In Reply We thank the letter writers for their comments regarding our article, “Effect of Targeting Mean Arterial Pressure During Cardiopulmonary Bypass by Monitoring Cerebral Autoregulation on Postsurgical Delirium Among Older Patients: A Nested Randomized Clinical Trial.”1 We recognize that this is a small single-center study with limitations. The methods used to characterize autoregulation in this particular study can be labor intensive and the data subject to interpretation. There were some differences between groups in perioperative characteristics, including obstructive sleep apnea and temperature management. For all of these reasons and more, we tried to be tempered in our conclusions, in particular stating that “these results should be considered preliminary and need to be confirmed in a broad population.”1