Patient stratification for implantable subcutaneous cardiac monitoring and therapy
First Claim
1. A patient screening method, comprising:
- delivering a pacing stimulus to a heart of a patient using one or more surface electrodes, the pacing stimulus delivered at a surface pacing level; and
determining that the patient is not a candidate for implantation of a subcutaneous defibrillation system if the surface pacing level needed to capture the patient'"'"'s heart is beyond a predetermined level.
1 Assignment
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Accused Products
Abstract
Systems and methods of verifying that implantable cardiac devices operate as intended in a particular patient involve one or more of determining proper placement of system components, determining stimulus levels useful for individual patient stratification, and determining stimulus levels that indicate efficacy of devices, implantable within a given patient. A pacing stimulus set at a surface pacing level is delivered to a patient'"'"'s heart using surface electrodes. The patient is determined to not be a candidate for implantation of a subcutaneous defibrillation system if the surface pacing level needed to capture the heart exceeds a predetermined level. The patient may be determined to be a candidate for implantation of a subcutaneous system if the surface pacing level needed to effect capture is within an acceptance level. Such determinations are preferably based on a proportionality relationship between a subcutaneous defibrillation level and a surface pacing level.
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Citations
57 Claims
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1. A patient screening method, comprising:
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delivering a pacing stimulus to a heart of a patient using one or more surface electrodes, the pacing stimulus delivered at a surface pacing level; and determining that the patient is not a candidate for implantation of a subcutaneous defibrillation system if the surface pacing level needed to capture the patient'"'"'s heart is beyond a predetermined level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A patient screening method, comprising:
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locating at least two surface electrodes on a thorax of a patient; determining a surface pacing threshold for effecting cardiac capture using the at least two surface electrodes; and determining if the patient is a candidate for implantation of a subcutaneous defibrillation system based on the surface pacing threshold. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A system, comprising:
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a pulse generator configured to deliver a pacing stimulus at a pacing level; detection circuitry; a plurality of surface electrodes coupled to the pulse generator and to the detection circuitry, the plurality of surface electrodes configured for positioning on a thorax of a patient relative to the patient'"'"'s heart; a user interface; and a controller coupled to the pulse generator, detection circuitry, and user interface, respectively, the controller determining suitability of the patient to receive a subcutaneous defibrillation device based at least in part on detection of capture or non-capture resulting from delivery of the pacing stimulus at the pacing level. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A system, comprising:
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detection circuitry; energy delivery circuitry; a plurality of surface electrodes coupled to the detection and energy delivery circuitry, the plurality of surface electrodes configured for positioning on a patient'"'"'s thorax relative to the patient'"'"'s heart; means, coupled to the detection and energy delivery circuitry, for determining capture or non-capture in response to delivery of a surface pacing stimulus; and means, coupled to the capture determining means, for determining if the patient is a candidate for implantation of a subcutaneous defibrillation device based at least in part on the capture or non-capture determination. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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44. A patient screening method, comprising:
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providing at least a pair of surface electrodes situated on a support structure, the pair of surface electrodes comprising a first and second surface electrodes having a fixed spatial relationship relative to one another; locating the first surface electrode at a first location on a thorax of a patient; moving the support structure to locate the second surface electrode at a second location on the patient'"'"'s thorax; determining a surface pacing threshold for effecting cardiac capture using the first and second surface electrodes; and determining if the patient is a candidate for implantation of a subcutaneous defibrillation system based on the surface pacing threshold. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A patient stratification system, comprising:
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an electrode support assembly; a plurality of surface electrodes supported by the electrode support assembly and having a fixed spatial relationship relative to one another, the plurality of surface electrodes configured for positioning on a thorax of a patient relative to the patient'"'"'s heart; a pulse generator coupled to the plurality of surface electrodes and configured to deliver a pacing stimulus at a pacing level and a defibrillation stimulus at a defibrillation level; detection circuitry coupled to the plurality of surface electrodes; and a controller coupled to the pulse generator and detection circuitry, the controller determining suitability of the patient to receive a subcutaneous defibrillation device based at least in part on detection of capture or non-capture resulting from delivery of the pacing stimulus at the pacing level. - View Dependent Claims (55, 56, 57)
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Specification