Twenty-five of thirty NIDDS who remained hypertensive (diastolic greater than 95 mmHg supine) after 4 weeks on bendrofluazide 2.5 mg daily (B), completed a single-blind, observer-blind randomized crossover study, in which the additional use of atenolol (50 mg daily) (A), slow-release nifedipine (20 mg twice daily) (N), and captopril (25 mg twice daily) (C) was compared. Patients took each drug for 8 weeks with dose doubling at 4 weeks if supine diastolic remained greater than 90 mmHg. All three combinations were more effective than bendrofluazide alone (p less than 0.01). In nine patients studied 2 h after tablets at the end of each treatment period nifedipine was more effective than the other two drugs (B:174/104 mmHg, A:162/95 mmHg, -8%, N:141/88 mmHg, -17%, C:157/94 mmHg, -10%, supine), whereas in 16 patients studied 15 h after their evening dose there was no significant difference. Fasting insulin and HbA1 levels were not significantly different between groups. No drug had a significant adverse effect on creatinine, glomerular filtration rate, overnight urinary albumin excretion or foot transcutaneous oxygen levels (43 degrees C). All three drugs studied were effective without deleterious effects on renal function or peripheral blood flow.
One hundred diabetics were investigated for the accuracy and reproducibility with which they delivered a mixture of insulins. In contrast with previous reports, 80 patients delivered their total dose with a bias less than 5% from the prescribed dose and 87 with a CV less than 5%. There was little deterioration with age. The proportions of short- and intermediate-acting insulin prescribed were also delivered with commendable skill. In a separate study, syringe dead space was shown to incur a potential financial loss through insulin wastage, as well as affecting the proportions of short- and intermediate-acting insulins delivered.
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