An active fixation quadripolar left ventricular lead for cardiac resynchronization therapy with reduced postoperative complication rates by Robertson, C, Duffey, O, Tang, P-T, Fairhurst, N, Monteiro, C, Green, P, Grogono, J, Davies, M, Lewis, A, Wijesurendra, R, Ormerod, J, Gamble, J, Ginks, M, Rajappan, K, Bashir, Y, Betts, TR, Herring, N