TY - JOUR
T1 - A review, and performance evaluation, of single-parameter “track and trigger” systems
AU - Smith, G.
AU - Prytherch, David
AU - Schmidt, P.
AU - Featherstone, P.
AU - Higgins, Bernard
N1 - Projects:
CHMI.
Health informatics.
Clinical outcome modelling.
PY - 2008/10
Y1 - 2008/10
N2 - Objectives: There is no up-to-date literature review of physiologically-based, single-parameter weighted “track and trigger” systems (SPTTS) and little data on their sensitivity and specificity to predict adverse outcomes. The aim of this study was to describe the SPTTS in clinical use and measure their sensitivity and specificity when using admission vital signs data for predicting in-hospital mortality. Materials and methods: We performed a systematic review of the literature to describe the SPTTS, their components and their differences. We measured their sensitivity and specificity for predicting in-hospital mortality when using a database of 9987 admission vital signs datasets. Results: We identified 39 unique classes of SPTTS, of which 30 were evaluated. There was considerable variation in the physiological variables used, together with significant variation in the physiological values used to trigger a medical emergency or critical care outreach team. There was marked variation in sensitivity (7.3–52.8%), specificity (69.1–98.1%), positive predictive values (13.5–26.1%), negative predictive values (92.1–94.2%) and the potential number of calls triggered (234–3271). Conclusions: There is a wide range of unique, but very similar, SPTTS in clinical use. Although specificities were high, sensitivities were too low to provide institutions with confidence that these SPTTS could identify patients at risk of in-hospital death using admission vital signs. Institutions may wish to consider these data when selecting which, if any, single-parameter track and trigger systems to introduce.
AB - Objectives: There is no up-to-date literature review of physiologically-based, single-parameter weighted “track and trigger” systems (SPTTS) and little data on their sensitivity and specificity to predict adverse outcomes. The aim of this study was to describe the SPTTS in clinical use and measure their sensitivity and specificity when using admission vital signs data for predicting in-hospital mortality. Materials and methods: We performed a systematic review of the literature to describe the SPTTS, their components and their differences. We measured their sensitivity and specificity for predicting in-hospital mortality when using a database of 9987 admission vital signs datasets. Results: We identified 39 unique classes of SPTTS, of which 30 were evaluated. There was considerable variation in the physiological variables used, together with significant variation in the physiological values used to trigger a medical emergency or critical care outreach team. There was marked variation in sensitivity (7.3–52.8%), specificity (69.1–98.1%), positive predictive values (13.5–26.1%), negative predictive values (92.1–94.2%) and the potential number of calls triggered (234–3271). Conclusions: There is a wide range of unique, but very similar, SPTTS in clinical use. Although specificities were high, sensitivities were too low to provide institutions with confidence that these SPTTS could identify patients at risk of in-hospital death using admission vital signs. Institutions may wish to consider these data when selecting which, if any, single-parameter track and trigger systems to introduce.
KW - emergency medical services
KW - medical emergency team
KW - monitoring
KW - outcome
KW - prevention
U2 - 10.1016/j.resuscitation.2008.05.004
DO - 10.1016/j.resuscitation.2008.05.004
M3 - Article
SN - 0300-9572
VL - 79
SP - 11
EP - 21
JO - Resuscitation
JF - Resuscitation
IS - 1
ER -