An implantable cardiac device comprises a heart stimulator (10, 12) for electricly stimulating the heart of a patient, detecting means (2, 4) for measuring a physiologic parameter which is affected by the status of a cardiovascular disease associated with sympathetic activation, signal processing means (6) for determining at least one of a low frequency, LF, and a very low frequency, VLF, Mayer wave component in the measured parameter, and an analysor for analyzing the determined Mayer wave component in relation to a predetermined reference value to determine the status of the cardiovascular disease. The detecting means comprise measuring means (2) arranged to measure, as said physiologic parameter, a mechanical change in at least one of the four chambers of the heart. In a corresponding method for monitoring the status of a cardiovascular disease associated with sympathetic activation of a patient having an implantable electric heart stimulator (10, 12) a physiologic parameter affected by the cardiac disease is measured. At least one of a low frequency, LF, and a very low frequency, VLF, Mayer wave component in the parameter is determined, and the wave component is analysed in relation to a predetermined reference value to determine the status of the cardiovascular disease. A mechanical change in at least one of the four chambers of the heart is measured as the physiologic parameter.Linvention concerne un dispositif cardiaque implantable comprenant un stimulateur cardiaque (10, 12) pour stimuler électriquement le cœur dun patient, un moyen de détection (2, 4) pour mesurer un paramètre physiologique qui est affecté par létat dune maladie cardiovasculaire associée à une activation sympathique, un moyen de traitement de signal (6) pour déterminer au moins lune parmi une basse fréquence, LF, et une très basse fréquence, VLF, une composante donde de Mayer dans le paramètre mesuré, et un analyseur pour analyser la composante donde de Mayer déterminée en rapport avec une
