Venous occlusion

Japanese: 静脈閉塞 - じょうみゃくへいそく（英語表記）venous occlusion

Since ancient times, three reasons have been given for the blockage of veins: blood becomes more likely to clot, blood flow in the veins slows, and changes occur in the vein walls. There are two types of veins: cutaneous veins, which are located in shallow areas such as subcutaneous tissue, and deep veins, which are located deep between muscles, and even if a vein becomes blocked in the same way, the symptoms are completely different for each type. For example, in the lower limbs, the deep veins are responsible for 80% of the venous blood transport and the cutaneous veins for 20%, so when a deep vein is blocked, significant congestion occurs in the peripheral area, accompanied by swelling in the lower limbs and the skin turning reddish purple, but with cutaneous veins, no congestion symptoms are seen and the blocked area hardens, becomes red, swollen, and painful.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

静脈のつまることで，その原因として古くから，血液が固まりやすくなる，静脈の血流がゆっくりになる，静脈壁に変化が起こる，の三つがあげられている。静脈には，皮下組織などの浅いところにある皮静脈と，筋肉の間などの深いところにある深部静脈の二つがあって，同じように静脈がつまった場合でも，両者ではまったく症状が異なる。たとえば，下肢では静脈血輸送の分担は深部静脈が80％，皮静脈が20％となっているので，深部静脈がつまるとその末梢部には著しい鬱血（うつけつ）が起こり，下肢にむくみを伴い，皮膚の色も赤紫色になるが，皮静脈の場合には鬱血症状はみられず，つまった部分が硬くなり，赤くはれて痛い。

出典　株式会社平凡社世界大百科事典第２版について　情報

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