Methods and systems for measuring cardiac parameters
First Claim
1. A method for measuring a cardiac performance parameter, the method comprising repeating over a series of two or more consecutive heart cycles:
- causing a change in at least one of volume and pressure in a heart chamber at a selected time during a heart cycle;
measuring a change in at least one characteristic of the heart chamber which occurs in response to the change in at least one of volume and pressure; and
calculating at least one cardiac performance parameter based on a ratio of the measured change in the characteristic to the caused change.
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Abstract
Methods and systems of the present invention provide for measurement of various cardiac parameters. Methods generally involve causing a change in volume and/or pressure in a heart chamber, measuring the change, and calculating at least one cardiac parameter based on the change. Systems typically include at least one actuator, at least one sensor, and a catheter or other device for positioning at least partially in a heart chamber. In some embodiments, the system may also include a controller, such as a computer or other processor, an external actuator, an external sensor, and/or an ECG device. Methods and systems of the invention may be used to more accurately diagnose cardiac conditions in order to make more informed treatment decisions.
259 Citations
77 Claims
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1. A method for measuring a cardiac performance parameter, the method comprising repeating over a series of two or more consecutive heart cycles:
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causing a change in at least one of volume and pressure in a heart chamber at a selected time during a heart cycle; measuring a change in at least one characteristic of the heart chamber which occurs in response to the change in at least one of volume and pressure; and calculating at least one cardiac performance parameter based on a ratio of the measured change in the characteristic to the caused change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77)
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Specification