Study Participants
The study was conducted in the department of respiratory medicine,
Chettinad Hospital. Thirty patients with obstructive pulmonary diseases
who attend outpatient services at the department of respiratory medicine
between August 2019 to March 2020 were enrolled in the study. Inclusion
criteria for the study: diagnosis of COPD by the physician, prescribed
to take salbutamol through metered-dose inhaler salbutamol at least for
the previous 12 months. Patients who were using other inhaler devices
other than MDI and those who do not have to follow up details at least
for the previous 12 months were excluded. All eligible patients were
enrolled in the study after obtaining informed consent.