Method for controlling pacing of a heart in response to changes in stroke volume
First Claim
1. A method for sensing opening and closing of a tricuspid valve in a heart, for using those sensings to determine stroke volume, and for controlling pacing of a heart relative to changes in stroke volume, utilizing a pacing lead having a lead body and a pressure sensor mounted in the lead body, said method comprising the steps of:
- sensing the opening of the tricuspid valve during each heart cycle;
sensing the closing of the tricuspid valve during each heart cycle;
determining ejection time from the openings and closing of the tricuspid valve;
calculating the change in ejection time, Δ
ET, from determinations of ejection time;
calculating changes in stroke volume, Δ
Sv,;
determining the required change in heart rate, Δ
R, relative to the change in stroke volume, Δ
Sv; and
adjusting the pacing rate of a pacer relative to the required change in heart rate, Δ
R.
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Accused Products
Abstract
A method for sensing opening and closing of a tricuspid valve in a heart, for using those sensings to determine stroke volume, and for controlling pacing of a heart relative to changes in stroke volume, utilizing a pacing lead having a lead body and a pressure sensor mounted in the lead body, said method comprising the steps of: sensing the opening of the tricuspid valve during each heart cycle; sensing the closing of the tricuspid valve during each heart cycle; determining ejection time from the openings and closings of the tricuspid valve; calculating the change in ejection time, ΔET, from determinations of ejection time; calculating changes, in stroke volume, ΔSV,; determining the required change in heart rate, ΔR, relative to the change in stroke volume, ΔSV,; and adjustng the pacing rate of a pacer relative to the required change in heart rate, ΔR.
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Citations
2 Claims
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1. A method for sensing opening and closing of a tricuspid valve in a heart, for using those sensings to determine stroke volume, and for controlling pacing of a heart relative to changes in stroke volume, utilizing a pacing lead having a lead body and a pressure sensor mounted in the lead body, said method comprising the steps of:
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sensing the opening of the tricuspid valve during each heart cycle; sensing the closing of the tricuspid valve during each heart cycle; determining ejection time from the openings and closing of the tricuspid valve; calculating the change in ejection time, Δ
ET, from determinations of ejection time;calculating changes in stroke volume, Δ
Sv,;determining the required change in heart rate, Δ
R, relative to the change in stroke volume, Δ
Sv; andadjusting the pacing rate of a pacer relative to the required change in heart rate, Δ
R.
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2. A method for sensing opening and closing of a tricuspid valve in a heart, for using those sensings to determine stroke volume, and for controlling pacing of a heart relative to changes in stroke volume, utilizing a pacing lead having a lead body and a pressure sensor mounted in the lead body, said method comprising the steps
sensing the opening of the tricuspid valve during each heart cycle; -
sensing the closing of the tricuspid valve during each heart cycle; determining ejection time from the openings and closings of the tricuspid valve; calculating the changes in ejection time, Δ
ET, from determinations of ejection time;calculating changes in stroke volume Δ
SV from the formula;
space="preserve" listing-type="equation">Δ
SV=0.30 (Δ
ET)+0.63; anddetermining the required change in heart rate, Δ
R relative to the change in stroke volume, Δ
Sv;adjusting the pacing rate of the pacer relative to the required change in heart rate, Δ
R.
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Specification