SYSTEMS AND METHODS FOR MONITORING EFFECTIVENESS OF CONGESTIVE HEART FAILURE THERAPY
First Claim
1. A method for monitoring a patient, the method comprising:
- measuring a series of consecutive pulse transit times of the patient;
detecting a presence or absence of central sleep apnea according to the measured pulse transit times; and
determining an effectiveness of congestive heart failure therapy based on the detected presence or absence of central sleep apnea, the therapy being provided by electrical stimulation of the patient'"'"'s myocardial tissue, the stimulation being delivered from a medical device implanted in the patient.
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Accused Products
Abstract
A method for monitoring a patient includes measuring a series of consecutive pulse transit times (PTT'"'"'s) of the patient, and processing the resulting PTT signal to detect a presence or absence of central sleep apnea (CSA). The method further includes determining an effectiveness of congestive heart failure therapy, which is being provided to the patient, based on the detected presence or absence of CSA. A system incorporating the method includes an electrode of an implantable medical device, which is adapted to pick up the patient'"'"'s ventricular depolarization signals, a sensor, which is adapted to pick up peripheral arterial pulse signals of the patient, and a signal processor, which is adapted to receive the two types of signals and to process the signals according to the method. The system may provide the therapy via cardiac resynchronization pacing and, upon detection of CSA, the system may adjust at least one pacing parameter.
62 Citations
27 Claims
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1. A method for monitoring a patient, the method comprising:
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measuring a series of consecutive pulse transit times of the patient; detecting a presence or absence of central sleep apnea according to the measured pulse transit times; and determining an effectiveness of congestive heart failure therapy based on the detected presence or absence of central sleep apnea, the therapy being provided by electrical stimulation of the patient'"'"'s myocardial tissue, the stimulation being delivered from a medical device implanted in the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for monitoring a patient, the system comprising:
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an implantable medical device (IMD) for providing electrical stimulation of the patient'"'"'s myocardial tissue, the IMD including an electrode, a signal processor coupled to the electrode, and a wireless communications module coupled to the signal processor for transmitting the patient'"'"'s cardiac ventricular depolarization signals detected by the electrode; an external pulse-oximeter sensor for attachment to an extremity of the patient to measure peripheral arterial oxygen saturation of the patient; and an external signal processor coupled to the pulse-oximeter sensor and including a wireless communications module for receiving the transmitted depolarization signals from the IMD; wherein the external signal processor is adapted to; measure a series of consecutive pulse transit times, each pulse transit time being a time between each depolarization signal and a subsequent rise in oxygen saturation detected by the pulse-oximeter sensor; detect a presence or absence of central sleep apnea according to the measured pulse transit times; and determine an effectiveness of congestive heart failure therapy based on the detected presence or absence of central sleep apnea, the therapy being provided by the electrical stimulation of the patient'"'"'s myocardial tissue. - View Dependent Claims (12, 13, 14)
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15. A system for monitoring a patient, the system comprising:
an implantable medical device (IMD) for providing electrical stimulation of the patient'"'"'s myocardial tissue, the IMD including an electrode and a signal processor adapted to receive the patient'"'"'s cardiac ventricular depolarization signals from the electrode and to receive the patient'"'"'s peripheral arterial pulse signals, the signal processor including pre-programmed instructions for a monitoring method, the monitoring method comprising; measuring a series of consecutive pulse transit times, each pulse transit time being a time between a depolarization signal of the patient'"'"'s cardiac ventricular depolarization signals and an immediately subsequent pulse signal of the patient'"'"'s peripheral arterial pulse signals; detecting a presence or absence of central sleep apnea according to the measured pulse transit times; and determining an effectiveness of congestive heart failure therapy based on the detected presence or absence of central sleep apnea, the therapy being provided by the electrical stimulation of the patient'"'"'s myocardial tissue. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method for providing cardiac resynchronization therapy to a patient, the therapy delivered via pacing from an implanted medical device, the method comprising:
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measuring a series of consecutive pulse transit times of the patient; detecting a presence or absence of central sleep apnea according to the measured pulse transit times; and adjusting at least one pacing parameter of the implanted medical device, if the presence of central sleep apnea is detected. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification