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  • 1
    ISSN: 1432-0428
    Keywords: Retinopathy ; insulin treated diabetes ; blood viscosity ; plasma viscosity ; haematocrit ; fibrinogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Blood viscosity (shear rates 100s-1 and 0.94 s-1) and several of its major determinants (haematocrit, plasma fibrinogen and plasma viscosity) have been measured in 38 male insulin-treated diabetics, aged 18–50 years, and in 38 non-diabetic control subjects matched for age and smoking habit. Diabetics without fundoscopic retinopathy (n=20) had higher mean blood viscosity than controls at the high shear rate (7.07 cP vs 6.75 cP, p〈0.05) and the low shear rate (21.2 cP vs 18.7 cP, p〈0.025). These differences persisted after correction of blood viscosity to a standard haematocrit, and were associated with increased plasma viscosity (1.41 cP vs 1.34 cP, p〈0.025) and plasma fibrinogen (2.9 g/L vs. 2.5 g/L, p〈0.025). Diabetics with retinopathy (n=18) had higher mean blood viscosity than diabetics without retinopathy at the high shear rate (7.53 cP vs 7.07 cP, p〈0.05) and the low shear rate (24.3 cP vs. 21.2 cP, p〈0.05), associated with a higher haematocrit (p〈0.05). Blood viscosity and haematocrit correlated with the duration of diabetes (r〉0.32, p〈0.05).
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0428
    Keywords: Biguanides ; phenformin ; metformin ; vitamin B12 ; intrinsic factor deficiency ; malabsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a survey of 46 randomly selected diabetic patients on biguanide therapy, 30% had malabsorption of vitamin B12. Withdrawal of the drug resulted in normal absorption in only half of those with malabsorption. In most patients with persistent malabsorption, the results of absorption tests with exogenous intrinsic factor suggested the diagnosis of coincidental intrinsic factor deficiency. Further considerations, however, led to the concept that biguanides can induce malabsorption by two different mechanisms. One of these is temporary and unrelated to intrinsic factor secretion and the other is permanent and mediated by depression of intrinsic factor secretion.
    Type of Medium: Electronic Resource
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