TY - RPRT TI - Pacemaker syndrome in activity-responsive VVI pacing. AU - H P Liebert AU - S O'Donoghue AU - W F Tullner AU - E V Platia PY - 1989 DO - 10.1016/0002-9149(89)90671-1 UR - https://pubmed.ncbi.nlm.nih.gov/2741806/ ID - 2741806 ER -