Change in asthma control over time: predictors and outcomes.

Area of Science:

• Pulmonary Medicine
• Clinical Research
• Asthma Management

Background:

• National asthma guidelines emphasize maintaining control, yet longitudinal studies on asthma control are limited.
• Understanding the natural history of asthma control is crucial for effective patient management.

Purpose of the Study:

• To evaluate the impairment domain of asthma control longitudinally in persistent asthma patients.
• To identify predictors and consequences of achieving or failing to achieve asthma control over time.

Main Methods:

• A cohort of 18-56 year olds with persistent asthma completed quarterly surveys (November 2007-October 2008).
• The Asthma Control Test (ACT) and other patient/asthma characteristics were assessed via surveys.
• Health care utilization, including pharmacy records and exacerbations, was obtained from administrative data for 2008.

Main Results:

• Patients with well-controlled asthma at baseline were highly likely to maintain control (76.2%-80.4%) over the year.
• Conversely, patients with uncontrolled asthma at baseline had lower rates of sustained control (33.5%-36.9%).
• Improvement in asthma control early in follow-up correlated with significantly fewer exacerbations in the subsequent year.

Conclusions:

• Initial asthma control status is a strong predictor of future control and asthma exacerbations.
• Patients with uncontrolled or poorly controlled asthma necessitate intensive management strategies.
• Achieving and maintaining asthma control over time is critical for reducing exacerbations and improving patient outcomes.