| 研究実績の概要 |
Purpose: We aimed to describe the sound pressure level (SPL) and sound frequency level (SFL) surrounding preterm infants within closed incubators utilizing either high frequency oscillation (HFO) or nasal directional positive airway pressure (nasal-DPAP) respiratory setting.
Methods: Eight preterm infants (corrected age < 33 weeks) participated in the study a total of 17 times (HFO, n = 8; nasal-DPAP, n = 9; total recording duration = 31 h 23 min). A covered microphone was located (1) beside the respirator, (2) near the neonate’s head inside the incubator with opened windows, and (3) near the neonate’s head inside the incubator with closed windows, and the sound was recorded with an international standards sound level meter. An equivalent continuous sound level (Leq) >45 dBa and SFL >1 kHz were considered high.
Results: The SPL inside the incubator did not correlate with the corrected age at observation. The mean Leq inside the incubator with closed windows was significantly higher in the nasal-DPAP group than in the HFO group. In the nasal-DPAP group, the inside Leq with closed windows did not significantly differ from the other values, whereas in the HFO group, the inside Leq with closed windows was significantly lower than that beside the respirator. The high-frequency range in the nasal-DPAP group was associated with a higher SPL than in the HFO group.
Conclusion: The care provider should assess the adverse effects of the sound produced by the respirator and take measures for preterm infants not exposed to noise exceeding optimal levels.
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