Since the heart has used its last systolic contractions, the brain does not have much time.

Since the heart has made its last systolic contractions, the brain does not have much time.

As an example, the IMD may calculate an amount or rate of change in impedance due to the motion of a wall of the heart during at least a portion of one cardiac cycle, e.g., systole, in order to assess the strength of systolic contraction.

The device can be configured to begin to engage, to reduce wall stress during diastolic filling, or begin to engage to reduce wall stress during systolic contraction.

Renal insufficiency free of such antecedents and presenting a simple LVH, have indices of systolic contraction generally equal to those of control subjects, sometimes even superior (hypertrophic hyperkinetic cardiopathy).