Patent ID: 9403017
Filing Date: 2016-08-02
CPC Classification: A61B,A61M,A61N

Claim Text:
1. A system comprising: a preload altering device; an implantable device including wherein the control circuit is configured to measure a first state of the patient based on a first monitored S1 heart sound and a first monitored proxy variable and to measure a second state of a patient based on a second monitored S1 heart sound and a second monitored proxy variable; and wherein the control circuit is configured to determine that the heart has reached a critical preload by a comparison of the first state to the second state; and wherein the control circuit is configured to determine that the heart has reached a critical preload by a determination of a slope between the first state and the second state and comparing the slope to a threshold value, the threshold value being a value that approximately corresponds with the critical preload level on a Frank Starling curve.