Hypotension Clinical Trial
Official title:
Prediction of Hypotension Using Perfusion Index and Pleth Variability Index After Spinal Anesthesia for Caesarean Section
Spinal anesthesia for caesarean section is associated with a decrease in systemic vascular
resistance and cardiac output and may cause hypotension in a significant portion of the
parturients. Hypotension during delivery may cause maternal and fetal complications. If
parturients who are likely to develop hypotension after spinal anesthesia can be identified
before surgery, anesthesiologists would have opportunity to take measures such as
prophylactic vasopressor administration.
Perfusion index (PI) measured by pulse oximetry reflects vasomotor tone which affects the
degree of hypotension after spinal anesthesia. This is a non-invasive method of assessing the
relative vascular tone with the use of pulse oximeter which calculates the ratio of pulsatile
versus the non-pulsatile component of the blood flow. A lower PI indicates greater peripheral
vasomotor tone.
Pleth variability index (PVI) is calculated using maximum and minimum values of perfusion
index during respiratory cycles. PVI is one of the dynamic indices that can predict fluid
responsiveness.
The aim of this study is to investigate whether the PI and PVI values at different patient
positions can predict hypotension during caesarean section.
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