System and method for changing device parameters to control cardiac hemodynamics in a patient
First Claim
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1. A method for pacing a heart of a patient via an implantable pacing device, the method comprising:
- during a first period of time, delivering electrical pacing to at least one of an atrium or a ventricle of the heart to increase the left ventricular contractility to produce an increased cardiac output; and
determining a second period of time when an activity level of the patient is less than an activity level of the patient during the first period of time, delivering the electrical pacing stimulation in response to detecting the second period of time to decrease the left ventricular contractility to a specified fraction of the left ventricular contractility achieved during the first period of time to produce a reduced cardiac output.
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Abstract
Pacing parameters may be adjusted to increase the cardiac output of a patient'"'"'s heart while a patient is awake and/or active and the demand placed on the heart may be greatest, and to decrease or hemodynamic efficiency while a patient is at rest so that the heart itself has time to rest before the next period of higher demand for efficiency begins. This may aid in lessening the strain placed on the heart by making the heart work hard when needed such as when the patient is active, and by permitting the heart to “rest” when the patient is relatively inactive.
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Citations
16 Claims
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1. A method for pacing a heart of a patient via an implantable pacing device, the method comprising:
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during a first period of time, delivering electrical pacing to at least one of an atrium or a ventricle of the heart to increase the left ventricular contractility to produce an increased cardiac output; and determining a second period of time when an activity level of the patient is less than an activity level of the patient during the first period of time, delivering the electrical pacing stimulation in response to detecting the second period of time to decrease the left ventricular contractility to a specified fraction of the left ventricular contractility achieved during the first period of time to produce a reduced cardiac output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for pacing a heart of a patient via an implantable pacing device, the method comprising:
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during a first period of time, delivering electrical stimulation to at least one of an atrium or ventricle of the heart to increase the cardiac work of the heart wherein cardiac work is representative of energy efficiency of the heart; and determining a second period of time when an activity of the patient is less than an activity level of the patient during the first period of time; delivering the electrical pacing stimulation when an activity level of the patient is less than an activity level of the patient during the first period of time to decrease the cardiac work of the heart to a specified fraction of the cardiac work achieved during the first period of time. - View Dependent Claims (14, 15, 16)
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Specification