RT Journal Article SR Electronic T1 High-fidelity, infinite time constant calibrated pressure apexcardiogram and its correlation with high-fidelity left ventricular pressure. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 194 OP 200 DO 10.1136/hrt.44.2.194 VO 44 IS 2 A1 P S Reddy A1 F Meno A1 J D O'Toole A1 E I Curtiss A1 F W Griff YR 1980 UL http://heart.bmj.com/content/44/2/194.abstract AB