Can J Emerg Med
-
To determine if peripheral venous blood gas values for pH, partial pressure of carbon dioxide (Pco(2)) and the resultant calculated bicarbonate (HCO(3)) predict arterial values accurately enough to replace them in a clinical setting. ⋯ Arterial and venous blood gas samples were strongly correlated, and there were only small differences between them. A survey of emergency physicians suggested that the differences are too large to allow for interchangeability of results; however, venous values may be valid if used in conjunction with a correction factor or for trending purposes.
-
Most emergency departments (EDs) have deficiencies in the type and quantity of antidotes readily available to treat severely poisoned patients. Undue emphasis on the purchase price of several expensive antidotes such as anti-digoxin F(ab) fragments and fomepizole may contribute to this problem by creating the perception that comprehensive antidote stocking is too costly for smaller centres. For rarely used medications, however, purchase price alone is an insufficient estimate of cost. ⋯ While other factors (antidote efficacy, safety and available alternate therapy) need to be considered, the cost of maintaining antidote availability is not determined primarily by purchase price. A change in supplier policy to free replacement on expiry for fomepizole and cyanide antidotes would have a considerable effect on making these antidotes less costly for smaller Canadian EDs.
-
Lateral canthotomy and cantholysis is a simple procedure that can be performed by emergency physicians. It has the potential to save vision, particularly in cases of blunt ocular trauma. The case of a 37-year-old man with blunt ocular trauma, a retrobulbar hemorrhage and rapidly increasing orbital pressure requiring an urgent lateral canthotomy and cantholysis is presented. Pathophysiology, indications, contraindications, procedure and follow-up care are described.
-
Poisoning is an uncommon but potentially fatal outcome of toxic alcohol ingestion. The toxic alcohols methanol, ethylene glycol and isopropyl alcohol are commonly found in household and commercial products. Because the toxic effects are caused by the metabolites of methanol and ethylene glycol rather than the agents themselves, there is often a substantial delay between ingestion and onset of clinical toxicity. ⋯ The pitfalls of using these tests to rule out alcohol ingestion are reviewed. Ethanol infusion is the traditional therapy for such overdoses. In addition to the pathophysiology and clinical findings in poisoning, recent evidence for the use of fomepizole and adjuvant therapies is reviewed.