A method for secure physiological data acquisition and storage is provided. An identifier of a physiological monitoring device that is configured to store the identifier within a cryptographic circuit is obtained by a programming wand. A password for accessing physiological monitoring data collected using that device is generated based on at least a portion of the identifier. The password is encrypted using a secret key, and password is loaded into the cryptographic circuit. The secret key is loaded into a monitor recorder, wherein the monitor recorder retrieves the identifier and the password from the device, decodes the password, and offloads the physiological monitoring data together with the identifier and the decoded password. The identifier and the password are reported to at least one server. The offloaded physiological monitoring data is stored using the identifier. Access to the data is granted upon receipt of the decoded password from a user.

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.

An volume of a patient can be mapped with a system operable to identify a plurality of locations and save a plurality of locations of a mapping instrument. The mapping instrument can include one or more electrodes that can sense a voltage that can be correlated to a three dimensional location of the electrode at the time of the sensing or measurement. Therefore, a map of a volume can be determined based upon the sensing of the plurality of points without the use of other imaging devices. An implantable medical device can then be navigated relative to the mapping data.

Methods, noise detection devices, and differential voltage measuring systems are provided for detecting noise signals for the purpose of measuring cardiac movements in a patient. In the method, contact is made with the patient by at least two measuring electrodes having at least one associated measuring channel. Furthermore, a heartbeat measurement is performed. During the heartbeat measurement, signals from the patient are detected over the at least one measuring channel. Then, a check is made of whether the detected signals have been caused by noise by comparing the detected signals with at least one heartbeat type that was identified in the course of the learning procedure.

A method for secure physiological data acquisition and storage is provided. An identifier of a physiological monitoring device that is configured to store the identifier within a cryptographic circuit is obtained by a programming wand. A password for accessing physiological monitoring data collected using that device is generated based on at least a portion of the identifier. The password is encrypted using a secret key, and password is loaded into the cryptographic circuit. The secret key is loaded into a monitor recorder, wherein the monitor recorder retrieves the identifier and the password from the device, decodes the password, and offloads the physiological monitoring data together with the identifier and the decoded password. The identifier and the password are reported to at least one server. The offloaded physiological monitoring data is stored using the identifier. Access to the data is granted upon receipt of the decoded password from a user.

Described embodiments include a system, including sample-and-hold circuitry, configured to sample a plurality of intracardiac electrocardiographic (ECG) signals acquired by respective electrodes disposed within a heart of a subject, and a processor. The processor is configured to receive, from one or more contact-indicating sensors, contact-indicating signals that indicate respective likelihoods of the electrodes being in contact with tissue of the heart, and, in response to the likelihoods being different from each other, cause the ECG signals to be sampled, by the sample-and-hold circuitry, at different respective sampling frequencies. Other embodiments are also described.

A wearable medical device is provided for monitoring a cardiac condition of a patient, where the device is releasably mounted to the patient's chest and includes at least two skin-facing electrodes forming a first one or more ECG leads for ongoing monitoring of heart functioning and at least one touch electrode for intermittently obtaining additional circuit vectors for deriving additional metrics regarding the functioning of the patient's heart. Each touch electrode is configured to form an additional lead/vector that is a larger vector and/or separated by at least 15 from a corresponding first lead/vector formed from the first one or more ECG leads in a vector cardiogram representation of the first one or more ECG leads and the additional lead/vector.

The invention discloses a method, a system, a computer program and a device for determining the surface charge and/or dipole densities on heart walls. Using the foregoing, a table of dipole densities (P, t) and/or a table of surface charge densities (P, t) of a given heart chamber can be generated.

Physiological monitoring can be provided through an actigraphy sensor imbedded into an electrocardiography monitor, which correlates movement and electrocardiographic data. Physiological monitoring can be provided through a wearable monitor that includes two components, a flexible extended wear electrode patch and a removable reusable monitor recorder. The wearable monitor sits centrally on the patient's chest along the sternum. The patient can place an electrode patch anywhere within the general region of the sternum. The occurrence of actigraphy events are monitored by the monitor recorder through an actigraphy sensor. Actigraphy becomes a recordable actigraphy event occurrence when the movement of the wearable monitor and, therefore, the patient, exceeds a certain criteria threshold of acceleration or deceleration as detected by the actigraphy sensor. Certain actigraphy event occurrences as recorded by the monitor recorder are considered to be actionable, that is, of sufficient importance to warrant flagging for further consideration to a following physician.

Systems, methods and devices for reducing noise in cardiac monitoring including wearable monitoring devices having at least one electrode for cardiac monitoring; in some implementations, the wearable device using a composite adhesive having at least one conductive portion applied adjacent the electrode; and, in some implementations, including circuitry adaptations for the at least one electrode to act as a proxy driven right leg electrode.