6.5.1) PREVENTION OF ABSORPTION/PREHOSPITAL
A) SUMMARY 1) Patient may develop severe vomiting following ingestion. Consider activated charcoal if vomiting is absent, the patient is alert, and the airway is supported.
B) ACTIVATED CHARCOAL 1) PREHOSPITAL ACTIVATED CHARCOAL ADMINISTRATION a) Consider prehospital administration of activated charcoal as an aqueous slurry in patients with a potentially toxic ingestion who are awake and able to protect their airway. Activated charcoal is most effective when administered within one hour of ingestion. Administration in the prehospital setting has the potential to significantly decrease the time from toxin ingestion to activated charcoal administration, although it has not been shown to affect outcome (Alaspaa et al, 2005; Thakore & Murphy, 2002; Spiller & Rogers, 2002). 1) In patients who are at risk for the abrupt onset of seizures or mental status depression, activated charcoal should not be administered in the prehospital setting, due to the risk of aspiration in the event of spontaneous emesis. 2) The addition of flavoring agents (cola drinks, chocolate milk, cherry syrup) to activated charcoal improves the palatability for children and may facilitate successful administration (Guenther Skokan et al, 2001; Dagnone et al, 2002).
2) CHARCOAL DOSE a) Use a minimum of 240 milliliters of water per 30 grams charcoal (FDA, 1985). Optimum dose not established; usual dose is 25 to 100 grams in adults and adolescents; 25 to 50 grams in children aged 1 to 12 years (or 0.5 to 1 gram/kilogram body weight) ; and 0.5 to 1 gram/kilogram in infants up to 1 year old (Chyka et al, 2005). 1) Routine use of a cathartic with activated charcoal is NOT recommended as there is no evidence that cathartics reduce drug absorption and cathartics are known to cause adverse effects such as nausea, vomiting, abdominal cramps, electrolyte imbalances and occasionally hypotension (None Listed, 2004).
b) ADVERSE EFFECTS/CONTRAINDICATIONS 1) Complications: emesis, aspiration (Chyka et al, 2005). Aspiration may be complicated by acute respiratory failure, ARDS, bronchiolitis obliterans or chronic lung disease (Golej et al, 2001; Graff et al, 2002; Pollack et al, 1981; Harris & Filandrinos, 1993; Elliot et al, 1989; Rau et al, 1988; Golej et al, 2001; Graff et al, 2002). Refer to the ACTIVATED CHARCOAL/TREATMENT management for further information. 2) Contraindications: unprotected airway (increases risk/severity of aspiration) , nonfunctioning gastrointestinal tract, uncontrolled vomiting, and ingestion of most hydrocarbons (Chyka et al, 2005).
C) DERMAL EXPOSURE 1) DECONTAMINATION: Remove contaminated clothing and jewelry and place them in plastic bags. Wash exposed areas with soap and water for 10 to 15 minutes with gentle sponging to avoid skin breakdown. A physician may need to examine the area if irritation or pain persists (Burgess et al, 1999).
D) EYE EXPOSURE 1) DECONTAMINATION: Remove contact lenses and irrigate exposed eyes with copious amounts of room temperature 0.9% saline or water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist after 15 minutes of irrigation, the patient should be seen in a healthcare facility.
6.5.2) PREVENTION OF ABSORPTION
A) SUMMARY 1) Administer activated charcoal and consider multidose activated charcoal due to enterohepatic recirculation. 2) Gastric lavage may be useful if performed within 1 to 2 hours of ingestion and if vomiting is controlled.
B) ACTIVATED CHARCOAL 1) CHARCOAL ADMINISTRATION a) Consider administration of activated charcoal after a potentially toxic ingestion (Chyka et al, 2005). Administer charcoal as an aqueous slurry; most effective when administered within one hour of ingestion.
2) CHARCOAL DOSE a) Use a minimum of 240 milliliters of water per 30 grams charcoal (FDA, 1985). Optimum dose not established; usual dose is 25 to 100 grams in adults and adolescents; 25 to 50 grams in children aged 1 to 12 years (or 0.5 to 1 gram/kilogram body weight) ; and 0.5 to 1 gram/kilogram in infants up to 1 year old (Chyka et al, 2005). 1) Routine use of a cathartic with activated charcoal is NOT recommended as there is no evidence that cathartics reduce drug absorption and cathartics are known to cause adverse effects such as nausea, vomiting, abdominal cramps, electrolyte imbalances and occasionally hypotension (None Listed, 2004).
b) ADVERSE EFFECTS/CONTRAINDICATIONS 1) Complications: emesis, aspiration (Chyka et al, 2005). Aspiration may be complicated by acute respiratory failure, ARDS, bronchiolitis obliterans or chronic lung disease (Golej et al, 2001; Graff et al, 2002; Pollack et al, 1981; Harris & Filandrinos, 1993; Elliot et al, 1989; Rau et al, 1988; Golej et al, 2001; Graff et al, 2002). Refer to the ACTIVATED CHARCOAL/TREATMENT management for further information. 2) Contraindications: unprotected airway (increases risk/severity of aspiration) , nonfunctioning gastrointestinal tract, uncontrolled vomiting, and ingestion of most hydrocarbons (Chyka et al, 2005).
C) GASTRIC LAVAGE 1) INDICATIONS: Consider gastric lavage with a large-bore orogastric tube (ADULT: 36 to 40 French or 30 English gauge tube {external diameter 12 to 13.3 mm}; CHILD: 24 to 28 French {diameter 7.8 to 9.3 mm}) after a potentially life threatening ingestion if it can be performed soon after ingestion (generally within 60 minutes). a) Consider lavage more than 60 minutes after ingestion of sustained-release formulations and substances known to form bezoars or concretions.
2) PRECAUTIONS: a) SEIZURE CONTROL: Is mandatory prior to gastric lavage. b) AIRWAY PROTECTION: Place patients in the head down left lateral decubitus position, with suction available. Patients with depressed mental status should be intubated with a cuffed endotracheal tube prior to lavage.
3) LAVAGE FLUID: a) Use small aliquots of liquid. Lavage with 200 to 300 milliliters warm tap water (preferably 38 degrees Celsius) or saline per wash (in older children or adults) and 10 milliliters/kilogram body weight of normal saline in young children(Vale et al, 2004) and repeat until lavage return is clear. b) The volume of lavage return should approximate amount of fluid given to avoid fluid-electrolyte imbalance. c) CAUTION: Water should be avoided in young children because of the risk of electrolyte imbalance and water intoxication. Warm fluids avoid the risk of hypothermia in very young children and the elderly.
4) COMPLICATIONS: a) Complications of gastric lavage have included: aspiration pneumonia, hypoxia, hypercapnia, mechanical injury to the throat, esophagus, or stomach, fluid and electrolyte imbalance (Vale, 1997). Combative patients may be at greater risk for complications (Caravati et al, 2001). b) Gastric lavage can cause significant morbidity; it should NOT be performed routinely in all poisoned patients (Vale, 1997).
5) CONTRAINDICATIONS: a) Loss of airway protective reflexes or decreased level of consciousness if patient is not intubated, following ingestion of corrosive substances, hydrocarbons (high aspiration potential), patients at risk of hemorrhage or gastrointestinal perforation, or trivial or non-toxic ingestion.
D) MULTIPLE-DOSE ACTIVATED CHARCOAL 1) Colchicine is believed to undergo enterohepatic recirculation (Thomas et al, 1989; Ferron et al, 1996). Multiple dose activated charcoal may interrupt enterohepatic recirculation, however, there is no clinical evidence that this decreases toxicity or improves outcome. Multiple dose activated charcoal should be considered in patients with potentially serious or lethal ingestions. 2) MULTIPLE DOSE ACTIVATED CHARCOAL a) ADULT DOSE: Optimal dose not established. After an initial dose of 50 to 100 grams of activated charcoal, subsequent doses may be administered every 1, 2 or 4 hours at a dose equivalent to 12.5 grams/hour (Vale et al, 1999), do not exceed: 0.5 g/kg charcoal every 2 hours (Ghannoum & Gosselin, 2013; Mauro et al, 1994). There is some evidence that smaller more frequent doses are more effective at enhancing drug elimination than larger less frequent doses (Park et al, 1983; Ilkhanipour et al, 1992). PEDIATRIC DOSE: Optimal dose not established. After an initial dose of 25 to 50 grams in children aged 1 to 12 years (or 0.5 to 1 gram/kilogram body weight) (Chyka & Seger, 1997), subsequent doses may be administered every 1, 2 or 4 hours (Vale et al, 1999) in a dose equivalent to 6.25 grams/hour in children 1 to 12 years old. b) Activated charcoal should be continued until the patient's clinical and laboratory parameters, including drug concentrations if available, are improving (Vale et al, 1999). The patient should be frequently assessed for the ability to protect the airway and evidence of decreased peristalsis or intestinal obstruction. c) Use of cathartics has not been shown to increase drug elimination and may increase the likelihood of vomiting. Routine coadministration of a cathartic is NOT recommended (Vale et al, 1999). d) AGENTS AMENABLE TO MDAC THERAPY: The following properties of a drug that are likely to allow MDAC therapy to be effective include: small volume of distribution, low protein binding, prolonged half-life, low intrinsic clearance, and a nonionized state at physiologic pH (Chyka, 1995; Ghannoum & Gosselin, 2013). e) Vomiting is a common adverse effect; antiemetics may be necessary. f) CONTRAINDICATIONS: Absolute contraindications include an unprotected airway, intestinal obstruction, a gastrointestinal tract that is not intact and agents that may increase the risk of aspiration (eg, hydrocarbons). Relative contraindications include decreased peristalsis (eg, decreased bowel sounds, abdominal distention, ileus, severe constipation) (Vale et al, 1999; Mauro et al, 1994). g) COMPLICATIONS: Include constipation, intestinal bleeding, bowel obstruction, appendicitis, charcoal bezoars, and aspiration which may be complicated by acute respiratory failure, adult respiratory distress syndrome or bronchiolitis obliterans (Ghannoum & Gosselin, 2013; Ray et al, 1988; Atkinson et al, 1992; Gomez et al, 1994; Mizutani et al, 1991; Pollack et al, 1981; Harris & Filandrinos, 1993; Elliot et al, 1989; Mina et al, 2002; Harsch, 1986; Rau et al, 1988; Golej et al, 2001; Graff et al, 2002).
6.5.3) TREATMENT
A) SUPPORT 1) MANAGEMENT OF MILD TO MODERATE TOXICITY: Treatment is symptomatic and supportive. Signs of toxicity follow a predictable course, requiring early recognition and aggressive supportive care. Patients may initially be asymptomatic; symptoms may be delayed for several hours after exposure. Carefully monitor airway, circulation and CNS function. Analgesics or opiates with or without an anticholinergic agent may be used to control severe abdominal pain, watch for possible toxic ileus. For mild to moderate overdose, consider GI decontamination and treat for shock. Monitor vital signs. Hypotension may be observed during the early phase of toxicity. Administer IV fluids, antiemetics, and vasopressors as needed. Treat seizures initially with benzodiazepines, add propofol or barbiturates if seizures persist. 2) MANAGEMENT OF SEVERE TOXICITY: Treatment is supportive in the ICU. Multiorgan system failure may occur 1 to 7 days post ingestion. Treat with IV fluids, vasopressors, cardiac monitoring, intubation, antibiotics for sepsis, G-CSF for pancytopenia, dialysis for acute renal failure as needed.
B) MONITORING OF PATIENT 1) There have been reports of measuring colchicine plasma, serum and urine concentrations. However, these laboratory studies are unlikely to have a turnaround time to be clinically useful. Laboratory and other study evaluations should be based on the patient's signs and symptoms. Monitor vital signs and fluid status. Obtain serum electrolytes, CBC, and renal and liver functions tests as indicated. Fluid and electrolyte status should be followed closely and be replaced as is necessary.
C) AIRWAY MANAGEMENT 1) Airway management and support may be needed. Central nervous symptoms and ascending paralysis with respiratory involvement require aggressive supportive care including mechanical ventilation.
D) MYELOSUPPRESSION 1) Obtain a CBC with differential daily to monitor for bone marrow depression; continue until signs of improvement. Consider filgrastim for severe neutropenia. Patients suffering from bone marrow depression should be isolated to protect the patient from infection. 2) CASE REPORT: Granulocyte colony stimulating factor (G-CSF) was given to 2 patients who developed leukopenia after unintentional ingestion of Colchicum autumnale (autumn crocus). One of the two patients received G-CSF 300 mcg daily for 3 days. Both patients recovered with subsequent normalization of their leukocyte counts (Brvar et al, 2004; Gabrscek et al, 2004). 3) There is little data on the use of hematopoietic colony stimulating factors to treat neutropenia after drug overdose or idiosyncratic reactions. These agents have been shown to shorten the duration of severe neutropenia in patients receiving cancer chemotherapy (Hartman et al, 1997; Stull et al, 2005). They have also been used to treat agranulocytosis induced by nonchemotherapy drugs (Beauchesne & Shalansky, 1999). They may be considered in patients with severe neutropenia who have or are at significant risk for developing febrile neutropenia. a) Filgrastim: The usual starting dose in adults is 5 micrograms/kilogram/day by intravenous infusion or subcutaneous injection (Prod Info NEUPOGEN(R) injection, 2006). b) Sargramostim: Usual dose is 250 micrograms/square meter/day infused IV over 4 hours (Prod Info LEUKINE(R) injection, 2006). c) Monitor CBC with differential.
E) ACUTE LUNG INJURY 1) Respiratory distress can progress to acute respiratory distress syndrome. These symptoms usually develop in the second phase of illness (day 1 to 7 post ingestion) (Amrollahi-Sharifabadi et al, 2013). 2) ONSET: Onset of acute lung injury after toxic exposure may be delayed up to 24 to 72 hours after exposure in some cases. 3) NON-PHARMACOLOGIC TREATMENT: The treatment of acute lung injury is primarily supportive (Cataletto, 2012). Maintain adequate ventilation and oxygenation with frequent monitoring of arterial blood gases and/or pulse oximetry. If a high FIO2 is required to maintain adequate oxygenation, mechanical ventilation and positive-end-expiratory pressure (PEEP) may be required; ventilation with small tidal volumes (6 mL/kg) is preferred if ARDS develops (Haas, 2011; Stolbach & Hoffman, 2011). a) To minimize barotrauma and other complications, use the lowest amount of PEEP possible while maintaining adequate oxygenation. Use of smaller tidal volumes (6 mL/kg) and lower plateau pressures (30 cm water or less) has been associated with decreased mortality and more rapid weaning from mechanical ventilation in patients with ARDS (Brower et al, 2000). More treatment information may be obtained from ARDS Clinical Network website, NIH NHLBI ARDS Clinical Network Mechanical Ventilation Protocol Summary, http://www.ardsnet.org/node/77791 (NHLBI ARDS Network, 2008)
4) FLUIDS: Crystalloid solutions must be administered judiciously. Pulmonary artery monitoring may help. In general the pulmonary artery wedge pressure should be kept relatively low while still maintaining adequate cardiac output, blood pressure and urine output (Stolbach & Hoffman, 2011). 5) ANTIBIOTICS: Indicated only when there is evidence of infection (Artigas et al, 1998). 6) EXPERIMENTAL THERAPY: Partial liquid ventilation has shown promise in preliminary studies (Kollef & Schuster, 1995). 7) CALFACTANT: In a multicenter, randomized, blinded trial, endotracheal instillation of 2 doses of 80 mL/m(2) calfactant (35 mg/mL of phospholipid suspension in saline) in infants, children, and adolescents with acute lung injury resulted in acute improvement in oxygenation and lower mortality; however, no significant decrease in the course of respiratory failure measured by duration of ventilator therapy, intensive care unit, or hospital stay was noted. Adverse effects (transient hypoxia and hypotension) were more frequent in calfactant patients, but these effects were mild and did not require withdrawal from the study (Wilson et al, 2005). 8) However, in a multicenter, randomized, controlled, and masked trial, endotracheal instillation of up to 3 doses of calfactant (30 mg) in adults only with acute lung injury/ARDS due to direct lung injury was not associated with improved oxygenation and longer term benefits compared to the placebo group. It was also associated with significant increases in hypoxia and hypotension (Willson et al, 2015). F) BLOOD COAGULATION DISORDER 1) If severe coagulopathy with bleeding develops, transfuse with RBCs, platelets, and fresh frozen plasma as indicated.
G) HYPOTENSIVE EPISODE 1) SUMMARY a) Infuse 10 to 20 milliliters/kilogram of isotonic fluid and keep the patient supine. If hypotension persists, administer dopamine or norepinephrine. Consider central venous pressure monitoring to guide further fluid therapy.
2) DOPAMINE a) DOSE: Begin at 5 micrograms per kilogram per minute progressing in 5 micrograms per kilogram per minute increments as needed (Prod Info dopamine hcl, 5% dextrose IV injection, 2004). If hypotension persists, dopamine may need to be discontinued and a more potent vasoconstrictor (eg, norepinephrine) should be considered (Prod Info dopamine hcl, 5% dextrose IV injection, 2004). b) CAUTION: If ventricular dysrhythmias occur, decrease rate of administration (Prod Info dopamine hcl, 5% dextrose IV injection, 2004). Extravasation may cause local tissue necrosis, administration through a central venous catheter is preferred (Prod Info dopamine hcl, 5% dextrose IV injection, 2004).
3) NOREPINEPHRINE a) PREPARATION: 4 milligrams (1 amp) added to 1000 milliliters of diluent provides a concentration of 4 micrograms/milliliter of norepinephrine base. Norepinephrine bitartrate should be mixed in dextrose solutions (dextrose 5% in water, dextrose 5% in saline) since dextrose-containing solutions protect against excessive oxidation and subsequent potency loss. Administration in saline alone is not recommended (Prod Info norepinephrine bitartrate injection, 2005). b) DOSE 1) ADULT: Dose range: 0.1 to 0.5 microgram/kilogram/minute (eg, 70 kg adult 7 to 35 mcg/min); titrate to maintain adequate blood pressure (Peberdy et al, 2010). 2) CHILD: Dose range: 0.1 to 2 micrograms/kilogram/minute; titrate to maintain adequate blood pressure (Kleinman et al, 2010). 3) CAUTION: Extravasation may cause local tissue ischemia, administration by central venous catheter is advised (Peberdy et al, 2010).
H) CARDIOGENIC SHOCK 1) EXTRACORPOREAL LIFE SUPPORT a) CASE REPORT: A 68-year-old woman inadvertently ingested C. autumnale mistaking the plant for wild leeks. Several days after exposure, the patient developed severe shock and multi-organ failure and was admitted to an ICU setting. Laboratory studies showed evidence of numerous clinical events including pancytopenia (requiring blood products), acute liver and renal failure, rhabdomyolysis, severe metabolic acidosis, and cardiac failure. A peak colchicine (10 ng/mL; therapeutic range, 0.6 mg/dL) plasma concentration was reached on day 4. Cardiogenic shock was initially treated with dobutamine (10 mcg/kg/min) and close hemodynamic monitoring including Swan-Ganz and echocardiography. A transthoracic echocardiography revealed global hypokinesia with a left ventricular ejection fraction of 5% to 10%, severe right ventricular dysfunction with moderate tricuspid regurgitation. However, despite these efforts hemodynamic instability persisted and the patient was started on extracorporeal life support (ECLS) at a rate of 3.5 L/min and 3800 rev/min. Gradually, her cardiac function improved and ECLS was removed on day 10. Ongoing clinical complications included sudden arrhythmias with third-degree atrioventricular block on day 12 with cardiac arrest that was treated successfully with resuscitation. Persistent renal failure required intermittent hemodialysis until day 23 and mechanical ventilation was needed until day 20. By day 24, the patient had completely recovered from multi-organ failure and was discharged to home with no permanent sequelae (Boisrame-Helms et al, 2015).
I) SEIZURE 1) SUMMARY a) Attempt initial control with a benzodiazepine (eg, diazepam, lorazepam). If seizures persist or recur, administer phenobarbital or propofol. b) Monitor for respiratory depression, hypotension, and dysrhythmias. Endotracheal intubation should be performed in patients with persistent seizures. c) Evaluate for hypoxia, electrolyte disturbances, and hypoglycemia (or, if immediate bedside glucose testing is not available, treat with intravenous dextrose).
2) DIAZEPAM a) ADULT DOSE: Initially 5 to 10 mg IV, OR 0.15 mg/kg IV up to 10 mg per dose up to a rate of 5 mg/minute; may be repeated every 5 to 20 minutes as needed (Brophy et al, 2012; Prod Info diazepam IM, IV injection, 2008; Manno, 2003). b) PEDIATRIC DOSE: 0.1 to 0.5 mg/kg IV over 2 to 5 minutes; up to a maximum of 10 mg/dose. May repeat dose every 5 to 10 minutes as needed (Loddenkemper & Goodkin, 2011; Hegenbarth & American Academy of Pediatrics Committee on Drugs, 2008). c) Monitor for hypotension, respiratory depression, and the need for endotracheal intubation. Consider a second agent if seizures persist or recur after repeated doses of diazepam .
3) NO INTRAVENOUS ACCESS a) DIAZEPAM may be given rectally or intramuscularly (Manno, 2003). RECTAL DOSE: CHILD: Greater than 12 years: 0.2 mg/kg; 6 to 11 years: 0.3 mg/kg; 2 to 5 years: 0.5 mg/kg (Brophy et al, 2012). b) MIDAZOLAM has been used intramuscularly and intranasally, particularly in children when intravenous access has not been established. ADULT DOSE: 0.2 mg/kg IM, up to a maximum dose of 10 mg (Brophy et al, 2012). PEDIATRIC DOSE: INTRAMUSCULAR: 0.2 mg/kg IM, up to a maximum dose of 7 mg (Chamberlain et al, 1997) OR 10 mg IM (weight greater than 40 kg); 5 mg IM (weight 13 to 40 kg); INTRANASAL: 0.2 to 0.5 mg/kg up to a maximum of 10 mg/dose (Loddenkemper & Goodkin, 2011; Brophy et al, 2012). BUCCAL midazolam, 10 mg, has been used in adolescents and older children (5-years-old or more) to control seizures when intravenous access was not established (Scott et al, 1999).
4) LORAZEPAM a) MAXIMUM RATE: The rate of intravenous administration of lorazepam should not exceed 2 mg/min (Brophy et al, 2012; Prod Info lorazepam IM, IV injection, 2008). b) ADULT DOSE: 2 to 4 mg IV initially; repeat every 5 to 10 minutes as needed, if seizures persist (Manno, 2003; Brophy et al, 2012). c) PEDIATRIC DOSE: 0.05 to 0.1 mg/kg IV over 2 to 5 minutes, up to a maximum of 4 mg/dose; may repeat in 5 to 15 minutes as needed, if seizures continue (Brophy et al, 2012; Loddenkemper & Goodkin, 2011; Hegenbarth & American Academy of Pediatrics Committee on Drugs, 2008; Sreenath et al, 2010; Chin et al, 2008).
5) PHENOBARBITAL a) ADULT LOADING DOSE: 20 mg/kg IV at an infusion rate of 50 to 100 mg/minute IV. An additional 5 to 10 mg/kg dose may be given 10 minutes after loading infusion if seizures persist or recur (Brophy et al, 2012). b) Patients receiving high doses will require endotracheal intubation and may require vasopressor support (Brophy et al, 2012). c) PEDIATRIC LOADING DOSE: 20 mg/kg may be given as single or divided application (2 mg/kg/minute in children weighing less than 40 kg up to 100 mg/min in children weighing greater than 40 kg). A plasma concentration of about 20 mg/L will be achieved by this dose (Loddenkemper & Goodkin, 2011). d) REPEAT PEDIATRIC DOSE: Repeat doses of 5 to 20 mg/kg may be given every 15 to 20 minutes if seizures persist, with cardiorespiratory monitoring (Loddenkemper & Goodkin, 2011). e) MONITOR: For hypotension, respiratory depression, and the need for endotracheal intubation (Loddenkemper & Goodkin, 2011; Manno, 2003). f) SERUM CONCENTRATION MONITORING: Monitor serum concentrations over the next 12 to 24 hours. Therapeutic serum concentrations of phenobarbital range from 10 to 40 mcg/mL, although the optimal plasma concentration for some individuals may vary outside this range (Hvidberg & Dam, 1976; Choonara & Rane, 1990; AMA Department of Drugs, 1992).
6) OTHER AGENTS a) If seizures persist after phenobarbital, propofol or pentobarbital infusion, or neuromuscular paralysis with general anesthesia (isoflurane) and continuous EEG monitoring should be considered (Manno, 2003). Other anticonvulsants can be considered (eg, valproate sodium, levetiracetam, lacosamide, topiramate) if seizures persist or recur; however, there is very little data regarding their use in toxin induced seizures, controlled trials are not available to define the optimal dosage ranges for these agents in status epilepticus (Brophy et al, 2012): 1) VALPROATE SODIUM: ADULT DOSE: An initial dose of 20 to 40 mg/kg IV, at a rate of 3 to 6 mg/kg/minute; may give an additional dose of 20 mg/kg 10 minutes after loading infusion. PEDIATRIC DOSE: 1.5 to 3 mg/kg/minute (Brophy et al, 2012). 2) LEVETIRACETAM: ADULT DOSE: 1000 to 3000 mg IV, at a rate of 2 to 5 mg/kg/min IV. PEDIATRIC DOSE: 20 to 60 mg/kg IV (Brophy et al, 2012; Loddenkemper & Goodkin, 2011). 3) LACOSAMIDE: ADULT DOSE: 200 to 400 mg IV; 200 mg IV over 15 minutes (Brophy et al, 2012). PEDIATRIC DOSE: In one study, median starting doses of 1.3 mg/kg/day and maintenance doses of 4.7 mg/kg/day were used in children 8 years and older (Loddenkemper & Goodkin, 2011). 4) TOPIRAMATE: ADULT DOSE: 200 to 400 mg nasogastric/orally OR 300 to 1600 mg/day orally divided in 2 to 4 times daily (Brophy et al, 2012).
J) MEASURE OF URINE OUTPUT 1) Renal excretion of colchicine is greatest when blood levels are highest; therefore, adequate urine output must be maintained early on in the intoxicated patient (Garden & Judson, 1990).
K) EXPERIMENTAL THERAPY 1) MICE: FAB fragments have been tested on mice. a) When half a molar dose of Fab fragments compared to the colchicine dose was given intravenously and intraperitoneally, 80 percent of the mice survived, and at one-eighth molar, 20 percent survived (Urtizberea et al, 1990; Scherrmann et al, 1990). b) This treatment has NOT been tried on humans.
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