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首页> 外文期刊>Journal of Clinical Ultrasound: JCU >Effect of preload reduction on sonographic myocardial integrated backscatter.
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Effect of preload reduction on sonographic myocardial integrated backscatter.

机译：减少预负荷对超声心肌综合背向散射的影响。

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摘要

PURPOSE: Sonographic myocardial tissue characterization with integrated backscatter (IBS) is affected by both structural and functional properties of the myocardium. The aim of the present study was to investigate the effect of preload reduction by hemodialysis (HD) on IBS measurements. METHODS: Fifty-two patients on maintenance HD underwent echocardiography before and after a routine HD session. Measurements included the variation of IBS during the cardiac cycle (CV-IBS) and calibrated IBS (cal-IBS). RESULTS: After HD, there were significant reductions in left ventricular end-diastolic and end-systolic dimensions and left atrial diameter. There was a reduction in stroke volume and LV ejection fraction consistent with a reduction in preload. Furthermore, CV-IBS was significantly lower after HD (7.9 +/- 2.2 versus 6.9 +/- 1.8 dB, 7.0 +/- 2.1 versus 6.2 +/- 1.9 dB, and 9.0 +/- 2.6 versus 8.1 +/- 2.0 dB [p < 0.01], respectively, in the left anterior, lateral, and inferior wall of the ventricle). Cal-IBS remained unchanged after dialysis compared with baseline. CV-IBS and ultrafiltration volume were significantly correlated. CONCLUSION: HD leads to a decrease in CV-IBS that appears to be preload-dependent. This finding is in concordance with diminished left ventricular performance during HD.
机译：用途：集成背向散射（IBS）的超声心肌组织特征受心肌结构和功能特性的影响。本研究的目的是研究通过血液透析（HD）减少预负荷对IBS测量的影响。方法：52例维持高清的患者在常规高清会议之前和之后接受了超声心动图检查。测量包括心动周期期间IBS的变化（CV-IBS）和校准IBS（cal-IBS）。结果：HD后，左心室舒张末期和收缩末期的尺寸以及左心房直径明显减少。搏动量和左室射血分数的降低与预负荷的降低相一致。此外，HD后CV-IBS显着降低（7.9 +/- 2.2 vs 6.9 +/- 1.8 dB，7.0 +/- 2.1 vs 6.2 +/- 1.9 dB，9.0 +/- 2.6 vs 8.1 +/- 2.0 dB [p <0.01]，分别在心室的左前壁，侧壁和下壁）。与基线相比，透析后Cal-IBS保持不变。 CV-IBS与超滤量显着相关。结论：HD导致CV-IBS下降，这似乎与预负荷有关。这一发现与HD期间左心室功能的降低相一致。

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