RT Journal Article SR Electronic T1 Systolic time interval fluctuations produced by acute myocardial infarction. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 765 OP 772 DO 10.1136/hrt.33.5.765 VO 33 IS 5 A1 J T Dowling A1 G Sloman A1 C Urquhart YR 1971 UL http://heart.bmj.com/content/33/5/765.abstract AB