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Abstract Objective To evaluate the effects of cardiac resynchronization therapy(CRT) on patients with heart failure (HF) and right bundle branch block (RBBB). Methods Left ventricular size, left ventricular ejection fraction, mitral regurgitation, the synchronicity of interventricular and left ventricular contractions were measured by echocardiography before and 6 months later after CRT in 16 patients with HF and RBBB. Results Left ventricular end systolic diameter, end diastolic diameter, LVPT- RVPT and TS- SD- 12 decreased significantly from(54.8±6.4)mm, (63.4±8.2)mm, (41.4± 10.5)ms and (52.7±11.2)ms before to (43.2±4.5)mm, (54.1±5.8)mm, (23.7±8.2)ms and (31.5±9.7)ms at 6 months after CRT, respectively, in 13 patients (P<0.05 or 0.01). These parameters were not improved in another 3 patients. Conclusion CRT may be beneficial to some patients with HF and RBBB.
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