Abstract
Bleeding associated with the presence of internal haemorrhoids may come from two sources: 1) small vessels in the overlying rectal mucosa, and 2) the venous radicles of the haemorrhoidal plexus. Although evidence from directly observed bleeding is surprisingly sparse, it is reasonable to surmise that slight bleeding (seen mainly on the toilet paper or faecal surfaces) is derived from torn mucosal vessels. This is supported by the usual cause, which is surface trauma from passage of a hard stool. If the bleeding is more than slight, and especially if it is profuse, as exemplified by blood dripping into the pan after defaecation, it is assumed to arise from torn haemorrhoidal veins. The colour of the blood does not distinguish between the two sources as it is bright red in both cases (the blood in the haemorrhoidal veins having a high oxygen content, see Ch. 2, p. 7).
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© 2002 Springer-Verlag London
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Mann, C.V. (2002). Sclerotherapy. In: Mann, C.V. (eds) Surgical Treatment of Haemorrhoids. Springer, London. https://doi.org/10.1007/978-1-4471-3727-6_8
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DOI: https://doi.org/10.1007/978-1-4471-3727-6_8
Publisher Name: Springer, London
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