摘要:
The above-described methods and apparatus are believed to be of particular benefit for patients suffering heart failure including cardiac dysfunction, chronic HF, and the like and all variants as described herein and including those known to those of skill in the art to which the invention is directed. It will understood that the present invention offers the possibility of monitoring and therapy of a wide variety of acute and chronic cardiac dysfunctions. The current invention provides systems and methods for delivering therapy for cardiac hemodynamic dysfunction via the innervated myocardial substrate receives one or more discrete pulses of electrical stimulation during the refractory period of said innervated myocardial substrate.
摘要:
One aspect of the invention involves a possible fault scenario due to a breach of an inner layer of insulation of an elongated medical electrical lead which couples an active electrical circuit for an active implantable medical device (AIMD)—typically within a conductive AIMD housing—to a sensor disposed within a sensor capsule. In one form, the AIMD provides physiological sensing of a patient parameter, such as endocardial pressure via a chronically implanted absolute pressure sensor. In such a physiological monitor, a high impedance connection is established between the active electrical circuit and the conductive AIMD housing. In a therapy delivering AIMD, a high impedance connection is established between therapy electrodes and the active electrical circuit. As a result, any errant electrical current(s) will be shunted directly to the reference-ground of the sensor-bearing lead in lieu of traveling through a patient's tissue or conductive body fluid.
摘要:
A fluid status monitoring system for use in implantable cardiac stimulation or monitoring devices is provided for monitoring changes in thoracic fluid content. A fluid status monitor includes excitation pulse generating and control circuitry, and voltage and current measurement and control circuitry for performing a series of cardiac-gated, intra-thoracic impedance measurements. The cardiac-gated measurements are filtered or time-averaged to provide a fluid status impedance value, with respiratory noise removed. Based on comparative analysis of the fluid status impedance value, a clinically relevant trend in fluid status may be tentatively diagnosed and a fluid status response provided. Cross-check intra-thoracic impedance measurements performed using the same or a different excitation pathway and a different measurement pathway than the primary intra-thoracic impedance measurement configuration may be used to verify a tentative diagnosis.
摘要:
In some embodiments, a method of operating an implantable cardiac pacing device to provide coupled ventricular pacing may include one or more of the following steps: (a) sensing ventricular events at a first ventricular site and generating a ventricular sense event signal in response thereto, (b) providing coupled pacing pulses simultaneously at the first ventricular site and at a second ventricular site at a ventricular extra stimulus interval (VESI) timed from immediately preceding ventricular sense event signals sufficient to effect post-extra-systolic potentiation (PESP) of the ventricular sites, and (c) providing pacing pulse at the second ventricular site after sensing ventricular events at the first ventricular site.
摘要:
An implantable medical device includes two or more pacing output channels coupled to a single unipolar electrode or bipolar electrode pair. The implantable medical device can control each pacing output channel to deliver pacing pulses via the single electrode or electrode pair at different times and with different amplitudes. In some embodiments, the implantable medical device is used to deliver extra-systolic stimulation therapy. In such embodiments, a first pacing output channel can be controlled to deliver pacing pulses via the electrode or electrode pair with an amplitude sufficient to depolarize a chamber of the heart. A second pacing output channel is controlled to deliver extra-systolic pulses, which can have a lower amplitude than the pacing pulses, via the electrode or electrode pair an extra-systolic interval after sensed or paced depolarizations of the chamber. In some embodiments, the implantable medical device delivers ESS therapy and cardiac resynchronization therapy (CRT).
摘要:
An implantable cardiac stimulation device capable of delivering ESS, monitoring for myocardial ischemia and responding to the detection of myocardial ischemia by modifying the delivery of ESS. Modification of ESS delivery may include disabling ESS, initiating ESS, and/or modifying ESS control parameters.
摘要:
An implantable medical device is configured so that all of the major components including a housing and attached leads are disposed within the vasculature of a patient. A tether extends from the housing of the device to an implant location where the tether is secured to tissue outside of the vasculature. In this manner, an intravascular medical device may be implanted at a location remote from final placement, delivered via the vasculature and anchored at the initial entry point.
摘要:
An implantable medical device is configured so that all of the major components including a housing and attached leads are disposed within the vasculature of a patient. A tether extends from the housing of the device to an implant location where the tether is secured to tissue outside of the vasculature. In this manner, an intravascular medical device may be implanted at a location remote from final placement, delivered via the vasculature and anchored at the initial entry point.
摘要:
An implantable medical device is configured so that all of the major components including a housing and attached leads are disposed within the vasculature of a patient. A tether extends from the housing of the device to an implant location where the tether is secured to tissue outside of the vasculature. In this manner, an intravascular medical device may be implanted at a location remote from final placement, delivered via the vasculature and anchored at the initial entry point.
摘要:
The present invention relates to the secure delivery of an extra-systolic stimulation (ESS) therapy to treat cardiac dysfunction that employs atrial and/or ventricular extra-systoles via pacing-like stimulation of the heart. These extra-systoles must be timed correctly to achieve beneficial effects on myocardial mechanics (benefit) while maintaining an extremely low level of risk of arrhythmia induction and excellent ICD-like arrhythmia sensing and detection (security). Further experience with ESS has led to improved implementation methods that depend on better blanking, ESS stimulation timing (of an “extra-systolic interval” or ESI), and ESS therapy delivery options and guidance. These methods may be employed individually or in combinations in an external or implantable ESS therapy delivery device.