text_1: 如果 我们 认为 C - PTP 低且 d - 二聚体 水平 低于 1 , 000 ng / mL 或者 C - PTP 中等 且 d - 二聚体 水平 低于 500 ng / mL 的 门诊患者 可 排除 肺栓塞 , 并 根据 这些 结果 不 对 其 采取 胸部 影像学 检查 和抗凝 治疗 , 则 1 , 325 例 患者 在 随访 期间 均 未 发生 血栓 栓塞 并发症 .
  
text_2: when we considered pulmonary embolism to be ruled out if outpatients were assessed as having a low C @-@ PTP and had a d @-@ dimer level of less than 1000 ng per milliliter or were assessed as having a moderate C @-@ PTP and had a d @-@ dimer level of less than 500 ng per milliliter and therefore withheld chest imaging and anticoagulant therapy on the basis of these findings , none of the 1325 patients had thromboembolic complications during follow @-@ up .
  