Assessment of dietary intake and trace element status in patients with ileal pouch-anal anastomosis.

ABSTRACT

PURPOSE: Panproctocolectomy and ileal pouch-anal anastomosis is the operation of choice for patients with ulcerative colitis and familial polyposis. The long-term nutritional consequences after pouch surgery are unknown. We have assessed the nutritional status of the essential trace elements-zinc, copper, manganese, and selenium-in patients several years (median, 10 (range, 2-15) years) after surgery. METHODS: Fifty-five patients with uncomplicated ileal pouch-anal anastomosis and 46 healthy control subjects were studied. A dietary assessment of trace element intake was undertaken by using a semiquantitative food frequency questionnaire. The patients' trace elements status for zinc, copper, manganese, and selenium was assessed by measuring their concentrations in blood. RESULTS: The dietary intake of individual trace elements was similar in both groups (all P values > 0.4). There was no significant difference in the concentrations of plasma copper, zinc, and selenium between patients and healthy control subjects (all P values > 0.07). The concentration of whole blood manganese was significantly higher (P = 0.004) in patients (median, 178.5 nmol/l; range, 59-478 nmol/l) compared with healthy control subjects (median, 140 nmol/l; range, 53-267 nmol/l). Four (7 percent) patients had manganese concentrations more than three standard deviations of the mean of control group (>255 nmol/l). CONCLUSIONS: This study shows that patients who have had uncomplicated pouch surgery have a normal dietary intake of trace elements and do not develop deficiencies in copper, zinc, manganese, and selenium. However, these patients may be at increased risk of manganese toxicity.