Patent ID: 7766842

Claim:
An implantable medical device, comprising: a respiration sensor configured to sense respiration of a patient and to generate a respiration signal; an artifact sensor configured to sense a signal indicative of non-respiration related artifacts and to generate an artifact signal; a disordered breathing detector configured to avoid erroneous detections of disordered breathing based on the artifact signal, the disordered breathing detector further configured to determine characteristics of the respiration signal, including at least determining one or both of tidal volumes and breath intervals from the respiration signal, to compare the characteristics of the respiration signal to one or more respiration metrics, and to detect the disordered breathing based on the comparison, the disordered breathing detector further configured to determine characteristics of the disordered breathing, including at least an apnea/hypopnea index; a memory coupled to the disordered breathing detector and configured to store the characteristics of disordered breathing; and a sleep detector configured to determine if the patient is awake or asleep based on a sleep threshold that is adjustable using another sleep-related signal.