<prompt> Which is not true of obstructive sleep apnea?Nocturnal asphyxiaAlcoholism is a cofactorProne to hypeensionSpirometry is diagnostic  <response>: An overnight sleep study, or polysomnography, is required to diagnose OSA. PSG: in-laboratory measurement of sleep architecture and EEG arousals, eye movements, oximetry, snoring, and leg movements OSAHS raises 24-h mean blood pressure. 