Validation of Stroke Volume Measurement by a New Noninvasive Hemodynamic Monitoring System (NexFin)in Comparison to Different Invasive Procedures as Picco2, FloTrac and TEE

Prospective, Monocentric Pilot Study for the Validation of Stroke Volume by Use of NexFin in Comparison to Different Hemodynamic Monitoring Procedures (Picco2, FloTrac and TEE)

Main hypothesis: there is no difference between stroke volume measurements recorded by a new noninvasive finger cuff system (NexFin) and invasive hemodynamic monitoring systems as Picco2-system, FloTrac and transesophageal echocardiography

In high risc patients undergoing orthopedic surgery an extended cardiopulmonary observation improves patients safety and postoperative outcome. Therefore invasive procedures as Picco2-system, FloTrac and transesophageal echocardiography (tee) have the advantage to measure or calculate stroke volume. Disadvantage of this treatments is the need for a vascular access with all its complications.

In this study the stroke volume measured by a new noninvasive finger cuff system (NexFin) should be validated in comparison to invasive hemodynamic monitoring systems as Picco2-system, FloTrac and tee.

Inclusion Criteria:

• patients undergoing orthopedic surgery with need for invasive blood pressure measurements
• age ≥ 18 years
• signed informed consent
• no participation on another interventional study

Exclusion Criteria:

• refusal of participation
• patients who are not able to sign informed consent
• atrial fibrillation with arrhythmia
• peripheral arterial disease > Fontain IIa
• scleroderma
• presence of an arterio-venous shunt on upper limb
• contraindication for femoral arterial vascular access
• contraindication for transesophageal echocardiography
• stage III heart valve defects
• shunt heart defects
• solitary regional anaesthesia
• pregnant or breastfeeding women