Left atrial function in left bundle branch block: volumetric measurements of its function

Abstract

Introduction:The aim of this study was to analyze the function of left atrium (LA) 1 in patients with left bundle branch block (LBBB). Patients and Methods:20 patients without verified cardiovascular disease and 20 with LBBB were examined for left ventricular (LV) and LA function quantification. Results:We obtained lower values of EF of LV, 38.33% in patients with LBBB, against 60.81% in patients without LBBB ( Table 1). The global systolic strain of LV in patients without LBBB was 18.50% against 11.80% of the group with LBBB. The global circumferential strain of LV in patients without LBBB was 30.86% compared to 26.57% in patients with LBBB. EF of LA was 69.9% in patients without LBBB compared to 71.38% in patients with LBBB. The endsystolic volume of LA (ESVLA) in patients without LBBB was 30.1 ml/m 2 compared to 45.5 ml/m 2 in patients with LBBB. The enddiastolic volume of LA (EDVLA) in patients without LBBB was 6.5 ml/m 2 compared to 12.53 ml/m 2 in patients with LBBB. LA function timing intervals, expressed through dV/dT of early diastolic atrial emptying volume (EDAEV) in patients without LBBB was 221.5 ml/ m 2 compared to 95.46 ml/m 2 in patients with LBBB, whereas dV/dT of atrial contraction emptying volume (ACEV) in patients without LBBB was 135.8 ml/m 2 compared to 203.46 ml/ m 2 in patients with LBBB. The dV/dt of EDAEV and ACEV ratio is 1.63 in patient without LBBB against 0.46 in patients with LBBB. EDAEV in patients without LBBB was 20.66 ml compared to 9.23 ml in patients with LBBB, whereas the ACEV for the group without LBBB was 10 ml compared to 23.84 ml for the group with LBBB. The EDAEV/ACEV ratio for patients without LBBB was 2.1 compared to 0,4 for the group with LBBB. The systolic expansion time of LA (SET) was 333.33 msec vs 504.76 msec of subjects with LBBB, whereas the RR interval (msec) in patients without LBBB was 780 msec against 744.53 msec in patients with LBBB. The ratio between the LA (SET) and the RR interval (SET/RR interval index) for the group without LBBB was 0.42 against 0.69 for the group with LBBB.