• Ryota Watanabe, Koichi Suehiro, Akira Mukai, Katsuaki Tanaka, Tokuhiro Yamada, Takashi Mori, and Kiyonobu Nishikawa.
• Department of Anesthesiology, Osaka City University Graduate School of Medicine, 1-5-7 Asahimachi, Abeno-ku, Osaka, 545-8586, Japan.
• BMC Anesthesiol. 2021 Dec 2; 21 (1): 303.

BackgroundThe present study aimed to evaluate the reliability of hemodynamic changes induced by lung recruitment maneuver (LRM) in predicting stroke volume (SV) increase after fluid loading (FL) in prone position.MethodsThirty patients undergoing spine surgery in prone position were enrolled. Lung-protective ventilation (tidal volume, 6-7 mL/kg; positive end-expiratory pressure, 5 cmH2O) was provided to all patients. LRM (30 cmH2O for 30 s) was performed. Hemodynamic variables including mean arterial pressure (MAP), heart rate, SV, SV variation (SVV), and pulse pressure variation (PPV) were simultaneously recorded before, during, and at 5 min after LRM and after FL (250 mL in 10 min). Receiver operating characteristic curves were generated to evaluate the predictability of SVV, PPV, and SV decrease by LRM (ΔSVLRM) for SV responders (SV increase after FL > 10%). The gray zone approach was applied for ΔSVLRM.ResultsAreas under the curve (AUCs) for ΔSVLRM, SVV, and PPV to predict SV responders were 0.778 (95% confidence interval: 0.590-0.909), 0.563 (0.371-0.743), and 0.502 (0.315-0.689), respectively. The optimal threshold for ΔSVLRM was 30% (sensitivity, 92.3%; specificity, 70.6%). With the gray zone approach, the inconclusive values ranged 25 to 75% for ΔSVLRM (including 50% of enrolled patients).ConclusionIn prone position, LRM-induced SV decrease predicted SV increase after FL with higher reliability than traditional dynamic indices. On the other hand, considering the relatively large gray zone in this study, future research is needed to further improve the clinical significance.Trial RegistrationUMIN Clinical Trial Registry UMIN000027966 . Registered 28th June 2017.© 2021. The Author(s).

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