The Nexfin® monitoring system by Edwards life sciences could measure continuous non-invasive blood pressure through a finger-cuff for every single heart beat; moreover it calculates a CO and stroke-volume parameter utilizing a so-called pulse contour analysis provided by the non-invasive blood pressure measurement. This technology is based on an inflatable doublefinger-cuff wristband, which is attached to the patients hand and connected to a monitor. Using this wristband the arterial pressure within the patient's digital arteries will be continuously registered. Using a heart-frequency adapted algorithm - based on an alignment chart including healthy patients, patients with arterial hypertonia and micro/macro angiopathia - the software is also able to measure the brachial artery blood pressure.