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  • The Pressure in the Superior Hemorrhoidal Vein in the Etiology of the Hemorrhoid

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The elevation of the pressure in the superior hemorrhoidal vein is said to be an important factor in the etiology of the hemorrhoid. By masuring the pressure in the superior hemorrhoidal vein experimentally, some investigations were made to study various factors which elevate the pressure and some comments were made on the causative factors in the genesis of the hemorrhoid.<BR>The experiments were made on 16 healthy dogs. Under anesthesia in II dogs, while polyethylene tube threaded into the superior hemorrhoidal vein through its branch per abdomen or per anus and in other 5 dogs by leaving the tube in the vein for 1 to 3 days following the recovery from the anesthesia, the changes of the venous pressure was recorded by the electro-manometer simultaneously with femoral artery pressure.<BR>Under deep anesthesia the superior hemorrhoidal pressure ranged 15 to 21 mmHg on supine position and it was lower without anesthesia. Little effect was found in the administration of hyper- and hypotensive agent and slight elevation of the pressure was found with the distention and filling of the urinary bladdder and with the contraction of the anal sphincter muscles. The moderate elevation of the pressure was recorded in standing position, by compressing the proximal portion of the superior hemorrhoidal vein etc, and the marked elevation with the increase of the intrarectal pressure, compression applied over the abdominal wall, defecation and coughing, however never exceeding the range of 40 to 61 mmHg.<BR>These factors leading to the high elevation of the pressure may play causative roles in the genesis of the hemorrhoid and further comments were made on the augumentative factors of the pressure. Author's abstract

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