摘要:
A system and method for discriminating cardiac rhythms occurring in an antegrade direction from cardiac rhythms occurring in a retrograde direction. Atrial and ventricular contractions are sensed, from which atrial and ventricular cycle lengths are determined. Ventricular contractions are also analyzed to determine the occurrence of a tachycardia episode that has a one-to-one association of atrial contractions to ventricular contractions. During a tachycardia episode having a one-to-one association of atrial contractions to ventricular contractions, the atrial cycle lengths are paired with the ventricular cycle lengths, where for each of the atrial cycle lengths the atrial cycle length is paired with at least one ventricular cycle length started before the first atrial contraction of each of the atrial cycle lengths and paired with at least one ventricular cycle length started after the first atrial contraction of each of the atrial cycle lengths. A retrograde correlation coefficient is then determined for the atrial cycle lengths paired with the ventricular cycle lengths started before the first atrial contraction, and an antegrade correlation coefficient is determined for the atrial cycle lengths paired with the ventricular cycle lengths started after the first atrial contraction. The tachycardiac episode is then classified based on a comparison of the antegrade correlation coefficient and the retrograde correlation coefficient.
摘要:
A method and apparatus for implementing a signal morphology preservation smoothing scheme. The smoothing scheme includes generating an output signal representative of a filtered version of the input signal, wherein the output signal is generated by adaptively removing low amplitude, high frequency noise components while simultaneously preserving signal morphology of the input signal. The smoothing scheme includes comparison of a distance metric against a distance threshold to determine whether an initial smoothed version of the input signal would be oversmoothed or undersmoothed. Then the smoothing scheme appropriately increments, decrements, or maintains the initial level of smoothing to generate an optimal smoothed signal representative of the output signal.
摘要:
A data logging system and method in which an implantable medical device transmits logged data to an external data logging device with low energy potential signals. The implantable device generates potential signals modulated with digitally encoded data by operating a current source to cause corresponding electrical potentials that can be sensed at the skin surface by the external data logging device. The data logging device then demodulates the sensed potentials to derive the digital data and stores the data in a data logging storage medium.
摘要:
A method and a system for preserving patient specific data in implantable pulse generator systems. A communication link is established with a first implantable pulse generator. Electronic cardiac data contained within the first implantable pulse generator is retrieved through the communication link. The electronic cardiac data is then electronically downloaded to a second implantable pulse generator. Prior to downloading, the electronic cardiac data can be formatted into a format compatible with the second implantable pulse generator.
摘要:
A cardiac rhythm management system predicts when an arrhythmia will occur and in one embodiment invokes a therapy to prevent or reduce the consequences of the arrhythmia. A cardiac arrhythmia trigger/marker is detected from a patient, and based on the trigger/marker, the system estimates a probability of a cardiac arrhythmia occurring during a predetermined future time interval. The system provides a list of triggers/markers, for which detection values are recurrently obtained at various predetermined time intervals. Based on detection values and conditional probabilities associated with the triggers/markers, a probability estimate of a future arrhythmia is computed. An arrhythmia prevention therapy is selected and activated based on the probability estimate of the future arrhythmia.
摘要:
Tilting filter pans is disclosed having generally parallel leading and trailing sidewalls which are sloped at an angle to permit increased filtration rates for a predetermined filtering efficiency, and also to permit increased filtering efficiency where the feed rate is constant. The feed is a slurry from which the liquid is removed, and the filter cake being dumped by rotation of each filter pan at a predetermined point of movement of the filter pan along a cyclical path. Hold-down devices having a reduced volume are also used in combination with the improved pan design, so that an increased filtration rate is possible due to decrease in the required filter cake height. A cam arrangement is provided for turning the pans with minimum stress in a minimum length of pan travel, while avoiding collisions between adjacent pans and while permitting washing of each pan.
摘要:
An emergency notification (EN) computing device includes at least one processor and a memory in communication with the processor. The processor is programmed to receive, from a user device, an emergency report that identifies an emergency situation and is associated with a report location, receive user input defining an impact zone within a geographical region based on the report location and the emergency situation, collect location data from a plurality of mobile user devices associated with a plurality of bystanders, detect a first bystander located within the impact zone based on the location data, and automatically notify the first bystander of the emergency situation.
摘要:
This document discusses, among other things, systems and methods for using one or more inter-relations between within-patient detection methods and between-patient stratifier methods. A method comprises obtaining results of a first physiological assessment, wherein the first physiological assessment includes a between-patient assessment; and using the results to adjust one or more parameters of a second physiological assessment, wherein the second physiological assessment includes a within-patient assessment.
摘要:
Described herein are methods and devices that utilize electrical neural stimulation to treat heart failure by modulating a patient's autonomic balance in a manner that inhibits sympathetic activity and/or augments parasympathetic activity. Because other therapies for treating heart failure may also affect a patient's autonomic balance, a device for delivering neural stimulation is configured to appropriately titrate such therapy in either an open-loop or closed-loop fashion.
摘要:
An apparatus and method for adjusting the performance of an implanted device based on data including contextual information. Contextual information, including operational and performance data concerning the implanted device as well as the patient with the implanted device, is stored by a portable electronic device. In one embodiment, the portable electronic device is adapted for battery operation and includes a personal digital assistant (PDA). The portable electronic device is adapted for use as an interface to conduct wireless communications with the implanted device. In one embodiment, the portable electronic device interfaces with a clinical programmer for use by a physician.