Study objective: To evaluate the validity of spirometry self-testing during home telemonitoring and to assess the acceptance of an Internet-based home asthma telemonitoring system by asthma patients. Design: We studied an Internet-based telemonitoring system that collected spirometry data and symptom reports from asthma patients' homes for review by physicians in the medical center's clinical information system. After a 40-min training session, patients completed an electronic diary and performed spirometry testing twice daily on their own from their homes for 3 weeks. A medical professional visited each patient by the end of the third week of monitoring, 10 to 40 rain after the patient had performed self-testing, and asked the patient to perform the spirometry test again under his supervision. We evaluated the validity of self-testing and surveyed the patients attitude toward the technology using a standardized questionnaire. Setting: Telemonitoring was conducted in patients' homes in a low-income inner city area. Patients: Thirty-one consecutive asthma patients without regard to computer experience. Measurement and results: Thirty-one asthma patients completed 3 weeks of monitoring. A paired t test showed no difference between unsupervised and supervised home spirometry self-testing. The variability of FVC (4.1%), FEV1 (3.7%), peak expiratory flow (7.9%), and other spirometric indexes in our study was similar to the within-subject variability reported by other researchers. Despite the fact that the majority of the patients (71%) had no computer experience, they indicated that the self-testing was 'not complicated at all' or only 'slightly complicated'. The majority of patients (87.1%) were strongly interested in using home asthma telemonitoring in the future. Conclusions: Spirometry self-testing by asthma patients during telemonitoring is valid and comparable to those tests collected under the supervision of a trained medical professional. Internet-based home asthma telemonitoring can be successfully implemented in a group of patients with no computer background.
- Peak expiratory flow