RT Journal Article SR Electronic T1 Survival by stroke volume index in low-gradient normal EF severe aortic stenosis: insights into myocardial systolic dysfunction JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 83 OP 84 DO 10.1136/heartjnl-2014-306933 VO 101 IS 1 A1 Jonathan C L Rodrigues A1 Amardeep Ghosh Dastidar A1 Stephen Rohan A1 David H MacIver YR 2015 UL http://heart.bmj.com/content/101/1/83.2.abstract AB