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The mask (a) with related tube was connected to the watch-shaped manometer (b), which was detached from an aneroid sphygmomanometer (XB-11 aneroid sphygmomanometer, Shanghai Medical Equipment Factory, Shanghai, China), and the needle of the manometer was set at 100 mmHg as the zero point. The pulse transducer (c) with wire and plug could be attached to the ultrasonographic system to display the action of the Valsalva maneuver.
