The Cardiac Resynchronization Therapy in Patients with Heart Failure and Narrow QRS (RethinQ) study was a double-blind clinical trial evaluating the efficacy of CRT in patients with a standard ...

The current study is part of a broad effort to identify further markers that will sharpen the ... Size Might Matter for CRT to Work in Narrow-QRS Heart Failure - Medscape - Jun 12, 2018 ...

June 18, 2012 (Nice, France) — The value of cardiac resynchronization therapy (CRT) for patients with a QRS between 120 and 150 ms remains a major source of controversy among the experts [1 ...

In NARROW-CRT, Carmine Muto and colleagues randomized 120 ischemic heart failure patients with echo evidence of dyssynchrony and a QRS < 120 ms to either a CRT device or a dual chamber ICD.

The ECG of a biventricular pacemaker takes on a "fusion" and more narrow QRS complex (although still somewhat wide) with an upright QRS complex in V1 similar to a right bundle branch block pattern.

Cardiac-resynchronization therapy (CRT) reduces morbidity and mortality in chronic systolic heart failure with a wide QRS complex. Mechanical dyssynchrony also occurs in patients with a narrow QRS ...