Increase in PI during PLR detects a positive response of the PLR test

ccforum.biomedcentral.com March 27, 2021

An increase in perfusion index (PI) during passive leg raising (PLR) by 9% accurately detects a positive response of the PLR test.

Three patients were excluded because the plethysmography signal was absent and 3 other ones because it was unstable.

Eventually, 72 patients were analysed.

In 34 patients with a positive PLR test (increase in CI ≥ 10%), cardiac index (CI) and perfusion index (PI) increased during PLR by 21 ± 10% and 54 ± 53%, respectively.

In the 38 patients with a negative PLR test, PI did not significantly change during PLR.

In 26 patients in whom volume expansion was performed, CI and PI increased by 28 ± 14% and 53 ± 63%, respectively.

In patients with acute circulatory failure, we measured PI (Radical-7) and CI (PiCCO2) before and during a PLR test and, if decided, before and after volume expansion (500-mL saline).