Antimicrobial ReportsBedaquiline and Delamanid in Children With XDR Tuberculosis What is prolonged QTc?Shah, Ira MD, DPID; Gandhi, Srushti MBBS, DCH; Shetty, Naman S. MBBSAuthor Information From the Pediatric TB Clinic, Department of Pediatric Infectious Diseases, B J Wadia Hospital for Children, Mumbai, India. Accepted for publication January 7, 2020. The authors have no funding or conflicts of interest to disclose. Address for correspondence: Ira Shah, MD, 1/B Saguna, 271/B St Francis Road, Vile Parle (W), Mumbai 400056, India. Email: firstname.lastname@example.org. The Pediatric Infectious Disease Journal: June 2020 - Volume 39 - Issue 6 - p 512-513 doi: 10.1097/INF.0000000000002601 Buy Metrics Abstract Bedaquiline and delamanid used to treat extensively drug-resistant tuberculosis are known to cause prolonged QTc. Two children with extensively drug-resistant tuberculosis were put on bedaquiline and delamanid and had prolonged QTc on the Bazett formula but normal QTc by the Fridericia formula. Both had no adverse effects. Correct formula for monitoring QTc should be used thereby preventing unnecessary withholding of medicines. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.