The aim of this document is to standardize the national definition of respiratory events during sleep when they are obtained through polysomnography or level III monitoring systems ("cardiorespiratory"). Since the identification of the respiratory events during sleep depends on the instrumentation used to detect airflow, the document recommends the use of nasal cannulas coupled with pressure transducers for airflow recording. The Authors defined the following indices obtained by polysonmography: - Apnea-hypopnea index (AHI): the number of apneas and/or hypopneas per hour of sleep. - Respiratory disturbance index (RDI): the number of apneas, hypopneas and Respiratory Effort Related Arousals (RERA) or Flow Limitation Arousals (FL-Arousal) per hour of sleep. In clinical practice, the RDI will be given by the sum of "apneas-hypopneas plus RERA" (when intrathoracic pressure is monitored) or "apneas-hypopneas plus FL-arousal" (when nasal pressure is recorded). - Oxyhaemoglobin desaturation index (ODI): the number of desaturations ≥ 4% per hour of sleep. The Authors defined the following indices derived by the cardiorespiratory monitoring systems: - Apnea-hypopnea index (AHIa): the number of apneas and/or hypopneas for hour of useful recording. - Oxyhaemoglobin desaturation index (ODI): the number of desaturations ≥ 4% per hour of useful recording. The "time of useful recording", which will be used for the calculation of the indices derived by the cardiorespiratory monitoring, means the number of hours spent in lateral or supine decubitus minus the recording time in orthostatism and the time spent with the lights on.
|Translated title of the contribution||Indices for the instrumental diagnosis of sleep apneas: Standardization of the calculation with polysomnography and cardiorespiratory monitoring|
|Number of pages||6|
|Journal||Rassegna di Patologia dell'Apparato Respiratorio|
|Publication status||Published - Feb 2006|
ASJC Scopus subject areas
- Pathology and Forensic Medicine
- Pulmonary and Respiratory Medicine