The Ability of the Change in Positional Perfusion Index in Predicting Post-spinal Anesthesia Hypotension in Caesarian Section

"The study aimed to generate a model relating pre-spinal perfusion index to the likelihood and severity of the reduction in blood pressure in the first 20 min after spinal injection.~A correlation between the delta PI and the delta SBP (the difference between the baseline maternal systolic blood pressure and the lowest blood pressure)will be investigated to establish a predictive model to define cut-off values at which perfusion index variation indicated a low risk (no or mild hypotension groups) or a high risk (moderate, severe groups) of reduction in blood pressure.. The incremental change of a measure PI, the ΔPI will be calculated as the absolute change in PI between supine and sitting positions, ΔPI=PIsupine-sitting. The relative change in PI the rPI, will be expressed as the percentage of change in PI, rPI=ΔPI/PIsitting× 100."