Sensitivity of a disposable end-tidal carbon dioxide detector

Area of Science:

• Anesthesiology
• Critical Care Medicine
• Medical Devices

Background:

• Accurate endotracheal tube placement is crucial for patient safety during mechanical ventilation.
• Current methods for confirming placement can be time-consuming or require specialized equipment.
• A simple, disposable device for real-time verification of endotracheal tube placement is needed.

Purpose of the Study:

• To evaluate the sensitivity of a commercially available disposable carbon dioxide detector.
• To determine the minimum carbon dioxide concentration required for a visible color change in the device.
• To assess the utility of this detector for confirming endotracheal tube placement in various clinical scenarios.

Main Methods:

• Ten volunteers participated in a blinded study using an airway circuit/lung model.
• Varying concentrations of carbon dioxide were introduced into the model.
• The lowest detectable carbon dioxide concentration causing a color change in the disposable detector was recorded.

Main Results:

• The mean minimum carbon dioxide concentration for a detectable color change was 0.54% (4.1 mm Hg).
• The range for detection was 0.25% to 0.60% (1.9 to 4.6 mm Hg).
• The device demonstrated sensitivity to low carbon dioxide levels.

Conclusions:

• The disposable carbon dioxide detector is sensitive enough to confirm endotracheal tube placement.
• The device can reliably detect carbon dioxide, even in patients with low end-tidal CO2 levels, such as during cardiopulmonary resuscitation.
• This detector offers a practical and effective method for verifying endotracheal tube placement in clinical practice.