Endotracheal epinephrine is unreliable.

Area of Science:

• Emergency Medicine
• Pharmacology
• Critical Care

Background:

• Intravenous access is crucial in emergencies but can be challenging.
• The endotracheal route is a potential alternative for emergency drug administration when IV access is unavailable.
• Optimal endotracheal drug dosages and diluents remain undetermined.

Purpose of the Study:

• To compare the efficacy of epinephrine administration via central intravenous, peripheral intravenous, intraosseous, and intratracheal routes.
• To evaluate the impact of different dilutions and doses for endotracheal epinephrine administration.
• To assess epinephrine's effectiveness in both normotensive and hemorrhagic shock models.

Main Methods:

• Epinephrine (1:10,000) was administered via central IV, peripheral IV, and intraosseous routes with saline flush in dogs.
• Intratracheal epinephrine was given at 0.01 and 0.02 mg/kg, diluted with saline or sterile water.
• Arterial blood pressure was monitored to assess the response to epinephrine in normotensive and shock states.

Main Results:

• Intraosseous, central IV, and peripheral IV routes demonstrated comparable efficacy in epinephrine delivery.
• These routes showed similar onset, peak effect, and magnitude of blood pressure response in both normal and shock conditions.
• The intraosseous route resulted in a significantly longer duration of action (P < 0.02).
• The intratracheal route proved unreliable and irreproducible, with no discernible blood pressure response in a significant number of trials.

Conclusions:

• Intraosseous and intravenous routes are reliable and effective for emergency epinephrine administration.
• The intratracheal route is not a recommended method for emergency drug delivery due to its unreliability.
• Further research is needed to establish optimal endotracheal drug administration protocols, if viable.