We present the unusual case of a 7-year-old girl with severe iron-deficiency anemia who concurrently was determined to be in a supraventricular tachycardia (SVT) rhythm. To our knowledge, the association of anemia with SVT has not been reported previously. We review the presentation of SVT, management strategies for treating both severe anemia and SVT, risks and benefits of using the classic treatments for SVT in a severely anemic patient and discuss iron-deficiency anemia-related cardiac disease.