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Effect of Oral Hypoglycaemic Agents on Glucose Tolerance in Pancreatic Diabetes

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Effect of Oral Hypoglycaemic Agents on Glucose Tolerance in Pancreatic Diabetes Gut: first published as 10.1136/gut.13.4.285 on 1 April 1972. Downloaded from Gut, 1972, 13, 285-288 Effect of oral hypoglycaemic agents on glucose tolerance in pancreatic diabetes B. I. JOFFE, W. P. U. JACKSON, S. BANK, AND A. I. VINIK From the Department of Medicine, Witwatersrand University Medical School, Johannesburg, the Gastro- intestinal and Endocrine Research Units of Cape Town University Medical School, and the Chemical Pathology Department of Natal University, South Africa SUMMARY The short-term therapeutic effect of oral hypoglycaemic agents has been assessed in 12 patients with symptomatic diabetes secondary to chronic pancreatitis (pancreatic diabetes). In six patients who had moderate to severe carbohydrate intolerance, associated with severe insulino- paenia during arginine infusion, the potent sulphonylurea chlorpropamide produced no change in the fasting blood glucose level after two weeks of treatment. This contrasted with the significant reduction produced in a matched group of maturity-onset primary diabetics. The six patients with milder diabetes, and a greater (although still subnormal) insulin secretory capacity, showed an improvement in oral glucose tolerance during the first hour following glucose administration while on chlorpropamide. When the biguanide phenformin was substituted for chlorpropamide in five of these patients, a statistically insignificant improvement in glucose tolerance was observed during treatment. Applications of these findings to the practical management of pancreatic diabetes are briefly http://gut.bmj.com/ considered. Chronic pancreatitis is frequently complicated by and two women, ranging from 30 to 67 years of age. diabetes (pancreatic diabetes). Recent studies The diagnosis of pancreatitis was confirmed on the utilizing immunoassay procedures (Joffe, Bank, basis of a gross abnormality in at least two aspects of Jackson, Keller, O'Reilly, and Vinik, 1968; Anderson the pancreatic function test, namely, a low volume of on September 24, 2021 by guest. Protected copyright. Davison, Dick, Hales, and Owens, 1970) have pancreatic secretion (normal > 140 ml) measured indicated that when carbohydrate intolerance 80 minutes after secretin or pancreozymin stimu- supervenes, insulin reserve is often considerably lation; a mean bicarbonate level of 50 m-equiv/litre diminished. However, treatment of the diabetes with or less (normal > 65 m-equiv/litre); and a mean exogenous insulin may be complicated by severe amylase value of 40 Pimstone units/ml or less hypoglycaemic episodes (Bank, 1966). A study was (normal > 5.0 Pimstone units/ml). Furthermore, therefore designed to assess the short-term effect of radiological evidence of pancreatic calcification was oral hypoglycaemic agents in pancreatic diabetics observed in 11 of these patients, while steatorrhoea with reference to their insulin-secretory status. The (faecal fat excretion > 5 g per day) was present in results of blood glucose concentrations and glucose two-thirds of cases. Alcohol was thought to be of tolerance before and after treaLment are reported in aetiological importance in all instances; despite this, this paper. clinical, biochemical, and histological evidence of liver disease was absent in all except one case. Six of Patients and Methods the 12 patients had had clinical diabetes for longer than a year (maximum duration seven years) and in PATIENTS the remainder symptomatic diabetes was recently Twelve non-obese patients with proven chronic discovered. Only one had previously suffered from pancreatic disease were studied. There were 10 men ketosis. None gave a family history of diabetes, had previously received regular insulin therapy, or was taking drugs known to affect carbohydrate metab- Received for publication 25 January 1972. olism. 285 Gut: first published as 10.1136/gut.13.4.285 on 1 April 1972. Downloaded from 286 B. I. Joffe, W. P. U. Jackson, S. Bank, and A. L. Vinik EXPERIMENTAL DESIGN Results After stabilization on a 2000 calorie 'diabetic' diet, patients were arbitrarily divided on the basis of Table I indicates the insulin secretory capacity of the fasting blood sugar determinations into two groups: two pancreatic diabetic subgroups, together with those with elevated fasting levels, ie, above 120 mg/ that of normal controls, as evidenced by their fasting 100 ml, were labelled 'moderate to severe' diabetics and peak plasma immunoreactive insulin responses and those with normal fasting values designated as to intravenous arginine. Although fasting levels were 'mild' diabetics. Each group consisted of six patients. similar, a tendency for insulin reserve to diminish with deteriorating carbohydrate tolerance was Arginine and chlorpropamide studies apparent. Numbers were too small for statistical The insulinogenic effect of arginine, a potent evaluation of results. stimulus to beta cell activity (Floyd, Fajans, Conn, Knopf, and Rull, 1966), was estimated in the two Group No. of Plasma Insulin (uU/ml) groups in an attempt to establish their insulin Subjects after Arginine secretory capacity. For this purpose, 30g arginine infusion studies were performed after an overnight Fasting Peak fast in four of the severe pancreatic diabetics, all six Moderate to severe pancreatic 4 9 ± 1 12 ± 2 mild patients, and also in seven non-obese normal diabetics Mild pancreatic diabetics 6 9 ± 2 21 i 4 male controls. Plasma samples for immunoreactive Controls 7 10 2 41 7 insulin determinations were obtained fasting, at the completion of the 30-minute infusion period, and Table I Fasting andpeak plasma insulin responses 30 half hourly for a further hour. The fasting and peak (mean ± SEM) alter g arginine infusions in the severe and mildpancreatic diabetics as well as in seven insulin values recorded during the test in each patient controls were used for analysis. In the moderate to severe group, therapy was then instituted with 500 mg of chlorpropamide daily and The effect ofchlorpropamide (in a uniform dose of after two weeks a repeat fasting blood glucose level 500 mg daily) on fasting blood glucose levels in the http://gut.bmj.com/ obtained in each case. For comparison a group of six patients with moderate to severe pancreatic seven recently diagnosed maturity-onset primary diabetes is shown in Table II. The drug produced no diabetics of matched age and severity were similarly appreciable change in the mean fasting value, investigated. The six mild pancreatic diabetics were compared with the significant fall observed in the subjected to formal 50 g oral glucose tolerance tests group of maturity-onset primary diabetics. and then treated with chlorpropamide in an average daily dose of 375 mg. After a two-week period Diabetic No. of Age Blood Significance on September 24, 2021 by guest. Protected copyright. repeat glucose tolerance tests were performed. In Group Subjects Glucose (mg/ five of these patients chlorpropamide was then 100 mt) withdrawn and a further glucose tolerance test Before After carried out a month later; it was felt that with a Treatment Treatment biological half-life of about 36 hours, 'carry-over' Pancreatic 6 46 237 i 25 241 i 25 NS chlorpropamide activity would be negligible at this Primary 7 51 187 ± 17 130 ± 15 <005 stage. Thereafter they were given phenformin (in a dose of 50 mg sustained release capsule twice a day) Table II Effect ofchlorpropamide on fasting blood for a glucose levels (mean ± SEM) in moderate to severe two-week period at the end of which a final pancreatic andprimary diabetics glucose tolerance test was done. All tolerance tests were performed at rest, after an overnight fast; patients who were tested while on Table III summarizes the changes in glucose oral agents took their usual morning dose one to two tolerance induced by chlorpropamide in the six hours before the start of the test. patients with mild pancreatic diabetes. Significant improvement in the mean fasting, 30-, and 60- METHODS minute glucose values occurred during therapy but Glucose was determined half-hourly for two hours later levels showed no significant differences. on capillary whole blood, using a Technicon Auto- Table IV outlines the effect of phenformin on Analyzer and the modified ferricyanide method of glucose tolerance in five of these mild pancreatic Hoffman (1937). Plasma insulin during the arginine diabetics when it was substituted for chlorpropamide infusions was measured by radioimmunoassay (Hales (after the latter had been withdrawn for a month). and Randle, 1963). Except for the fasting level, which showed no Gut: first published as 10.1136/gut.13.4.285 on 1 April 1972. Downloaded from Effect oforal hypoglycaemic agents on glucose tokrance in pancreatic diabetes 287 Situation Blood Glucose (mg/100 ml) qfter Glucose observations (Hollobaugh, Rao, and Kruger, 1970), Administration indicating a significant effect of phenformin in Fasting 30 Min 60 Min 90 inhibiting intestinal absorption of glucose (and Min 120 Min possibly other nutrients), suggest that its long-term Beforetherapy 107+4 217±16 273±10 240+17 201±16 use in chronic pancreatitis, with subclinical mal- After therapy 76±11 155±19 222±19 233±15 207±10 Significance <0-02 <0 05 <0 05 NS NS digestion, may require special care. With regard to the practical management of Table III Effect ofchlorpropamide on blood glucose pancreatic diabetes, some conclusions may be drawn. levels (mean ± SEM) during oral glucose tolerance tests Most patients with persistent and symptomatic in six mildpancreatic diabetics elevation offasting blood glucose levels
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