摘要:
Systems and methods for monitoring phrenic nerve function of a patient are disclosed, including, including establishing a diaphragmatic movement value threshold; positioning a diaphragmatic movement sensor on an external surface of an abdomen of the patient; applying a treatment regimen to a tissue region in proximity to the phrenic nerve; measuring a diaphragmatic movement value with the diaphragmatic movement sensor; comparing the measured diaphragmatic movement value to the established diaphragmatic movement value threshold; and generating an alert in response to the comparison.
摘要:
A method and system of detecting phrenic nerve stimulation in a patient that includes detecting an activation event, obtaining a heart sound signal of a patient from an implanted heart sound sensor, determining that an electrical stimulation has been applied to the patient, in response to detecting the activation event, monitoring a portion of the heart sound signal, the portion defined by a predetermined window after the application of the electrical stimulation, and determining whether phrenic nerve stimulation occurred based on the portion of the heart sound signal.
摘要:
A medical device and associated method for discriminating cardiac events includes determining whether a cardiac evidence counter is greater than a predetermined detection threshold, advancing from a concerned state to a convinced state in response to the evidence counter being greater than the predetermined detection threshold, determining whether a reduction in the cardiac evidence counter occurs while in the convinced state, determining whether one of a first rate corresponding to the first sensing vector and a second rate corresponding to the second sensing vector is less than a predetermined rate limit, and determining whether to advance from the convinced state to one of a therapy delivery state, the concerned state and the unconcerned state in response to determining whether one of the first rate and the second rate is less than a predetermined rate limit.
摘要:
A medical device and associated method for discriminating cardiac events includes determining whether a cardiac evidence counter is greater than a predetermined detection threshold, determining whether to advance from a current state to a next state in response to the evidence counter being greater than the predetermined detection threshold, determining whether advancing from a previous state to the current state occurred while in one of a low variability mode and a high variability mode during the previous state, and determining whether to advance from the current state to a previous state in response to determining whether advancing from a previous state to the current state occurred while operating in one of a low variability mode and a high variability mode during the previous state.
摘要:
A medical device and associated method for discriminating cardiac events sense cardiac signals that includes determining whether a first match score is within one of a first match zone corresponding to a first cardiac event, and a second match zone corresponding to the first cardiac event, and determining whether a second match score is within one of the first match zone, the second match zone, and a third match zone corresponding to a second cardiac event different from the first cardiac event. One of increasing and decreasing an event counter is performed in response to both the determination of whether the first match score is within one of the first match zone and the second match zone and the determination of whether the second match score is within one of the first match zone, the second match zone, and the third match zone.
摘要:
Techniques are described for detecting a condition of a patient using a probability-correlation based model that integrates a plurality of parameters associated with the condition. A medical device that operates in accordance with the techniques obtains a plurality of parameters associated with the condition of the patient. The medical device obtains probabilities that the condition of the patient exists based on each single parameter separately and correlations between each of the parameters and the other ones of the parameters. After obtaining the probabilities and correlations associated with each of the parameters, the medical device determines whether the condition of the patient exists based on the determined probabilities and correlations. Such techniques may be particularly effective for use in distinguishing whether a rhythm of a patient is treatable, e.g., VT or VF, or non-treatable, e.g., SVT.
摘要:
A medical device and associated method sense a cardiac signal and initiate an arrhythmia episode detection process in response to the cardiac signal by enabling an arrhythmia detection counter to be adjusted during the detection process. Data is accumulated relating to cardiac events during the detection process. An arrhythmia episode profile is established using the accumulated data. The accumulated data includes a pattern of the adjustment of the detection counter during the detection process
摘要:
A medical device and associated method for discriminating cardiac events includes determining whether a cardiac evidence counter is greater than a predetermined detection threshold, advancing from a concerned state to a convinced state in response to the evidence counter being greater than the predetermined detection threshold, determining whether a reduction in the cardiac evidence counter occurs while in the convinced state, determining whether one of a first rate corresponding to the first sensing vector and a second rate corresponding to the second sensing vector is less than a predetermined rate limit, and determining whether to advance from the convinced state to one of a therapy delivery state, the concerned state and the unconcerned state in response to determining whether one of the first rate and the second rate is less than a predetermined rate limit.
摘要:
A medical device and associated method obtaining cardiac event intervals corresponding to a tachycardia interval. Evidence of a rhythm breaking point is obtained in response to sensing a cardiac event having a morphology corresponding to a supraventricular beat. A non-treatable rhythm is detected in response to the plurality of cardiac event intervals and the evidence of the rhythm breaking point.
摘要:
A medical device and associated method for monitoring a patient's heart rhythm sense cardiac events and detect a sudden change in the heart rhythm in response to the sensed cardiac events. Detecting the sudden change includes determining a variability of intervals between the sensed cardiac events and switching between a low variability mode of operation and a high variability mode of operation in response to the variability of intervals. During the low variability mode, detecting the sudden change includes detecting an increase in the rate of cardiac events. During the high variability mode, detecting the sudden change includes detecting a sudden decrease in the variability of the cardiac event intervals. A concerning cardiac rhythm is detected in response to detecting the sudden change.