To investigate whether PVI predicts the fluid responsiveness in modified prone position undergoing posterior approach cervical operation. Furthermore, modified prone position could influence on dynamic variables including stroke volume variation(SVV), pulse pressure variation(PPV) and PVI.
Objective : To compare measurements of pleth variability index (PVI), pulse pressure variation (PPV) and stroke volume variation (SVV) to predict fluid responsiveness in modified prone position or knee-chest position (concord position) for cervical operation. To identify Influence of the modified prone position (concord position) on these variables. Method 1. To assess influence of the position change on PVI and other variables(PPV, SVV) 2. To assess PVI to predict fluid responsiveness at modified prone position
Study Type
OBSERVATIONAL
Enrollment
44
To assess fluid responsiveness
Asan Medical Center
Seoul, Songpa-gu, South Korea
To assess influence of the position change on PVI and other variables(PPV, SVV)
When position change from supine to modified prone position, to assess the change of PVI and other variables. The correlation of PVI and cardiac output during this change.
Time frame: 1.supine position : 5 minute after anesthesia induction with arterial-line insertion 2. 5 min after crystalloid 4 ml/kg loading / 3. modified prone position (baseline)
To measure dynamic variables (pulse pressure variation, stroke volume variation and pleth variability index) in modified prone position
Record the data of variables after 5 minute hemodynamic stability without changes of drugs
Time frame: 1. Supine position : 5 minute after anesthesia induction with arterial-line insertion 2. 5 minute after a position change to prone 3. before and after fluid loading
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