oxygen entrainment in NIV

Oxygen entrainment in non-invasive ventilation (NIV) involves adding supplemental oxygen to the ventilatory circuit to maintain adequate oxygen saturation levels in patients. This process can be done by feeding oxygen either directly into the mask or proximally into the circuit[1]. The location of oxygen entrainment can significantly affect the delivered fractional inspired oxygen (FiO2) and pressure to the patient. For instance, entraining oxygen at the back of the machine results in a linear increase in FiO2 with flow rate, plateauing around 10 L/min. In contrast, entraining oxygen at the patient end, such as directly into the heat and moisture exchange filter, results in a rapid increase to maximum FiO2 levels at lower flow rates[3][6].

The choice of entrainment site can impact patient-ventilator synchronization and the overall effectiveness of NIV. Proper management of oxygen flow rates and entrainment sites is crucial to ensure adequate oxygen delivery without compromising ventilator function or patient comfort[1][3]. Understanding these dynamics helps clinicians optimize NIV settings for individual patients, especially those with conditions like COPD or during acute exacerbations[1][4].

Citations:

[1] The effect of entrainment site and inspiratory pressure on the ... https://err.ersjournals.com/content/15/101/190

[2] General initiation protocol for long-term NIV - Education by Breas https://www.educationbybreas.com/general-initiation-protocol-for-long-term-niv/

[3] Effect of entraining oxygen at different locations in a noninvasive ... https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7480441/

[4] Noninvasive Ventilation and Oxygenation Strategies - PMC - NCBI https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8598279/

[5] A comprehensive guide to noninvasive ventilation (NIV) https://www.hamilton-medical.com/de_DE/Article-page~knowledge-base~0a23091e-4fb0-4626-964d-a36ff984b8dc~A-comprehensive-guide-to-noninvasive-ventilation--NIV-~.html

[6] Effect of entraining oxygen at different locations in a noninvasive ... https://www.bjanaesthesia.org.uk/article/S0007-0912(20)30743-1/fulltext

[7] [PDF] Effect of entraining oxygen at different locations in a noninvasive ... https://www.bjanaesthesia.org.uk/article/S0007-0912(20)30743-1/pdf

[8] Noninvasive Ventilation: Overview, Methods of Delivery, General ... https://emedicine.medscape.com/article/304235-overview