Effects of an Isolated Complete Right Bundle Branch Block on Mechanical Ventricular Function.

Area of Science:

• Cardiology
• Cardiac Electrophysiology
• Echocardiography

Background:

• Right bundle branch block (RBBB) is a common cardiac condition.
• The impact of isolated RBBB on ventricular mechanics requires further investigation.

Purpose of the Study:

• To evaluate the effects of isolated complete RBBB on mechanical ventricular function.
• To assess changes in right ventricular (RV) morphology and performance.

Main Methods:

• Compared 98 patients with isolated complete RBBB to 92 healthy controls.
• Utilized 2D echocardiography to measure RV dimensions and fractional area change.
• Employed pulsed wave tissue Doppler imaging to assess RV systolic and diastolic velocities and timing parameters.

Main Results:

• Patients with RBBB exhibited significantly larger RV end-diastolic and end-systolic dimensions.
• RV systolic function, assessed by fractional area change, showed no significant difference between groups.
• Impaired RV diastolic function and prolonged electromechanical delay were observed in the RBBB group, indicated by decreased peak velocities and increased Tei index.

Conclusions:

• Isolated complete RBBB leads to impaired RV systolic and diastolic function.
• RV dilation occurs in patients with isolated complete RBBB.
• Long-term follow-up is necessary for patients with isolated complete RBBB.