Education & Training

Medical School

Tulane University School of Medicine


Internal Medicine

  • University of Missouri School of Medicine GME

Emergency Medicine

  • Louisiana State University Medical Center-Shreveport


Cardiovascular Disease

  • University of Missouri School of Medicine GME


American Board of Internal Medicine
National Board of Echocardiography
American Board of Internal Medicine/Cardiovascular Disease


MU Health Care participates with most major managed care organizations. To find out whether MU Health Care is a participating provider in your insurance plan or network, or for information on co-payments and deductibles, please contact your insurance carrier directly.

Academic Information

Assistant Professor, Clinical Medicine


1 Hospital Drive
Columbia, MO 65212
United States

P. 573-884-3278
F. 573-884-3221

Research Interests

  • Preventive cardiology
  • Cardiovascular care for patients with cancer

Areas of Expertise

  • Cardiovascular care for patients with cancer
  • Echocardiography
  • Preventive cardiology
  • Public health
  • Tropical medicine

Awards & Honors

  • Fellow of the American College of Cardiology, 2015
  • Chief Fellow, Cardiovascular Medicine Fellowship Program, 2013-15
  • Outstanding Fellow Award, Department of Internal Medicine, 2012
  • MD/MPH Merit Scholarship, 2004-08


  • Mittal M, Aggarwal K, Littrell RL, Agrawal H, Alpert MA. Does pharmacotherapy improve cardiovascular outcomes in hemodialysis patients? Hemodial Int. 2015 Oct;19 Suppl 3:S40-50.
  • Balla S, Vasudevan A, Littrell R, Aggarwal K. Myocardial Injury After Blunt Trauma: Cardiac Magnetic Resonance Imaging and Intravascular Ultrasound to the Rescue. Circulation. 2015 Sep 1;132(9):849-51
  • Agrawal H, Aggarwal K, Littrell R, Velagapudi P, Turagam MK, Mittal M, Alpert MA. Pharmacological and non pharmacological strategies in the management of coronary artery disease and chronic kidney disease. Curr Cardiol Rev. 2015;11(3):261-9.
  • Littrell R, Flaker G. Implications for your practice: Important changes in the 2014 guideline for the management of patients with atrial fibrillation. Postgrad Med. 2015 Jun;127(5):535-8.
  • Littrell R, Alpert M, Aggarwal K. Epicardial coronary disease in chronic kidney disease. Chapter in Goldsmith et al., Cardio-renal Clinical Challenges. Springer publications.
  • Littrell R, Flaker G. Apixaban for the prevention of stroke in atrial fibrillation. Expert Rev Cardiovasc Ther. 2012 Feb;10(2):143-9.