Title Page:Title: Letter to the Editor: Intraoperative renal hypoxia and risk of cardiac surgery-associated acute kidney injuryArticle Type: Letter to the EditorCorrespondence: 1. Roomi RajaContact No: +92-3342946940. Email: [email protected]: Ziauddin University KarachiAddress: Hemilton Courts Block G-1 Flat 408 Near Teen Talwar Clifton KarachiORCID: 0000-0001-9104-3644Co-Authors: 2. Muhammad fahad AminContact No: +92-3408056755. Email: [email protected]: Ziauddin university karachiAddress: 128/2 14th street off khayaban e muhafiz phase 6 defence housing authority karachiORCID: 0000-0003-1861-5313Co-Authors: 3. Satesh KumarContact No: +92-3325252902. Email: [email protected]: Shaheed Mohtarma Benazir Bhutto Medical College Liyari, KarachiAddress: Parsa Citi Garden East, KarachiORCID: 0000-0001-7975-6297Word Count: 302