FMD is a noninvasive test that USES a blood pressure cuff and ultrasound to see how blood flows in the brachialartery when the arm is gently squeezed.
FMD是一种使用血压袖带及超声的一种非创伤性检查来测定当手臂受压时分支动脉的血流情况。
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So if you are measuring brachial blood pressure which is a much smaller tube than the central large artery and the more pliable the vessel is the less likely there is to be a difference.
On the one hand, the measuring object of so-called arterial pressure that we usually refer to aortic blood pressure, in the clinical practical, actually, is brachialartery.