Table 2 Insertion data and success rates with manual needle, B.I.G. and EZ-IO:
From: Emergency intraosseous access in a helicopter emergency medical service: a retrospective study
IO device
Number of patients who recieved IO
Number of insertions
Success on
1.attempt
Success on 2. attempt
Failed insertions
First attempt success ** (95%CI)
Overall success *** (95%CI)
Manual needle 5* 6 2 1 0 3 40% (5-85) 50% (12-88)
B.I.G. 18* 22 10 1 1 10 56% (31-79) 55% (32-76)
EZ-IO 49 50 47 1 0 2 96% (86-100) 96% (86-100)
Total number 70* 78 59 3 1 15 84% 81%
Successes on first attempt were compared using exact chi-square test. The contrasts between EZ-IO® and the manual needle/Bone Injection Gun were significant (p < 0.01/p < 0.001). Manual needle vs. B.I.G. was not significant (p = 0.64).
* Two patients had the first attempt with a Manual needle, and the second attempt with a B.I.G.
** First attempt success is calculated using the "Success on 1. attempt" related to "Number of patients who received IO". *** Overall success is calculated using all successful attempts related to "Number of insertions".
IO - Intraosseous.