False alarms in very low birthweight infants: comparison between three intensive care monitoring systems

Monitor alarms are a major burden on both patients and staff in intensive c are units. We compared alarm rates from three different monitor systems (He wlett Packard (HP), Kontron Instruments (KI), Marquette-Hellige (MH)) in a tertiary neonatal intensive care unit. Monitors were used in random order o n three consecutive days over 8 h each in 16 preterm infants (median gestat ional age at birth 29 wk (range 24-34), age at study 18 d (8-53), weight at study 1160 g (595-1430)). Alarms were classified as true or false using fl out sheets based on continuous observation of both the patient and related parameters. There was one alarm every 9 min of monitoring. The median numbe r of true alarms did not differ significantly between systems, being 28 per 8 h (range 9-87) for HP, 26 (3-81) for KI, and 30 (5-135) for MI-I. The me dian number of false alarms differed widely, with the HP system generating 32 (7-77) such alarms per 8 h, compared to 8 (0-19) for KI and 15 (2-32) fo r MH (p < 0.01 HP vs KI and MH, p < 0.05 KI vs MH). These differences betwe en systems were mainly due: to differences in pulse oximeter and transcutan eous PO2 monitor alarm rates. Conclusions: In conclusion,this study shows marked differences between both parameters and manufacturers in the frequency with which false alarms occu r. It may provide a basis from which reductions in alarm rates can be sough t.