Abstract: System and method for contactless vascular flow measurement are provided. Herein, a measurement circuit emits a radio frequency (RF) waveform toward a human peripheral body part and measures micro-vessel motion in an area of interest of the human peripheral body part based on reflections of the RF waveform. Accordingly, the measurement circuit can extrapolate vascular flow information in the human peripheral body part based on the measured micro-vessel motion. In a non-limiting example, the measurement circuit can detect inner organ vibrations to measure pulse rate, strength, and/or pressure caused by radial arterial blood flow changes at the human peripheral body part. By detecting and measuring the vascular flow via the RF waveform, the vascular flow measurement system provides a non-invasive approach to detect and/or prevent peripheral artery diseases. Further, the measurement circuit emits a very low power, non-ionizing RF waveform to help minimize potential health risks to a human body.

Abstract: Imaging systems and imaging methods are described. According to one aspect, an imaging system includes processing circuitry configured to access radar data resulting from reflection of electromagnetic energy from a target imaging volume, first focus the radar data to provide first focused data for at least substantially an entirety of the target imaging volume, use the first focused data to identify a sub-volume of the target imaging volume, and second focus the radar data to provide second focused data for the sub-volume of the target imaging volume, and wherein the second focused data has increased resolution compared with the first focused data and the second focused data comprises an image of the target imaging volume.

Abstract: A medical needle assembly includes a stylet having non-circular cross-sectional shape disposed within the needle lumen. The needle and the stylet each define respective electrodes that enable ascertainment of an electrical property of a body substance adjacent the distal tip of the needle. An electrically insulative coating having a uniform thickness covers the stylet. Wire leads enable connection of the electrodes to a measurement module configured to measure an electrical property of a body substance adjacent a distal end of the needle during insertion. Electrical property measurement enables identification of the location of the needle tip within the patient based on the measurement value. A major diameter of the non-circular cross-sectional shape extends across the needle lumen to create first and second flow paths extending along the lumen on opposite sides of non-circular cross-sectional shape. The first and second flow paths enable blood to flow along the lumen during use.

Abstract: Described herein are techniques to determine whether an image that would result from a magnetic resonance imaging (MRI) scan would satisfy quality metrics, such as by being of sufficient quality to permit a diagnostic read of the image. The determination may be based on signals emitted and captured by an MRI system during the MRI scan, permitting an automated determination of quality of an image that would result from an MRI scan. Some such techniques may be performed during the MRI scan, before the completion of the MRI scan, or after the MRI scan before or after magnetic resonance data (MR data) resulting from the MRI scan has been processed to generate an image from the MR data.

Abstract: An oxygen sensing system includes a coupling loop that connects to an electron paramagnetic resonance (EPR) bridge. The oxygen sensing system also includes a cable connected to the coupling loop, where the cable acts as a transmission line. The oxygen sensing system further includes a plurality of oxygen sensors formed on the cable, where each of the oxygen sensors comprises a multi-turn coil.

Abstract: Methods of categorisation of schizophrenia sufferers into subtypes based on changes in brain morphology, together with associated blood biomarkers are provided. The methods allow for more accurate treatment and diagnosis of schizophrenia.

Abstract: The present invention relates to a device, system and method for determining a respiration rate of a subject.

Abstract: In a preferred embodiment, there is provided a method for determining a breathing pattern, the method comprising: placing a motion sensor and a flex sensor proximate to a diaphragm of a subject; obtaining time domain signals or data from both said sensors over a time period; subjecting the time domain signals or data from the motion sensor to Fast Fourier transformation to obtain frequency domain signals or data, and determining from the frequency domain signals or data one or more frequencies associated with body motion of the subject substantially unrelated to breathing; and filtering the time domain signals or data from the flex sensor to remove information related to the body motion therefrom to obtain filtered time domain signals or data.

Abstract: Respiratory rate can be calculated from an acoustic input signal using time domain and frequency domain techniques. Confidence in the calculated respiratory rate can also be calculated using time domain and frequency domain techniques. Overall respiratory rate and confidence values can be obtained from the time and frequency domain calculations. The overall respiratory rate and confidence values can be output for presentation to a clinician.

Abstract: The present disclosure is directed to methods and systems that analyze one or more analytes in a fluid, such as breath, emitted from a user. The methods and systems can detect one or more analytes in the breath of a user to provide alerts in response to discrepancies in medications taken by a user, verify one or more medications taken by a user, manage a medication regime of a user, and various other functions disclosed herein.

Abstract: The present disclosure relates to a congestive heart failure biomarker detector. The congestive heart failure biomarker detector includes a gas sampling unit adapted to collect a gas sample for evaluating congestive heart failure. The congestive heart failure biomarker detector includes a chemical isolation unit adapted to selectively isolate a biomarker of interest from the gas sample to a predetermined level of accuracy. The congestive heart failure biomarker detector includes a processing unit configured to determine a level of the isolated biomarker of interest. The congestive heart failure biomarker detector includes a display unit configure to display the determined level of the isolated biomarker of interest.

Abstract: Described here are systems and methods for monitoring airflow changes in a patient's airway during a medical procedure or as a general patient monitoring tool. Doppler ultrasound signals are acquired from an anatomical region within the patient's airway (e.g., a tracheal wall, a cricothyroid ligament, other connective or cartilaginous tissue within the trachea, larynx, or pharynx) and parameters from those Doppler ultrasound signals are compared to baseline parameters, which may include inputting Doppler ultrasound signals to a suitably trained deep learning model or other machine learning algorithm. When a threshold change is detected, an alarm can be provided to a user to indicate respiratory compromise and/or failure, which can include early airway compromise, airway failure, and/or airway obstruction.

Abstract: Described here are systems and methods for monitoring airflow changes in a patient's airway during a medical procedure or as a general patient monitoring tool. Doppler ultrasound signals are acquired from the tracheal wall of the patient and parameters from those Doppler ultrasound signals are compared to baseline parameters. When a threshold change is detected, an alarm can be provided to a user to indicate respiratory compromise, which can include early airway compromise or airway obstruction.

Abstract: A chemical extraction apparatus has absorbent material for absorbing or adsorbing volatile chemicals from a breath of a user. The chemical extraction apparatus is positioned within such that breaths from the user flow over the absorbent material thereby causing volatile chemicals in the breaths to absorb or adsorb into the absorbent material. The absorbent material is then analyzed to determine the amount of chemicals absorbed or adsorbed into the absorbent material. Based on such analysis, various diseases or conditions can be detected or diagnosed.

Abstract: A protected sample collection media for use in a sample collection device includes a piece of porous sample collection media having a first major side and an opposing second major side; and a protective sheath fully covering the first major side and the second major side. The protective sheath has a first portion and a second portion. The first portion is removable without removing the second portion. The second portion forms a tab constructed to be gripped by hand. The protected sample collection media may be part of a system including a sample collection device. The system may be provided as a kit including instructions for use of the kit.

Abstract: A sample collection device includes a housing including an exhalation portion and a coupling portion. The coupling portion can be coupled with/to a sample collection tube. An airflow path extends through the housing. The device further includes porous sample collection media partially disposed between within the housing and arranged to occlude the airflow path. The porous sample collection includes nonwoven material and may include polylactic acid, polypropylene, or a combination thereof. The housing can be a single piece, part, or component, or can be multiple pieces, parts, components, or portions. In an embodiment of a two-piece housing, the first part includes an exhalation piece (e.g., a mouthpiece or nosepiece) and the second part includes a coupling end constructed for coupling with a sample collection tube.

Abstract: Systems, devices, and methods for providing procedure-specific workflow guidance are provided. The workflow guidance may include providing selectable options on a display device to a user including a selectable option to select a target vessel and a prompt to move an intravascular imaging device within the selected target vessel. Imaging data is received from the intravascular imaging device within the selected target vessel. The workflow guidance may be used to identify an area of interest within the selected target vessel and automatically display vessel measurements corresponding with the area of interest on the display device.

Abstract: A patient monitor for monitoring a patient's orientation to minimize health risks can include one or more hardware processors that can receive and process data from a sensor to determine the patient's orientation. The one or more hardware processors can maintain a plurality of timers associated with available orientations of the patient. Each of the plurality of timers can account for a duration of time said patient is in an associated available orientation. The patient monitor can include a structured display illustrating a current orientation of the patient, a heat map that graphically illustrates said durations of time and/or an orientation graph that displays the patient' orientation history.

Abstract: A system is described for determining, for a bipedal object (1) such as a human being or a robot, a fall risk measure that represents a risk for the bipedal object (1) to fall when walking. Acceleration value samples and angular velocity value samples associated with movement of a leg (2) of the bipedal object (1) are obtained and processed. Characterizing feature values are determined and used in determining the fall risk measure.

Abstract: A caregiver assistance system is disclosed for helping caregivers manage the care of existing bed sores and/or reduce the risk of a patient developing bed sores. The system may also help the caregiver to perform rounding tasks and/or to reduce the likelihood of patient falls. The system comprises a server application in communication with the patient's bed and one or more mobile electronic devices (e.g. smart phones). The mobile devices receive individual assessments of a plurality of bed sore risk factors and forward them to the server. The server generates bed sore risk scores from the answers and forward them to an EMR server. The server may also determine one or more risk reduction steps, display them on the mobile electronic device, and/or forward them to the patients' beds for implementation thereon. Additional bed sore information may be captured and sent to the EMR.

Abstract: A sensor (e.g., an optical sensor) that may be implanted within a living animal (e.g., a human) and may be used to measure an analyte (e.g., glucose or oxygen) in a medium (e.g., interstitial fluid, blood, or intraperitoneal fluid) within the animal. The sensor may include a sensor housing, an analyte indicator covering at least a portion of the sensor housing, and one or more compounds having metal chelating moieties that reduce degradation of the analyte indicator.

Abstract: A method for performing an assay to determine the presence or concentration of an analyte contained in a sample of body fluid by using a device comprising at least one analyte quantification member and a sensor associated therewith, the method includes: applying a first sample to the analyte quantification member; and detecting the presence or absence of an adequate sample volume; wherein upon detection of the absence of an adequate sample volume, initiating a finite timed period, and signaling the user to introduce a second sample of body fluid to the analyte quantification member. Associated arrangements and devices are also disclosed.

Abstract: A glucose sensor includes a working electrode, sensor electronics configured to periodically measure electrode current signal (Isig) values for the working electrode and counter voltage values (Vcntr) for the glucose sensor, one or more processors, and one or more processor-readable media. The one or more processor-readable media stores instructions which, when executed by the one or more processors, cause performance of: generating Electrochemical Impedance Spectroscopy (EIS) parameter values for the working electrode based on an EIS procedure; estimating a reaction surface area of the glucose sensor based on least one of Isig values, Vcntr values, or the EIS parameter values; determining a difference between the estimated reaction surface area and an expected reaction surface area of the glucose sensor; comparing the determined difference to a predetermined threshold value; and adjusting a calibration factor when the determined difference is below the predetermined threshold value.

Abstract: The current subject matter is directed to an ecosystem that enables interconnection of a blood glucose monitor and a continuous glucose monitor for data exchange and processing of shared data. The communication of data and instructions enables user-facing functionality and feedback to a user. The connection between the blood glucose monitor and the continuous glucose monitor may also provide for improved functionality of either or both devices. For example, measurements may be used for calibration or verification processes. Data streams from other data sources may be correlated or integrated with the data obtained by the blood glucose monitor and/or the continuous glucose monitor. The correlation or the integration of other data streams may be used to provide additional alerts or functionality to the user. Aspects of the current subject matter are also directed to integration of blood glucose monitor and continuous glucose monitor functionalities in one device or structure.

Abstract: The present examples relate generally to patch applicators for medical devices. The medical devices may comprise a transcutaneous analyte sensor applied to the skin of a host. The apparatuses, systems, and methods disclosed may be directed to an applicator for an overlay patch for being applied to at least a portion of an on skin medical device.

Abstract: Systems, devices and methods for assisting users in locating sources of carb-related food items. A hypoglycemic event is detected via a blood glucose monitoring device and a location of a user's mobile device is detected during the hypoglycemic event. In response to the location of the mobile device being at the user's home, carb-related food items in a refrigerator or carb-related food items purchased within a predefined period of time are displayed on the mobile device. In response to the location of the mobile device being outside of the user's home, locations of a predefined source of carbohydrates outside of the home are displayed on the mobile device.

Abstract: Embodiments of the present disclosure include a method for receiving sensor data indicative of a glucose level from a glucose sensor configured to be positioned in contact with a bodily fluid under a skin surface of a subject, receiving, from a temperature sensor, temperature data indicative of a temperature of the skin surface, determining a rate of change of the glucose level, wherein the rate of change indicates a presence of a hypoglycemic condition, determining that a variation of the temperature of the skin surface is within a predetermined range of temperature values, and determining, in response to the variation of the temperature data, that the rate of change of the glucose level corresponds to a sensor signal attenuation.

Abstract: A micro analyte sensor includes a base that includes an internal part and an internal part. At least one electrode group is located on the surface of the internal part, and each electrode group includes at least one working electrode and at least one additional electrode. The internal part is provided with a pad corresponding to each electrode, and the pad is electrically connected with the working electrode and the additional electrode respectively through a wire. At least one surface of the electronic conduction layer of the working electrode and/or the additional electrode is provided with a micro structure to increase the surface area and roughness of the electronic conduction layer, enhance the adhesion force of the electrode and improve the detection reliability of the sensor.

Abstract: Through a correction value calculation operation, a specific pigment concentration is calculated from each of respective image signals corresponding to a first wavelength range having sensitivity to blood hemoglobin, a second wavelength range different in sensitivity to a specific pigment from the first wavelength range and different in sensitivity to blood hemoglobin from the first wavelength range, a third wavelength range having sensitivity to blood concentration, and a fourth wavelength range having a longer wavelength than the first to third wavelength ranges, and is stored. A representative value is set from a plurality of specific pigment concentrations, an oxygen saturation corrected for the specific pigment is calculated, and an image display is performed using the oxygen saturation.

Abstract: An oximeter probe is user configurable for being in an absolute reporting mode and a relative reporting mode for measured values. The measured values for the absolute and relative modes include absolute oxygen saturation, relative oxygen saturation, absolute hemoglobin content, relative hemoglobin content, absolute blood volume, relative blood volume. The relative modes and absolute modes for determining and reporting relative or absolute hemoglobin content or relative or absolute blood volume for individual patients are beneficial when determining the efficacy of administered medications, such as epinephrine, that effect blood flow, but not oxygen saturation, in tissue, such as skin. The oximeter probe in these relative modes displays the efficacy of the administered medication as reported values for relative hemoglobin content or relative blood volume fall or rise.

Abstract: Medical devices and methods are disclosed for detecting an analyte in a body fluid. The medical device comprises an analyte sensor having an insertable portion adapted for insertion into body tissue of a user. An insertion cannula receives the analyte sensor therein. A housing forms a sealed sensor compartment receiving an insertable portion of the analyte sensor. The sealed sensor compartment comprises a detachable upper cap and a detachable lower cap. The detachable lower cap is configured for detachment before sensor insertion. The cannula is attached to the detachable upper cap, wherein the detachable upper cap is configured for detachment after insertion, thereby removing the insertion cannula.

Abstract: A conductive substrate for a working electrode for a biological sensor includes a plastic substrate comprising an organic polymer or a thermoplastic. A carbon compound is on the plastic substrate. The carbon compound includes an elastomeric material and a carbon material from an aqueous solution. The carbon compound includes at least two materials from a group of carbon black, graphene, pyrolytic carbon, pyrolytic graphite, and diamagnetic graphite. The conductive substrate receives and transfers free electrons generated by an enzyme in the working electrode.

Abstract: Systems and methods are disclosed which provide for a “factory-calibrated” sensor. In doing so, the systems and methods include predictive prospective modeling of sensor behavior, and also include predictive modeling of physiology. With these two correction factors, a consistent determination of sensitivity can be achieved, thus achieving factory calibration.

Abstract: The present disclosure provides a calibration system and method for calibrating a physiological measurement based on a variable that affects the measurement. The variable can be a related physiological measurement. The technique can be implemented to obtain robust calibrations with minimal test data and computational effort.

Abstract: A shieldable needle device with a needle cannula, a hub supporting the needle cannula, and a tip guard axially movable along the needle cannula where, upon transition, the tip guard protectively surrounds the distal end of the needle cannula. The needle device includes a pair of wings extending laterally from opposing sides of the tip guard and connected to the hub. The pair of wings are transitionable between a first position and a second position, wherein transition of the pair of wings advances the tip guard from a proximal position to a shielding distal position. The wings include protrusions which cause the longitudinal axis of the needle cannula to become offset from the opening of the tip guard during advancement of the tip guard preventing the needle cannula from being reinserted through the tip guard after the tip guard has been transitioned to the distal position.

Abstract: Systems and methods are provided for collecting eye-gaze data for training an eye-gaze prediction model. The collecting includes selecting a scan path passing through a series of regions of a grid on a screen of a computing device, moving a symbol as an eye-gaze target along the scan path, and receiving facial images at eye-gaze points. The eye-gaze points are uniformly distributed within the respective regions. Areas of the regions that are adjacent to edges and corners of the screen are smaller than other regions. The difference in areas shifts centers of the regions toward the edges, density of data closer to the edges. The scan path passes through locations in proximity to the edges and corners of the screen for capturing more eye-gaze points in the proximity. The methods interactively enhance variations of facial images by displaying instructions to the user to make specific actions associated with the face.

Abstract: A feature quantity based on the strength of a correlation between each of a plurality of different visual stimulus patterns corresponding to a plurality of different sound sources and a pupil diameter change amount of a user is obtained, and a destination to which the user pays auditory attention for a sound from the sound source is estimated using the feature quantity.

Abstract: The present specification discloses an intraoperative neurophysiological monitoring (IONM) system including a computing device capable of executing an IONM software engine, a stimulation module having multiple ports and various stimulation components and recording electrodes. The system is used to implement transcranial electrical stimulation and motor evoked potential monitoring by positioning at least one recording electrode on a patient, connecting the stimulation components to at least one port on the stimulation module, positioning the stimulation components on a patient's head, activating, using the IONM software engine, at least one port, delivering stimulation to the patient; and recording a stimulatory response on the patient.

Abstract: Sense amplifier circuits particularly useful in sensing neural responses in an Implantable Pulse Generator (IPG) are disclosed. The IPG includes a plurality of electrodes, with one selected as a sensing electrode and another selected as a reference to differentially sense the neural response in a manner that subtracts a common mode voltage (e.g., stimulation artifact) from the measurement. The circuits include a differential amplifier which receives the selected electrodes at its inputs, and comparator circuitries to assess each differential amplifier input to determine whether it is of a magnitude that is consistent with the differential amplifier's input requirements. Based on these determinations, an enable signal is generated which informs whether the output of the differential amplifier validly provides the neural response at any point in time.

Abstract: This invention is a head-worn device (e.g. headband, halo, or headset) with sensors (e.g. electrodes) which record brain activity. In an example, the device can be undulating with concave undulations which rest on the tops of a person's ears. In an example, the device can further comprise right side and left side ear prongs (e.g. arms, segments, or portions) which curve around the posterior and upper surfaces of a person's right and left ears.

Abstract: A flexible electronic device includes a first encapsulation layer and a sensing structure. The sensing structure is disposed on the first encapsulation layer and includes a substrate, a plurality of first sensing layer, a plurality of second sensing layer, a first groove and a second groove. The substrate includes a main body, a plurality of first branches and a plurality of second branches. The main body has a first side and a second side opposite to each other. The first branches connect the first side. The second branches connect the second side. The first sensing layers are disposed on the first branches. The second sensing layers are disposed on the second branches. The first groove is disposed between the first branches. The second groove is disposed between the second branches.

Abstract: The present invention is a bio-electrode, including: a living-body contact layer; and a substrate, wherein the living-body contact layer has a micropillar having a diameter within a range of 0.01 to 500 ?m and a height within a range of 0.1 to 1,000 ?m, and has an ionic polymer (A) as a material, and the component (A) has a repeating unit-a of one or more selected from a fluorosulfonic acid, a fluorosulfonimide, and a fluorosulfonamide, and has a weight-average molecular weight within a range of 1,000 to 500,000. This provides: a bio-electrode that is a thin film and highly transparent, that has high sensitivity to a bio-signal, excellent bio-compatibility, and a lightweight property, that can be manufactured at a low cost, that does not considerably deteriorate the sensitivity to the bio-signal even when being wet, dried, or attached to skin for a long term, and that is comfortable and free from itching, red spots, rash, etc. of the skin; and a method for manufacturing a bio-electrode.

Abstract: Disclosed is a physiological signal acquisition device. The physiological signal acquisition device may include a first insulating membrane, first absorbent members, and at least two electrodes. At least two first guide grooves may be arranged in a first direction on the first insulating membrane, and the at least two first guide grooves may be insulated from each other. The first absorbent members may be arranged in the at least two first guide grooves and configured to absorb moisture. The at least two electrodes may be configured to contact a skin and acquire physiological signals, wherein the at least two electrodes may cover the at least two first guide grooves and may be attached to surfaces of the first absorbent members near the skin.

Abstract: The system and method provide for electrocardiogram analysis and optimization of patient-customized cardiopulmonary resuscitation and therapy delivery. An external medical device includes a housing and a processor within the housing. The processor can be configured to receive an input signal for a patient receiving chest compressions and to select at least one filter mechanism and to apply the filter mechanism to the signal to at least substantially remove chest compression artifacts from the signal. A real time dynamic analysis of a cardiac rhythm is applied to adjust and integrate CPR prompting of a medical device. Real-time cardiac rhythm quality is facilitated using a rhythm assessment meter.

Abstract: A system (400) for monitoring a physiological parameter of a patient including a wireless signal unit (60, 500) having a transceiver (515) configured to transmit, by a communication link (CL), wireless data associated with the physiological parameter of the patient at a default transfer rate; a patient monitor (70) configured to receive the wireless data transmitted from the transceiver at the default transfer rate; and a processor (64, 505, 535) communicably coupled with the wireless signal unit. The processor is configured to: (i) receive and preprocess (650) an input signal comprising a signal corresponding to the physiological parameter of the patient and transient gradient signals from a gradient system; (ii) determine (650) a gradient signal activity value of the gradient system; and (iii) dynamically adjust (670) the default transfer rate of the wireless data transmitted from the transceiver to an adjusted transfer rate based on the gradient signal activity value.

Abstract: An animated electrophysiology map is generated from a plurality of data points, each including measured electrophysiology information, location information, and timing information. The electrophysiology and location information can be used to generate the electrophysiology map, such as a local activation time, peak-to-peak voltage, or fractionation map. Animated timing markers can be superimposed upon the electrophysiology map using the electrophysiology, location, and timing information. For example a series of frames can be displayed sequentially, each including a static image of the electrophysiology map at a point in time and timing markers corresponding to the state or position of an activation wavefront at the point in time superimposed thereon. The visibility or opacity of the timing markers can be adjusted from frame to frame, dependent upon a distance between the timing marker and the activation wavefront, to give the illusion that the timing markers are moving along the electrophysiology map.

Abstract: A method for determining cardiac tissue health based on a depolarization wave within an EGM is disclosed. The method includes computing a first derivative with respect to time (DV/DT) of the EGM, determining extrema for the first derivative, establishing a value DV/DTMIN based on the extrema and mapping the value DV/DTMIN to cardiac tissue.

Abstract: A method for screening for cardiac amyloidosis by electrocardiography is disclosed. The method includes receiving, using at least a processor, voltage-time data of a subject, wherein the voltage-time data comprises voltage data from a plurality of leads of an electrocardiograph. The method includes generating, using the at least a processor, a feature vector from the voltage-time data. The method includes identifying, using the at least a processor, the presence or absence of cardiac amyloidosis (CA) in the subject as a function of the feature vector using a learning system.

Abstract: Disclosed herein is a health condition prediction system using an asynchronous electrocardiogram, including: a single-lead electrocardiogram measurement unit provided with two electrodes, and configured to obtain asynchronous electrocardiogram data by measuring electrocardiograms for at least two electrical axes at different times; and a prediction unit configured to predict the presence/absence of a disease and the degree of the disease from the asynchronous electrocardiogram data through a diagnostic algorithm previously constructed by being trained on a plurality of asynchronous segment standard lead electrocardiogram datasets in which asynchronous segment standard lead electrocardiograms at different times in an asynchronous standard lead electrocardiogram segmented into the specific time units from a synchronous standard lead electrocardiogram measured for the same electrical axis and accumulated in a medical institution server are matched to the presence/absence of a disease and degree of the disease co

Abstract: Described herein are methods, devices, and systems that monitor heart rate and/or for arrhythmic episodes based on sensed intervals that can include true R-R intervals as well as over-sensed R-R intervals. True R-R intervals are initially identified from an ordered list of the sensed intervals by comparing individual sensed intervals to a sum of an immediately preceding two intervals, and/or an immediately following two intervals. True R-R intervals are also identified by comparing sensed intervals to a mean or median of durations of sensed intervals already identified as true R-R intervals. Individual intervals in a remaining ordered list of sensed intervals (from which true R-R intervals have been removed) are classified as either a short interval or a long interval, and over-sensed R-R intervals are identified based on the results thereof. Such embodiments can be used, e.g., to reduce the reporting of and/or inappropriate responses to false positive tachycardia detections.