Sternal Morphologic Characteristics of U.S. Military Males by Computed Tomography: Implications for Intraosseous Access.

Introduction: Sternal intraosseous (IO) access has advantages over humeral and tibial access for fluid resuscitation in military medical settings due to superior flow rates and pharmacokinetics. However, the morphology of the young adult manubrial cortical and medullary bone as it relates to IO catheter tips of currently available FDA-approved IO access devices is unclear.

Materials And Methods: Computed tomography manubrium images of active duty service members (N = 93) aged 18 to 30 were assessed by radiologists, including manubrial height, width, and cortical thickness, as well as total thickness and medullary thickness at the thickest (superior) and thinnest (inferior) parts of the manubrium. Inference regarding medullary or cortical IO catheter tip placement rates were made for FAST1 (5.5 mm catheter depth) and TALON (4.5 mm catheter depth) sternal IO devices. Data were analyzed using ANOVA, non-parametric, and correlational statistics at P < 0.05.

Results: As inferred from case-specific CT-derived manubrium dimensions and maximal catheter tip penetration depths, both FAST1 and TALON would be placed in the target medullary space on 100% of opportunities if properly applied in the superior manubrium and on 99% of opportunities if properly applied in the inferior manubrium. Age was not significantly related to IO-relevant manubrial dimensions.

Conclusions: Present findings suggest that both FAST1 and TALON sternal IO catheter tips can be successfully placed into the target medullary bone with high accuracy in male military members aged 18 to 30 who require rapid resuscitation.