Case Reports in Pediatrics / 2018 / Article / Tab 1

Case Report

Use of Noninvasive Ventilation with Volume-Assured Pressure Support to Avoid Tracheostomy in Severe Obstructive Sleep Apnea

Table 1

Polysomnography parameters at baseline and on CPAP and AVAPS-AE.

ParameterBaselineCPAP titrationAVAPS-AE titration

Total sleep time (min)323.5358.0429.0
Sleep efficiency (%)78.582.397.1
Sleep latency (min)0.53.03.0
R latency (min)175.5238.8132.5
Wake (min) (%)88.5 (21.5)77.0 (17.7)13.0 (2.9)
N1 (min) (%)1.0 (0.2)0.0 (0.0)0.0 (0.0)
N2 (min) (%)238.5 (57.9)175.5 (40.3)268.0 (60.6)
N3 (min) (%)63.5 (15.4)127.0 (29.2)72.5 (16.4)
R (min) (%)20.5 (5.0)55.5 (12.8)88.5 (20.0)
Arousals index (arousals/h)72.339.712.3
Periodic limb movement index (events/h)0.00.00.0
Apnea-hypopnea index (events/h)138.257.59.7
Obstructive apnea index (events/h)122.044.10.1
Mean SpO2 (%)929497
Minimum SpO2 (%)597293
Time SpO2 ≤ 90% (min)111.755.90.0
Baseline ETCO2 (mm Hg)503647
Maximum ETCO2 (mm Hg)604851
Time ETCO2 ≥ 50 (mm Hg) (min)123.30.00.7

Note. On diagnostic (baseline) polysomnography, oxygen at 0.25 L/min via nasal cannula was added 40 min after sleep onset due to severe hypoxemia without rebound and maintained for the remainder of the study. CPAP and AVAPS-AE studies were done in room air. AVAPS-AE, average volume-assured pressure support with autotitrating expiratory positive airway pressure; CPAP, continuous positive airway pressure; R, rapid eye movement sleep; N, nonrapid eye movement sleep; SpO2, oxygen saturation by pulse oximetry; ETCO2, end-tidal carbon dioxide.

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