Method for controlling pacing of a heart in response to changes in stroke volume

• US 4,708,143 A
• Filed: 07/14/1986
• Issued: 11/24/1987
• Est. Priority Date: 07/19/1984
• Status: Expired due to Term

• Current Assignee: Pacesetter Incorporated (Abbott Laboratories)
• Original Assignee: Cordis Leads Incorporated
• Inventors: Schroeppel, Edward A.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US06/885,063
• Time in Patent Office: 498 Days
• Field of Search: 128/419 PG
• US Class Current: 607/23
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61B 5/03 Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs A61B5/205 takes precedence
• CPC Class Codes: A61N 1/056 Transvascular endocardial electrode systems
• CPC Class Codes: A61N 1/36564 controlled by blood pressure

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.

Claims

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.

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; and

determining 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.