摘要:
A medical device system and associated method for controlling a cardiac rhythm management therapy detect extracardiac stimulation. Cardiac pacing pulses are delivered, and a cardiac electrical signal comprising myocardial depolarization and repolarization signals is acquired. A processor is configured to, responsive to the cardiac electrical signal, detect extracardiac capture due to the cardiac pacing pulse.
摘要:
A medical device system and associated method for controlling a cardiac rhythm management therapy detect extracardiac stimulation. Cardiac pacing pulses are delivered, and a cardiac electrical signal comprising myocardial depolarization and repolarization signals is acquired. A processor is configured to, responsive to the cardiac electrical signal, detect extracardiac capture due to the cardiac pacing pulse.
摘要:
A system and associated method deliver a respiration therapy. Stimulation pulses are delivered to activate a right portion of a patient's diaphragm and to activate a left portion of a patient's diaphragm. A control processor determines dyssynchrony of a respiratory response to the stimulation pulses and adjusts a stimulation control parameter controlling the delivering of the stimulation pulses in response to dyssynchrony of the respiratory response.
摘要:
The operation of an implantable medical device executing at least one set of firmware code is modified using a hardware/firmware trap at a point of execution of the set of firmware code. A patch code for directing the implantable medical device to perform a particular task is provided for execution when the trap generates an interrupt. The operation thereafter returns to the point of execution of the set of firmware code where the interrupt was generated and execution of the set of firmware code continues in a normal manner.
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.
摘要:
Arithmetic Units in an SIMD processor are configurated so that status is computed based upon arithmetic conditions. This status could reflect conditions such as "A greater than B", "A equal to zero", or "overflow". The status implemented in a SIMD processor is dependent upon the specific application of the processor. values of 0 or 1, representing status conditions of true or false are typically latched in a status latch. One of the status latch bits can then be selected through a Multiplexer, (the selecting being done by an instruction from the control unit), and is called the selected condition. This selected condition is serially shifted into a Status Shift Register. The accumulated status bits from several data computations can be built up in the Status Shift Register, where the new selected condition bit is shifted in, and all the original bits in the Status Shift Register are shifted left one place. These accumulated status conditions can then be added to the common address provided to all the Arithmetic Units. This provides the capability to modify memory addresses within the Arithmetic Units based upon data computations, and allows data dependent algorithms to be performed within a SIMD processor without the loss in efficiency found in conditional activate/deactivate schemes, since the Arithmetic Units are always active.
摘要:
A medical device and associated method detect ischemia using stimulation delivered to induce respiration. A spontaneous breathing response to the stimulation-induced respiration is determined. Ischemia is detected in response to the spontaneous breathing response. The spontaneous breathing response is measured as a response to adjusting a parameter controlling the stimulation.
摘要:
A system and method for delivering a nerve stimulation therapy determines whether a cardiac EGM signal can be sensed by a bipolar pair of electrodes selected from a number of electrodes positioned for stimulating a nerve. In response to not being able to sense a cardiac signal using the bipolar pair, stimulation of the nerve using a selected pair of the electrodes is enabled.
摘要:
A medical device and associated method detect ischemia using stimulation delivered to induce respiration. A spontaneous breathing response to the stimulation-induced respiration is determined. Ischemia is detected in response to the spontaneous breathing response. The spontaneous breathing response is measured as a response to adjusting a parameter controlling the stimulation.
摘要:
Techniques are described for detecting conduction abnormalities in a heart of a patient. In particular, an IMD may be configured to obtain electrical signals corresponding to cardiac activity of the heart of the patient and periodically analyze a most recent electrical signal of the obtained electrical signals to detect an electrical conduction abnormality of the heart. The IMD adjusts a frequency at which the most recent electrical signal is analyzed based on at least one physiological parameter of the patient. For example, the IMD may increase the frequency at which the most recent electrical signal is analyzed when a heart rate parameter has significantly changed and the number of detected premature ventricular contractions (PVCs) is greater than or equal to a threshold number. In this manner, the most recent electrical signal is analyzed at a higher frequency in situations in which conduction abnormalities are more likely.