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Biomedical subjects

I M Chesner

Publications and source records attributed to I M Chesner.

At least 19 recordsLinked to original sources
PubMed2006

UK acquired hepatitis E--An emerging problem?

Eight cases of hepatitis E acquired in the UK are reported. These cases presented to an inner city hospital in Birmingham, UK, over a 5-month period in 2005. HEV is considered unusual in the UK and generally occurs after travel to endemic regions. Only five cases of hepatitis E acquired in the UK have been reported in the literature. This series represents an increase in the local incidence of hepatitis E, particularly that of UK-acquired infection. HEV should be considered in all patients with acute hepatitis, irrespective of travel history.

Adult↗
PubMed1994

Percutaneous endoscopic gastrostomy in a general hospital: prospective evaluation of indications, outcome, and randomised comparison of two tube designs.

The indications for percutaneous endoscopic gastrostomy (PEG) and patient outcome, were examined prospectively in the setting of a general hospital. In the course of 26 months, 76 patients underwent PEG (median age 62 years (range 18-99)) and were followed up for 6887 patient days. The median (range) duration of PEG feeding was 93 (3-785) days. The procedure was carried out for neurological indications in 76% of cases (stroke 51%) and 53% of patients were severely malnourished (body mass index < 17 kg/m2) at the time of referral. In 12 (16%) patients swallowing recovered and the PEG was removed after a median (range) of 55 days (20-150). Three (4%) deaths were related to PEG (one oesophageal perforation, one haemorrhage, and one aspiration pneumonia). One patient developed peritonism and ileus, which resolved with conservative treatment. Minor complications included local sepsis 3%, tube blockage 12%, and tube connector leak 5%. During seven days of observation, demands on nursing time for routine care of the PEG were the same as for nasogastric tube feeding, median (range) 21 (4-42) v 16 (4-40) min/day respectively, but in about half the latter cases the tube had to be replaced at least once. Over 15 months, 29 patients were randomised to receive a 1.9 mm inner, 2.9 mm (9F) outer diameter Fresenius and 27 a 3.0 mm inner, 4.0 mm (12F) outer diameter Bower polyurethane tube and were followed for 2920 and 2388 patient days respectively. There was no difference in the insertion time (median (range) 20 (10-45) v 24 (10-45) min respectively) or number of patients with complications (three v eight patients NS), although there were more minor mechanical problems (three v 12, p < 0.01) with the 12F tube. The internal anchoring device of the 12F tube allowed its non-endoscopic removal, a method applicable too 16% of cases. No tubes were removed because of blockage.

Adolescent↗
PubMed1990

Portal hypertension secondary to sigmoid colon arteriovenous malformation.

A case of portal hypertension secondary to an arteriovenous malformation of the sigmoid colon is presented. The importance of mesenteric angiography in the diagnosis of this condition is discussed. The dramatic clinical improvement in this case following surgery emphasizes that arteriovenous malformations of the gastrointestinal tract represent a potentially curable cause of portal hypertension.

Adult↗
PubMed1990

Small intestinal bacterial overgrowth in patients with chronic lymphocytic leukaemia.

As part of a study to assess the possible contribution of lymphoid infiltration of the gastrointestinal mucosa to occult blood loss or malabsorption 20 patients with chronic lymphocytic leukaemia (CLL) had a lactulose hydrogen breath test. In 10 cases (50%) a small intestinal peak was detected, suggesting small bowel bacterial overgrowth, and this was confirmed in seven patients by the positive culture of jejunal aspirate. Of the patients with a positive hydrogen breath test, radiological examination showed a duodenal diverticulum in two but no anatomical abnormalities in the other cases. There was no evidence of achlorhydria and transit times were normal. There was no difference in the incidence of hypogammaglobulinaemia among those patients with evidence of small intestinal bacterial overgrowth and those without. Seven patients with a positive hydrogen breath test, however, had undetectable secretory piece in their jejunal aspirates whereas this was present in all patients with a normal breath test who had local immunoglobulin concentrations measured (p less than 0.05), indicating that the small intestinal bacterial overgrowth may be due to impaired local immunity.

Agammaglobulinemia↗
PubMed1989

Significance of venous and lymphatic invasion in malignant polyps of the colon and rectum.

Three hundred and sixty seven neoplastic colorectal polyps removed at endoscopy of which 34 were complicated by invasive carcinoma, were reviewed clinically and histologically to assess the prevalence and clinical significance of venous and or lymphatic invasion. Traditional stains for histological assessment were supplemented by immunohistochemical methods. Venous and or lymphatic invasion was present in six cases (17.6%), with a statistically significant association with recurrent carcinoma or Dukes's C carcinoma in polyps otherwise regarded as completely excised. The presence or absence of venous and or lymphatic invasion in malignant polyps should be documented as if present, further treatment is indicated. A combination of haematoxylin and eosin and elastic-van Gieson stains will usually identify the presence of vascular invasion. Where a discrepancy arises, however, additional immunohistochemical stains may be of value.

Colon↗
PubMed1988

The effect of altitude on tests of reaction time and alertness.

Psychomotor performance was assessed in 20 subjects on each of 2 mountaineering expeditions. During the first, which reached 5,008 m, simple reaction time and alertness were measured, on the second to 4,790 m these were replaced by a three-choice reaction time test. In both, mean reaction times increased significantly at altitude in subjects with marked symptoms of Acute Mountain Sickness (AMS), whereas the alertness tests showed no effects. Reaction times were not affected by other environmental factors but adverse conditions increased the number of errors. The increase in reaction time may be ascribed either to the lethargy associated with AMS or alternatively may have been a direct effect of hypoxia. The latter explanation is favoured because of reports by other workers of an increase in reaction time with altitude in the absence of AMS.

Acetazolamide↗
PubMed1987

Intestinal absorption at high altitude.

Three tests of small intestinal function were performed at 3100 m and 4846 m to seek evidence of malabsorption of high altitude. Xylose tolerance did not change in 11 subjects but, in three who ascended to 5600 m, one-hour xylose levels were significantly lower. The results of an oxalate loading test did not suggest significant fat malabsorption. A direct fat absorption test using chylomicron levels after ingestion of 100 g fat showed significantly increased levels at high altitude. We conclude that there is no evidence of malabsorption up to 4846 m.

Acetazolamide↗
PubMed1987

The origin of proteinuria at high altitude.

Urinary protein excretion was measured before and after the intravenous infusion of lysine in 14 normal subjects after 4-6 days' acclimatization at 4846 m. Urinary albumin excretion before lysine was elevated in 11 subjects but alpha 1-microglobulin was detected in only four. After lysine a large increase in albumin excretion occurred in all subjects. Together with the absence of alpha 1-microglobulin before lysine this implies that increased glomerular capillary permeability is the major cause of proteinuria after acclimatization to high altitude. The estimated minimum glomerular fluid albumin concentration was increased two to three fold above the published values in normal controls.

Acclimatization↗
PubMed1987

Effect of acetazolamide on blood gases and 2,3 DPG during ascent and acclimatization to high altitude.

Blood gases and red cell 2,3 DPG concentrations were measured during ascent and a stay for 6 days at 4846 m in 20 subjects. Acetazolamide improved Pa,O2 and reduced pH and Pa,CO2. 2,3 DPG concentrations were lower in the acetazolamide group during ascent and at high altitude. However, 2,3 DPG concentrations were significantly greater at high altitude in both the acetazolamide and placebo groups compared with low altitude. The acetazolamide group remained different from the placebo group during the stay at high altitude with higher Pa,O2, lower PaCO2, lower pH and lower 2,3 DPG concentrations.

2,3-Diphosphoglycerate↗
PubMed1987

Ulcerative colitis complicated by disseminated intravascular coagulation.

We report a case of chronic ulcerative colitis complicated by clinical evidence of disseminated intravascular coagulation and pathological evidence of intestinal ischaemia secondary to venular and capillary fibrin thrombi. This may well represent an example of univisceral Shwartzman reaction occurring in a sensitized target organ.

Colitis, Ulcerative↗
PubMed1987

Time relationships between cessation of smoking and onset of ulcerative colitis.

From 5 centres 154 patients with ulcerative colitis and a history of smoking completed a questionnaire about the temporal relationship between diagnosis of colitis and cessation of smoking. One hundred and thirty-eight of these were ex-smokers and 107 (69.5%) had stopped smoking before the diagnosis of colitis was made. Fifty-six patients (52%) developed colitis within 3 years of stopping smoking. The findings suggest that smoking exerts protective effect against the development of ulcerative colitis.

Adolescent↗