Stimulating and provocative work with fiberoptic technology is reported in this volume. Invasive fiberoptic reflectometry has only been used up to now for monitoring intravascular oxygen saturation. These contributions examine how this technique can be clinically applied to measure other parameters in the critically ill patient. Methodological aspects are discussed, but the main focus is on clinical value and application. The authors look at measurements that can be evaluated using a flowdirected fiberoptic pulmonary artery catheter and an arterial fiberoptic thermodulution catheter. These...