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Quantification of abnormal QRS peaks predicts response to cardiac resynchronization therapy and tracks structural remodeling.
Suszko, Adrian M; Nayyar, Sachin; Porta-Sanchez, Andreu; Das, Moloy; Pinter, Arnold; Crystal, Eugene; Tomlinson, George; Dalvi, Rupin; Chauhan, Vijay S.
Afiliação
  • Suszko AM; Peter Munk Cardiac Centre, University Health Network, Toronto, ON, Canada.
  • Nayyar S; Peter Munk Cardiac Centre, University Health Network, Toronto, ON, Canada.
  • Porta-Sanchez A; Peter Munk Cardiac Centre, University Health Network, Toronto, ON, Canada.
  • Das M; Peter Munk Cardiac Centre, University Health Network, Toronto, ON, Canada.
  • Pinter A; Department of Cardiology, Freeman Hospital, Newcastle upon Tyne, United Kingdom.
  • Crystal E; Division of Cardiology, St. Michael's Hospital, Toronto, ON, Canada.
  • Tomlinson G; Cardiology Division, Sunnybrook Health Sciences Centre, Toronto, ON, Canada.
  • Dalvi R; Peter Munk Cardiac Centre, University Health Network, Toronto, ON, Canada.
  • Chauhan VS; Peter Munk Cardiac Centre, University Health Network, Toronto, ON, Canada.
PLoS One ; 14(6): e0217875, 2019.
Article em En | MEDLINE | ID: mdl-31170231
BACKGROUND: Although QRS duration (QRSd) is an important determinant of cardiac resynchronization therapy (CRT) response, non-responder rates remain high. QRS fragmentation can also reflect electrical dyssynchrony. We hypothesized that quantification of abnormal QRS peaks (QRSp) would predict CRT response. METHODS: Forty-seven CRT patients (left ventricular ejection fraction = 23±7%) were prospectively studied. Digital 12-lead ECGs were recorded during native rhythm at baseline and 6 months post-CRT. For each precordial lead, QRSp was defined as the total number of peaks detected on the unfiltered QRS minus those detected on a smoothed moving average template QRS. CRT response was defined as >5% increase in left ventricular ejection fraction post-CRT. RESULTS: Sixty-percent of patients responded to CRT. Baseline QRSd was similar in CRT responders and non-responders, and did not change post-CRT regardless of response. Baseline QRSp was greater in responders than non-responders (9.1±3.5 vs. 5.9±2.2, p = 0.001) and decreased in responders (9.2±3.6 vs. 7.9±2.8, p = 0.03) but increased in non-responders (5.5±2.3 vs. 7.5±2.8, p = 0.049) post-CRT. In multivariable analysis, QRSp was the only independent predictor of CRT response (Odds Ratio [95% Confidence Interval]: 1.5 [1.1-2.1], p = 0.01). ROC analysis revealed QRSp (area under curve = 0.80) to better discriminate response than QRSd (area under curve = 0.67). Compared to QRSd ≥150ms, QRSp ≥7 identified response with similar sensitivity but greater specificity (74 vs. 32%, p<0.05). Amongst patients with QRSd <150ms, more patients with QRSp ≥7 responded than those with QRSp <7 (75 vs. 0%, p<0.05). CONCLUSIONS: Our novel automated QRSp metric independently predicts CRT response and decreases in responders. Electrical dyssynchrony assessed by QRSp may improve CRT selection and track structural remodeling, especially in those with QRSd <150ms.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Eletrocardiografia / Terapia de Ressincronização Cardíaca Tipo de estudo: Observational_studies / Prognostic_studies / Risk_factors_studies Limite: Female / Humans / Male / Middle aged Idioma: En Ano de publicação: 2019 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Eletrocardiografia / Terapia de Ressincronização Cardíaca Tipo de estudo: Observational_studies / Prognostic_studies / Risk_factors_studies Limite: Female / Humans / Male / Middle aged Idioma: En Ano de publicação: 2019 Tipo de documento: Article