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The objective of this study is to determine the multifactorial relationship between the effective fraction of inspired oxygen (Effective-FiO2) and the FiO2 in the gas delivered by the nasal cannula (NC-FiO2), NC flow rate, spontaneous minute ventilation and other patient characteristics in premature infants who receive supplemental oxygen via nasal cannula (NC).
During routine nasal cannula (NC) use in the newborn ICU, the actual fraction of oxygen inspired by the infant, i.e. the effective FiO2 (Effective-FiO2) that reaches the infant's airways, cannot be easily determined. The effective FiO2 during NC use is generally lower than the FiO2 in the gas delivered by NC at the infant's nose due to dilution with ambient gas entrained by the infants during spontaneous inspiration. The factors influencing effective FiO2 include the set FiO2 of the gas delivered by NC (NC-FiO2), the NC-flow rate, and the entrainment of ambient gas by the infant during each spontaneous inspiration. The individual contribution of each of these factors to the variability in effective-FiO2 in extreme premature infants has not been systematically evaluated.
The objective of this study is to determine the multifactorial relationship between the effective fraction of inspired oxygen (Effective-FiO2) and the FiO2 in the gas delivered by the nasal cannula (NC-FiO2), NC flow rate, spontaneous minute ventilation and other patient characteristics in premature infants who receive supplemental oxygen via nasal cannula (NC).
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Nasal cannula flow rate | Other | This is a crossover study where observations will be obtained at five nasal cannula flow rates: 0.5, 1, 2, 4 and 6 liters per minute. |
| Measure | Description | Time Frame |
|---|---|---|
| Nasal cannula FiO2 | FiO2 necessary to maintain the effective FiO2 (measured at the hypopharynx) at the basal level at different nasal cannula flow rates. | from birth upto 40 weeks corrected postmenstrual age |
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Inclusion Criteria:
Exclusion Criteria:
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Premature infants admitted to the newborn ICU will be screened. Infants who meet the inclusion criteria will be enrolled in the study after written informed parental consent is obtained:
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| Name | Affiliation | Role |
|---|---|---|
| Nelson Claure | University of Miami | Principal Investigator |
| Eduardo Bancalari | University of Miami | Principal Investigator |
| Deepak Jain | University of Miami | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| NICU at Holtz Children's Hospital | Miami | Florida | 33136 | United States |
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