A system and method for non-invasively generating a report of cardiac electrical activities of a subject includes determining, using cardiac electrical activation information, equivalent current densities (ECDs). The ECDs are assembled into time-course ECD information and a spectrum of the time-course ECD information is analyzed to determine peaks for spectral characteristics of atrial fibrillation (AF). The spectral characteristics of AF are correlated with potential electrical sources of the AF and a report is generated indicating the potential electrical sources of the AF spatially registered with the medical imaging data.

An electrocardiography monitor configured for self-optimizing ECG data compression is provided. ECG waveform characteristics are rarely identical in patients with cardiac disease making this innovation crucial for the long-term data storage and analysis of complex cardiac rhythm disorders. The monitor includes a memory and a micro-controller operable to execute under a micro-programmable control and configured to: obtain a series of electrode voltage values; select one or more of a plurality of compression algorithms for compressing the electrode voltage series; apply one or more of the selected compression algorithms to the electrode voltage series; evaluate a degree of compression of the electrode voltage series achieved using the application of the selected algorithms; apply one or more of the compression algorithms to the compressed electrode voltage series upon the degree of compression not meeting a predefined threshold; and store the compressed electrode voltage series within the memory.

According to at least one example, an ambulatory medical device is provided. The device includes a plurality of electrodes disposed at spaced apart positions about a patient's body and a control unit. The control unit includes a sensor interface, a memory and a processor. The sensor interface is coupled to the plurality of electrodes and configured to receive a first ECG signal from a first pairing of the plurality of electrodes and to receive a second ECG signal from a second pairing of the plurality of electrodes. The memory stores information indicating a preferred pairing, the preferred pairing being either the first pairing or the second pairing. The processor is coupled to the sensor interface and the memory and is configured to resolve conflicts between interpretations of first ECG signal and the second ECG signal in favor of the preferred pairing.

The present disclosure relates to a wearable monitor device and methods and systems for using such a device. In certain embodiments, the wearable monitor records cardiac data from a mammal and extracts particular features of interest. These features are then transmitted and used to provide health-related information about the mammal.

A system and method for facilitating a cardiac rhythm disorder diagnosis based on subcutaneous cardiac monitoring data with the aid of a digital computer are provided. Cutaneous action potentials of a patient are recorded as electrocardiogram (EGC) data over a set time period using a subcutaneous insertable cardiac monitor. A set of R-wave peaks is identified within the ECG data and an R-R interval plot is constructed. A difference between recording times of successive pairs of the R-wave peaks in the set is determined. A heart rate associated with each difference is also determined. The pairs of the R-wave peaks and associated heart rate are plotted as the R-R interval plot. A diagnosis of cardiac disorder is facilitated based on patterns of the plotted pairs of the R-wave peaks and the associated heart rates in the R-R interval plot.

A system and method for classifier-based atrial fibrillation detection with the aid of a digital computer are provided. Electrocardiography (ECG) features and annotated patterns of the features are maintained in a database, at least some of the patterns associated with atrial fibrillation. A classifier is trained based on the annotated patterns. A representation of an ECG signal recorded by one or more ambulatory monitors is received. ECG features in the representation falling within each of the temporal windows are detected. The trained classifier is used to identify patterns of the ECG features. At least one matrix with weights for the patterns are generated. A value indicative of whether portions of the representation are associated the patient experiencing atrial fibrillation is calculated. That one or more of the portions are associated with the patient experiencing atrial fibrillation is determined. An action is taken based on one or more of the determinations.

An extended wear electrocardiography patch is provided. A flexible backing includes an elongated strip of stretchable material. An electrocardiographic electrode is respectively affixed to and conductively exposed on each end of the elongated strip. A flexible circuit is affixed on each end to the elongated strip and includes a pair of circuit traces each originating within one of the ends of the elongated strip and coupled to one of the electrocardiographic electrodes. A non-conductive receptacle securely adhered on the one end of the elongated strip and includes electrode terminals aligned to interface the pair of circuit traces to an electrocardiography monitor to obtain electrocardiographic signals through the electrocardiographic electrodes. A crypto circuit includes memory programed with a sampling rate for at least one physiological sensor provided at least one of with the electrocardiography monitor and on the flexible backing to instruct the physiological sensor to obtain readings of physiological data.

A heartbeat analyzer analyzes heartbeats of a living body to which a pacing device for outputting pacing pulses to cause a heart to beat is placed. The heartbeat analyzer includes: a heartbeat detecting section that detects the heartbeats; a pulse detecting section that detects outputs of the pacing pulses; a heartbeat determining section that determines whether the heartbeats are paced beats due to the pacing pulses or not, based on detection timings of the pacing pulses; a tachycardia determining section that, in a case where the paced beats are in a number that is equal to or larger than a predetermined heart rate, and are contained in the heartbeats at a predetermined ratio or more, determines that pacing tachycardia caused by the pacing pulses occurs in the living body; and a notifying section that notifies of the occurrence of the pacing tachycardia.

A system for facilitating a cardiac rhythm disorder diagnosis with the aid of a digital computer is provided. A download station retrieves cutaneous action potentials of a patient recorded over a time by an ECG device as ECG data. An R-R interval plot of the ECG data includes R-R intervals plotted along an x-axis of the plot and heart rates associated with the R-R intervals plotted along a y-axis. The R-R intervals are calculated as a difference between recording times of successive pairs of R-wave peaks. Each heart rate is associated with each time difference. One or more portions of the R-R intervals are identified in the plot. Each portion of the R-R intervals includes a cardiac event. Report strips are generated and each includes one portion of the R-R intervals and a portion of the ECG data. The report strips are included in a cardiac report for the patient.

A monitor recorder optimized for electrocardiography and respiratory data acquisition and processing is provided. The recorder includes a sealed housing and an electronic circuitry comprised within the sealed housing, which includes an electrocardiographic front end circuit electrically interfaced to an externally-powered micro-controller and operable to sense electrocardiographic signals through electrodes provided on the patch; the micro-controller interfaced to one or more respiratory sensors, the micro-controller operable to sample the electrocardiographic signals, to sample respiratory events detected by the one or more respiratory sensors upon receiving one or more signals from the one or more respiratory sensors, to buffer each of the respiratory event samples, to compress each of the buffered respiratory event samples, to buffer each of the compressed respiratory event samples, and to write the buffered compressed respiratory event samples and the samples of the electrocardiography signals into an externally-powered flash memory; and the memory interfaced with the micro-controller.