Abstract
AimsQuantitatively measure and validate analysis of neural respiratory drive (NRD) using a commercial polysomnography system in children during sleep. MethodSurface electromyogram of the diaphragm (sEMGdi) recorded from primary snoring children were analysed. A subset was re-analysed to assess intra- and inter-investigator reproducibility. Effects of different band pass filter settings (20–100Hz vs 10–1000Hz) on sEMGdi amplitude were evaluated. ResultsMean sEMGdi from 45 children aged 4.38 years (median; IQR 3.00–7.96) was 5.05μV (SD 2.73). The sEMGdi had a high intra-subject intraclass correlation coefficient (ICC) of 0.88. sEMGdi analysis was reproducible with high ICC between occasions (0.99; 95% CI 0.98–0.99) and between investigators (0.98; 95% CI 0.97–0.99). There was also a high ICC (0.99, 95% CI 0.96–1.00) between the sEMGdi measured using different band-pass filter settings. Age and BMI were negative predictors of sEMGdi (p<0.0001 and p=0.0004 respectively). ConclusionNRD in children during sleep as assessed by sEMGdi can be quantified in a reliable and reproducible fashion.
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