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Pharmacological effects. A 48-year-old male with complex sleep apnea and recurrent nocturnal arousals. Baseline: HFC = high-frequency coupling; LFC = low-frequency coupling; e-LFC = elevated-LFC; VLFC = very low frequency coupling; UNK = unknown (oscillations falling outside the other coupling ranges). Qual = ECG quality; Freq = frequency in Hz; Act = trunk actigraphy; g/second = gravitational acceleration/second.
