[Time course of changes in left ventricular twist in the presence of idiopathic left bundle branch block during exercise testing].

Aim: To investigate left ventricular (LV) deformation properties, rotation, and twist during a bicycle ergometer exercise test among patients with idiopathic left bundle branch block (LBBB).

Subjects And Methods: Thirty-four patients with idiopathic LBBB having a mean QRS duration of 153±24 msec were examined. A control group included 18 apparently healthy volunteers.

[LEFT HIS BUNDLE BRANCH BLOCK ASSOCIATED WITH LEFT VENTRICULAR TORSION AND REDUCED EJECTION FRACTION].

The influence of left His bundle branch block (LBBB) on left ventricular (LV) torsion in patients with cardiomyopathy remains to be elucidated. The aim of this study was to evaluate LV torsion associated with LBBB and hemodynamic consequences of possible changes. We studied 64 patients with ischemic and dilatation cardiomyopathy (LV ejection fraction less than 40%) divided into 2 groups, with narrow and middle (153 ms) duration QRS complexes.