Multicenter study of a portable, hand-size, colorimetric end-tidal carbon dioxide detection device

Area of Science:

• Emergency Medicine
• Critical Care
• Respiratory Physiology

Background:

• Accurate endotracheal tube (ET) placement is critical for effective ventilation and patient outcomes.
• Prehospital and emergency department settings present unique challenges for confirming ET tube placement.
• Continuous monitoring can provide real-time data for airway management and resuscitation assessment.

Purpose of the Study:

• To evaluate the utility of continuous, semiquantitative end-tidal carbon dioxide (ETCO2) monitoring.
• To confirm proper endotracheal tube placement in prehospital and emergency settings.
• To assess prognosis and blood flow during cardiopulmonary resuscitation (CPR).

Main Methods:

• Adult patients requiring endotracheal intubation for various reasons were studied.
• A portable, colorimetric ETCO2 detector was used immediately after intubation.
• ETCO2 readings were assessed for correlation with tube placement, return of spontaneous circulation, and survival.

Main Results:

• The colorimetric ETCO2 device demonstrated high sensitivity and specificity for confirming ET tube placement in non-arrest patients.
• In cardiac arrest patients, ETCO2 readings correlated with the duration of arrest and predicted proper tube placement.
• ETCO2 values >0.5% were associated with survival to hospital admission in cardiac arrest patients.
• Improved ETCO2 values often accompanied return of spontaneous circulation and mechanical CPR yielded higher ETCO2 than manual CPR.

Conclusions:

• Colorimetric ETCO2 monitoring is a reliable method for confirming endotracheal tube position in non-arrest patients.
• In cardiac arrest, ETCO2 levels are valuable for confirming tube placement and can indicate underlying issues like inadequate circulation or prolonged downtime.
• This monitoring tool aids in optimizing airway management and assessing resuscitation effectiveness.