1. From: Upper Airway Sleep-Disordered Breathing in Women
Ann Intern Med. 1995;122(7): doi: /
Figure Legend:
Polygraph showing a progressive increase in respiratory effort over time in a woman with symptoms of sleep-disordered breathing.eses esThis 36-year-old woman had symptoms of daytime fatigue and sleepiness in quiet situations. Note that the end-inspiratory pressure peak became progressively more negative; this peak was monitored with the esophageal catheter (P ) on the second channel from the bottom. When the respiratory effort became too great (as indicated by P monitoring), an arousal occurred. It took 15 minutes for the arousal to occur without any monitored oxygen saturation change. Air flow = nose and mouth thermistors; chest = Respitrace (Ambulatory Monitoring, Inc., Ardsley, New York) recorespiratory disturbance indexing (that is, thorax and abdomen); A , C , and O are electrode placement sites (A = left auricular, C = left central, and O = right occipital); EEG = electroencephalogram; EKG = electrocardiogram indexogram (modified V lead); EMG (channel 3 from top) = chin electromyogram and (channel 7 from top) leg electromyogram; EOG = electro-oculogram; Mic = microphone (note the absence of snoring); and P ( ) = esophageal pressure. The last channel measures oxygen saturation obtained from finger pulse oximetric recorespiratory disturbance indexing.
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