Murzi B, Reginato E, Carletti E, Cornali M
Cardiovasc Intervent Radiol. 1985;8(3):131-3. doi: 10.1007/BF02552877.
Blood that drains into the right atrium through an isolated left superior vena cava (LSVC) can be a complicating condition during cardiac surgery. In cases of LSVC, a double shadow can be present on standard chest X-ray over the left mediastinum. A notch along the lower contour of left atrium has been previously reported by Owen et al. in 4 cases as an indirect sign of this LSVC anomaly. These two indirect signs were evaluated in 135 (4.5%) cases of LSVC, viewing 89 chest radiographs and 40 angiograms. Their incidence, separately (17-45%) or in combination (9-20%), was observed to be frequent enough to justify a systematic search of these signs in open-heart surgery candidates.
通过孤立的左上腔静脉（LSVC）流入右心房的血液在心脏手术期间可能是一种复杂情况。在LSVC病例中，标准胸部X光片上左纵隔上方可能会出现双重阴影。Owen等人先前在4例病例中报告，左心房下缘的切迹是这种LSVC异常的间接征象。在135例（4.5%）LSVC病例中对这两种间接征象进行了评估，查看了89张胸部X光片和40张血管造影照片。观察到它们单独出现（17 - 45%）或联合出现（9 - 20%）的发生率足够高，足以证明在心脏直视手术候选者中系统地寻找这些征象是合理的。
