OBJECTIVE: To determine the time it takes for O2 saturation measured by pulse oximetry to equilibrate after a change is made in supplemental O2 administered by nasal cannula in patients with cardiac and pulmonary disease. METHODS: A prospective, observational study of a convenience sample of 51 patients treated in a university-affiliated ED with nasal cannula O2. Patients were placed on and/or subsequently taken off O2 via nasal cannula set at 2 or 4 L/min based on clinical indications. Oxygen saturation was measured at 1-minute intervals over a 30-minute period using finger-probe pulse oximetry. Of the 51 patients in the study, 43 were monitored while O2 treatment was initiated and 18 were monitored when it was discontinued. RESULTS: Most (95%) of the patients placed on O2 attained equilibration of O2 saturation within 3.5 minutes. Most (95%) of the patients taken off supplemental O2 attained equilibration of O2 saturation within 4.5 minutes. CONCLUSION: The interval to equilibration of O2 saturation in patients receiving O2 by nasal cannula is considerably shorter than the 20-30 minutes generally suggested. Adequacy of O2 supplementation should be assessable much sooner than was previously taught.
OBJECTIVE: To determine the time it takes for O2 saturation measured by pulse oximetry to equilibrate after a change is made in supplemental O2 administered by nasal cannula in patients with cardiac and pulmonary disease. METHODS: A prospective, observational study of a convenience sample of 51 patients treated in a university-affiliated ED with nasal cannula O2. Patients were placed on and/or subsequently taken off O2 via nasal cannula set at 2 or 4 L/min based on clinical indications. Oxygen saturation was measured at 1-minute intervals over a 30-minute period using finger-probe pulse oximetry. Of the 51 patients in the study, 43 were monitored while O2 treatment was initiated and 18 were monitored when it was discontinued. RESULTS: Most (95%) of the patients placed on O2 attained equilibration of O2 saturation within 3.5 minutes. Most (95%) of the patients taken off supplemental O2 attained equilibration of O2 saturation within 4.5 minutes. CONCLUSION: The interval to equilibration of O2 saturation in patients receiving O2 by nasal cannula is considerably shorter than the 20-30 minutes generally suggested. Adequacy of O2 supplementation should be assessable much sooner than was previously taught.
Authors: Deog Kyeom Kim; Francine L Jacobson; George R Washko; Richard Casaburi; Barry J Make; James D Crapo; Edwin K Silverman; Craig P Hersh Journal: Respir Med Date: 2011-03-10 Impact factor: 3.415
Authors: Michael H Cho; Brian D Hobbs; Jingzhou Zhang; Dawn L DeMeo; Edwin K Silverman; Barry J Make; R Chad Wade; J Michael Wells Journal: BMC Pulm Med Date: 2021-07-14 Impact factor: 3.320