aDivision of Cardiovascular Medicine, Beth Israel Deaconess Medical Center

bThe Cardiogenic Shock Working Group, Tufts Medical Center, Boston, Massachusetts

cDivision of Cardiovascular Medicine, Oregon Health Sciences University Knight Cardiovascular Center, Portland, Oregon

dDepartment of Medicine

eThe Cardiovascular Center, Tufts Medical Center and Tufts University School of Medicine, Boston, Massachusetts, USA

Correspondence to Navin K. Kapur, The Cardiovascular Center, Tufts Medical Center and Tufts University School of Medicine, 800 Washington Street, Boston, MA 02116, USA. Tel: +617 636 0680; fax: +617 636 1444; e-mail: e-mail: [email protected]