Related Experiment Video
Updated: Feb 16, 2026
Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit
Published on: September 6, 2024
[Clinical evaluation of alarm efficieny in intensive care]
L Biot1, P Y Carry, J P Perdrix
1Département d'anesthésie-réanimation, centre hospitalier Lyon Sud, Pierre-Bénite, France.
Objective:
To evaluate the efficiency of haemodynamic and respiratory monitoring system by a clinical analysis of the alarms.
Study Design:
Observational prospective study.
Patients:
25 patients who presented acute respiratory distress syndrome and who were monitored with haemodynamic and respiratory monitoring.
Methods:
Each minute, a bedside clinical observer analysed alarms from the monitoring according to detection or absence to clinical events. Four situations were defined to statistical descriptive analysis: a) false positive (FP); b) true positive (TP); c) false negative (FN); and d) true negative (TN). True positive alarm which induced consequences on patients care were also analysed.
Results:
15,013 minutes allowed the recordings of 3,665 alarms, 44% from arterial pressure, 17% from SpO2 and 12% from airways maximal pressure. 46% were false positive alarms inducing a noisy pollution. The positive predictive value PPV = TP/(TP + FP) of these alarms were respectively 51% for arterial pressure, 18% for SpO2 and 100% for Paw. Only 5% of true positive alarms induced consequences on patients care.
Conclusion:
This protocol allowed the evaluation of monitoring efficiency. This kind of evaluation may help to improve monitoring capacity with reducing noisy pollution from false positive alarms.
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