Digestive diseases and sciences
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Randomized Controlled Trial Comparative Study Clinical Trial
Response to intraluminal gas in irritable bowel syndrome. Motility versus perception.
Our aim was to evaluate the response to intraluminal gas in irritable bowel syndrome and to determine whether this response was consequent upon disordered motility or altered perception. We evaluated 10 patients who satisfied the clinical criteria for the diagnosis of irritable bowel syndrome and 10 healthy controls. An eight-lumen perfused catheter assembly was positioned to monitor motor activity in the duodenum and proximal jejunum; a separate side port in the distal duodenum permitted gas infusion. ⋯ Patients with irritable bowel syndrome described more pain (score, mean +/- SE, control versus irritable bowel: 0.22 +/- 0.16 vs 1.65 +/- 0.5, P < 0.01) and nausea (0.25 +/- 0.21 vs 1.45 +/- 0.64, P < 0.04) during sham gas; motility indices were similar in both groups. During active gas, irritable bowel syndrome patients reported more pain (0.40 +/- 0.39 vs 2.94 +/- 1.16, P < 0.03); motility indices at all sites were similar in both groups. Symptom severity in irritable bowel syndrome subjects randomized to receive atropine was similar to control subjects during active gas infusion; motility indices were similar.(ABSTRACT TRUNCATED AT 250 WORDS)
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The etiology of upper digestive complaints in uremic patients, which frequently cause morbidity, is unclear. By means of ultrasonography we studied the emptying of the gastric antrum in 15 patients suffering from end-stage renal disease and in 15 controls. In addition, we tested for autonomic neuropathy in the chronic renal failure (CRF) patients using cardiovascular tests. ⋯ The CRF subgroup with exclusively parasympathetic neuropathy (5/15) had antral emptying similar to the controls. The symptom score as assessed by a standardized questionnaire of the CRF group with autonomic neuropathy (11/15) correlated significantly both with the fasting antral cross-sectional area and inversely with antral expansion immediately after finishing the test meal. Antral emptying showed a trend towards an inverse relationship to the symptom score, which reached statistical significance only in the CRF subgroup with sympathetic plus parasympathetic autonomic damage.(ABSTRACT TRUNCATED AT 250 WORDS)
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Case Reports Comparative Study
Colonic lactate metabolism and D-lactic acidosis.
D-Lactic acidosis is seen in patients with intestinal bypass or short bowels in whom colonic produced D-lactate accumulates. An intestinal bypassed patient with D-lactic acidosis had higher fecal D-lactate (122.4 mmol/liter) and L-lactate (90.1 mmol/liter) than described before in humans. D-Lactate fluctuated between 0.5 and 3.1 mmol/liter in plasma (normal < 0.1 mmol/liter) and between 1.1 and 52.8 mmol/liter in urine (normal < 0.7 mmol/liter) within a few hours, indicating that the human organism do metabolize and excrete D-lactate. ⋯ L-Lactate was converted to D-lactate and vice versa, and both were degraded to the short-chain fatty acids acetate, propionate, and butyrate. An infrequent, but elevated ability of the colonic flora to produce lactate may be a prerequisite for D-lactic acidosis to occur and may explain why the syndrome is so seldom seen even in patients with intestinal bypass or short bowels. The suggestion that D-lactate is not metabolized and hence accumulates is probably not valid.
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The effects of nonsteroidal antiinflammatory drugs on ulcerogenesis and gastric secretion were evaluated in a pylorus-ligated rat model. Oral administration of salicylate (50 mg/kg), aspirin (50 mg/kg), and indomethacin (3.5 mg/kg) significantly increased ulcerogenesis over the basal value by six- to sevenfold, but ibuprofen's (10 mg/kg) fourfold increase was not significant. Aspirin in conjunction with histamine (0.5 mg/kg subcutaneously) significantly increased ulcerogenesis by 2.7-fold compared to histamine alone. ⋯ Ranitidine pretreatment (25 mg/kg intraperitoneally) significantly decreased basal acid and pepsinogen secretion in all treatment groups by > 85% and > 40%, respectively, and ulcerations induced by salicylate, aspirin, and indomethacin were also inhibited by 90%, 60%, and 60%, respectively. The observed inhibition of prostaglandin E2 generation by nonsteroidal antiinflammatory drugs under basal secretory conditions appeared to correlate with the extent of ulcerogenesis. Our data support the concept that acid, in addition to inhibition of prostaglandin E2 synthesis, plays an important role in the pathogenesis of nonsteroidal antiinflammatory drug-induced gastropathy.
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Review Case Reports
Complications of biliary stents in obstructive pancreatic malignancies. A case report and review.
Biliary stents have become a common palliative measure in the treatment of unresectable obstructive pancreatic cancer. Survival after endoscopic stenting rivals that of surgical bypass. ⋯ A case report and review of stent-related morbidity is presented. Overall complication rates range from 15 to 34%, often requiring stent replacement and occasionally requiring surgical intervention.