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Paced P-wave duration as a significant predictor for atrial high-rate episodes in patients with cardiac implantable electronic devices
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  • Jose Manuel Rubio,
  • Alberto Sánchez Arjona,
  • Camila García-Talavera,
  • Loreto Bravo Calero,
  • Carla Lázaro Rivera,
  • Francisco Díaz Cortegana,
  • José Tuñón,
  • Adrian Baranchuk
Jose Manuel Rubio
Hospital Universitario Fundacion Jimenez Diaz

Corresponding Author:[email protected]

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Alberto Sánchez Arjona
Hospital Universitario Fundacion Jimenez Diaz
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Camila García-Talavera
Hospital Universitario Fundacion Jimenez Diaz
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Loreto Bravo Calero
Hospital Universitario Fundacion Jimenez Diaz
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Carla Lázaro Rivera
Hospital Universitario Fundacion Jimenez Diaz
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Francisco Díaz Cortegana
Hospital Universitario Fundacion Jimenez Diaz
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José Tuñón
Hospital Universitario Fundacion Jimenez Diaz
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Adrian Baranchuk
Kingston Health Sciences Centre
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Abstract

Introduction: Atrial pacing can unmask or aggravate a preexisting interatrial block (IAB). Our study aimed to determine whether atrial pacing is associated with the development of atrial high-rate episodes (AHRE) during follow-up. Methods and Results: Patients with dual-chamber cardiac implantable electronic devices (CIED), no previous documented atrial fibrillation, and with a 6-month minimum follow-up were included. In all patients, sinus and paced P-wave duration was measured. AHRE was defined as an episode of atrial rate ≥ 225 bpm with a minimum duration of 5 min, excluding those documented during the first three months after implantation. Two hundred twenty patients were included (75 ± 10 years, 61% male). After a mean follow-up of 59±25 months, 46% of patients presented AHRE. Mean paced P-wave duration was significantly longer than the sinus P-wave duration (154±27 vs 115±18 ms; p < 0.001). Sinus and paced P-waves were significantly longer in those who developed AHRE (sinus: 119±20 vs 112±16; p = 0.006; paced: 161±29 vs 148±23; p < 0.001). A paced P-wave ≥160 ms was the best predictor of AHRE, especially those lasting >24 h (OR 4.2 (95% CI) [1.6-11.4]; p = 0.004). Conclusion: Atrial pacing significantly prolongs P-wave duration and is associated with further development of AHRE. A paced P-wave ≥160 ms is a strong predictor of AHRE and should be taken into consideration as a new definition of IAB in the presence of atrial pacing.