Key result
Perfusion index shows a weak negative correlation with visual analog scale changes after intravenous morphine.
Why the study?
Does the perfusion index correlate with visual analog scale scores for postoperative pain assessment?
Observational (n=89)
Does the perfusion index correlate with visual analog scale scores for postoperative pain assessment?
Effect estimate: r=-0.255
p-value: p=0.016
The perfusion index shows significant changes in response to analgesia and may serve as an objective tool for assessing postoperative pain.
Weak correlation limits perfusion index adoption for pain assessment; leaves open its validation as objective VAS adjunct in larger studies.
OBJECTIVES: To evaluate the possible value of the perfusion index (PI) as a tool for pain assessment. Methods: This prospective, observational study was performed with 89 patients underwent surgery with general anesthesia. The patients with visual analog scale (VAS) greater than 3 were grouped as M1, and patients with VAS≤3 and performed morphine were grouped as M2. After surgery patients with VAS greater than 3 were given 2mg morphine. Patients with VAS greater than 3 were given increments of intravenous morphine (2 mg) at 20 minute intervals until VAS less than 3. The correlation and difference between PI and VAS score values were evaluated before and after analgesic administration. Results: Significant changes were found in both PI values and VAS scores between M1 and M2 groups (2.80±0.77, 3.97±0.94, p less than 0.001; 6.60±1.20, 2.74±0.46, p less than 0.001) Despite no correlation was found between PI values and VAS scores of M1 and M2 groups, weak negative correlation was detected between differences in PI values and VAS scores among groups (r=-0.255, p=0.016). Conclusion: Perfusion index is a parameter that can be used in the assessment of postoperative pain and responses to analgesics.
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Tapar et al. (2018) conducted an observational in Postoperative pain (n=89). Perfusion index (PI) vs. Visual analog scale (VAS) was evaluated on Correlation and difference between PI and VAS score values before and after analgesic administration (r=-0.255, p=0.016). Perfusion index values demonstrated a weak negative correlation with visual analog scale score differences (r=-0.255, p=0.016) in postoperative patients receiving intravenous morphine.
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