Newly Published
Correspondence  |   May 2020
Defining Hypotension during Anesthesia: Reply
Author Notes
  • Northwestern University Feinberg School of Medicine, Chicago, Illinois. charles.hogue@nm.org
  • (Accepted for publication April 20, 2020.)
    (Accepted for publication April 20, 2020.)×
Article Information
Correspondence
Correspondence   |   May 2020
Defining Hypotension during Anesthesia: Reply
Anesthesiology Newly Published on May 28, 2020. doi:https://doi.org/10.1097/ALN.0000000000003380
Anesthesiology Newly Published on May 28, 2020. doi:https://doi.org/10.1097/ALN.0000000000003380
We wish to thank Drs. Roth1  and Gross2  for pointing out a typographical error in our recent Clinical Focus Review in Anesthesiology.3  In the next to last paragraph of that review we erroneously stated that 1.35 mmHg should subtracted from blood pressure measured at the heart level for each 1 cm of head elevation, such as with “beach chair” patient positioning. The aim of that subtraction is to obtain an estimate of the blood pressure at the Circle of Willis as widely discussed.4  We meant this sentence to read: 1 mmHg should be subtracted from the blood pressure measured at heart level for each 1.35 cm of head elevation, or more precisely, 0.74 mmHg for each 1 cm of head elevation.