A tissue opening occluder comprising first and second occluder portions, each occluder portion including a frame structure and an attachment structure to attach one portion to the other portion. The frames may be utilized to constrain the tissue between the two portions enough to restrict the significant passage of blood therethrough. The frame portions may be covered by a fabric suspended from a perimeter thereof. The occluder portions are conjoined at least one point on each portion.

 
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> Detection of evoked post-stimulation potentials, in particular atrial potentials in an active implantable medical device such as cardiac pacemaker, defribillator, cardiovertor or multisite device

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