The present invention relates to an apparatus for determining a property of a heart. The apparatus comprises a catheter (5), which comprises a first property sensing unit for sensing a contraction signal indicative of a reoccurring local contraction of the heart (2) at a sensing site of the heart (2). The apparatus further comprises a first property determining unit (8) for determining the reoccurring local contraction of the heart (2) at the sensing site from the sensed contraction signal as a first property of the heart (2). The reoccurring local contraction provides information about the heart (2), which can be used for a better and/or more reliable characterization of the heart (2).
