A heart stimulator has a stimulation energy delivering assembly, including
at least one lead adapted for implantation in contact with cardiac tissue,
and an atrial arrhythmia detector, and a control unit connected to the
stimulation energy delivering assembly and to the detector. The control
unit controls the stimulation energy delivering assembly to deliver at
least one atrial arrhythmia abolishing therapy and, if continued atrial
arrhythmia is detected, to deliver antithrombus stimulation energy pulses
of lower energy than a defibrillation shock, but with different timing and
with sufficient energy for producing atrial contraction for increasing
hemodynamic blood transportation away from the atrium and for preventing
thrombi formation in the atrium. For a patient suffering from a chronic or
paroxysmal non-curable atrial arrhythmia, the control unit controls the
stimulation energy delivering assembly to deliver the antithrombus energy
without any preceding arrhythmia abolishing therapy.
