Anesthesia and Analgesia: Regional AnalgesiaPhotoplethysmographic Evaluation of Sympathectomy During Lumbar Epidural Analgesia: A Randomized Comparison of 0.125% Ropivacaine and 0.125% LevobupivacaineReiner, K.; Lukic, A.; Martinus, M.; Cacic, M.; Mihaljevic, S.Author Information Department of Anesthesiology and Intensive Care Medicine, Clinic for Obstetrics and Gynecology, University Clinical Hospital Center Zagreb, Zagreb, Croatia Obstetric Anesthesia Digest: December 2019 - Volume 39 - Issue 4 - p 218-219 doi: 10.1097/01.aoa.0000603816.98675.33 Buy Metrics Abstract (Acta Anaesthesiol Scand. 2019;63(6):775–780) The method of photoplethysmography measures blood flow in the skin through the use of infrared light to gage nervous system activity during both peripheral and central anesthesia blocks. Experts today believe that ropivacaine and levobupivacaine carry varying levels of cardiovascular safety, with ropivacaine being less dangerous, despite a lack of data supporting this opinion. These investigators hypothesized that these 2 local anesthetics actually carry the same cardiovascular safety risk, and aimed to measure the effects of both ropivacaine and levobupivacaine using photoplethysmography. Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.