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Biomedical subjects

D M Preston

Publications and source records attributed to D M Preston.

14 recordsLinked to original sources

Severe chronic constipation of young women: 'idiopathic slow transit constipation'.

A series of 64 women complaining of severe constipation is described, in each of whom delayed elimination of markers from the colon was demonstrated but a barium enema was normal. All completed a detailed questionnaire and the responses are compared with those obtained in an age-matched series of healthy women with no bowel complaint. In each group 40 women also recorded in a manner suitable for analysis all food eaten over a period of seven days. The patients passed about one stool weekly with the aid of laxatives, and were greatly troubled by abdominal pain, bloating, malaise and nausea, to the extent that the symptoms were a major social disability and many lost time from work. Decreased bowel frequency and other symptoms were often first noticed around the age of puberty and slowly became worse until they were severe by the third decade. In a few, the symptoms began suddenly after an abdominal operation c-accident. Comparison with the control group showed no evidence that the patients had been underweight at any time or that they took less fibre; treatment with a bran supplement did not usually help them. The patients experienced rectal sensation before defaecation less often than the control subjects and they used digital pressure to assist defaecation more frequently. The women with constipation tended to have more painful and irregular menstrual periods, and there was an increased incidence of ovarian cystectomy and hysterectomy. Hesitancy in starting to pass urine was more common, as were some somatic symptoms such as cold hands or blackouts. Attention is drawn to this distinctive combination in young women of slow total gut transit time and a colon of normal width on barium enema, associated with abdominal, anorectal, gynaecological and somatic symptoms, as a disorder which can be disabling and particularly difficult to treat.

Adolescent

Experience of posterior division of the puborectalis muscle in the management of chronic constipation.

Nine women with severe chronic constipation who were unable to expel a water-filled rectal balloon underwent posterior division of the puborectalis muscle. Pre-operative concentric needle electromyography and measurement of the anorectal angle at rest and during straining suggested that the puborectalis muscle failed to relax during attempted defaecation in these patients. Two patients reported improvement after surgery and had normal balloon expulsion after operation. However seven patients reported no benefit from surgery and tests of defaecatory function and anorectal angle did not change. Incontinence for solid stool was not reported following puborectalis muscle division although five patients reported incontinence of flatus, liquid stool and mucus.

Adult

Anismus in chronic constipation.

Among patients complaining of constipation, a group can be defined in which there is slow whole gut transit shown by retention of radiopaque markers but a rectum and colon of normal width judged by measurements of barium enema radiographs compared with control observations. It is not known whether their symptoms are due to an abnormality of colonic motility or to a failure of the defecatory mechanism. Defecation was simulated experimentally in a group of these patients by asking them to expel a water-filled rectal balloon. The constipated patients were not able to expel the balloon, whereas normal subjects could do so. Electromyography of the striated pelvic floor muscles during attempts at expulsion of the balloon in the constipated patients showed failure of the normal inhibition of resting activity. Failure of external and sphincter relaxation on attempted defecation may contribute to the symptoms of some patients who complain of constipation.

Adolescent

Pelvic motility and response to intraluminal bisacodyl in slow-transit constipation.

The resting motility of the pelvic colon was studied in 28 patients with constipation and compared with control subjects and patients with diarrhea. Colonic activity in patients who had been shown to have slow colonic transit was not significantly different from controls. In contrast, activity in patients who complained of constipation but who were found to have normal colonic transit time was increased (P less than 0.02). The response of the pelvic colon to the introduction of a surface-acting laxative was studied in 18 patients with slow-transit constipation. Eleven patients developed progressive peristaltic waves, while in 7 there was no response. It is possible that the relative inactivity of the colon in the latter group is due to a disorder of the myenteric plexus. If so, the bisacodyl stimulation test may distinguish patients with an abnormal myenteric plexus from those in whom it is normal.

Adult

Towards a radiologic definition of idiopathic megacolon.

Measurements of bowel width and rectal area were used to define normal limits of size in 50 double-contrast barium enema films. Two types of patient with constipation were defined by comparison with these results. In 18 women with prolonged whole-gut transit time, the measurements were within the normal range. Of 11 men and 9 women with a previous radiologic diagnosis of idiopathic megacolon, all had an enlarged rectum and the abnormal width extended proximally to involve the colon for a variable distance. A width of 6.5 cm at the pelvic brim provides a convenient and discriminating separation of normal from abnormal.

Chronic Disease

Positive correlation between symptoms and circulating motilin, pancreatic polypeptide and gastrin concentrations in functional bowel disorders.

Motilin, pancreatic polypeptide and gastrin blood concentrations in response to drinking water have been studied in 40 patients with functional bowel disease and compared with results in two groups of healthy control subjects. Patients with slow transit constipation and idiopathic megacolon showed impaired motilin release. Pancreatic polypeptide release was reduced in patients with slow transit constipation, but increased in those with functional diarrhoea. Gastrin release was impaired in all groups complaining of chronic constipation. Circulating motilin, pancreatic polypeptide and gastrin concentrations appear to bear some relationship to intestinal transit time in patients with functional bowel disorders.

Adult

Effect of different drinks on fluid and electrolyte losses from a jejunostomy.

The effectiveness of 5 different solutions on the absorption of fluid and electrolytes was tested in 7 patients with a proximal intestinal stoma and large fluid losses, all of whom previously needed intravenous infusions to maintain balance. In 4 patients it proved possible to replace the intravenous infusions with an enteral supplement. The WHO glucose/electrolyte solution without added potassium (NaCl 3.5 g, NaHCO3 2.5 g, glucose 20 g/l) gave satisfactory results, though was slightly less effective than a solution containing more sodium in which maltose was substituted for glucose. Neither sucrose nor an oligosaccharide (Caloreen) gave an advantage over glucose in the formulations used. In 3 patients losses were so great, and absorption of sodium from oral solutions so small, that intravenous supplements had to be continued. These 3 patients could be distinguished from the other 4 by the fact that more than 250 ml emerged from the stoma during the 3 hours after a drink of 500 ml of glucose/electrolyte solution. In all patients a drink of water or tea led to a loss of sodium from the stoma; water should be restricted in such patients and replaced by a glucose/electrolyte solution.

Administration, Oral

The balloon proctogram.

A balloon filled with barium has been used to simulate a soft stool for the radiological study of disorders of defaecation. Lateral radiographs demonstrate the level of the pelvic floor in relation to the pubococcygeal line, the change in the anorectal angle and the behaviour of the anal sphincters. In 12 patients with faecal incontinence, successfully treated surgically by postanal sphincter repair, the anorectal angle was reduced from 135 degrees +/- 4.4 degrees (s.e.m.) to 103 degrees +/- 4.1 degrees and the anorectal junction rose by 1.5 +/- 0.4 cm. In 10 patients with slow-transit constipation there was no pelvic descent and no change in the anorectal angle on straining. These patients were unable to expel the balloon and the results suggest that the pelvic floor does not relax normally.

Constipation

Results of colectomy for severe idiopathic constipation in women (Arbuthnot Lane's disease).

Twenty-one women with slow-transit constipation have been treated by bowel resection. All had a normal barium enema, but an increased colonic transit time. Pathological examination of the resected colons showed no evidence of aganglionosis. Some of the patients were treated by segmental colonic resection, anorectal myectomy, anal stretch or internal sphincterectomy but were not helped. Colectomy with ileorectal or caecorectal anastomosis gave the best results; on balance, ileorectal anastomosis seems preferable. Of sixteen patients who underwent colectomy, ten subsequently had normal bowel function and four were markedly improved. The spontaneous bowel frequency in this group rose from 0.3 +/- 0.1 (s.e.m.) to 21.7 +/- 8.3 weekly (P less than 0.001).

Adolescent

Carcinoma of the anus in Crohn's disease.

The incidence of gastrointestinal cancer in patients with Crohn's disease may be slightly increased. We report 2 cases of squamous cell carcinoma of the anus occurring in patients with distal Crohn's disease.

Aged

The "air enema" in acute colitis.

The plain abdominal radiograph is an important investigation in acute colitis, but may fail to demonstrate the state of the colon owing to a lack of intracolonic gas. The extent of the colitis can be demonstrated by introducing air directly into the large bowel; the air also provides sufficient contrast to distinguish a granular from an ulcerated mucosa. The "air enema" may be used as an alternative to an unprepared barium enema. Its accuracy has been established by comparison with an unprepared barium enema in 10 patients with acute colitis.

Acute Disease