The invention relates to a method and apparatus for diagnosis, performance and/or regulation of physiological functions, in particular in an anaesthetized patient. The apparatus has a pressure device (10) for at least one body region or extremity (55) of a patient (50), wherein pressure-increasing means (21) and pressure-reducing means (22) are assigned to the pressure device (10), and a control device (30) is provided with which the pressure in the pressure device (10) can be controlled via the pressure-increasing means (21) and the pressure-reducing means (22).
