Using telemonitoring to construct knowledge about homebound patient populations: vital-signs alert rates

Three home health agencies conducted daily telemonitoring of patients in western Montana. The agencies all used monitoring equipment of the same type, which provided up to six vital-signs measurements (heart rate, oxygen saturation, systolic blood pressure, diastolic blood pressure, glucose and bodyweight). There were 337 patients in all, two-thirds of whom were female. These patients were monitored for a total of 16,999 person-days. The rate of occurrence of any vital-sign measurement falling outside acceptable ranges was 33.8 per patient per 60-day period. The highest alert rate for a specific vital sign was for decreased SpO(2) (6.4 per patient per 60-day period). The central station nurse took follow-up action at a rate of 26.0 per patient per 60-day period; case manager nurses took follow-up action at a rate of 8.2 per patient per 60-day period. There were some differences between male and female patients in the alert rates, and between the agencies. The alert rates measured in the present study are expected to be useful to home care administrators in estimating the staffing requirements for telemonitoring.