UNLABELLED: We developed in cooperation with F. D. Stott, Oxford, the Mobile 10-Channel Unit SIDAS 10, a recording instrument for diagnosing sleep-related breathing disorders, to cope with the large number of patients requiring to be diagnosed. Studies that have already been published prove the clinical worth of this instrument that has been conceived as a mobile unit for the diagnosis of sleep-related breathing disorders outside a conventional sleep laboratory. To test the validity of this unit the present study was designed as a comparative study of conventional polygraphs versus SIDAS recordings. METHOD: 20 unselected patients (18 men, 2 women), average age 54.8 (34-65) years, body mass index (BMI) 29.8 (20.2-46.2) kg/m2, were examined parallel for one night in the sleep laboratory. We compared the breathing a) recorded with nasal airflow, oesophageal pressure, oxygen saturation and b) with induction plethysmography, ITP (a non-invasive recording of intrathoracic pressure variations), nasal airflow and pulse oxymetry via SIDAS 2010. The writeouts were evaluated visually according to internationally valid criteria. RESULTS: We found 10 patients with an apnoea index (AI) > 10/h (mean AI 53.2), 4 patients with AI between 5 and 10/h (mean AI 6.4) and 6 patients with an AI < 5/h (mean AI 3.4). 5835 apnoeas and hypopnoeas were evaluated. The statistical analyses yielded the following results: equal classification of central apnoeas in 87%, of obstructive apnoeas in 90% and of mixed apnoeas in 92% of the cases; on the whole, 10% more hypopnoeas were classified in the SIDAS recordings.(ABSTRACT TRUNCATED AT 250 WORDS)
UNLABELLED: We developed in cooperation with F. D. Stott, Oxford, the Mobile 10-Channel Unit SIDAS 10, a recording instrument for diagnosing sleep-related breathing disorders, to cope with the large number of patients requiring to be diagnosed. Studies that have already been published prove the clinical worth of this instrument that has been conceived as a mobile unit for the diagnosis of sleep-related breathing disorders outside a conventional sleep laboratory. To test the validity of this unit the present study was designed as a comparative study of conventional polygraphs versus SIDAS recordings. METHOD: 20 unselected patients (18 men, 2 women), average age 54.8 (34-65) years, body mass index (BMI) 29.8 (20.2-46.2) kg/m2, were examined parallel for one night in the sleep laboratory. We compared the breathing a) recorded with nasal airflow, oesophageal pressure, oxygen saturation and b) with induction plethysmography, ITP (a non-invasive recording of intrathoracic pressure variations), nasal airflow and pulse oxymetry via SIDAS 2010. The writeouts were evaluated visually according to internationally valid criteria. RESULTS: We found 10 patients with an apnoea index (AI) > 10/h (mean AI 53.2), 4 patients with AI between 5 and 10/h (mean AI 6.4) and 6 patients with an AI < 5/h (mean AI 3.4). 5835 apnoeas and hypopnoeas were evaluated. The statistical analyses yielded the following results: equal classification of central apnoeas in 87%, of obstructive apnoeas in 90% and of mixed apnoeas in 92% of the cases; on the whole, 10% more hypopnoeas were classified in the SIDAS recordings.(ABSTRACT TRUNCATED AT 250 WORDS)