Improvement of inhaler efficacy by home-made spacer.

Abstract

The delivery of aerosol from a metered dose inhaler (MDI) was reported to be more efficient with a spacer. Hence, a home-made spacer modified from a 950 ml low cost plastic bottle, was compared with a MDI and with a 750 ml imported spacer (Nebuhaler). On three consecutive days, at the same time of day, 20 adult patients with chronic asthma inhaled two puffs of terbutaline sulphate (0.5 mg), delivered from MDI alone, MDI with a 750 ml Nebuhlaer and MDI with a home-made spacer. The following measurements were made: forced expiratory volume in one second (FEV1), forced vital capacity (FVC) and pulse rate. These measurements were carried out immediately before and at 5, 20, 60 min after inhalation of terbutaline. FEV1 was significantly increased (P < 0.05) at 5, 20 and 60 min after administration of terbutaline with MDI via either spacers than with MDI alone but no significant difference was observed between Nebuhaler and the home-made spacer. FVC and pulse rate showed no significant change with each method of administration. In conclusion, terbutaline delivered by MDI and home-made spacer was more effective in bronchodilatation than by MDI alone and was just as effective as MDI and Nebuhaler. The home-made spacer therefore offers a simple, inexpensive and more effective method for delivering aerosol drug.