Diabetes mellitus and ventilatory capacity: a five year follow-up study

Area of Science:

• Pulmonary Medicine
• Endocrinology
• Epidemiology

Background:

• Diabetes mellitus (DM) is a global health concern.
• The impact of DM on respiratory health, specifically lung function decline, requires further investigation.
• Understanding the relationship between DM onset and progression and ventilatory function is crucial for comprehensive patient care.

Purpose of the Study:

• To investigate the association between diabetes mellitus and the rate of decline in lung function (FVC and FEV1).
• To compare lung function decline in subjects who developed DM during the study, those with pre-existing DM, and non-diabetic controls.
• To determine if the duration of DM influences its impact on ventilatory function.

Main Methods:

• Longitudinal observational study over five years.
• Inclusion of 200 subjects with pre-existing DM, 126 subjects who developed DM during the study, and 9,051 non-diabetic subjects.
• Statistical analysis adjusting for age, sex, height, and tobacco consumption to assess annual declines in forced vital capacity (FVC) and forced expiratory volume in one second (FEV1).

Main Results:

• Subjects who developed DM during the observation period exhibited the steepest declines in ventilatory function.
• Annual declines in FVC and FEV1 were significantly greater (29 ml and 25 ml, respectively) in new-onset DM compared to non-diabetic subjects.
• Subjects with DM throughout the observation period showed no significant difference in ventilatory function decline compared to non-diabetic subjects.

Conclusions:

• The onset of diabetes mellitus is strongly associated with an accelerated decline in lung function.
• The impact of DM on ventilatory function appears to be most pronounced at the time of diagnosis.
• Long-standing diabetes (present for several years) has a minimal effect on the rate of lung function decline.