In double inlet left ventricle only the left lower heart chamber (left ventricle) is developed, and both upper chambers carry blood into this ventricle. A small, poorly developed right ventricle may be present. Double inlet left ventricle is one of several heart defects known as single (or common) ventricle defects, as there is essentially only one pumping chamber in the heart.
Review Date 7/7/2020
Updated by: Thomas S. Metkus, MD, Assistant Professor of Medicine and Surgery, Johns Hopkins University School of Medicine, Baltimore, MD. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.