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Anatomic description of Bachmann’s Bundle and its relation to the atrial septum

      Jean George Bachmann, in 1916, reported in The American Journal of Physiology on the auricular time intervals in 12 dog experiments.
      • Bachmann J.G.
      The interauricular time interval.
      Bachmann hypothesized that in view of the solidarity of the auricles, a special structure may exist whose special function would be that of interauricular conduction. He described a band of muscle tissue stretching from the right auricle to the base of the left atrial appendage, acknowledging that Lewis et al
      • Lewis T.
      • Meakins J.
      • White P.D.
      The excitatory process in the dog’s heart. Part I. The auricles.
      had made similar observations 2 years earlier, describing it as the interauricular band. With time, this band of tissue became known as Bachmann’s bundle (BB). There are relatively few specific anatomic studies of BB.
      • Papez J.W.
      Heart musculature of the atria.
      ,
      • James T.N.
      The connecting pathways between the sinus node and A-V node and between the right and the left atrium in the human heart.
      ,
      • Ho S.Y.
      • Sanchez-Quintana D.
      • Cabrera J.A.
      • Anderson R.H.
      Anatomy of the left atrium implications for radiofrequency ablation of atrial fibrillation.
      ,
      • Wang K.
      • Ho S.Y.
      • Gibson D.G.
      • Anderson R.H.
      Architecture of atrial musculature in humans.
      ,
      • Ho S.Y.
      • Sanchez-Quintana D.
      Structure of the left atrium.
      Recently, high-resolution optical mapping in sheep
      • Mansour M.
      • Mandapati R.
      • Berenfeld O.
      • Chen J.
      • Samie F.H.
      • Jalife J.
      Left-to-right gradient of atrial frequencies during acute atrial fibrillation in the isolated sheep heart.
      and endocardial–epicardial mapping in dogs
      • Derakhchan K.
      • Li D.
      • Courtemanche M.
      • Smith B.
      • Brouillette J.
      • Pagé P.L.
      • Nattel S.
      Method for simultaneous epicardial and endocardial mapping of in vivo canine heart application to atrial conduction properties and arrhythmia mechanisms.
      further supported previous work
      • Allessie M.A.
      • Lammers W.J.E.P.
      • Bonke F.I.M.
      • Hollen J.
      Experimental evaluation of Moe’s multiple wavelet hypothesis of atrial fibrillation.
      ,
      • Schuessler R.B.
      • Boineau J.P.
      • Bromberg B.I.
      • Hand D.E.
      • Yamauchi S.
      • Cox J.L.
      Normal and abnormal activation of the atrium.
      on the importance of BB in the pathogenesis of atrial fibrillation. Clinical electrophysiologic reports using nonfluoroscopic mapping have demonstrated that BB provides the most important interatrial conduction pathway and may play a role in sustaining atrial fibrillation.
      • Roithinger F.X.
      • Cheng J.
      • SippensGroenewegen A.
      • Lee R.J.
      • Saxon L.A.
      • Scheinman M.M.
      • Lesh M.D.
      Use of electroanatomic mapping to delineate transseptal atrial conduction in humans.
      ,
      • Schilling R.J.
      • Kadish A.H.
      • Peters N.S.
      • Goldberger J.
      • Davies W.
      Endocardial mapping of atrial fibrillation in the human right atrium using a noncontact catheter.
      In view of the renewed interest and potential importance for interventions, we performed a detailed anatomic investigation of BB in human heart specimens.
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