ABSTRACT
The intra-osseous [IO] route serves as an appropriate venous access site if access is needed in an emergency. In this study, we compared the appearance time of methylene blue [MB] in the aorta following IO and peripheral intravenous [IV] routes in a rabbit model to assess a novel idea and compare the speed of IV and IO route of serum delivery into the main circulation. Twenty rabbits were used in our study. They were divided into two groups [odds as Gl, n=10, evens as G2, n=10]. After laparotomy, the aorta was located and can-nulated by a 16 gauge angiocatheter. For IV injection in Gil, the marginal vein of either ear was accessed. For IO injection in Gl, the medial surface of the proximal extremity of left tibia was used. Once satisfied with positioning, 10 ml of methylene blue solution at a concentra-i tion of 10 mg /ml was injected and the time was recorded. The time taken from injection to appearance of MB in the aorta was measured. All rabbits survived until the end of the experiment. There was no significant difference between the groups regarding the body weight. There was no significant difference between mean time of dye entry into the aorta in either group. It was 9.66 +/- 2.51 seconds in Gl and 10.24 +/- 1.95 seconds in G2 [P = 0.56]. Our study demonstrated that there was no significant difference between the time taken for MB to reach the central circulation via IO or IV routes