Cocaine concentrations in the blood during rhinoplasty.

After applying 5% or 10% cocaine to the nasal mucosa, blood concentration were measured in 9 patients undergoing rhinoplasty and in 6 unoperated controls. The concentrations in the unoperated persons were lower than in those undergoing rhinoplasty, and lower concentrations were found after 5% solutions in both groups than in those exposed to 10% solutions. There was no correlation between the strength of the solution used and the degree of bleeding or the success of the anesthesia. One patient developed symptoms of toxicity within two minutes of a 5% cocaine application to his nasal mucosa. The cocaine concentrations in his blood were the highest seen in our studies, and we cannot explain this.