Patent ID: 11896388
Assignee: RESMED PTY LTD
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A

Claim 0:
1. A method for a controlled ventilatory apparatus to automatically determine an absence or a presence of Cheyne-Stokes breathing in a person, the method comprising:
accessing, with one or more processors, a signal indicative of respiration of a person derived from a sensor;
detecting, with the one or more processors, a plurality of events from the signal, wherein each one of the detected events comprises an apnea or a hypopnea, followed by a hyperpnoea;
deriving, with the one or more processors, a jump feature for each one of the detected events, wherein the deriving comprises calculating, for each one of the detected events, a maximum increase from multiple increases of the respective hyperpnoea, and wherein each one of the multiple increases is determined from a predetermined time interval in a period of the respective hyperpnoea between its beginning and its maximum;
determining, with the one or more processors, a peak in a frequency spectrum of the signal;
determining, with the one or more processors and a trained classifier, the absence of Cheyne-Stokes breathing based on a first jump feature of the plurality of derived jump features, wherein the trained classifier is of a supervised machine learning type, and wherein the trained classifier was provided with a data set during training that comprised a plurality of jump features and corresponding diagnoses;
determining, with the one or more processors and the trained classifier, the presence of Cheyne-Stokes breathing based on a combination of the peak in the frequency spectrum and a second jump feature of the plurality of derived jump features, wherein the first jump feature is greater than the second jump feature such that the first jump feature characterizes a hyperpnoea typical of obstructive sleep apnea and the second jump feature characterizes a hyperpnoea typical of Cheyne-Stokes breathing; and
issuing a report based on probability of an epoch being assigned to a class based on the determined absence or presence of Cheyne-Stokes breathing.