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The apnea-hypopnea index (AHI) plays a major role in determining whether a patient suffers from SAHS, as well as in evaluating the severity of his/her condition. To obtain this index the number of apneas and hypopneas that the patient has experienced during his/her sleep is calculated, and the result is divided by the number of hours of sleep. The standard definitions of apnea and hypopnea require...
This paper presents an algorithm that permits the identification of apneas - cessations in the sleeping patient's respiratory flow - in the respiratory airflow signal and relates them to the drops in blood oxyhemoglobin saturation that they produce. The structural nature of the algorithm allows us to perform a detailed characterization of the identified events and to easily modify the morphological...
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