title: Rejection of atrial sensing artifacts by a pacing lead with short tip-to-ring spacing.
abstract: OBJECTIVE
  The ability of a new pacing lead design, with a 10 mm tip-to-ring spacing, to facilitate rejection of sensed far field R-waves and myopotentials was evaluated.
  
  
  RESULTS
  Measurements were performed in 66 patients. The occurrence of far field R-wave sensing and myopotential sensing was determined by means of the surface ECG and the ECG markers provided by the pacemaker. At an atrial sensitivity of 0.25 mV and an atrial blanking of 50 ms far field R-wave sensing was observed in 12 patients (18.2%) and at an atrial sensitivity of 1.0 mV no far-field R-wave sensing was observed. Myopotentials were sensed in 3 patients. In all patients the measured P-wave amplitude was at least twice the estimated amplitude of the far field R-wave at an atrial blanking of 50 ms.
  
  
  CONCLUSIONS
  The results from this study show that a small tip-to-ring spacing allows for programming of a high atrial sensitivity and short atrial blanking with an acceptably low risk for atrial artifact sensing.
authors.affiliation: Department of Cardiology, The Southwest Cardiothoracic Centre, Derriford Hospital, Plymouth PL6 8DH, UK. tony@cammedcentre.demon.co.uk
authors.forename: A
authors.initials: A
authors.lastname: Nash
authors.forename: G
authors.initials: G
authors.lastname: Fröhlig
authors.forename: M
authors.initials: M
authors.lastname: Taborsky
authors.forename: E
authors.initials: E
authors.lastname: Stammwitz
authors.forename: F
authors.initials: F
authors.lastname: Maru
authors.forename: L H M
authors.initials: LH
authors.lastname: Bouwens
authors.forename: C
authors.initials: C
authors.lastname: Celiker
mesh_terms: D000368:Aged; D016477:Artifacts; D017097:Electric Impedance; D004562:Electrocardiography; D004867:Equipment Design; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006801:Humans; D008297:Male; D010138:Pacemaker, Artificial; D012680:Sensitivity and Specificity