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Effects of a Blocked Atrial Beat on the Atrioventricular Nodal Recovery Property in Patients with Dual Nodal Pathways.

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Title: Effects of a Blocked Atrial Beat on the Atrioventricular Nodal Recovery Property in Patients with Dual Nodal Pathways.
Authors: LEE, PI‐CHANG1 (AUTHOR), WU, JING‐MING2 (AUTHOR), WOLFF, GRACE S.3 (AUTHOR), YOUNG, MING‐LON3 (AUTHOR)
Source: Pacing & Clinical Electrophysiology. Nov2003, Vol. 26 Issue 11, p2091-2095. 5p.
Subjects: Atrioventricular node, Electrophysiology, Heart conduction system, Heart block, Heart diseases
Abstract: LEE, P.-C., et al.: Effects of a Blocked Atrial Beat on the Atrioventricular Nodal Recovery Property in Patients with Dual Nodal Pathways. Dual AVN physiology can be demonstrated by a variety of maneuvers. To determine whether AVN recovery times following a blocked extrastimulus facilitate or obscure detection of dual AVN physiology, 11 patients (9–17 years) were studied with dual AVN pathways by using single and double atrial extrastimuli. With a single atrial extrastimuli, the premature atrial stimulus (A2) was coupled to basic atrial beats (A1). The fast and slow AVN recovery curves were constructed with plots of the nodal conduction time against the recovery time (A1A2,A2H2). With double atrial extrastimuli, a fixed blocked A2 beat (A2B) was followed by a scanning atrial beat (A3). The nodal recovery property post-A2B was studied by plots of A2BA3,A3H3. In all patients the recovery curve of the fast pathway post-A2B had a leftward shift when compared to that of the pre-A2B curve (i.e., the AH was shortened at the same recovery time). The window of slow pathway conduction post-A2B disappeared totally in five patients and decreased significatly in six patients (post-A2B: 26 ± 42 ms; pre-A2B: 80 ± 65 ms, P < 0.05). In the six patients that still had slow pathway conduction post-A2B, the slow pathway effective refractory period post-A2B was significantly less than that of pre-A2B (215 ± 38 vs 268 ± 16 ms, P < 0.05). The fast pathway effective refractory period post-A2B was also diminished significantly (235 ± 62 vs 357 ± 76 ms, P < 0.0001). The authors conclude that blocked atrial beats decrease the visibility of the slow pathway conduction. (PACE 2003; 26:2091–2095) [ABSTRACT FROM AUTHOR]
Copyright of Pacing & Clinical Electrophysiology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Effects of a Blocked Atrial Beat on the Atrioventricular Nodal Recovery Property in Patients with Dual Nodal Pathways.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Pacing+%26+Clinical+Electrophysiology%22&quot;&gt;Pacing &amp; Clinical Electrophysiology&lt;/searchLink&gt;. Nov2003, Vol. 26 Issue 11, p2091-2095. 5p.
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  Data: LEE, P.-C., et al.: Effects of a Blocked Atrial Beat on the Atrioventricular Nodal Recovery Property in Patients with Dual Nodal Pathways. Dual AVN physiology can be demonstrated by a variety of maneuvers. To determine whether AVN recovery times following a blocked extrastimulus facilitate or obscure detection of dual AVN physiology, 11 patients (9–17 years) were studied with dual AVN pathways by using single and double atrial extrastimuli. With a single atrial extrastimuli, the premature atrial stimulus (A2) was coupled to basic atrial beats (A1). The fast and slow AVN recovery curves were constructed with plots of the nodal conduction time against the recovery time (A1A2,A2H2). With double atrial extrastimuli, a fixed blocked A2 beat (A2B) was followed by a scanning atrial beat (A3). The nodal recovery property post-A2B was studied by plots of A2BA3,A3H3. In all patients the recovery curve of the fast pathway post-A2B had a leftward shift when compared to that of the pre-A2B curve (i.e., the AH was shortened at the same recovery time). The window of slow pathway conduction post-A2B disappeared totally in five patients and decreased significatly in six patients (post-A2B: 26 &#177; 42 ms; pre-A2B: 80 &#177; 65 ms, P &lt; 0.05). In the six patients that still had slow pathway conduction post-A2B, the slow pathway effective refractory period post-A2B was significantly less than that of pre-A2B (215 &#177; 38 vs 268 &#177; 16 ms, P &lt; 0.05). The fast pathway effective refractory period post-A2B was also diminished significantly (235 &#177; 62 vs 357 &#177; 76 ms, P &lt; 0.0001). The authors conclude that blocked atrial beats decrease the visibility of the slow pathway conduction. (PACE 2003; 26:2091–2095) [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: &lt;i&gt;Copyright of Pacing &amp; Clinical Electrophysiology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1046/j.1460-9592.2003.00325.x
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 5
        StartPage: 2091
    Subjects:
      – SubjectFull: Atrioventricular node
        Type: general
      – SubjectFull: Electrophysiology
        Type: general
      – SubjectFull: Heart conduction system
        Type: general
      – SubjectFull: Heart block
        Type: general
      – SubjectFull: Heart diseases
        Type: general
    Titles:
      – TitleFull: Effects of a Blocked Atrial Beat on the Atrioventricular Nodal Recovery Property in Patients with Dual Nodal Pathways.
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            NameFull: LEE, PI‐CHANG
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            NameFull: WU, JING‐MING
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            NameFull: WOLFF, GRACE S.
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            NameFull: YOUNG, MING‐LON
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            – D: 01
              M: 11
              Text: Nov2003
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              Y: 2003
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              Value: 26
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              Value: 11
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            – TitleFull: Pacing & Clinical Electrophysiology
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