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Zhang Xiaojing is a former soldier in the Longyou Army who served on the frontiers of the Tang dynasty.After retiring, he joined the local security of the city of Chang'an, the heart of the empire, but he was imprisoned and sentenced to death after an incident in which Zhang killed 34 members of a gang that murdered his former Army commander Wen, and then killed his current commanding officer.
A spontaneous breathing trial is a test for patients on mechanical ventilation, before they can be weaned from the ventilator, i.e. return to normal breathing.The weaning process depends closely on the patient's pathology, but the final common pathway to ventilator independence always includes at least one trial of spontaneous breathing.