RT Journal Article SR Electronic T1 Direct percutaneous left ventricular puncture JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1031 OP 1031 DO 10.1136/heart.89.9.1031 VO 89 IS 9 A1 P L Sanchez A1 E Pomerantsev A1 I F Palacios YR 2003 UL http://heart.bmj.com/content/89/9/1031.abstract AB