CNAP Accuracy Dependent on Hemodynamic Variables

Accuracy of Continuous Non-invasive Arterial Pressure (CNAP) With Invasive Measurements Dependent on Cardiac Function, Vascular Resistance and Volume Status

Agreement of CNAP pressure with invasive pressure is evaluated dependent on hemodynamic variables achieved by a PICCO monitor.

Hypothesis: Low cardiac output and volume status but not high vascular resistance affect the accuracy of CNAP.

Agreement of CNAP pressure with invasive pressure is evaluated dependent on hemodynamic variables achieved by a PICCO monitor.

Hypothesis: Low cardiac output and volume status but not high vascular resistance affect the accuracy of CNAP. Body mass index and age may have impact on the accuracy of PPV measured non-invasively on the basis of volume-clamp technique.

Inclusion Criteria:

• need for invasive blood pressure measurement

Exclusion Criteria:

• age under 18
• emergencies
• cardiac dysrhythmia