- Published on
Emergency and Acute Medicine -Cocaine Poisoning
Description And Pharmacology
Cocaine poisoning results from exposure to a potent sympathomimetic agent that inhibits neurotransmitter reuptake at presynaptic nerve terminals. This leads to excessive stimulation of adrenergic, dopaminergic, and serotonergic pathways. Cocaine is metabolized through hepatic degradation, nonenzymatic hydrolysis, and cholinesterase-mediated pathways, producing both active and inactive metabolites.
Etiology And Routes Of Exposure
Cocaine may be administered intravenously, intranasally, or orally. Oral ingestion is particularly important in the context of illicit drug transport. Body stuffers ingest hastily wrapped packets, often poorly sealed, in an attempt to evade law enforcement. Body packers deliberately ingest or insert carefully wrapped packets containing large quantities of cocaine into oral, rectal, or vaginal cavities for smuggling purposes, placing them at high risk for massive toxicity if a packet ruptures.
Clinical Features And Symptomatology
Patients typically present with a classic sympathomimetic toxidrome. Cardiovascular manifestations include hypertension, tachycardia, and chest pain consistent with angina or myocardial ischemia. Respiratory findings may include tachypnea, pleuritic chest pain, pneumomediastinum, pneumothorax, bronchitis, pulmonary infarction, or cough. Neurologic effects range from agitation and tremulousness to seizures, coma, and stroke. Additional findings may include hyperthermia, which is a poor prognostic sign, limb ischemia from inadvertent intra-arterial injection, corneal ulcerations in heavy crack smokers, and rhabdomyolysis.
History And Physical Examination
A focused history is critical, particularly in suspected body packers or stuffers, and should include time since ingestion, route of exposure, number of packets, and packing material. On examination, patients often demonstrate hypertension, tachycardia, tachypnea, hyperthermia, diaphoresis, mydriasis, and neuromuscular hyperactivity consistent with sympathomimetic toxicity.
Initial Clinical Assessment And Toxidrome Recognition
Recognition of the sympathomimetic toxidrome is essential and should be distinguished from anticholinergic toxicity. Sympathomimetic poisoning is characterized by tachycardia, elevated blood pressure, moist skin, increased bowel sounds, elevated temperature, and absence of urinary retention, whereas anticholinergic toxicity presents with dry skin, decreased bowel sounds, and urinary retention.
Diagnostic Evaluation And Testing
Laboratory evaluation includes complete blood count, electrolytes, renal function, glucose, urinalysis for myoglobin, creatine phosphokinase, and cardiac enzymes in patients with chest pain or ECG abnormalities. Imaging studies include ECG for ischemia or dysrhythmias, chest radiography for chest pain or dyspnea to evaluate for pneumothorax or pneumomediastinum, and abdominal radiography for suspected body packers. Computed tomography of the abdomen with contrast may be required if suspicion remains high despite negative radiographs. CT brain imaging is indicated for altered mental status or severe headache to evaluate for ischemic or hemorrhagic stroke.
Differential Diagnosis
The differential diagnosis includes other causes of sympathomimetic toxicity such as amphetamines, caffeine, theophylline, albuterol, tricyclic antidepressants, antihistamines, phencyclidine, hallucinogens, thyrotoxicosis, and neuroleptic malignant syndrome.
Prehospital And Initial Stabilization
Early management includes establishment of intravenous access, cardiac monitoring, and administration of benzodiazepines to control agitation and autonomic excess. In cases of combined opioid and cocaine use, naloxone should be administered incrementally to reverse opioid-induced coma. Initial stabilization in the emergency department follows standard airway, breathing, and circulation principles, with consideration of dextrose, thiamine, and naloxone for altered mental status.
Emergency Department Management
Supportive care is the cornerstone of treatment. Benzodiazepines are first-line therapy for agitation, seizures, hypertension, and tachycardia. Active cooling using evaporative and convective methods is essential for hyperthermia. Rhabdomyolysis is treated with aggressive intravenous hydration and urine alkalinization in severe cases. Cocaine-associated chest pain is managed with aspirin, nitrates, oxygen, and opiates, while avoiding beta-blockers due to the risk of unopposed alpha-adrenergic stimulation. Severe hypertension may require vasodilators such as nitroglycerin or nitroprusside, or alpha-blockade with phentolamine.
Management Of Body Packers And Stuffers
Asymptomatic or minimally symptomatic body stuffers may receive a single dose of activated charcoal. Whole-bowel irrigation with polyethylene glycol may be considered, though efficacy is uncertain. Symptomatic body packers and stuffers require surgical consultation, and operative removal of packets is indicated when toxicity cannot be controlled with medical therapy.
Disposition And Follow-Up
Admission is indicated for patients with altered mental status, abnormal vital signs, hyperthermia, cocaine-induced myocardial ischemia, or confirmed body packing. Moderate to severe toxicity warrants ICU admission. Patients may be discharged after adequate observation if mental status and vital signs normalize and no complications are identified, with longer observation required for body stuffers until packet passage is confirmed.
Clinical Pearls And Pitfalls
Benzodiazepines are the primary treatment for cocaine-induced sympathomimetic toxicity. Beta-blockers should generally be avoided due to the risk of worsening hypertension. Cocaine-associated chest pain requires a broad differential, including myocardial infarction. Abdominal radiographs are useful for body packers but unreliable for body stuffers.
Description And Pharmacology
Cocaine poisoning results from exposure to a potent sympathomimetic agent that inhibits neurotransmitter reuptake at presynaptic nerve terminals. This leads to excessive stimulation of adrenergic, dopaminergic, and serotonergic pathways. Cocaine is metabolized through hepatic degradation, nonenzymatic hydrolysis, and cholinesterase-mediated pathways, producing both active and inactive metabolites.
Etiology And Routes Of Exposure
Cocaine may be administered intravenously, intranasally, or orally. Oral ingestion is particularly important in the context of illicit drug transport. Body stuffers ingest hastily wrapped packets, often poorly sealed, in an attempt to evade law enforcement. Body packers deliberately ingest or insert carefully wrapped packets containing large quantities of cocaine into oral, rectal, or vaginal cavities for smuggling purposes, placing them at high risk for massive toxicity if a packet ruptures.
Clinical Features And Symptomatology
Patients typically present with a classic sympathomimetic toxidrome. Cardiovascular manifestations include hypertension, tachycardia, and chest pain consistent with angina or myocardial ischemia. Respiratory findings may include tachypnea, pleuritic chest pain, pneumomediastinum, pneumothorax, bronchitis, pulmonary infarction, or cough. Neurologic effects range from agitation and tremulousness to seizures, coma, and stroke. Additional findings may include hyperthermia, which is a poor prognostic sign, limb ischemia from inadvertent intra-arterial injection, corneal ulcerations in heavy crack smokers, and rhabdomyolysis.
History And Physical Examination
A focused history is critical, particularly in suspected body packers or stuffers, and should include time since ingestion, route of exposure, number of packets, and packing material. On examination, patients often demonstrate hypertension, tachycardia, tachypnea, hyperthermia, diaphoresis, mydriasis, and neuromuscular hyperactivity consistent with sympathomimetic toxicity.
Initial Clinical Assessment And Toxidrome Recognition
Recognition of the sympathomimetic toxidrome is essential and should be distinguished from anticholinergic toxicity. Sympathomimetic poisoning is characterized by tachycardia, elevated blood pressure, moist skin, increased bowel sounds, elevated temperature, and absence of urinary retention, whereas anticholinergic toxicity presents with dry skin, decreased bowel sounds, and urinary retention.
Diagnostic Evaluation And Testing
Laboratory evaluation includes complete blood count, electrolytes, renal function, glucose, urinalysis for myoglobin, creatine phosphokinase, and cardiac enzymes in patients with chest pain or ECG abnormalities. Imaging studies include ECG for ischemia or dysrhythmias, chest radiography for chest pain or dyspnea to evaluate for pneumothorax or pneumomediastinum, and abdominal radiography for suspected body packers. Computed tomography of the abdomen with contrast may be required if suspicion remains high despite negative radiographs. CT brain imaging is indicated for altered mental status or severe headache to evaluate for ischemic or hemorrhagic stroke.
Differential Diagnosis
The differential diagnosis includes other causes of sympathomimetic toxicity such as amphetamines, caffeine, theophylline, albuterol, tricyclic antidepressants, antihistamines, phencyclidine, hallucinogens, thyrotoxicosis, and neuroleptic malignant syndrome.
Prehospital And Initial Stabilization
Early management includes establishment of intravenous access, cardiac monitoring, and administration of benzodiazepines to control agitation and autonomic excess. In cases of combined opioid and cocaine use, naloxone should be administered incrementally to reverse opioid-induced coma. Initial stabilization in the emergency department follows standard airway, breathing, and circulation principles, with consideration of dextrose, thiamine, and naloxone for altered mental status.
Emergency Department Management
Supportive care is the cornerstone of treatment. Benzodiazepines are first-line therapy for agitation, seizures, hypertension, and tachycardia. Active cooling using evaporative and convective methods is essential for hyperthermia. Rhabdomyolysis is treated with aggressive intravenous hydration and urine alkalinization in severe cases. Cocaine-associated chest pain is managed with aspirin, nitrates, oxygen, and opiates, while avoiding beta-blockers due to the risk of unopposed alpha-adrenergic stimulation. Severe hypertension may require vasodilators such as nitroglycerin or nitroprusside, or alpha-blockade with phentolamine.
Management Of Body Packers And Stuffers
Asymptomatic or minimally symptomatic body stuffers may receive a single dose of activated charcoal. Whole-bowel irrigation with polyethylene glycol may be considered, though efficacy is uncertain. Symptomatic body packers and stuffers require surgical consultation, and operative removal of packets is indicated when toxicity cannot be controlled with medical therapy.
Disposition And Follow-Up
Admission is indicated for patients with altered mental status, abnormal vital signs, hyperthermia, cocaine-induced myocardial ischemia, or confirmed body packing. Moderate to severe toxicity warrants ICU admission. Patients may be discharged after adequate observation if mental status and vital signs normalize and no complications are identified, with longer observation required for body stuffers until packet passage is confirmed.
Clinical Pearls And Pitfalls
Benzodiazepines are the primary treatment for cocaine-induced sympathomimetic toxicity. Beta-blockers should generally be avoided due to the risk of worsening hypertension. Cocaine-associated chest pain requires a broad differential, including myocardial infarction. Abdominal radiographs are useful for body packers but unreliable for body stuffers.
0 Comments
