Abstract: This method for analyzing the cardiac activity of a patient are comprises the steps for acquiring (20) at least one cardiac said electric signal comprising at least one elementary signal corresponding to a heart beat, for extracting (29) from said elementary signal, at least one elementary wave, the general shape of which may be expressed by x(t)=x0+x1 cos(?(t)), wherein ?(t) is the phase of said elementary wave, and for analyzing (30) said elementary wave, comprising the steps for determining an expression of a phase equation F ? ( ? ) = ? ? ? t of said elementary wave and determining an expression of the phase ?(t) of said elementary wave as a functions of parameters measuring the anharmonicity of said elementary wave and its morphology, from p cosn and p sinn functions defined by: p ? ? cos n ? ( t , r ) = ? k = 1 ? ? cos ? ( kt ) ? r k k n ? ? and ? ? p ? ? sin n ? ( t , r ) = ? k = 1 ? ? sin ? ( kt ) ? r k k n .

Abstract: Electrodes and circuitry for monitoring and stimulating the exterior of the human body, comprising delivering stimulation pulses to stimulation electrodes applied to the exterior of the body, detecting an electrical potential at monitoring electrodes applied to the exterior of the body, positioning at least a first and second monitoring electrode at locations at which an electrical artifact caused by the electrical stimulation pulses is substantially cancelled in a signal formed from the electrical potentials detected at the first and second monitoring electrodes.

Abstract: A self-diagnostic system for an implantable cardiac device such as a pacemaker, cardioverter, or resynchronization device which utilizes a subcutaneous ECG channel is described. The subcutaneous ECG channel allows the device to, in real time and independent of the standard pacing and sensing circuitry, verify the presence of pacing spikes, chamber senses, and other device outputs and hence establish and verify device integrity.

Abstract: Techniques are provided for use by implantable medical devices such as pacemakers or by external systems in communication with such devices. An intracardiac electrogram (IEGM) is sensed within a patient in which the device is implanted using a cardiac signal sensing system. Cardiac events of interest such as arrhythmias, premature atrial contractions (PACs), premature ventricular contractions (PVCs) and pacemaker mediated tachycardias (PMTs) are detected within the patient using event detection systems and then portions of the IEGM representative of the events of interest are recorded in device memory. Subsequently, during an off-line or background analysis, the recorded IEGM data is retrieved and analyzed to identify false detections. In response to false detections, the cardiac signal sensing systems and/or the event detection systems of the implantable device are selectively adjusted or reprogrammed to reduce or eliminate any further false detections, including false-positives or false-negatives.

Abstract: A late potential detecting system has an implantable medical device connected to at least one cardiac lead having implantable electrodes positioned at different sites of a ventricle myocardium. A sampling unit of the implantable medical device records electrogram samples for the different implantable electrodes to get different sample sets. The electrogram samples of the sample sets are time synchronized and magnitude potential representations of the potential data of the electrogram samples are determined. The magnitude potential representations of the time synchronized electrogram samples are then co-processed and used for determining a parameter that is indicative of any late potentials of the monitored ventricle.

Abstract: An apparatus for determining a possibility of return of spontaneous circulation, includes: an electrocardiogram acquiring unit acquiring electrocardiogram waveform data from a subject in a cardiac arrest condition during chest compression applied to the subject; a bandpass filter unit allowing only a frequency component in a vicinity of a frequency of a P wave of the electrocardiogram waveform to pass through the bandpass filter unit; a resuscitation possibility determining unit determining whether an output of the bandpass filter unit exceeds a predetermined value or not, and determining that there is the possibility of return of spontaneous circulation when the output exceeds the predetermined value; and an outputting unit outputting a result of determination related to the possibility of return of spontaneous circulation.

Abstract: A method for operating an implantable medical device to obtain substantially synchronized closure of the mitral and tricuspid valves based on sensed heart sounds includes sensing an acoustic energy; producing signals indicative of heart sounds of the heart of the patient over predetermined periods of a cardiac cycle during successive cardiac cycles; calculating a pulse width of such a signal; and iteratively controlling a delivery of the ventricular pacing pulses based on calculated pulse widths of successive heart sound signals to identify an RV interval or VV interval that causes a substantially synchronized closure of the mitral and tricuspid valve. A medical device for optimizing an RV interval or VV interval based on sensed heart sounds implements such a method and a computer readable medium encoded with instructions causes a computer to perform such a method.

Abstract: Provided is a cardiac-event processor (1) including a storing unit (11) that stores a time history of cardiac events, including heartbeats, in association with the presence/absence of nerve stimulation; a heart rate calculator (12) that calculates a heart rate for when each heartbeat is detected, on the basis of the time history of the cardiac events stored in the storing unit (11); and a frequency data generator (13) that separately adds up frequencies of the heart rates calculated by the heart rate calculator (12) for the cases with and without the nerve stimulation.

Abstract: A method of detecting cardiac signals in a medical device that includes decomposing a cardiac signal using a wavelet function at a plurality of scales to form a corresponding wavelet transform, determining approximation coefficients in response to the plurality of scales, reconstructing a first wavelet representation of the wavelet transform using predetermined approximation coefficients of the determined approximation coefficients, and evaluating the detected cardiac signals in response to the reconstructing.

Abstract: A method for mapping abnormal electrical activity, including obtaining electrical signal data from respective locations in a heart of a living subject, and automatically analyzing the signal data to identify complex fractionated electrograms (CFEs) therein. The method further includes analyzing the CFEs so as to identify reentry locations comprised in the respective locations, and displaying information derived from the identification in relation to a map of the heart.

Abstract: An active medical device using non-linear filtering for the reconstruction of a surface electrocardiogram (ECG) from an endocardial electrogram (EGM) is disclosed. The device for the reconstruction of the surface ECG comprises: a plurality of inputs, receiving a corresponding plurality of EGM signals from endocardial or epicardial electrogram (x1[n], x2[n]), each collected on a respective EGM derivation of a plurality of EGM derivations, and at least one output delivering a reconstructed surface ECG electrocardiogram signal (y[n]), related to an ECG derivation, and a non-linear digital filter (12?, 12?, 14) with a transfer function that determines the reconstructed ECG signal based on said plurality of input EGM signals. The non-linear digital filter includes a Volterra filter type (12, 12?, 12?) whose transfer function includes a linear term (h1) and at least one quadratic (h2) and/or cubic (h3) term(s).

Abstract: Methods, systems, and devices for signal analysis in an implanted cardiac monitoring and treatment device such as an implantable cardioverter defibrillator. In illustrative examples, captured data including detected events is analyzed to identify likely overdetection of cardiac events. In some illustrative examples, when overdetection is identified, data may be modified to correct for overdetection, to reduce the impact of overdetection, or to ignore overdetected data. New methods for organizing the use of morphology and rate analysis in an overall architecture for rhythm classification and cardiac signal analysis are also discussed.

Abstract: Techniques are provided for use with an implantable medical device for evaluating mechanical cardiac dyssynchrony based impedance (Z) measured along different vectors between an electrode in the right ventricle (RV) and various electrodes of a multi-pole left ventricle (LV) lead.

Abstract: The invention provides a system for evaluating a patient featuring: 1) an ECG-measuring system connected to the patient and configured to sense ECG information from the patient; 2) a data-acquisition system interfaced to a vital sign-monitoring system configured to sense vital sign information from the patient during an electro-physiology (EP) procedure; and 3) an external software system interfaced to both systems. The external software system includes a first software interface that receives ECG information measured from the patient by the ECG-measuring system, and a second software interface that receives vital sign and EP-related information from the data-acquisition system measured from the patient during an EP procedure. A database stores physiological and EP-related information measured from the patient before, during, and after the EP procedure.

Abstract: Methods and systems are provided for discriminating heart arrhythmias. The methods and systems include identifying an arrhythmia, recording a predetermined number of beats during the arrhythmia as a base arrhythmia (BA) beats; delivering anti-tachy pacing (ATP) therapy to at least one chamber of the heart. After delivering the ATP therapy, the methods and system record at least one return beat representing cardiac activity following the ATP therapy, determines whether the return beat originated in a reference chamber of the heart, compares a morphology of the return beat to a morphology of the BA beat; and declares a VT or SVT based on the comparing operation.

Abstract: A cardiac analysis system is provided that includes an implantable medical device (IMD), at least one sensor, and an external device. The IMD has electrodes positioned proximate to a heart that sense first cardiac signals of the heart and associated with a clinical ventricular tachycardia (VT) event and second cardiac signals associated with an induced VT event. The sensor measures first and second cardiac parameters of the heart associated with the clinical and induced VT events, respectively. The external device is configured to receive the first and second cardiac signals associated with the clinical and the induced VT events and the first and second cardiac parameters associated with the clinical and the induced VT events. The external device compares the first and second cardiac signals and compares the first and second cardiac parameters to determine if the clinical and induced VT events are a common type of VT event.

Abstract: A medical device and associated method establish an occurrence of a premature atrial contraction. The device senses a ventricular signal. A control unit is configured to determine a metric of the ventricular signal during an interval following the premature atrial contraction and detect a change in cardiac stress tolerance in response to the determined metric.

Abstract: Systems and Methods for predicting patient health and patient relative well-being within a patient management system are disclosed. A preferred embodiment utilizes an implantable medical device comprising an analysis component and a sensing component further comprising a three-dimensional accelerometer, a transthoracic impedance sensor, a cardio-activity sensor, an oxygen saturation sensor and a blood glucose sensor. Some embodiments of a system disclosed herein also can be configured as an Advanced Patient Management System that helps better monitor, predict and manage chronic diseases.

Abstract: The present invention provides systems, methods and computer program products for monitoring a heart. According to one embodiment, the system includes an implantable registering unit. The registering unit comprises a first controller structured to register an electrical signal from the heart. The system includes a second controller in operable communication with the first controller. The second controller comprises a data repository structured to receive data corresponding to the registered electrical signal and being structured to store the data. The data repository stores data corresponding to a baseline electrical signal of the heart. The second controller is structured to receive the data from the first controller corresponding to the registered electrical signal and to compare the registered electrical signal to the baseline electrical signal to determine whether the heart is functioning properly.

Abstract: According to some embodiments, a wearable medical device capable of treating a patient presenting with syncope is provided. The wearable medical device includes a memory storing event profile information, a battery, at least one treatment electrode coupled to the battery, at least one processor coupled to the memory and the at least one treatment electrode, and an event manager executed by the at least one processor. The event manager is configured to detect an event associated with syncope; store, in the memory, data descriptive of the event in association with an indication that the data includes data descriptive of a syncopal event; and address the to event.

Abstract: Physiologic demand driven pacing can be used to maintain cardiac synchrony and improve hemodynamic function in patients with heart failure.

Abstract: A method includes retrieving electrogram (EGM) data for N cardiac cycles from a memory of an implantable medical device. N is an integer greater than 1. The method further include categorizing each of the N cardiac cycles into one of a plurality of categories based on a morphology of the N cardiac cycles and performing comparisons between pairs of the N cardiac cycles. Each of the comparisons between two cardiac cycles includes detecting a mismatch between the two cardiac cycles when the two cardiac cycles are in different categories, and detecting a match between the two cardiac cycles when the two cardiac cycles are in the same category. Additionally, the method includes classifying the rhythm of the N cardiac cycles based on a number of detected matches and detected mismatches.

Abstract: Techniques include determining a first vector of temporal changes in electrical data measured at multiple electrical sensors positioned at corresponding locations on a surface of a living body due to a natural electrical pulse. A different vector of temporal changes in electrical data measured at the same electrical sensors is determined due to each stimulated signal of multiple stimulated signals within the living body. Stimulated position data is received, which indicates a different corresponding position within the living body where each of the stimulated signals originates. The site of origin of the natural electrical pulse is determined based on the first vector and the multiple different vectors and the stimulated position data. Among other applications, these techniques allow the rapid, automatic determination of the site of origin of ventricular tachycardia arrhythmia (VT).

Abstract: Dual chamber pacemaker systems can lead to two forms of pacemaker-facilitated tachycardia—pacemaker-mediated tachycardia (PMT) and tracking of sinus or atrial tachycardia. Current pacemaker algorithms can not always differentiate between these two tachycardias. Various embodiments for differentiating these particular mechanisms of pacemaker-facilitated tachycardia, which is based on the specific termination response to PVARP extension are provided. The response to PVARP extension (V-A-A-V vs V-A-V) is a specific method for differentiation and can be used in conjunction with observations of atrial rate and electrogram morphology (or surface P wave morphology) for distinguishing between the two mechanisms of pacemaker-facilitated tachycardia.

Abstract: In a possible implementation, a method for cardiac testing is provided which includes measuring test data associated with cardiac events and storing the test data in an intracardiac stimulation device. The method further includes acquiring event electrograms corresponding with the test data and storing the event electrograms corresponding with the test data in the intracardiac stimulation device. In a possible implementation, marker data is stored associating event electrograms with measured test data, which may identify the event electrograms used for measuring the test data and/or identify when adjacent event electrograms are not contiguous. In some implementations, the test data may be measured and stored in an out-of-clinic test, and the test data and the corresponding event electrograms may be later retrieved from the intracardiac stimulation device and presented on a visual display.

Abstract: Systems and methods are provided for evaluating an expected effectiveness of cardiac resynchronization therapy. Electrocardiogram (ECG) data is received as at least one ECG lead from a set of electrodes. A frequency spectrum representing the ECG data is generated via a Fourier transform. At least one predictor value is extracted from the calculated frequency spectrum. A fitness parameter, representing the expected effectiveness of cardiac resynchronization, is determined from at least the extracted predictor value.

Abstract: Methods for determination of timing for electrical shocks to the heart to determine shock strength necessary to defibrillate a fibrillating heart. The timing corresponds the window of most vulnerability in the heart, which occurs during the T-wave of a heartbeat. Using a derivatized T-wave representation, the timing of most vulnerability is determined by a center of the area method, peak amplitude method, width method, or other similar methods. Devices are similarly disclosed embodying the methods of the present disclosure.

Abstract: In a possible implementation, a method for cardiac testing is provided which includes measuring test data associated with cardiac events and storing the test data in an intracardiac stimulation device. The method further includes acquiring event electrograms corresponding with the test data and storing the event electrograms corresponding with the test data in the intracardiac stimulation device. In a possible implementation, marker data is stored associating event electrograms with measured test data, which may identify the event electrograms used for measuring the test data and/or identify when adjacent event electrograms are not contiguous. In some implementations, the test data may be measured and stored in an out-of-clinic test, and the test data and the corresponding event electrograms may be later retrieved from the intracardiac stimulation device and presented on a visual display.

Abstract: A device and method of detecting the severity of myocardial ischemia and heart attack risk is provided. The method includes obtaining an electrogram signal, determining T-wave measurements based on the electrogram signal, and determining ST segment measurements based on the electrogram signal. The method also includes identifying T-wave alternans based on the T-wave measurements and identifying ST segment changes based on the ST segment measurements. The method further includes correlating the T-wave alternans with the ST segment changes in order to detect a severity of ischemia.

Abstract: In an example, a system includes a cardiac pulse generator configured to generate cardiac paces to pace the heart, a sensor configured to sense a physiological signal for use in detecting pace-induced phrenic nerve stimulation where the pace-induced phrenic nerve stimulation is phrenic nerve stimulation induced by electrical cardiac pace signals, and a phrenic nerve stimulation detector configured to analyze the sensed physiological signal to detect PS beats where the PS beats are cardiac paces that induce phrenic nerve stimulation. The detector may be configured to correlate signal data for sensed beat signals to a PS template to detect PS beats, or may be configured to analyze morphological features of sensed beat signals to detect PS beats, or may be configured to detect PS beats using a combination that both correlates signal data for sensed beat signals to a PS template and analyzes morphological features of sensed beat signals.

Abstract: Some method examples may include pacing a heart with cardiac paces, sensing a physiological signal for use in detecting pace-induced phrenic nerve stimulation, performing a baseline level determination process to identify a baseline level for the sensed physiological signal, and detecting pace-induced phrenic nerve stimulation using the sensed physiological signal and the calculated baseline level. Detecting pace-induced phrenic nerve stimulation may include sampling the sensed physiological signal during each of a plurality of cardiac cycles to provide sampled signals and calculating the baseline level for the physiological signal using the sampled signals. Sampling the sensed physiological signal may include sampling the signal during a time window defined using a pace time with each of the cardiac cycles to avoid cardiac components and phrenic nerve stimulation components in the sampled signal.

Abstract: Methods, systems and devices efficiently identify cardiac resynchronization therapy (CRT) pacing parameter set(s) that provide improved hemodynamic response relative to an initial CRT pacing parameter set, wherein each CRT pacing parameter set includes at least two CRT pacing parameters. User input(s) are accepted that specify a maximum amount of time and/or parameter sets that can be used to perform testing, and specify relative importance of parameters within the sets. Based on the accepted user input(s), there is a determination of how many different variations of each of the CRT pacing parameters can be tested, and based on this determination different CRT pacing parameter sets are selected and tested to obtain a hemodynamic response measure corresponding to each of the different sets tested. Additionally, one or more of the tested CRT pacing parameter sets, if any, that provide improved hemodynamic response relative to the initial CRT pacing parameter set is/are identified.

Abstract: A system and method for correlating health related data for display. The system includes a medical device recording data and a display producing device which correlates the data and simultaneously displays different types of data or displays two sets of the same type of data along with the circumstances at which the two sets of data were recorded. Such displays aid a physician in prescribing and ascertaining the efficacy of cardiac therapies.

Abstract: Cardiac arrhythmias are classified based on the morphology of the arrhythmia episode beats. Templates are formed using morphological features of the cardiac beats of the episode. The arrhythmia episode is classified as a monomorphic tachyarrhythmia or polymorphic tachyarrhythmia based on the one or more templates. The arrhythmia episode may be classified based on a number templates formed from the arrhythmia episode. The templates are formed by determining a measure of similarity between morphological features of a cardiac beat to a template. The similarities can be determined based on a pairing rule that determines which beat morphologies are compared. Selection of therapy for treating the arrhythmia episode may depend on the historical success of a therapy at mitigating previous arrhythmias of the same type as the arrhythmia episode.

Abstract: A method of locating a tip of a central venous catheter (“CVC”) having a distal and proximal pair of electrodes disposed within the superior vena cava, right atrium, and/or right ventricle. The method includes obtaining a distal and proximal electrical signal from the distal and proximal pair of electrodes and using those signals to generate a distal and proximal P wave, respectively. A deflection value is determined for each of the P waves. A ratio of the deflection values is then used to determine a location of the tip of the CVC. Optionally, the CVC may include a reference pair of electrodes disposed within the superior vena cava from which a reference deflection value may be obtained. A ratio of one of the other deflection values to the reference deflection value may be used to determine the location of the tip of the CVC.

Abstract: A sensing apparatus for sensing an object includes an arrangement of sensing elements for sensing a property of the object. The sensing elements are operable in a contact mode, in which a sensing is performable, while the sensing elements are in contact with the object, and in a non-contact mode, in which a sensing is performable, while the sensing elements are not in contact with the object. The sensing apparatus further includes a mode determination unit for determining whether or not a sensing element is in contact with the object.

Abstract: Systems, devices, structures, and methods are provided to present a visual display based on data from an implantable medical device. The display includes a chart showing the frequency of a detected type of arrhythmia over a predetermined period of time.

Abstract: A system and method for performing independent, off-line evaluation of event sensing for collected electrograms, comprising: sensing an electrogram using an implantable medical device (IMD); determining locations of heart beats on at least one channel of the electrogram using a multi-pass process, resulting in a group of multi-pass beat locations; storing the electrogram and device-identified beat locations in a memory location; and retrieving the electrogram and device-identified beat locations from the memory location. The multi-pass process determines locations of heart beats on at least a first channel of the electrogram. The device-identified group of beat locations are then compared to the multi-pass group of beat locations identified using the multi-pass method. Based on the comparing step, oversensing of beats, undersensing of beats, or noise from the device can be detected.

Abstract: A device for detecting cardiac ischemia is disclosed. The device includes a processor that is configured to operate in three different modes according to relative frequency of different beat types. If beats of a first beat type, such as ventricularly paced beats, are predominant, the processor ignores other beat types and performs ischemia detection only on ventricularly paced beats. Conversely, if beats of a second beat type, such as sinus or atrially paced beats, are predominant, the processor ignores ventricularly paced beats and performs ischemia detection only on sinus or atrially paced beats. If there is a mixture of beat types such that neither predominates, the processor performs ischemia detection on both beat types.

Abstract: A method of detecting and classifying cardiac arrhythmias, comprising: receiving a hemodynamic wave signal from at least one hemodynamic sensor by a processor; receiving a cardiac electrical wave signal from a cardiac stimulation device by the processor; integrating, by the processor, the received hemodynamic wave signal and the received cardiac electrical wave signal; determining if a heart arrhythmia is present via examination of the regularity of the hemodynamic signal; and if a heart arrhythmia is determined, classifying the arrhythmia according to a time correlation between the hemodynamic signal and the electrical signal.

Abstract: Systems and methods are disclosed to determine one or more sensing zones on a body surface for electrocardiographic mapping of a region of interest associated with the heart. The sensing zone can be utilized to facilitate acquisition, processing and mapping of electrical activity for the corresponding region of interest. In other examples, an application-specific arrangement of electrodes can also be provided based on the sensing zone that is determined for the region of interest.

Abstract: A first cardiac signal associated with an activity of a first implant site of a heart during a cardiac cycle is sensed. A second cardiac signal is sensed using an intrapericardial lead located on an epicardial surface proximate a second implant site of the heart. The second cardiac signal is associated with an activity of the second implant site during the cardiac cycle. A timing delay between the activity of the first implant site and the activity of the second implant site is obtained and analyzed to determine if the intrapericardial lead location is appropriate. The preceding is repeated until an appropriate intrapericardial lead location is determined. Other measurements obtained during implant determine whether the intrapericardial lead location is at or near slow conduction zone and whether the intrapericardial lead is placed at the location having the greatest mechanical delay. Post implant measurements determine whether the intrapericardial lead has migrated.

Abstract: A method for monitoring a biological cardiac pacemaker. The method may include stimulating a heart at a region selected for implantation of a biological pacemaker and sensing at least one electrical signal indicative of a cardiac depolarization originating in the region selected for implantation of the biological pacemaker. The method may further include sensing at least one subsequent electrical signal produced by the heart and determining if the subsequent electrical signal originated in the region selected for the biological pacemaker or another region of the heart.

Abstract: In general, the invention provides for commencing an atrioventricular (AV) search in response to an indicator of an autonomic nervous system (ANS) activity. An implantable medical device (IMD) may be configured to apply this technique, and also to apply rate adaptive ventricular pacing. In response to ANS activity such as an abrupt increase in cardiac sympathetic nervous activity, the IMD performs an AV search to find the intrinsic AV interval of the patient. The invention includes selection of a maximum AV delay so that the AV search will not adversely affect hemodynamic function.

Abstract: A method of predicting ventricular arrhythmias includes receiving an electrical signal from a subject's heart for a plurality of heart beats, identifying characteristic intervals and heart beat durations of the electrical signal corresponding to each of the plurality of heart beats to provide a plurality of characteristic intervals with corresponding heart beat durations, representing dynamics of the plurality of characteristic intervals as a function of a plurality of preceding characteristic intervals and durations of corresponding heart beats over a chosen period time, assessing a stability of the function over the chosen period of time, and predicting ventricular arrhythmias based on detected instabilities in the dynamics of the characteristic intervals.

Abstract: Implantable systems, and methods for use therewith, are provided for monitoring a patient's diastolic function and/or heart failure (HF) condition. A signal indicative of changes in arterial blood volume and a signal indicative of electrical activity of the patient's heart are obtained. Beginnings of diastolic periods can be detected based on a feature of the signal indicative of changes in arterial blood volume. Ends of the diastolic periods can be detected based on a feature of the signal indicative of electrical activity of the patient's heart, or on the signal indicative of changes in arterial blood volume. Diastolic periods (DPs), isovolumic relaxation times (IVRTs) and/or diastolic filling times (DiFTs) can be estimated based on the detected beginnings of the diastolic periods and detected ends of the diastolic periods. The patient's diastolic function and/or HF condition (and/or changes therein) can be monitored based on the estimates of DP, IVRT and/or DiFT.

Abstract: A method of differentiating between supraventricular tachyarrhythmia (SVT) and ventricular tachyarrhythmia (VT) is disclosed. A post pacing interval (PPI) is determined based on a biomarker dataset. The post pacing interval is statistically analyzed relative to a threshold to differentiate between SVT and VT. A further method of differentiating between SVT and VT is disclosed. A PPI is determined based on a biomarker dataset. A tachycardia cycle length (TCL) is also determined based on the biomarker dataset. A difference of the PPI minus the TCL is statistically analyzed relative to a threshold to differentiate between SVT and VT. A non-transitory computer readable medium and a system are also disclosed for differentiating between SVT and VT.

Abstract: The present disclosure is directed to an electrogram summary. In various examples, a subset of cardiac episodes are selected and displayed based on a set of summary rules. The subset of cardiac episodes includes at least one episode from each of a plurality of episode categories with at least one cardiac episode. In some examples, the order in which the cardiac episodes selected are displayed is based on the set of summary rules. The electrogram summary may include images or information regarding each of the selected cardiac episodes.

Abstract: A system and method provide for detecting atrial arrhythmias within an implantable medical device capable of sensing and pacing at least an atrium of a heart. Arrhythmia of the atrium is detected. In response to detecting atrial arrhythmia, delivery of pacing signals to the atrium is inhibited under certain conditions. While delivery of the pacing signals to the atrium is inhibited, the detected arrhythmia of the atrium is confirmed during a period of further evaluation. Delivery of pacing signals to the atrium is enabled upon ceasing of the atrial arrhythmia. Inhibiting delivery of the pacing signals during atrial arrhythmia evaluation advantageously provides for an increase in the rate at which the detected arrhythmia is confirmed.

Abstract: The present disclosure is directed to the classification of cardiac episodes using an algorithm. In various examples, an episode classification algorithm evaluates electrogram signal data collected by an implantable medical device. The episode classification algorithm may classify may include a sinus template and a comparison of the electrogram signal to the sinus template. Possible classifications of the cardiac episode may include, for example, unknown, inappropriate, appropriate, supraventricular tachycardia, ventricular tachycardia, ventricular fibrillation or ventricular over-sensing.