The esCCO monitor (estimated Continuous Cardiac Output) by Nihon Kohden (Nihon Kohden Europe GmbH, 61191 Rosbach, Deutschland) is another completely non-invasive measurement device, which is based on the pulse wave transit time (PWTT) as well as non-invasive blood pressure measurement, ECG and pulse oximetry. PWTT provides time adapted information, e.g. intravascular pressure transmission or information on changes in the arterial blood volume.