• Hong Liu, Yi-Jin Hu, Si-Qiang Zheng, Tao Chen, Zhi-Hua Zeng, Dong-Dong Wu, Shuang Zhao, Bin Zeng, Zhi-Gang Liu, Yong-Feng Shao, and TedaICH Cardiovascular Discovery Group.
• Department of Cardiovascular Surgery, the First Affiliated Hospital of Nanjing Medical University, Nanjing, P. R. China; Department of Cardiovascular Surgery, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, P. R. China. Electronic address: dr.hongliu@foxmail.com.
• J. Thorac. Cardiovasc. Surg. 2021 Jun 1; 161 (6): 2180-2190.

ObjectiveTo examine the altitude differences in the optimal perfusate oxygenation (PpO2) in patients who underwent cardiac surgery.MethodsWe included children (aged 1 month to 18 years) with congenital heart diseases surgically repaired between 2012 and 2018. We included only patients who underwent cardiac surgery with arrested heart cardiopulmonary bypass. Primary outcome was severe systemic inflammatory response syndrome (SIRS). Logistic regression was used to evaluate the association between arterial PpO2 on continuous and categorical scales and severe SIRS by altitude. We established PpO2 thresholds that equated to a risk probability of roughly 0.185 or greater for developing severe SIRS in each group of altitude.ResultsAmong 3918 patients from low altitudes and 2384 from high altitudes, high-altitude patients were older (median, 42.3 [interquartile range 22.8-75.8] vs 37.1 [17.7-69.1] months, P < .001) and had lower arterial PpO2 (289 [237-342] vs 301 [246-362] mm Hg, P < .001). Greater PpO2 was associated with increased risk of severe SIRS overall (adjusted odds ratio, 1.221 [95% confidence interval, 1.167-1.278] per standard deviation increase), with a stronger monotonic associations for low-altitude patients than for high-altitude patients (adjusted odds ratio, 1.302 [95% confidence interval, 1.229-1.379] vs adjusted odds ratio, 1.083 [95% confidence interval, 1.003-1.170] per standard deviation increase) (Pinteraction = .0003). A PpO2 level of 310 mm Hg identified low-altitude patients with a risk probability of roughly 0.185 or greater of severe SIRS, whereas the cutoffs ranged from 200 mm Hg to 325 mm Hg for high-altitude patients.ConclusionsThis study suggests altitude differences in the association of arterial PpO2 with inflammatory response following pediatric cardiac surgery.Copyright © 2020 The American Association for Thoracic Surgery. Published by Elsevier Inc. All rights reserved.

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