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[Effects of left bundle branch block on pulmonary vein and transmitral flow]

A V Mattioli1, E Casali, D Vivoli

  • 1Cattedra di Cardiologia, Università degli Studi, Modena.

Cardiologia (Rome, Italy)
|November 1, 1993
PubMed

Insights

Left bundle branch block (LBBB) from ventricular pacing impairs left ventricular function, altering pulmonary venous flow (PVF) and mitral flow (MF). Atrial contraction plays a more significant role in ventricular function with LBBB.

Area of Science:

  • Cardiology
  • Cardiac Electrophysiology
  • Echocardiography

Background:

  • Left ventricular function is crucial for cardiac performance.
  • Left bundle branch block (LBBB) is known to affect ventricular function.
  • Doppler evaluation of pulmonary venous flow (PVF) and mitral flow (MF) can assess left ventricular function.

Purpose of the Study:

  • To investigate the impact of LBBB induced by ventricular pacing on cardiac performance.
  • To evaluate changes in PVF and MF during LBBB.

Main Methods:

  • Transesophageal echocardiography (TEE) was performed in 10 patients with sick sinus syndrome (SSS) on permanent VDD pacing.
  • PVF and MF were assessed during sinus rhythm and ventricular pacing (inducing LBBB).

Main Results:

  • Ventricular pacing-induced LBBB increased reversal flow in pulmonary veins during atrial contraction.
  • Diastolic PVF increased during cardiac pacing.
  • Mitral flow (MF) showed prolonged deceleration time.

Conclusions:

  • LBBB induced by ventricular pacing is associated with reduced left ventricular function.
  • Atrial contraction contributes more significantly to ventricular function in the presence of LBBB.

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