Dan Mullany1, Kiran Shekar2, David Platts3, John Fraser2. 1. Critical Care Research Group, Adult Intensive Care Services, The Prince Charles Hospital and The University of Queensland, Brisbane, Queensland, Australia. Electronic address: daniel.mullany@health.qld.gov.au. 2. Critical Care Research Group, Adult Intensive Care Services, The Prince Charles Hospital and The University of Queensland, Brisbane, Queensland, Australia. 3. Queensland Advanced Heart Failure and Cardiac Transplant Unit, Department of Echocardiography, The Prince Charles Hospital School of Medicine, University of Queensland.