摘要:
A cardiac pacing system controls the progression of a cardiac disorder such as heart failure by delivering cardiac stress augmentation pacing to create or augment regional stress in the heart according to a delivery schedule programmed for a patient. Various events associated with the patient's conditions, activities, and other treatments may render the cardiac stress augmentation pacing risky or ineffective. The system detects such events before and during each cardiac stress augmentation pacing session and modifies the delivery schedule in response to the detection of each event to ensure patient safety and therapy efficiency.
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. The device may be configured to deliver high-output pacing upon detection of cardiac decompensation.
摘要:
Various embodiments intermittently deliver a sympathetic stimulus, including deliver a sequence of stress-inducing pacing pulses adapted to increase sympathetic tone during the stress-inducing pacing. The stress-inducing pacing results in a parasympathetic reflex after the sequence of stress-inducing pacing. The embodiment further delivers neural stimulation to elicit a parasympathetic response or a sympathetic response in a coordinated manner with respect to the sequence of stress-inducing pacing pulses. The neural stimulation is timed to elicit the parasympathetic response after the sequence of stress-inducing pacing pulses and concurrent with at least a portion of the parasympathetic reflex to the sequence of stress-inducing pacing to enhance a parasympathetic effect of the parasympathetic reflex, or to elicit the sympathetic response during the sequence of stress-inducing pulses to provide a larger sympathetic stimulus, resulting in an enhanced parasympathetic reflex in response to the large sympathetic stimulus.
摘要:
A cardiac pacing system controls the progression of a cardiac disorder such as heart failure by delivering cardiac stress augmentation pacing to create or augment regional stress in the heart according to a delivery schedule programmed for a patient. Various events associated with the patient's conditions, activities, and other treatments may render the cardiac stress augmentation pacing risky or ineffective. The system detects such events before and during each cardiac stress augmentation pacing session and modifies the delivery schedule in response to the detection of each event to ensure patient safety and therapy efficiency.
摘要:
Cardioprotective pre-excitation pacing may be applied to stress or de-stress a particular myocardial region delivering of pacing pulses in a manner that causes a dyssynchronous contraction. Such dyssynchronous contractions are responsible for the desired cardioprotective effects of pre-excitation pacing. A method and device for applying reverse hysteresis and mode switching to the delivery of such cardioprotective pacing are described.
摘要:
Cardioprotective pre-excitation pacing may be applied to stress or de-stress a particular myocardial region delivering of pacing pulses in a manner that causes a dyssynchronous contraction. Such dyssynchronous contractions are responsible for the desired cardioprotective effects of pre-excitation pacing but may also be hazardous. Described herein is a method and system that uses measures of a patient's heart rate or exertion level to control the duty cycles of intermittent pre-excitation pacing.
摘要:
A pacing system delivers cardiac protective pacing therapy (CPPT) to protect the heart from injuries and/or to treat existing injuries. The pacing system receives a set of inputs and delivers optimized cardiac protection pacing tailored for different purposes. The system delivers electrical stimulation to modulate myocardial strain for anti-atherosclerosis therapy and/or to provide therapy for myocardial infarction (MI). In one embodiment, a medical device for treating atherosclerosis is provided. The medical device includes a sensing circuit to receive sensed signals to identify areas of coronary artery disease (CAD) or areas at risk for CAD using the sensed signals. The device also includes a pacemaker circuit adapted to deliver an electrical signal through at least one electrode to a myocardial target adjacent to the identified areas. According to various embodiments, a controller communicates with the sensing circuit and controls the pacemaker circuit to provide intermittent electrical stimulation to the myocardial target to induce periods of stretch on the vessel due to induce myocardial strain changes. The stimulation is targeted to attenuate or prevent atherosclerosis associated with the CAD, according to various embodiments.
摘要:
Various system embodiments comprise means for intermittently delivering a sympathetic stimulus, including means for delivering a sequence of stress-inducing pacing pulses adapted to increase sympathetic tone during the stress-inducing pacing. The stress-inducing pacing results in a parasympathetic reflex after the sequence of stress-inducing pacing. The embodiment further includes means for delivering neural stimulation to elicit a parasympathetic response or a sympathetic response in a coordinated manner with respect to the sequence of stress-inducing pacing pulses. The neural stimulation is timed to elicit the parasympathetic response after the sequence of stress-inducing pacing pulses and concurrent with at least a portion of the parasympathetic reflex to the sequence of stress-inducing pacing to enhance a parasympathetic effect of the parasympathetic reflex, or to elicit the sympathetic response during the sequence of stress-inducing pulses to provide a larger sympathetic stimulus, resulting in an enhanced parasympathetic reflex in response to the large sympathetic stimulus.
摘要:
This document discusses, among other things, an apparatus comprising at least one implantable cardiac depolarization sensing circuit, an electrical stimulation circuit, and a pacing mode controller. The implantable cardiac depolarization sensing circuit is configured to obtain a sensed depolarization signal from a ventricle and the electrical stimulation circuit is configured to provide pacing electrical stimulation energy to at least one implantable ventricular electrode. The pacing mode controller delivers pacing therapy according to a first pacing mode that is a normal operating mode, and delivers pacing therapy according to second and third pacing modes. The second and third pacing modes increase mechanical stress on at least a particular portion of the ventricle as compared to the pacing therapy delivered during the first pacing mode. The pacing mode controller alternates between the second and third pacing modes when switched from the normal operating mode to a stress augmentation mode.
摘要:
Disclosed herein, among other things, is a device for providing a localized vasomodulation of a vessel. According to an embodiment, the device includes a thermal element configured to conduct thermal energy between the thermal element and a desired region of the vessel wall to elicit the localized vasomodulation of the vessel at the desired region. The device also includes a controller operationally connected to the thermal element. The controller is adapted to control the conduction of thermal energy between the thermal element and the desired region of the vessel wall to control the localized vasomodulation of the vessel at the desired region. In various embodiments, a sensor connected to the device provides feedback to the controller.