Diabetes Care, Vol 18, Issue 8 1183-1186, Copyright © 1995 by American Diabetes Association
Comparison of bedtime NPH or preprandial regular insulin combined with glibenclamide in secondary sulfonylurea failure
L Landstedt-Hallin, U Adamson, P Arner, J Bolinder and PE Lins
Department of Internal Medicine, Danderyd Hospital, Sweden.
OBJECTIVE--To compare the effect of bedtime NPH insulin or preprandial
regular insulin combined with glibenclamide on metabolic control in
non-insulin-dependent diabetes mellitus (NIDDM) patients with secondary
failure to sulfonylurea therapy. RESEARCH DESIGN AND METHODS--Eighty NIDDM
patients were randomized to treatment with either three preprandial doses
of regular insulin (daytime group D) or a bedtime dose of NPH insulin
(nocturnal insulinization, group N), both regimens being combined with 10.5
mg of glibenclamide. Metabolic profiles were obtained at 0, 6, 16 weeks.
RESULTS--Glycemic control had improved significantly in both groups after 4
months. Fasting blood glucose was significantly lower compared with
baseline in both groups. The mean change +/- SD in group D was -2.8 +/- 3.5
mmol/l and in group N -6.4 +/- 3.0 mmol/L, the reduction being more
pronounced in group N compared with group D (P < 0.0001). HbA1c was
lowered similarly, from 9.2 +/- 1.4 to 7.1 +/- 1.2% in group D (P <
0.0001) and from 9.1 to 1.1 to 7.5 +/- 1.5% in group N (P < 0.0001). The
total daily insulin doses were similar, 29 +/- 11 U in group D and 26 +/- 9
U in group N, and the circulating insulin levels during daytime were higher
in group D than in group N. Total serum cholesterol and triglycerides were
similarly and significantly lowered compared with baseline in both groups.
Weight gain was more pronounced in group D (3.4 +/- 0.3 kg) than in group N
(1.9 +/- 1.9 kg; D vs. N, P < 0.002), and the change was inversely
correlated with initial eight but not with the improvement in HbA1c.
CONCLUSIONS--The two insulin regimens exert similar effect on glucose
metabolism and serum lipids in NIDDM patients on combination therapy.
Weight gain is more pronounced in patients given insulin during the daytime
when preprandial doses of short-acting insulin are used.