Methods and systems for measuring cardiac parameters
First Claim
1. A method for measuring a cardiac performance parameter, the method comprising:
- 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.
242 Citations
87 Claims
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1. A method for measuring a cardiac performance parameter, the method comprising:
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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, 78)
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79. A system for measuring one or more parameters of a heart, the system comprising:
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a catheter comprising at least one sensor and at least one actuator for introducing a known volume of fluid into at least one chamber of the heart at a selected time during a heart cycle to effect a volume change in the heart chamber;
a fluid source coupled with the catheter for providing fluid to the actuator; and
a processor coupled with the catheter for processing data sensed by the at least one sensor. - View Dependent Claims (80, 81, 82, 83, 84, 85, 86, 87)
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Specification