Abstract: It is presented a method for analysing heart data of a user. The method comprises the steps of: receiving phonocardiogram data from a portable sensor device; receiving electrocardiogram data from the portable sensor device, wherein the electrocardiogram data corresponds to the phonocardiogram data in time; dividing the phonocardiogram data in time segments based on cardiac cycles identified using at least one of the phonocardiogram data and the electrocardiogram data; dividing the electrocardiogram data in time segments corresponding to the time segments of the phonocardiogram data; and determining whether the heart is considered to need further examination or not based on only time segments of the phonocardiogram data and the electrocardiogram data where the quality of the phonocardiogram data is greater than a threshold level and the quality of the electrocardiogram data is greater than a threshold level.

Abstract: The present invention relates to a method for analysing an intracardiac electrocardiogram to identify at least one of the A wave, V wave and H wave on at least one of the electrogram signals, comprising the steps of pre-processing the electrogram signal; calculating an adaptive threshold for the A, V or H wave, wherein the adaptive threshold depends on the noise level of the electrogram signal and on the type of wave; and identifying the A, V or H wave by searching the electrogram signal within a time window determined e.g. from the position of another wave on the same or another electrogram signal.

Abstract: In a method of and apparatus for deriving indices characterizing atrial arrhythmias, a temporally isolated portion of a digital representation of a time-domain electrical signal originating from the atria of a patient is frequency analyzed to provide a corresponding frequency spectrum. The obtained frequency spectrum is compared with a template frequency spectrum, selectively adapted dependent on previously obtained frequency spectra from different temporally isolated portions, to determine a frequency shift value and an amplitude value that optimize a correlation between the two spectra. An output representing the two determined values is used, possibly together with parameters describing the template frequency spectrum, to classify an atrial arrhythmia manifest in the digital representation.

Abstract: In a method of and apparatus for deriving indices characterizing atrial arrhythmias, a temporally isolated portion of a digital representation of a time-domain electrical signal originating from the atria of a patient is frequency analyzed to provide a corresponding frequency spectrum. The obtained frequency spectrum is compared with a template frequency spectrum, selectively adapted dependent on previously obtained frequency spectra from different temporally isolated portions, to determine a frequency shift value and an amplitude value that optimize a correlation between the two spectra. An output representing the two determined values is used, possibly together with parameters describing the template frequency spectrum, to classify an atrial arrhythmia manifest in the digital representation.

Abstract: A computerized apparatus for processing a multi-lead ECG beat signal to generate a residual signal has an averager unit for providing a template ventricular beat signal, and a subtraction unit for subtracting the template beat signal from the multi-lead ECG beat signal to generate the residual signal. An alignment stage is disposed before the subtraction unit and compares the template beat signal with an intermediate beat signal in the alignment parameter generator. A further subtraction unit may be provided to receive the multi-lead ECG beat signal and to subtract a signal representative of an estimated atrial signal therefrom to generate the intermediate beat signal. The alignment stage also modifies the template beat to increase the relative alignment of the two signals, with respect to at least spatial, characteristics, and emits the modified signal as an output for use by the subtraction unit as the template beat signal.