Pulse Transit Time in Anesthetized Patients: Blood Pressure or Cardiac Output as Measured With NICOM Monitor

During the surgery the continuous monitoring of blood pressure by peripheral artery catheter and cardiac output by NICOM (non-invasive cardiac output monitoring) will be applied. In case of intraoperative hemodynamic changes (hypertension, hypotension) the patient will be treated according to the standard care by Phenylephrine, Nitroglycerine or Colloid fluid boluses. Cardiac output will be measured by NICOM just before and after each treatment of hemodynamic events that described above. Simultaneous records of ECG, arterial and plethysmographic waveforms will be made just before and after each event. Systolic blood pressure and PuTT will be measured OFFLINE from the recorded waveforms