Contributed by James A. Rowley, MD
Name each of the events marked by the arrows.
The figure shows four 30-second epochs of sleep from an adult sleep study. Shown are two complete obstructive apneas with associated events as below.
#1: obstructive apneas
#2: paradoxical movement of the thorax and abdomen in the effort channels
#3: oxyhemoglobin desaturation
#4: arousal
#5: leg movement
Abbreviations: LOC: left oculogram; ROC: right oculogram; CHIN: chin EMG; C3A2, C4A1: central EEG leads; O1A2, O2A1: occipital EEG leads; LLEG: left leg EMG; RLEG: right leg EMG; PSNR: snoring channel; CPAP: CPAP flow channel; FLOW: nasal pressure flow channel; THOR: thorax effort channel; ABDM: abdominal effort channel; EKG: electrocardiogram; SAO2: oxygen saturation channel.
Source: overnight polysomnography Species: human
