Performance of Non-Invasive Monitors During ANH

The Evaluation of Minimally Invasive Hemodynamic Monitors for the Assessment of Volume Responsiveness to Various Standard Replacement Fluids During Acute Normovolemic Hemodilution

The aim of this study is to assess the responsiveness of the standard minimally invasive hemodynamic monitors used in the operating room to known changes in the intravascular volume status that occur during blood removal and volume replacement with three different standard fluids used during ANH.

Inclusion Criteria:

• Those surgical procedures where ANH is included in the surgical plan and consent is obtained

Exclusion Criteria:

• Severe or symptomatic COPD, emphysema, renal, hepatic or coronary artery disease as defined by the American College of Cardiology (Cannon et al., 2001).
• Esophageal pathology (diverticulum, hiatal hernia, esophageal cancer, esophageal surgery), which introduces risks associated with the placement of the esophageal Doppler.
• Ascites.
• BMI >35
• Pregnancy