Chimowitz M I, Nemec J J, Marwick T H, Lorig R J, Furlan A J, Salcedo E E
Department of Neurology, Cleveland Clinic Foundation, OH 44195.
Neurology. 1991 Dec;41(12):1902-4. doi: 10.1212/wnl.41.12.1902.
We performed transcranial Doppler ultrasound (TCD) and transesophageal contrast echocardiography simultaneously in four patients. In one patient with a patent foramen ovale and another patient with pulmonary A-V fistulae, we detected micro air bubbles in the right middle cerebral artery three to five cardiac cycles after their appearance in the left atrium following intravenous injection of contrast. In two patients without right-to-left shunts, we did not detect air bubbles in the left atrium or middle cerebral artery following injection of contrast. These results show that TCD can identify patients with right-to-left cardiac or pulmonary shunts.
我们同时对4例患者进行了经颅多普勒超声（TCD）和经食管对比超声心动图检查。在1例卵圆孔未闭患者和另1例肺动静脉瘘患者中，静脉注射造影剂后，我们在左心房出现微气泡3至5个心动周期后，于右侧大脑中动脉检测到了微气泡。在另外2例无右向左分流的患者中，注射造影剂后，我们未在左心房或大脑中动脉检测到气泡。这些结果表明，TCD可识别存在右向左心脏或肺分流的患者。
