A diagnostic system includes an array of electrodes, which are coupled to a body surface of a living subject at different, respective positions in proximity to a region of interest within the body. A switched impedance network applies varying loads to the electrodes. A processor is coupled to receive and measure electrical signals from the electrodes as a function of the varying loads, and to analyze the measured signals so as to compute a local electrical characteristic of one or more locations within the region of interest.

Technologies and implementations for determining a respiration rate of a person from heart rate monitoring signal is disclosed.

Systems and methods for resolving catheter rendering issues are provided. A system includes a catheter including a plurality of electrodes and a plurality of catheter pins, each catheter pin corresponding to an associated electrode. The system further includes a mapping system communicatively coupled to the catheter, the mapping system including a pin box including a plurality of sockets, a display device configured to render the catheter, and an electronic control unit (ECU). The ECU is configured to determine that the catheter is being rendered incorrectly on the display device, determine a number of electrodes that are being rendered incorrectly on the display device, identify at least one particular electrode of the plurality of electrodes that is being rendered incorrectly on the display device, and attempt to resolve the incorrect rendering of the catheter based on the determined number of electrodes and the at least one particular electrode.

A wearable cardioverter defibrillator system includes a support structure that a patient can wear. The system also includes electrodes that contact the patient, and define two or more channels from which ECG signals are sensed. A processor may evaluate the channels by analyzing their respective ECG signals, to determine which contains less noise than the other(s). The analysis can be by extracting statistics from the ECG signals, optionally after first processing them, and then by comparing these statistics. These statistics may include tall peak counts, amplitudes of peaks compared to historical peak amplitudes, signal baseline shift, dwell time near a baseline, narrow peak counts, zero crossings counts, determined heart rates, and so on. Once the less noisy signal is identified, its channel can be followed preferentially or to the exclusion of other channels, for continuing monitoring and/or determining whether to shock the patient.

A method is disclosed comprising: performing a first scan of an organ using a set of electrodes in a catheter that are currently active; deactivating one or more of the electrodes in the set based on data that is collected as a result of the first scan; tuning the set by at least one of (i) deactivating one or more electrodes in the set that remain active after the deactivating, and (ii) activating one or more electrodes in the catheter that are inactive; performing a second scan of the organ using electrodes in the set that are currently active after the tuning is performed, and generating a map of the organ based on data collected as a result of the second scan; and outputting the map of the organ for presentation to a user.

A system for performing fluid level measurements on a biological subject, the system including at least one substrate including a plurality of microstructures configured to breach a stratum corneum of the subject, at least some microstructures including an electrode, a signal generator operatively connected to at least one microstructure to apply an electrical stimulatory signal to the at least one microstructure and at least one sensor operatively connected to at least one microstructure, the at least one sensor being configured to measure electrical response signals from at least one microstructure. The system also includes one or more electronic processing devices that determine measured response signals, the response signals being at least partially indicative of a bioimpedance and perform an analysis at least in part using the measured response signals to determine at least one indicator at least partially indicative of fluid levels in the subject.

A sensing unit includes a base, first electrodes, an insulating layer, second electrodes, and third electrodes. The first electrodes are arranged on the base, extend in a first direction, and are spaced apart from each other in a second direction different from the first direction. The first insulating layer is disposed on the first electrodes. The second electrodes are electrically insulated from the first electrodes by the insulating layer, extend in the second direction, and are spaced apart from each other in the first direction. The third electrodes are electrically insulated from the first electrodes by the insulating layer, extend in the second direction, and are electrically insulated from the second electrodes. The second electrodes and the third electrodes are alternately arranged in the first direction. The third electrodes may receive a driving signal or a sensing signal according to a sensing mode.

A signal measurement apparatus and signal measurement method are provided. The signal measurement apparatus includes an amplifier configured to receive a differential voltage signal, amplify the received differential voltage signal, and output the amplified differential voltage signal, a controller configured to output a control signal to control a switching circuit in response to a signal value of the amplified differential voltage signal satisfying a condition, and wherein the switching circuit is configured to change connections between input terminals of the amplifier and paths along which the differential voltage signal is transmitted, based on the control signal.

A wearable cardioverter defibrillator system includes a support structure that a patient can wear. The system also includes electrodes that contact the patient, and define two or more channels from which ECG signals are sensed. A processor may evaluate the channels by analyzing their respective ECG signals, to determine which contains less noise than the other(s). The analysis can be by extracting statistics from the ECG signals, optionally after first processing them, and then by comparing these statistics. These statistics may include tall peak counts, amplitudes of peaks compared to historical peak amplitudes, signal baseline shift, dwell time near a baseline, narrow peak counts, zero crossings counts, determined heart rates, and so on. Once the less noisy signal is identified, its channel can be followed preferentially or to the exclusion of other channels, for continuing monitoring and/or determining whether to shock the patient.

A wearable cardioverter defibrillator system includes a support structure that a patient can wear. The system also includes electrodes that contact the patient, and define two or more channels from which ECG signals are sensed. A processor may evaluate the channels by analyzing their respective ECG signals, to determine which contains less noise than the other(s). The analysis can be by extracting statistics from the ECG signals, optionally after first processing them, and then by comparing these statistics. These statistics may include tall peak counts, amplitudes of peaks compared to historical peak amplitudes, signal baseline shift, dwell time near a baseline, narrow peak counts, zero crossings counts, determined heart rates, and so on. Once the less noisy signal is identified, its channel can be followed preferentially or to the exclusion of other channels, for continuing monitoring and/or determining whether to shock the patient.