Duty ratio: a simple method for quantifying loop gain during breathing instability

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This proposal presents a new method for calculating the severity of sleep disordered breathing in patients. The proposal also tests the effectiveness of our method in experiments in animals and humans. The method, which requires no intervention in the patient, offers promise as a means for testing the efficacy of treatments for the unstable breathing pattern found in patients with heart failure in whom the presence of unstable breathing is associated with poor outcome.