BACKGROUND To determine the effect of hydration as well as prone versus supine positioning on the pelvic veins during cardiovascular magnetic resonance (CMR) venography. METHODS Under institutional review board approval, 8 healthy subjects were imaged with balanced steady state free precession, non-contrast CMR venography to measure common and external iliac vein volumes and common femoral vein cross-sectional area in the supine, prone and decubitus positions after dehydration and again following re-hydration. CMR venography from 23 patients imaged both supine and prone were retrospectively reviewed and measurements of common femoral and iliac veins areas were compared using Wilcoxon test. RESULTS Common femoral vein area on CMR venography increased with prone positioning (83 ± 35 mm2) compared to supine positioning (59 ± 21 mm2) (p = 0.02) and further increased with hydration to 123 ± 44 mm2 (p < 0.01). With right and left side down decubitus positioning, the common femoral vein area on dehydration increased from 29 ± 17 mm2 in the ante-dependent position to 134 ± 36 mm2 in the dependent position (p < 0. 001). Similarly, common and external iliac veins increased in volume with prone, 5.4 ± 1.9 cm3 and 5.8 ± 1.9 cm3 compared to supine positioning 4.6 ± 1.8 cm3 and 4.5 ± 1.9 cm3 (p = 0.01) and further increase with hydration to 6.7 ± 2.1 cm3 and 6.3 ± 1.9 cm3 (p = 0.01). CMR venography on patients also demonstrated an increase in mean common femoral vein luminal area from 103 ± 44 mm2 in supine position to 151 ± 52 mm2 with prone positioning (p < 0.001) as well as increases in common and external iliac vein volumes from 6.5 ± 2.6 cm3 and 8.0 ± 3.4 cm3 in the supine position to 7.5 ± 2.5 cm3 and 9.3 ± 3.6 cm3 with prone positioning (p < 0.01). CONCLUSIONS Common femoral and common/external iliac vein size on CMR venography may be affected by position and hydration status. Routine clinical CMR venography of the pelvis could include prone positioning and avoiding dehydration to maximize pelvic vein distension.

中文翻译：

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骨盆心血管磁共振静脉造影：静脉变化随患者位置和水合状态而变化。

背景技术为了确定水合以及俯卧位与仰卧位与仰卧位对盆腔静脉在心血管磁共振（CMR）静脉造影期间的影响。方法在机构审查委员会的批准下，对8名健康受试者进行平衡稳态无进动，无造影剂CMR静脉成像，以测量脱水后仰卧位，俯卧位和卧位的common总和external外静脉容积和股总静脉横截面积再次补水后。回顾性回顾了23例仰卧位和俯卧位患者的CMR静脉造影，并使用Wilcoxon检验比较了股总和静脉的面积。结果与仰卧位（59±21 mm2）相比，仰卧位（83±35 mm2）CMR静脉造影上股总静脉面积增加（p = 0。02）并随着水合进一步增加至123±44 mm2（p <0.01）。在右侧和左侧向下放置褥疮的情况下，脱水时的股总静脉面积从前侧依赖位置的29±17 mm2增加到侧向依赖位置的134±36 mm2（p <0. 001）。同样，与仰卧位4.6±1.8 cm3和4.5±1.9 cm3（p = 0.01）相比，俯卧时common总静脉和静脉的体积分别为5.4±1.9 cm3和5.8±1.9 cm3（p = 0.01），并且随着水合作用而进一步增加至6.7±2.1 cm3和6.3±1.9 cm3（p = 0.01）。对患者进行的CMR静脉造影还显示，平卧位股骨平均静脉腔面积从平躺位置的103±44 mm2增加到151±52 mm2（p <0.001），as总和and外静脉体积也从6.5±增加2.6 cm3和8.0±3。仰卧位4 cm3至7.5±2.5 cm3和9.3±3.6 cm3，俯卧位（p <0.01）。结论CMR静脉造影上常见的股骨和普通//外静脉大小可能受位置和水合状态的影响。骨盆的常规临床CMR静脉造影可包括俯卧位和避免脱水以使骨盆静脉扩张最大化。