Key things to look for in REM behavior disorder montage are:

Key things to look for in REM behavior disorder montage are:

• A. Muscle movements, increased chin EMG activity, and obstructive apneas in REM
• B. Muscle movements, increased chin EMG activity, and central apneas in REM
• C. Muscle movements, decreased chin EMG activity, and obstructive apnea in REM
• D. Muscle movements and increased chin EMG activity in REM

Answer: (D)

REM behavior disorder is defined by loss of normal REM atonia, so you look for ongoing muscle activity during REM. The most telling signs on the montage are observable muscle movements alongside increased chin EMG activity during REM, indicating that the usual REM-related suppression of tone isn’t occurring. Obstructive or central apneas are not defining features of this condition on its montage and aren’t required to make the diagnosis; they may appear incidentally but don’t reflect the core impairment in REM inhibition. So the best findings are muscle movements with increased chin EMG activity during REM, reflecting REM without atonia.

REM behavior disorder is defined by loss of normal REM atonia, so you look for ongoing muscle activity during REM. The most telling signs on the montage are observable muscle movements alongside increased chin EMG activity during REM, indicating that the usual REM-related suppression of tone isn’t occurring. Obstructive or central apneas are not defining features of this condition on its montage and aren’t required to make the diagnosis; they may appear incidentally but don’t reflect the core impairment in REM inhibition. So the best findings are muscle movements with increased chin EMG activity during REM, reflecting REM without atonia.