A method for predicting an increased risk for a complication in a patient subjected to mechanical circulatory support. The method includes continuously, or within given intervals, registering a acoustic intensity verses frequency curve from the mechanical circulatory support. Repeated sound intensity verses frequency curves are registered from a patient to obtain a mean curve for the patient. New sound intensity-frequency curves are repeatedly obtained and compared with the mean curve. Significant deviations between a new sound intensity-frequency curve and the mean curve are detected and indicate an increased risk for a complication event.