[Dosage aerosols; problems with the inhalation technic].

The inhalation techniques of 77 patients using a dosing aerosol were videotaped before, immediately after and (in 55 cases) three weeks after they viewed an instruction video tape. The inhalation technique was assessed on 9 points. Before the instruction only 2% had a correct and 49% a completely faulty technique. After instruction, these figures were 65% and 13%, respectively. After three weeks, 12% were found to have regressed to only partially correct use.