摘要:
A method and device for treating myocardial ischemia in which an implantable pulse generator delivers electrical stimulation to electrodes disposed near a coronary artery. The stimulation parameters may be adjusted to produce vasodilation and/or vasoconstriction of the artery. The device may be configured to operate in a vasodilation and/or vasoconstriction mode in accordance with specified entry and exit conditions.
摘要:
This document discusses, among other things, a system and method for generating a stimulation energy to provide His-bundle stimulation for a cardiac cycle, receiving electrical information from the heart over at least a portion of the cardiac cycle, determining a characteristic of at least a portion of the received electrical information for the cardiac cycle, and classifying the cardiac cycle using the determined characteristic.
摘要:
Systems and methods to monitor cardiac mechanical vibrations using information indicative of lead motion are described. In an example, a system including an implantable medical device can include an excitation circuit configured to provide a non-tissue stimulating, non-therapeutic electrical excitation signal to a portion of an implantable lead. A receiver circuit can be configured to obtain information indicative of a mechanical vibration of the implantable lead due at least in part to one or more of an impact of at least a portion of the heart to the implantable lead, or friction contact between the implantable lead and cardiac tissue. The system can include a processor circuit configured to determine one or more of a lead mechanical status, or information indicative of valvular activity using the information indicative of the mechanical vibration of the implantable lead.
摘要:
Methods and systems to modulate timing intervals for pacing therapy are described. For each cardiac cycle, one or both of an atrioventricular (A-V) timing interval and an atrial (A-A) timing interval are modulated to oppose beat-to-beat ventricular (V-V) timing variability. Pacing therapy is delivered using the modulated timing intervals.
摘要:
Cardiac protection pacing is applied to prevent or reduce cardiac injury and/or occurrences of arrhythmia associated with an ischemic event including the occlusion of a blood vessel during a revascularization procedure. Pacing pulses are generated from a pacemaker and delivered through one or more pacing electrodes incorporated onto a percutaneous transluminal vascular intervention (PTVI) device used in the revascularization procedure. The pacemaker generates the pacing pulses according to a predetermined cardiac protection pacing sequence before, during, and/or after the ischemic event.
摘要:
An implantable neural stimulation system includes an implantable medical device having a neural stimulation circuit and at least one implantable lead configured to allow one or more stimulation electrodes to be placed in one or more lymphatic vessels of a patient, such as the patient's thoracic duct and/or vessels branching from the thoracic duct. Neural stimulation pulses are delivered from the implantable medical device to one or more target regions adjacent to the thoracic duct or the vessels branching from the thoracic duct through the one or more stimulation electrodes.
摘要:
A catheter includes a flexible shaft having a length sufficient to access a patient's renal artery relative to a percutaneous access location. A treatment arrangement is provided at a distal end of the shaft and configured for deployment in the renal artery. The treatment arrangement includes an ablation arrangement configured to deliver renal denervation therapy. An occlusion arrangement is configured for deployment in the renal artery and for altering blood flow through the renal artery during or subsequent to renal denervation therapy delivery. A monitoring unit is configured for monitoring for a change in one or more physiologic parameters influenced by the renal denervation therapy. The monitoring unit is configured to produce data useful in assessing effectiveness of the renal denervation therapy based on the physiologic parameter monitoring.
摘要:
A device and method for delivering electrical stimulation to the heart in order to improve cardiac function in heart failure patients. The stimulation is delivered as high-output pacing in which the stimulation is excitatory and also of sufficient energy to augment myocardial contractility. In order to provide a consistent hemodynamic response, the high-output pacing is optimized by delivering it using different parameter sets, evaluating the hemodynamic response thereto as reflected by one or more measured physiological variables, and selecting the parameter set with the best hemodynamic response.
摘要:
Described herein are a method and apparatus for introducing instrumentation into the lymphatic system that can be used for physiological monitoring and/or delivery of therapy. Such instrumentation, for example, may include one or more sensors for measuring physiological variables and/or one or more instruments for delivering therapy that is adapted to be disposed within a lymphatic vessel.
摘要:
Acoustic energy is delivered to innervated vascular that contributes to renal sympathetic nerve activity, such as innervated tissue of the renal artery and abdominal aorta. Focused acoustic energy is delivered via an intravascular device of sufficient power to ablate innervated renal or aortal tissue. Focused acoustic energy may be delivered via an intravascular or extracorporeal device to image and locate target innervated renal or aortal tissue. Intravascular, extravascular, or transvascular focused ultrasound devices provide for high precision denervation of innervated vascular to terminate renal sympathetic nerve activity.