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Prognostic Impact of QRS Axis Deviation in Patients Treated With Cardiac Resynchronization Therapy
Author(s) -
PERROTTA LAURA,
KANDALA JAGDESH,
BIASE LUIGI,
VALLEGGI ALESSANDRO,
MICHELOTTI FEDERICA,
PIERAGNOLI PAOLO,
RICCIARDI GIUSEPPE,
MASCIOLI GIOSUÈ,
LAKKIREDDY DHANUNJAYA,
PILLARISETTI JAYASREE,
EMDIN MICHELE,
NATALE ANDREA,
SINGH JAGMEET P.,
PADELETTI LUIGI
Publication year - 2016
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1111/jce.12887
Subject(s) - medicine , cardiac resynchronization therapy , qrs complex , cardiology , heart failure , left axis deviation , ejection fraction
Prognosis of QRS Axis Deviation in CRT‐D Introduction QRS duration and morphology are currently recognized as recommended criteria for the selection of CRT candidates. It has recently been shown that patients with left bundle branch block (LBBB) derive substantial clinical benefit from CRT. The aim of this study is to investigate the prognostic impact of QRS axis deviation (AD) in HF patients with LBBB undergoing CRT. Methods and Results We retrospectively evaluated 707 HF patients with LBBB who underwent CRT at five centers. Baseline QRS axis was defined as normal (NA: –30° to 90°), right axis deviation (RAD: 90° to 180°) and left axis deviation (LAD: <−30°). The primary endpoint was a composite of all cause death/HF hospitalization. The risk of endpoint by AD was evaluated with both Kaplan–Meier and Cox proportional hazard analysis. Among 707 patients (73% M, median age: 71 [62,77] years), 323 (46%) had NA, 359 (51%) LAD, and 25 (3.5%) RAD. Baseline clinical characteristics were similar between the three groups. Over a mean follow‐up of 32 ± 25 months, 141 deaths occurred (21%) and 36% (n = 255) met with the composite endpoint. A significantly higher proportion of RAD patients (52%) reached the endpoint (LAD 40%, NA 30%). KM analysis showed that RAD and LAD patients had worse event free survival and in multivariate analysis both LAD (HR: 1.40; 95% CI: 1.05–1.86; P = 0.021) and RAD (HR: 2.49; 95% CI: 1.31–4.74; P = 0.005) were independently associated with worse clinical outcome. Conclusions Right or left axis deviation in the presence of LBBB in HF patients undergoing CRT are independent predictors of poor prognosis.