Method of controlling the stimulation amplitude of a cardiologic implant
First Claim
1. A method of controlling a stimulation amplitude of a cardio-logic implant, which performs right and left chamber stimulation of a heart, using a left chamber stimulation electrode (14) in a coronary vein (13), comprising the following steps:
- detecting a stimulation impedance during delivery of left chamber stimulation pulses in the form of a measured value representative of the delivered stimulation pulse as a criterion for capture;
determining and storing a comparative stimulation impedance value representative of a stimulation;
detecting an amplitude threshold for capture by determining a significant change in the detected stimulation impedance as compared to the stored comparative stimulation impedance value; and
adjusting the stimulation amplitude on the basis of the detected amplitude threshold.
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Abstract
The invention is directed to a method of controlling the stimulation amplitude of a cardiologic implant which includes
a stimulation impedance during delivery of left chamber stimulation pulses in the form of a measured value representative of the delivered stimulation pulse as a criterion for capture; determining and storing a comparative simulation impedance value representative of the stimulation; detecting an amplitude threshold for capture by determination of a significant change in the detected stimulation impedance as compared to the stored comparative stimulation impedance value; and then adjusting the stimulation amplitude on the basis of the detected amplitude threshold.
27 Citations
20 Claims
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1. A method of controlling a stimulation amplitude of a cardio-logic implant, which performs right and left chamber stimulation of a heart, using a left chamber stimulation electrode (14) in a coronary vein (13), comprising the following steps:
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detecting a stimulation impedance during delivery of left chamber stimulation pulses in the form of a measured value representative of the delivered stimulation pulse as a criterion for capture;
determining and storing a comparative stimulation impedance value representative of a stimulation;
detecting an amplitude threshold for capture by determining a significant change in the detected stimulation impedance as compared to the stored comparative stimulation impedance value; and
adjusting the stimulation amplitude on the basis of the detected amplitude threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 12)
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9. A method of controlling a stimulation amplitude of a cardiologic implant which performs right and left chamber stimulation of a heart, using a tripolar stimulation arrangement comprising a left chamber stimulation electrode (14) in a coronary vein (13), a right chamber simulation electrode (9) in an associated right cardiac chamber (3) and a counter electrode (10), comprising the following steps:
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detecting a stimulation impedance during delivery of left chamber stimulation pulses in form of a measured value representative of the delivered stimulation pulse as a criterion for capture;
determining and storing a comparative stimulation impedance value representative of stimulation;
detecting an amplitude threshold for capture by determining a significant chance in the detected stimulation impedance as compared to the stored comparative stimulation impedance value; and
adjusting the stimulation amplitude on the basis of detected amplitude threshold, wherein during the detection of the amplitude threshold, the stimulation impedance is monitored for an occurrence of a significant impedance increase upon transition from right chamber rapture to both left and right chamber capture and wherein the stimulation amplitude is adjusted to an amplitude value found upon the transition. - View Dependent Claims (10, 13, 14, 15, 16)
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11. A method of controlling a stimulation amplitude of a cardiologic implant, which performs right and left chamber stimulation of a heart, using a left chamber stimulation of a heart, using a left chamber stimulation electrode (14) i a coronary vein (13) and a counter electrode (10), in a right chamber (3) comprising the following steps:
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detecting a stimulation impedance during delivery of left chamber stimulation pulses in form of a measured value representative of the delivered stimulation pulse as a criterion for capture;
determining and storing a comparative stimulation impedance value representative of stimulation;
detecting an amplitude threshold for capture by determining a significant change in the detected stimulation impedance as compared to the stored comparative stimulation impedance value; and
adjusting the stimulation amplitude on the basis the detected amplitude threshold, wherein as a measured impedance value which is representative of the delivered stimulation pulse, an impedance average is detected, which is integrated or averaged by current and voltage being continuously recorded and evaluated over the pulse. - View Dependent Claims (17, 18, 19, 20)
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Specification