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• W2959247342 abstract "We read with great interest the article by Pereira et al.1 in a recent issue of Anesthesiology. The authors explore electrical impedance tomography–based determination of an individualized positive end-expiratory pressure level to simultaneously limit both atelectasis and overdistension in mechanically ventilated patients during general anesthesia. While atelectasis is a well-recognized consequence of mechanical ventilation during general anesthesia, some authors previously considered overdistension as a non–clinically significant problem in the operating room.2 We congratulate the authors for presenting data that challenge this assumption.However, we feel that the authors omitted proper discussion of the discrepancy between their study and two other recent studies that failed to show a difference in postoperative atelectasis when assessed shortly after extubation.3,4 While Pereira et al. are to be commended for using computed tomography, the reference imaging technique, to assess the amount of atelectasis postextubation, we wonder why the authors have chosen a −200 to +100 Hounsfield units interval to define nonaerated lung. In the reference quoted to explain their methodology,5 atelectasis was defined as −100 to +100 Hounsfield units, as in numerous other publications.6–8 To rule out the possibility of a classification bias, the authors should have analyzed their results using the generally accepted reference values for both poorly aerated (−500 to −100 Hounsfield units) and nonaerated (–100 to +100 Hounsfield units) lung. Moreover, they should have reported the degree of atelectasis in square centimeters, as used in their sample size calculation, to eliminate the presumption of a reporting bias. We write to request that the authors report results both in square centimeters, as well as according to the generally accepted Hounsfield units reference values to address these potential biases.Finally, provided the aforementioned concerns are properly addressed, Pereira et al.’s work is a crucial piece of information, as the primary mechanism by which lung protective ventilation is thought to decrease postoperative pulmonary complication is through the successful decrease in postoperative atelectasis.9 The authors weaned their patients using the pressure-support mode maintaining the same intraoperative positive end-expiratory pressure level contrary to the other studies. Interestingly, weaning using assisted ventilatory modes is seldomly performed in the operating room while it is a commonly performed procedure in the intensive care unit. This cointervention might explain this trial’s observed difference in postoperative atelectasis. We would also welcome comments from the authors about their choice of weaning method.The authors declare no competing interests." @default.
• W2959247342 created "2019-07-23" @default.
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• W2959247342 date "2019-08-01" @default.
• W2959247342 modified "2023-09-25" @default.
• W2959247342 title "Individualizing Intraoperative Ventilation: Comment" @default.
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• W2959247342 doi "https://doi.org/10.1097/aln.0000000000002834" @default.
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