title: Monophasic action potential mapping in swine and humans using modified-tip ablation catheter and electroanatomic mapping system.
abstract: OBJECTIVE
  To evaluate the feasibility of monophasic action potential (MAP) mapping using a modified-tip NaviStar catheter in swine and humans.
  
  
  METHODS
  MAP mapping was performed using the modified-tip catheter at 71 +/- 21 atrial and 60 +/- 16 ventricular sites in 10 healthy pigs and at 56 ventricular sites in one patient, and using an ordinary Navi-Star catheter at 30 atrial sites in one patient and 50 +/- 14 ventricular sites in four patients. In an additional 20 patients, MAPs were also recorded at 9 +/- 2 atrial sites using the modified-tip catheter or at 12 +/- 9 atrial sites using the ordinary catheter.
  
  
  RESULTS
  In pigs, the plateau amplitudes of the MAPs recorded using the modified-tip catheter were 4.1 +/- 3.2 mV for the atrial and 9.5 +/- 4.3 mV for the ventricular MAPs. In patients, both the ventricular and atrial MAPs recorded using the modified-tip catheter were significantly higher than using the ordinary catheters, 15.7 +/- 8 and 3.0 +/- 0.9 mV vs 9.5 +/- 3.9 and 2.0 +/- 0.6 mV for the ventricular and atrial MAPs, respectively (p < 0.0001). The baseline disturbances were <10% of the MAP amplitude in 95% of the pig and 96% of the patient MAPs.
  
  
  CONCLUSIONS
  A modified-tip Navi-Star catheter could be used in swine and in humans for prompt recording of MAPs with acceptable amplitudes and baselines. MAP mapping using the modified-tip catheter is safe and feasible for clinical use.
authors.affiliation: Department of Cardiology, University Hospital, Lund, Sweden. Shiwen.Yuan@kard.lu.se
authors.forename: Shaowen
authors.initials: S
authors.lastname: Liu
authors.forename: Shiwen
authors.initials: S
authors.lastname: Yuan
authors.forename: Eva
authors.initials: E
authors.lastname: Hertervig
authors.forename: Ole
authors.initials: O
authors.lastname: Kongstad
authors.forename: Magnus
authors.initials: M
authors.lastname: Holm
authors.forename: Edgars
authors.initials: E
authors.lastname: Grins
authors.forename: S Bertil
authors.initials: SB
authors.lastname: Olsson
mesh_terms: D000200:Action Potentials; D000293:Adolescent; D000328:Adult; D000368:Aged; D000818:Animals; D001145:Arrhythmias, Cardiac / Q000503:physiopathology; D018780:Body Surface Potential Mapping / Q000295:instrumentation / Q000379:methods*; D017115:Catheter Ablation / Q000295:instrumentation*; D002404:Catheterization; D022062:Electrophysiologic Techniques, Cardiac; D005240:Feasibility Studies; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D013552:Swine