Title: Changes of ventricular function in patients with complete right bundle branch block
Abstract: Objective To investigate changes of ventricular function in patients with complete right bundle branch block(CRBBB). Methods Systolic and diastolic velocity and time interval were measured by pulsed wave tissue Doppler imaging(PW-TDI)on 48 CRBBB patients without structural heart diseases and 42 normal adults. Results ①Systole peak velocity(Sm), peak velocity of the early relaxation wave(Em), Em/ peak velocity of the later relaxation wave(Am)ratio of the basal segments of right ventricular lateral wall(RVLW) in CRBBB patients significantly decreased compared with those in controls(13.7±2.53 cm/s vs 17.00±3.10 cm/s; 12.1±2.06 cm/s vs 21.05±4.23 cm/s; 0.71±0.38 cm/s vs 1.22±0.65 cm/s ,P0.01). Am of basic segment of RVLW were similar in two groups(P0.05); Sm,Em,Am,Em/Am of the basal segments of the left ventricle were also similar in two groups (P0. 05).②Electromechanical delay(EMD)and isovolumic relaxation time(IVRT)of the basal segments of RVLW in CRBBB were longer than those in controls(55±13 ms vs 46±10 ms; 41±20 ms vs 30±16 ms,P0.05), Ejection time(ET)of the basal segments of RVLW in CRBBB patients were shorter than those in controls(309±43 ms vs 400±60 ms,P0.05),while isovolumic contraction time(IVCT) and filling time(FT) were similar in two groups(P0.05).EMD, IVCT,ET,IVRT,and FT of the basal segments of the left ventricle were not significantly different in two groups(P0.05). ③Myocardial performance index(Tei)in CRBBB patients was longer than that in controls(0.56±0.14 vs 0.43±0.13,P0.05).There was no much change for Tei of the basal segments of the left ventricle in two groups(P0.05). Conclusion CRBBB may have bad effects on mechanical function of right ventricle, but fail to impair systolic and diastolic functions of left ventricle.
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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