Obtaining cardiovascular and/or respiratory information from mammalian body

In the field of obtaining cardiovascular information from a mammalian body (2) in a measurement action performed during a measurement period comprising a period after a point in the vascular system of the mammalian body (2) at which the temperature significantly deviates from the temperature of the mammalian body (2) has been generated, the measurement period being in the entire measurement period, the measurement period being in the region of obtaining the cardiovascular information from the mammalian body (2). A value representative of a temperature difference from a baseline temperature is measured at at least one location close to, on, or in the mammalian body by means of a measuring device (20) comprising at least one ultra-sensitive sensor (21) having a high resolution, the sensor is configured to be able to record at least two subsequent indicator dilution profiles in a temperature difference course associated with a respective side of the heart. An actual example of the sensor (21) is a photon sensor,