A5()A monitoring device is arranged to receive (401) at least one measurement signal obtained by at least one pressure sensor in an extracorporeal fluid system. The extracorporeal fluid system is in contact with a vascular system of a subject via a fluid connection. The monitoring device is configured to process (403) the measurement signal to identify pressure data that represents pulses originating from a first physiological phenomenon in the subject, excluding the heart of the subject. The extracorporeal fluid system may include an extracorporeal blood flow circuit, e.g. as part of a dialysis machine. The first physiological phenomenon may be any one of reflexes, voluntary muscle contractions, non-voluntary muscle contractions, a breathing system of the subject, an autonomous system of the subject for blood pressure regulation, or an autonomous system of the subject for body temperature regulation. The monitoring device may detect, present, track or predict (409) a disordered condition of the subj ect using the pressure data, or monitor (410) the integrity of the fluid connection based on the pressure data.
