Use of inhaled insulin in a basal/bolus insulin regimen in type 1 diabetic subjects: a 6-month, randomized, comparative trial.
OBJECTIVE
Despite the demonstrated benefits of glycemic control, patient acceptance of basal/bolus insulin therapy for type 1 diabetes has been slow. We investigated whether a basal/bolus insulin regimen involving rapid-acting, dry powder, inhaled insulin could provide glycemic control comparable with a basal/bolus subcutaneous regimen.


METHODS
Patients with type 1 diabetes (ages 12-65 years) received twice-daily subcutaneous NPH insulin and were randomized to premeal inhaled insulin (n = 163) or subcutaneous regular insulin (n = 165) for 6 months.


RESULTS
Mean glycosylated hemoglobin (A1C) decreased comparably from baseline in the inhaled and subcutaneous insulin groups (-0.3 and -0.1%, respectively; adjusted difference -0.16% [CI -0.34 to 0.01]), with a similar percentage of subjects achieving A1C <7%. Although 2-h postprandial glucose reductions were comparable between the groups, fasting plasma glucose levels declined more in the inhaled than in the subcutaneous insulin group (adjusted difference -39.5 mg/dl [CI -57.5 to -21.6]). Inhaled insulin was associated with a lower overall hypoglycemia rate but higher severe hypoglycemia rate. The overall hypoglycemia rate (episodes/patient-month) was 9.3 (inhaled) vs. 9.9 (subcutaneous) (risk ratio [RR] 0.94 [CI 0.91-0.97]), and the severe hypoglycemia rate (episodes/100 patient-months) was 6.5 vs. 3.3 (RR 2.00 [CI 1.28-3.12]). Increased insulin antibody serum binding without associated clinical manifestations occurred in the inhaled insulin group. Pulmonary function between the groups was comparable, except for a decline in carbon monoxide-diffusing capacity in the inhaled insulin group without any clinical correlates.


CONCLUSIONS
Inhaled insulin may provide an alternative for the management of type 1 diabetes as part of a basal/bolus strategy in patients who are unwilling or unable to use preprandial insulin injections.
Skyler
Jay S
JS
University of Miami, School of Medicine, Miami, FL 33136, USA. jskyler@miami.edu
Weinstock
Ruth S
RS
Raskin
Philip
P
Yale
Jean-François
JF
Barrett
Eugene
E
Gerich
John E
JE
Gerstein
Hertzel C
HC
D000280:Administration, Inhalation; D000293:Adolescent; D000328:Adult; D000368:Aged; D001835:Body Weight / Q000187:drug effects; D002096:C-Peptide / Q000097:blood; D002648:Child; D003922:Diabetes Mellitus, Type 1 / Q000188:drug therapy* / Q000503:physiopathology; D004334:Drug Administration Schedule; D005260:Female; D006442:Glycated Hemoglobin / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D007003:Hypoglycemia / Q000139:chemically induced / Q000453:epidemiology; D007279:Injections, Subcutaneous; D007328:Insulin / Q000008:administration & dosage* / Q000009:adverse effects / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D012129:Respiratory Function Tests
D002096:C-Peptide; D006442:Glycated Hemoglobin; D007328:Insulin