Validation of nasal pressure for the identification of apneas/hypopneas during sleep.

摘要: The reference standard for identifying apneas and hypopneas is a pneumotachograph, but using this can disrupt sleep. Nasal airflow estimation by measuring nasal pressure via prongs better tolerated patients. However, has not been validated, an event-by-event analysis, detecting apneas/hypopneas during Eleven patients undergoing polysomnography wore mask capable of (via pneumotachograph) simultaneously. Each study was screened respiratory disturbances, from these 550 were randomly selected blindly scored as apnea/hypopnea or no event each the pressure, square root inductance sum signals independently. Agreement measured Cohen's kappa statistic. Intermeasurement agreements between pneumotachograph plethysmography 0.76, 0.73, 0.50, respectively. Inter- intrarater were, respectively, 0.68 0.60 0.66 0.82 0.61 0.78 0.47 0.76 sum. These results indicate that excellent agreement compared with very good inter-/intrarater agreement. Square transformation signal does improve levels agreement, indicating it unnecessary in routine clinical practice scoring apneas/hypopneas.