Comparison of intraosseous, intramuscular, and intravenous administration of succinylcholine.

The intraosseous route of vascular access has been popularized recently for resuscitation of children. Intraosseous succinylcholine use has been anecdotally reported for airway management. This drug could be utilized for control of the airway in pediatric burns, status epilepticus, or combative head-injured patients. No series quantifying the efficacy of the intraosseous route has been reported for succinylcholine. To accomplish this goal, six sheep serving as their own controls were anesthetized with halothane and subsequently intubated. Succinylcholine (1 mg/kg) was given. The time to respiratory arrest and 100% loss of the forefoot twitch upon stimulation of the anterior tibial nerve were noted. Each animal was successively studied using the intravenous (IV), intraosseous (IO), and intramuscular (IM) routes of administration, with a minimum of seven days separating trials. The average time from administration to respiratory arrest in seconds was 30.8 +/- 7.3 (IV), 57.5 +/- 10.3 (IO), and 230 +/- 106 (IM). The average time from administration to 100% loss of forefoot twitch in seconds was 93.3 +/- 34.0 (IV), 100.8 +/- 24.2 (IO), and 291 +/- 109 (IM). All groups were statistically significantly different using the t-test for the difference of means, with a p value less than 0.0015. We conclude that the intraosseous route of administration of succinylcholine in this series of sheep is comparable to the intravenous route and superior to the intramuscular route.