Use of the Respiratory Magnetometer in Diagnosis and Classification of Sleep Apnea

Mechanism of gastroesophageal reflux in patients with obstructive sleep apnea syndrome

“…Esophageal pressure is measured as the most sensitive marker of inspiratory effort in sleep studies in place of intrathoracic pressure 6 . In previous studies, esophageal pressure measurements have shown that end‐inspiratory esophageal pressure gradually decreases relative to respiratory efforts during OSA events 6–8 . Based on this finding, the pressure gradient between negative esophageal pressure and positive gastric pressure during OSA has been assumed to induce GER events.…”

Primary sleep apnoea syndrome.

“…The sudden rise of SaO2 lagged behind the resumption of effective gas exchange as shown by a deflection in the thermistor tracings and pneumographs by about 6 to 12 seconds (figs 2 and 4) representing the circulation time from the lung to the ear where SaO2 was being registered. 4 Heart rate In all patients each apnoeic episode was accompanied by relative bradycardia followed 10. Note regular breathing accompanied by phasic inspiratory (upward deflection in airflow and pneumogram) bursts in all EMG and EGG during wake EEG preceded andfollowed by obstructive apnoea (only a small portion is shown in the tracing) during stage I non-REM sleep.…”

“…All patients were referred because of excessive daytime somnolence lasting from a few minutes to 2 hours for the 970 8,10,12,13,18). Four patients (cases 1, 6, 7, 9) had diabetes mellitus.…”

Sleep Apnoea in Diabetic Patients with Autonomic Neuropathy

“…Traces were analysed for periods of apnoea lasting 10 seconds or longer during sleep. Apnoeas were classified as central (absent airflow with no rib cage or abdominal movement), obstructive (absent airflow with paradoxical inward rib cage movement) or mixed (central becoming obstructive) (Sharp et al 1980).…”