Definition
ipecac, activated charcoal, whole bowel irrigation, gastric lavage
Term
Ipecac
Definition
used as an emetic; Rationale: remove poison from GI tract ASAP; vomiting only removes 28-82% OF stomach contents; does not reduce # of pts requiring HCF evaluation; does not improve outcome; numerous C/I's & ADRs; do not keep in home; IPC Recommendation: Do not use for any poisonings EVER!
Term
Activated Charcoal
Definition
highly porous material with large surface area; Rationale: comes in contact with & adsorbs poisons in GI tract, reducing systemic toxicity; binds to other drugs to varying degrees; most effective if adminstered within 1 hr; Primary complication: aspiration; C/I's: unprotected airway, caustic ingestion; use will not prevent hospital visit; IPC Recommendation: do not stock in home
Term
Gastric Lavage
Definition
involves instillation & aspiration of small volumes of fluid via an orogastric tube with intent of removing toxic substances from stomach; C/I's: unprotected airway, ingestion of corrosive substance or hydrocarbon; Complications: aspiration pneumonia; Indications: ingestion of potentially life-threatening amount of a poison & procedure can be performed within 1 hr or ingestion
Term
Whole Bowel Irrigation
Definition
enteral adminstration of large amounts of osmotically balanced fluid (PEG-ES); Rationale: flush substances out of GI tract begore absorption can occur; Recommended dose for adults: 1500-2000 mL/hr via NG tube until stools are clear; Minimal evidence on efficacy; C/I's: unprotected airways, hemodynamic instability, ileus, bowel obstruction, intractable vomiting, GI hemorrhage; Indications: toxins not absorbed by activated charcoal, drug packets, modified release pharmaceuticals
Term
Acetaminophen toxicity
Definition
most common cause of acute liver failure in US; drug itself is minimally toxic; one metabolite (NAPQI) causes hepatotoxicity (at therapeutic doses, liver inactivates it with glutathione); an overdose causes very high levels of NAPQI that depletes normal glutathione stores allowing NAPQI to react directly with liver cells & destroys them
Term
Toxic Dose of Single Acute Ingestion
Definition
200 mg/kg or 10 grams, whichever is less
Term
Toxic Dose for Chronic Ingestion in Adults
Definition
150 mg/kg per 24 hr period over preceeding 48 hrs OR 100 mg/kg per 24 hr period over preceding 72 hrs
Term
Symptoms/Presentation of Acetaminophen Toxicity
Definition
Early on: minimal symptoms, possible nausea/vomiting, malaise; After 24-48 hrs: increasing RUQ abdominal pain, AST/ALT levels begin to rise, PT/INR increases; 3-5 days post ingestion: acidosis, renal involvement, encephelopathy, fulminant hepatic failure, death
Term
Acetaminophen Nomogram
Definition
ONLY used for single, ACUTE ingestions; used if: unknown amount ingested, known ingestion of >10 grams or 200 mg/kg, all adult intentional ingestions
Term
Start Antidotal Therapy for Chronic Ingestion or Unknown Time of Ingestion
Definition
in this situation, you can't use nomogram; draw LFTs & APAP level; if LFTs are elevated OR APAP level is detectable, start antidotal therapy
Term
NAC (N-acetylcysteine) [Mucomyst]
Definition
treatment of acute and chronic APAP toxicity; most effective when given within 8-10 hrs post-ingestion; MoA: acts as sulfhydryl group donor, detoxifies NAPQI
Term
Other Treatment for APAP Toxicity
Definition
antiemetics, FFP/vitamin K, liver transplant (if liver failure is occurring)
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