| http://www.w3.org/ns/prov#value | - If 40 seconds is a requirement, then these short-cycle events will be falsely characterized as obstructive (the default). (4) Flow limitation excludes a ???central hypopnea??? in the scoring manual yet this idea has been conclusively shown to be false from the following data: (a) at high-altitude, a pure chemoreflex form of sleep apnea, flow-limitation occurs frequently; (b) heart failure patients
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