• Luping Wang, Hao Yang, Yisong Cheng, Xin Fu, Hua Yao, Xiaodong Jin, Yan Kang, and Qin Wu.
• Department of Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, China.
• Nutrition. 2022 Apr 1; 96: 111586.

ObjectivesThe aim of this study was to compare the predictive ability of the norepinephrine dose (NE), norepinephrine equivalent dose (NEQ), and mean arterial pressure (MAP)/NEQ index to predict the optimal time to initiate enteral nutrition in patients with shock on vasopressors.MethodsWe prospectively enrolled patients with shock who were receiving vasopressors and followed them for ≤28 d after enrollment. Patients who developed feeding intolerance (FI) during the follow-up period were allocated to the FI group and the remaining patients were allocated to the non-feeding intolerance (non-FI) group. The primary outcome was FI occurrence. The receiving operating characteristic curve (ROC) was used to evaluate the thresholds and predictive ability of NE, NEQ, and the MAP/NEQ index to predict FI.ResultsOf the 66 patients enrolled, 47 developed FI. The MAP/NEQ index showed good predictive ability 6 h before EN initiation. The threshold of the MAP/NEQ index for predicting FI was 417 mmHg·μg·kg·min-1 (specificity: 52.9%, sensitivity: 81%) with an area under the ROC curve (AUC) of 70.3% (95% confidence interval [CI], 55.1-85.5; P = 0.015). The threshold for the NE was 0.2 μg·kg/min-1 (specificity: 47.1%, sensitivity: 88.1%), with an AUC of 65.3% (95% CI, 48.2-82.5; P = 0.067), and that for the NEQ was 0.2 μg·kg/min-1 (specificity: 47.1%, sensitivity: 88.1%), with an AUC of 66.2% (95% CI, 49.3-83; P = 0.053).ConclusionsCompared with the NE and NEQ, it could be possible with the MAP/NEQ index to distinguish earlier whether patients with shock receiving vasopressors were suitable for initiation of EN, thereby avoiding FI.Copyright © 2022 The Author(s). Published by Elsevier Inc. All rights reserved.

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