In this pilot study, we demonstrated the feasibility of ∆TOI as a dynamic value rather than single static value among OHCA patients in a pre-hospital setting. ∆TOI can be considered as a predictor of return of spontaneous circulation (ROSC) and can guide CC rate.

Of the 81 patients included in the final analysis, 26 achieved ROSC and 55 did not achieve ROSC.

Other findings, such as, an absolute increase of 8 % or higher in TOI during pre-hospital CPR procedure is associated with ROSC and absolute decrease of 2 % or lower from the baseline is associated with non-ROSC, would be helpful to generate future cut-off values in this regard.

In this prospective observational study, we measured TOI in pre-hospital setting among OHCA patients receiving cardio-pulmonary resuscitation (CPR) during ambulance transportation between 2017 and 2018.

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