title: Myopotential inhibition of demand pacemakers.
abstract: Two patients are described in whom skeletal muscle potentials originating in the shoulder girdle muscles during isometric movement suppressed the discharge of a ventricular demand unipolar pacemaker, resulting in syncope. Converting the pulse generator into a fixed-rate mode with the magnet prevented the inhibition. Improved filters or wider use of bipolar electrodes should prevent this form of interference.
authors.affiliation: Pacemaker Telemetry Center, Texas Heart Institute, St. Luke's Episcopal Hospital, Houston, Texas 77225, USA.
authors.forename: A V
authors.initials: AV
authors.lastname: Lazar
authors.forename: M J
authors.initials: MJ
authors.lastname: Mihalick
authors.forename: S A
authors.initials: SA
authors.lastname: De Young
authors.forename: R J
authors.initials: RJ
authors.lastname: Hall