A Comparison of Thoracic Electrical Bioimpedance and FloTrac/Vigileo

A Comparison of Stroke Volume Variation for Prediction of Fluid Responsiveness Measured by Thoracic Electrical Bioimpedance and FloTrac/Vigileo

Stroke volume variation (SVV) is an indicator used to assess the patient's volume status. The FloTrac system (Edwards Lifesciences, Irvine, CA) continuously monitors cardiac output (CO) and SVV (SVV-FloTrac) by analyzing the systemic arterial pressure wave. Numerous studies have demonstrated that SVV-FloTrac serves as a reliable indicator of fluid responsiveness. However, its peripheral invasiveness raises concerns about susceptibility to reflecting waves, damping, and vascular tone influences.In contrast, Transthoracic electrical bioimpedance (BioZ.com™) offers a non-invasive approach for continuously monitoring various hemodynamic variables. In this study, the primary aim was to assess the agreement between simultaneously measured SVV-FloTrac and SVV-BioZ.

Inclusion Criteria:

• Age 18≤ Age ≤65.
• patients undergoinglaparoscopic elective surgery for gastrointestinal tumors under general anesthesia
• 18 kg/m2≤BMI≤30 kg/m2
• ASA classification I-III
• Patients signed informed consent form

Exclusion Criteria:

• Arrhythmias
• The patient is diagnosed with severe cardiovascular disease（pulmonary arterial hypertension、left ventricular ejection fraction< 50%、aortic aneurysm、extensive peripheral arterial occlusive disease,、significant valvulopathy）
• Severe heart failure (METS<4)
• The patient is diagnosed with severe hepatic dysfunction (ChildePugh class C)
• The patient is diagnosed with severe renal dysfunction (undergoing dialysis before surgery)
• There is an infectious lesion on the skin or subcutaneous tissue where the non-invasive electrode piece is placed
• History of allergy to anesthetic drugs
• Weight<40kg
• Allergies to 6% hydroxyethyl starch, Fresenius Kabi, Deutschland