1. A method for monitoring mucosal damage in hollow viscous organs comprising the steps of: a. inserting a distal end of a catheter, with a plurality of spaced apart electrodes, into a hollow viscous organ, b. obtaining a complex impedance spectrum of the mucosa lining the hollow viscous organ by using an impedance spectrometer to electrically drive the electrodes; and c. analyzing the complex impedance spectrum to determine the extent to which the mucosa is damaged.