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. 1981 Jan;22(1):45–48. doi: 10.1136/gut.22.1.45

Hypertrophy of the external and sphincter in haemorrhoids: a histometric study.

T Teramoto, A G Parks, M Swash
PMCID: PMC1419305  PMID: 7461476

Abstract

Biopsies of the external and sphincter taken from 24 male patients with haemorrhoids were subjected to examination using histochemical techniques. Fibre size (type 1 mean: 33 micrometers +/- 11.0 SD and type 2 mean: 47.9 micrometers +/- 15.0 SD) was increased when compared with control subjects. The distribution of muscle fibre types in these patients showed markedly greater type 1 fibre predominance (92%) than in control subjects. These abnormalities of the external sphincter did not show any clear relationship with age, degree of haemorrhoidal change, length of history of haemorrhoids, history of straining or of constipation, or perineal descent; however, increasing length of history up to 10 years was associated with increasing type 1 fibre predominance. We suggest that the external and sphincter in patients with haemorrhoids is in a state of increase tonic contraction, which causes work induced muscle hypertrophy and may contribute to increased resting pressure in the anal canal in patients with haemorrhoids.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Beersiek F., Parks A. G., Swash M. Pathogenesis of ano-rectal incontinence. A histometric study of the anal sphincter musculature. J Neurol Sci. 1979 Jun;42(1):111–127. doi: 10.1016/0022-510x(79)90156-4. [DOI] [PubMed] [Google Scholar]
  2. DUTHIE H. L., WATTS J. M. CONTRIBUTION OF THE EXTERNAL ANAL SPHINCTER TO THE PRESSURE ZONE IN THE ANAL CANAL. Gut. 1965 Feb;6:64–68. doi: 10.1136/gut.6.1.64. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Frenckner B., Euler C. V. Influence of pudendal block on the function of the anal sphincters. Gut. 1975 Jun;16(6):482–489. doi: 10.1136/gut.16.6.482. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Hancock B. D. Internal sphincter and the nature of haemorrhoids. Gut. 1977 Aug;18(8):651–655. doi: 10.1136/gut.18.8.651. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Hancock B. D., Smith K. The internal sphincter and Lord's procedure for haemorrhoids. Br J Surg. 1975 Oct;62(10):833–836. doi: 10.1002/bjs.1800621021. [DOI] [PubMed] [Google Scholar]
  6. Johnson M. A., Polgar J., Weightman D., Appleton D. Data on the distribution of fibre types in thirty-six human muscles. An autopsy study. J Neurol Sci. 1973 Jan;18(1):111–129. doi: 10.1016/0022-510x(73)90023-3. [DOI] [PubMed] [Google Scholar]
  7. PARKS A. G., PORTER N. H., MELZAK J. Experimental study of the reflex mechanism controlling the muscle of the pelvic floor. Dis Colon Rectum. 1962 Nov-Dec;5:407–414. doi: 10.1007/BF02616644. [DOI] [PubMed] [Google Scholar]
  8. PORTER N. H. A physiological study of the pelvic floor in rectal prolapse. Ann R Coll Surg Engl. 1962 Dec;31:379–404. [PMC free article] [PubMed] [Google Scholar]
  9. Parks A. G., Swash M., Urich H. Sphincter denervation in anorectal incontinence and rectal prolapse. Gut. 1977 Aug;18(8):656–665. doi: 10.1136/gut.18.8.656. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Schwartz M. S., Sargeant M., Swash M. Longitudinal fibre splitting in neurogenic muscular disorders--its relation to the pathogenesis of "myopathic" change. Brain. 1976 Dec;99(4):617–636. doi: 10.1093/brain/99.4.617. [DOI] [PubMed] [Google Scholar]

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