2
|
Thibault B, Harel F, Ducharme A, White M, Ellenbogen KA, Frasure-Smith N, Roy D, Philippon F, Dorian P, Talajic M, Dubuc M, Guerra PG, Macle L, Rivard L, Andrade J, Khairy P. Cardiac Resynchronization Therapy in Patients With Heart Failure and a QRS Complex <120 Milliseconds. Circulation 2013; 127:873-81. [PMID: 23388213 DOI: 10.1161/circulationaha.112.001239] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Background—
Although the benefits of cardiac resynchronization therapy are well established in selected patients with heart failure and a prolonged QRS duration, salutary effects in patients with narrow QRS complexes remain to be demonstrated.
Methods and Results—
The Evaluation of Resynchronization Therapy for Heart Failure (LESSER-EARTH) trial is a randomized, double-blind, 12-center study that was designed to compare the effects of active and inactive cardiac resynchronization therapy in patients with severe left ventricular dysfunction and a QRS duration <120 milliseconds. The trial was interrupted prematurely by the Data Safety and Monitoring Board because of futility and safety concerns after 85 patients were randomized. Changes in exercise duration after 12 months were no different in patients with and without active cardiac resynchronization therapy (−0.7 minutes [95% confidence interval (CI), −2.9 to 1.5] versus 0.8 minutes [95% CI, −1.2 to 2.9];
P
=0.31]. Similarly, no significant differences were observed in left ventricular end-systolic volumes (−6.4 mL [95% CI, −18.8 to 5.9] versus 3.1 mL [95% CI, −9.2 to 15.5];
P
=0.28) and ejection fraction (3.3% [95% CI, 0.7–6.0] versus 2.1% [95% CI, −0.5 to 4.8];
P
=0.52). Moreover, cardiac resynchronization therapy was associated with a significant reduction in the 6-minute walk distance (−11.3 m [95% CI, −31.7 to 9.7] versus 25.3 m [95% CI, 6.1–44.5];
P
=0.01), an increase in QRS duration (40.2 milliseconds [95% CI, 34.2–46.2] versus 3.4 milliseconds [95% CI, 0.6–6.2];
P
<0.0001), and a nonsignificant trend toward an increase in heart failure–related hospitalizations (15 hospitalizations in 5 patients versus 4 hospitalizations in 4 patients).
Conclusions—
In patients with a left ventricular ejection fraction ≤35%, symptoms of heart failure, and a QRS duration <120 milliseconds, cardiac resynchronization therapy did not improve clinical outcomes or left ventricular remodeling and was associated with potential harm.
Clinical Trial Registration
URL:
http://www.clinicaltrials.gov
. Unique identifier: NCT00900549.
Collapse
Affiliation(s)
- Bernard Thibault
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - François Harel
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Anique Ducharme
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Michel White
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Kenneth A. Ellenbogen
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Nancy Frasure-Smith
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Denis Roy
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - François Philippon
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Paul Dorian
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Mario Talajic
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Marc Dubuc
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Peter G. Guerra
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Laurent Macle
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Léna Rivard
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Jason Andrade
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| | - Paul Khairy
- From the Montreal Heart Institute, Université de Montréal, Montreal, QB, Canada (B.T., F.H., A.D., M.W., N.F.-S., D.R., M.T., M.D., P.G.G., L.M., L.R., J.A., P.K.); Medical College of Virginia, Richmond (K.A.E.); Institut Universitaire de Cardiologie et Pneumologie, Université Laval, Quebec City, QC, Canada (F.P.); and St. Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada (P.D.)
| |
Collapse
|