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      Atrial parasystole and tachycardia. Modulation and automodulation of a parasystolic focus.

      1 , , , ,
      Chest

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          Abstract

          This report deals with a patient reflecting atrial parasystole and episodes of atrial tachycardia. The P' waves during tachycardia were identical to the parasystolic P' waves. Atrial parasystole was at times regular, as revealed by a precise mathematical relationship between the interectopic intervals, and on other occasions irregular. Irregularity was due to modulation, namely electrotonic influence exerted by the sinus impulses upon the parasystolic focus. Atrial tachycardia occurred only during the periods when atrial parasystole was modulated. Atrial tachycardia has been interpreted as due to automodulation, a situation where the propagated parasystolic impulse exerts an electrotonic influence on the ectopic focus itself, leading to a marked unexpected acceleration of the ensuing parasystolic discharge.

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          Author and article information

          Journal
          Chest
          Chest
          0012-3692
          0012-3692
          Aug 1992
          : 102
          : 2
          Affiliations
          [1 ] Istituto Pluridisciplinare di Clinica Medica, Cattedra di Malattie Cardiovascolari, Università di Messina, Italy.
          Article
          S0012-3692(16)34076-4
          1643958
          fe049596-943b-41b0-b39d-acb75750584d
          History

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