Patent ID: 8211032
Filing Date: 2012-07-03
Classification: A61N

Abstract:
1. An implantable cardiac stimulation device comprising: a first lead adapted to be implanted in or on the heart of a patient, wherein the first lead comprises a long axis and a first mechanical sensor positioned along the long axis, the first mechanical sensor configured to obtain measurements indicative of physical contraction and relaxation of the walls of the heart during systole and diastole, wherein the first lead is adapted to be implanted with its long axis at least partially around the basal region of the heart; a second lead adapted to be implanted in or on the heart of a patient, wherein the second lead comprises a long axis and a second mechanical sensor positioned along the long axis, the second mechanical sensor configured to obtain measurements indicative of physical contraction and relaxation of the walls of the heart during systole and diastole, wherein the second lead is adapted to be implanted with its long axis at least partially around the apical region of the heart; and a controller configured to receive signals from the first mechanical sensor and the second mechanical sensor indicative of contraction and relaxation of the walls of the heart, calculate a basal rotational velocity index based on the signals received from the first mechanical sensor, calculate an apical rotational velocity index based on the signals received from the second mechanical sensor, and derive a torsion index based on the basal rotational velocity index and the apical rotational velocity index.