Monitoring or ventilation apparatus for cardiopulmonary resuscitation with determination of an airway opening index

A monitoring and/or respiratory assistance apparatus (1) that can be used during a cardiopulmonary resuscitation (CPR) with successive chest compressions of duration (dt) performed on the patient and with relaxations, said apparatus comprising:

• a CO2 content measurement sensor (10) configured and adapted for measuring a concentration of CO2 produced by a patient during the cardiopulmonary resuscitation (CPR), and to supply a CO2 content measurement signal to a signal-processing system (11),
• the signal-processing system (11) configured and adapted to process the CO2 content measurement signal originating from the CO2 content measurement sensor (10), and
• at least one graphical user interface (GUI) (14), characterized in that the signal-processing system (11) is configured to:
• a) determine at least one maximum CO2 content value (Vmax) and at least one minimum CO2 content value (Vmin), during at least one duration (dt) of at least one chest compression (CC), and
• b) calculate at least:
• one airway opening index AOI such that:
• AOI=(Vmax-Vmin)/Vmax
• Or
• a mean index AOImean on the basis of several successive opening indices AOI obtained during the durations (dt) of n successive chest compressions (with n>1), and
• c) transmit to said graphical user interface (14) at least one index value AOI or at least one mean index value AOImean, and
• the graphical user interface (14) is configured to display said at least one index value AOI or mean index value AOImean, or a graphical representation (16) of said at least one index value AOI or mean index value AOImean.