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目的：探索二氧化碳气体作为血管造影剂的临床应用效果。材料方法：对１６例患者行二氧化碳数字减影血管造影（ＣＯ２－ＤＳＡ）。其中肝动脉造影８例，腹主动脉造影１例，股动脉造影２例，直接门静脉造影３例，肾静脉造影２例，并与同一患者碘剂造影比较。结果：在８例肝肿瘤中，ＣＯ２－ＤＳＡ显示肝动脉－门静脉瘘（ＡＰＦ）６例（６／８），而碘剂显示１例（１／８）。ＣＯ２－ＤＳＡ显示肝内小动脉分支及肿瘤染色不如碘造影剂。但腹主动脉造影、股动脉造影和直接门静脉造影图像较满意，且副作用小。结论：ＣＯ２是一种安全的血管造影剂。ＣＯ２－ＤＳＡ可得到准确、有价值的血管图像，且危险性小。它是显示肝ＡＰＦ的可靠方法
Objective: To explore the clinical application of carbon dioxide gas as angiography contrast agent. Materials Methods: Carbon dioxide digital subtraction angiography (CO2-DSA) was performed on 16 patients. Including hepatic artery angiography in 8 cases, abdominal aortography in 1 case, femoral artery angiography in 2 cases, direct portal vein angiography in 3 cases, renal vein angiography in 2 cases, and with the same patient iodine contrast. Results: In 8 cases of hepatic tumors, CO2-DSA showed hepatic arterial-portal venous fistula (APF) in 6 cases (6/8) and iodine in 1 case (1/8). CO2-DSA showed inferior intrahepatic arteriolar branches and tumor staining than iodine contrast agent. However, abdominal aortography, femoral artery angiography and direct portal venography angiography more satisfactory, and the side effects of small. Conclusion: CO2 is a safe angiogenic agent. CO2-DSA can get accurate and valuable vascular images, and the risk is small. It is a reliable method of displaying liver APF