Key result
BMI ≥25 predicts post-induction perfusion index changes with ~91% sensitivity, while prone positioning increases values.
Why the study?
The variability in perfusion index after anesthesia induction due to surgical positions and the influence of BMI on this variability were not well characterized.
Do overweight status and patient position changes affect the perfusion index after anesthesia induction in adult surgical patients?
Cross-Sectional (n=82)
No
Do overweight status and patient position changes affect the perfusion index after anesthesia induction in adult surgical patients?
Effect estimate: AUC 0.96 (95% CI 0.91-0.99)
p-value: p=<0.001
Patient positioning and body mass index appear to influence the perfusion index following anesthesia induction.
Overweight status and prone positioning were associated with perfusion index changes post-induction; hypothesis-generating and should not yet change anesthesia practice.
Aim: The relative variability in the perfusion index (PI) observed after anesthesia induction, due to the effect of surgical positions, is influenced by multiple factors. The aim of this study was to investigate changes in PI in patients undergoing surgery in the supine, prone, and sitting positions, and to assess the effect of body mass index (BMI) on the relative change in PI (ΔPI). Material and Methods: This is a prospective cross-sectional observational study. A total of 82 patients were enrolled between June 2023 and December 2023, including individuals over 18 years of age. The study investigated the effects of different patient positions (supine, sitting, and prone) and BMI on the relative change in perfusion index. Results: Of the patients, 52.4% were male (n = 43). It was found that 43.9% of the patients had a BMI greater than 25 kg/m² (n = 36). The operations were performed in the prone position in 32.9% of cases (n = 27), supine position in 32.9% (n = 27), and sitting position in 34.1% (n = 28). No statistically significant difference was observed in the PI value at 0 minutes across all groups. The PI values at 10, 20, and 30 minutes were highest in Group 1 patients. It was found that the PI values were statistically higher in patients with a BMI
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Duran et al. (2025) conducted a cross-sectional in Surgery under general anesthesia (n=82). Body mass index ≥ 25 kg/m² and surgical position changes vs. Body mass index < 25 kg/m² was evaluated on Prediction of relative change in perfusion index (ΔPI) after anesthesia induction by BMI ≥ 25 (AUC 0.96, 95% CI 0.91-0.99, p=<0.001). A body mass index of 25 or greater strongly predicted the relative change in perfusion index after anesthesia induction (sensitivity 91%, specificity 93%), and patients in the prone position exhibited higher perfusion index values compared to those in supine or sitting positions.
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