A health care system acquires data determines whether a patient is at risk of hypervolemia or hypovolemia. The method comprises (a) acquiring from a device memory a patient's absolute intrathoracic impedance data over a pre-specified time period, (b) determining a running average of the intrathoracic impedance data over the pre-specified time period, and (c) determining by the system whether the running average of the intrathoracic impedance data over the pre-specified time period exceeds one of a first and second range, the first range being a higher value boundary of intrathoracic electrical impedance and the second range being a lower value boundary of intrathoracic electrical impedance.

The present technology relates to intracardiac sensors and associated systems and methods. In some embodiments, the present technology includes a device for monitoring pressure within a patient's heart. The device can include an implantable capacitor having a capacitance value that is variable based on the pressure within the patients heart and a sensing circuit configured to measure the capacitance value. The device can also include an implantable inductor and a power circuit configured to wirelessly receive power from an external source via the inductor. When the device is in a first configuration, the capacitor can be electrically coupled to the sensing circuit and the inductor can be electrically coupled to the power circuit. When the device is in a second configuration, the capacitor can be electrically coupled to the inductor to form a resonant circuit.

Techniques are disclosed for explaining and visualizing an output of a machine learning system that detects cardiac arrhythmia in a patient. In one example, a computing device receives cardiac electrogram data sensed by a medical device. The computing device applies a machine learning model, trained using cardiac electrogram data for a plurality of patients, to the received cardiac electrogram data to determine, based on the machine learning model, that an episode of arrhythmia has occurred in the patient and a level of confidence in the determination that the episode of arrhythmia has occurred in the patient. In response to determining that the level of confidence is greater than a predetermined threshold, the computing device displays, to a user, a portion of the cardiac electrogram data, an indication that the episode of arrhythmia has occurred, and an indication of the level of confidence that the episode of arrhythmia has occurred.

A method includes detecting, by an implantable medical device (IMD), attachment to the IMD of at least one implantable medical lead with at least one electrode; and triggering by the IMD, based on the detecting of the attachment to the IMD of the at least one medical lead, a device test sequence in which the IMD performs the following qualification tests over an evaluation period: detecting an impedance for at least one electrical path that includes the at least one electrode to determine a connection status of the IMD to the at least one electrode; and comparing EGM (electrogram) amplitudes of the patient over an EGM test period against a predetermined threshold.

A medical device is configured to deliver anti-tachycardia pacing (ATP) in the presence of T-wave alternans. The device is configured to detect a ventricular tachyarrhythmia from a cardiac electrical signal received by the medical device. In response to the detected ventricular tachyarrhythmia, the device delivers a plurality of ATP pulses at alternating time intervals. The alternating time intervals comprise at least a first ATP time interval separating a first pair of the ATP pulses and a second ATP time interval different than the first ATP time interval. The second ATP time interval consecutively follows the first ATP time interval and separates a second pair of the ATP pulses.

A medical device includes: a case at least a portion of which functions as a first electrode; a second electrode disposed in a header coupled to the case; a core assembly, the core assembly including operational circuitry enclosed within a core assembly housing, wherein the case includes the core assembly housing; and a battery assembly, the battery assembly including a battery enclosed within a battery housing, where the case further comprises the battery housing; where the operational circuitry is configured to drive a regulated voltage onto the case.

Systems and methods are provided for reducing stimulation interference between two stimulation modules positioned on a user's body, which may be used in stimulation systems without a central treatment controller. Systems and methods are also provided for stimulation treatment using multiple independent stimulators wirelessly managed by a remote management device.

This document describes methods and materials for reducing incision sizes for improving the treatment of pathological conditions, including arrhythmias and trauma, using temperature modulation via implantable devices. For example, this document describes methods and devices for treating atrial and/or ventricular fibrillation by cooling the epicardium.

Intraprocedural techniques for identifying a location of an origin of an idiopathic ventricular arrhythmia in a patient are presented. The techniques include acquiring an at least partial electroanatomical geometry; acquiring an electrocardiogram segment of the idiopathic ventricular arrhythmia; calculating at least one integral of the electrocardiogram segment; acquiring a plurality of pacing site sets of coordinates; acquiring a plurality of pacing electrocardiogram segments of the patient; calculating at least one pacing integral; relating each pacing site set of coordinates to at least one corresponding pacing integral, such that a plurality of coefficients are obtained; determining an estimated set of coordinates of the origin of the idiopathic ventricular arrhythmia based on at least one integral of the electrocardiogram segment and on the plurality of coefficients; projecting the estimated set of coordinates of the origin on to the at least partial electroanatomical geometry to obtain a map; and providing the map.

Systems and methods may monitor electrical activity of a patient's heart using electrodes during delivery of cardiac conduction system pacing therapy, generate electrical heterogeneity information (EHI) based on the monitored electrical activity during delivery of cardiac conduction system pacing therapy, and determine whether the cardiac conduction system pacing therapy would benefit from supplemental cardiac pacing therapy based on the generated EHI.