目的：明确长节段椎弓根螺钉重建后发生近端急性骨折的危险性及疗效。

Objective. To determine risk factors and outcomes for acute fractures at the proximal aspect of long pedicle screw constructs.

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目的探讨左室节段心肌在等容收缩期(ivc)与等容舒张期(ivr)长轴方向的运动特征及急性缺血时的变化规律。

Objective To investigate the features of left ventricular regional myocardial motion during isovolumic contraction (IVC) and isovolumic relaxation (IVR), and their changes in acute ischemia.

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