General Management of Poisoned Patients

General Management of Poisoned Patients

General Management of Poisoned Patients PWM OLLY INDRAJANI 2013 Introduction

Poisoning occurs when exposure to a substance adversely affects the function of any system within an organism. The setting of the poison exposure

may be occupational, environmental, recreational, or medicinal. Poisoning may result from varied portals of

entry, including - inhalation, - insufflation, - ingestion, - cutaneous - mucous membrane exposure, and

- injection. Historically most poisonings have occurred when substances are tasted or swallowed Toxins may be airborne in the form of gas or vapors or in a suspension such as dust.

Caustics, vesicants, or irritants may directly affect the skin, or a toxin may pass transdermally and affect internal structures (e.g., methylene chloride, aniline dye). Parenteral exposure results from IV or SC injection of medications or drugs of abuse

Resuscitation Patients may have an altered mental status because of hypoxia, opioid intoxication, hypoglycemia, and Wernicke Encephalopathy,

conditions readily treated by specific antidotes. Empiric administration of antidotes (the "coma cocktail"), including supplemental oxygen, naloxone, glucose, and thiamine, should be considered after the medical history,

vital signs, and immediately available laboratory data are taken into account The dogma that the administration of thiamine should precede the administration of glucose to prevent the precipitation of acute Wernicke

encephalopathy is unfounded. Naloxone is a competitive opioid antagonist without any intrinsic toxicity that can be administered IV or IM and is appropriate to use in a hypoventilating opioid-intoxicated patient who is not intubated.

Naloxone may be given to children as a therapeutic challenge when unintentional or intentional opioid exposure cannot be excluded. Using miosis as the sole indication for naloxone administration is unreliable, because

many other toxins can produce small pupils along with mental status depression, and some opioids classically leave pupil size unaltered (e.g., meperidine, propoxyphene). Naloxone often completely reverses the effects of the opioid and restores effective ventilations

and mental status for 20 to 60 minutes, so patients should be observed for 2 to 3 hours after IV administration The risks of naloxone treatment are few but include the precipitation of an acute opioid

withdrawal syndrome. Although acute withdrawal is never lifethreatening in adults, vomiting from withdrawal can result in aspiration. Thus, the reflexive administration of large doses of naloxone should be discouraged

ED Diagnosis History Toxicologic Physical Examination Undress the patient completely. Check the patient's clothing for objects still retained in the pockets or substances hidden on

the patient's body (waistband, groin, or between skinfolds) Assess the general appearance of the patient and note any agitation, confusion, or obtundation. Examine the skin for cyanosis or flushing,

excessive diaphoresis or dryness, signs of injury or injection, ulcers, or bullae. Bruising may be a clue to trauma, a prolonged duration of unconsciousness, or coagulopathy. Toxicologic Physical Examination

Examine the eyes for pupil size, reactivity, nystagmus, dysconjugate gaze, or excessive lacrimation. Examine the oropharynx for hypersalivation or excessive dryness. Auscultate the lung fields to assess for bronchorrhea or wheezing, and the

heart for its rhythm, rate, and regularity. Examine the abdomen, noting the presence of bowel sounds, enlarged bladder, and abdominal tenderness or rigidity. Evaluate the extremities for muscle tone and note any tremor or fasciculation

Toxicologic Screen General Decontamination The general approach to most toxic exposures the removal of the patient from

the substance and the substance from the patient. Toxins on the outside of the body washed away. Toxins within the body, either bound within the gut lumen to make it unavailable for

absorption or elimination from the gut, blood, or tissues can be enhanced. Gross Decontamination Surface decontamination is achieved by completely undressing patients and thoroughly

washing them with copious amounts of water. Patients requiring assistance should be attended to by properly gowned staff. The towels used to dry patients and patients' clothing, shoes, socks, watches, and jewelry should be handled as contaminated material.

If possible, surface decontamination should occur prior to the patient's entry into the ED or other areas in the hospital. In mass casualty exposures, this typically occurs at a staging area adjacent to the ED

GI Decontamination The three general methods of decontamination: 1. Removing the toxin from the stomach via the mouth 2. Binding it inside the gut lumen

3. Enhancing transit through the intestines GI decontamination should never be initiated as a punitive action. Toxin Adsorption in the Gut Activated Charcoal

Enhancement of Bowel Transit Cathartics Whole-Bowel Irrigation Whole-bowel irrigation is best accomplished by

infusing the polyethylene glycol solution through a nasogastric tube, although in motivated patients, oral ingestion can be used. Typical doses are 1.5 to 2.0 L/h in adults, 1 L/h in children 6 to 12 years of age, and 0.5 L/h in children <6 years of age. Contraindications include preceding diarrhea, ingestion

of substances that are expected to result in significant diarrhea (except for heavy metals, because these substances do not adsorb well to activated charcoal), and bowel obstruction as evidenced by lack of bowel sounds. Complications include bloating, cramping, and rectal

irritation from frequent bowel movements. Urinary Acidification Acidification of urine can somewhat enhance elimination of weak bases, such as amphetamines, phencyclidine, and some

other drugs. However, the risks, particularly in relation to rhabdomyolysis, far outweigh any benefits Forced diuresis has never been shown to be effective for ingestion of any toxin, with the possible exception of chlorophenoxy

herbicides when diuresis is combined with urinary alkalinization

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