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Abstract
Introduction
The South Thames Retrieval Service (STRS) is a specialised paediatric intensive care
retrieval service, integrated into the Evelina Children's Hospital, the lead centre
in the South Thames Region, London. Over the last 5 years a number of initiatives
have been adopted to reduce mobilisation times (the time from retrieval acceptance
and activation to departure from the lead centre) and improve service delivery to
surrounding district general hospitals (DGHs). The aim of this study was to evaluate
whether these initiatives led to a reduction in mobilisation time between January
2002 and December 2006.
Methods
The STRS covers 24 DGHs within an 80 mile range serving a population of 1.6 million
children in the South Thames region of Greater London. All calls to the service were
logged on a detailed database. Retrieval requests for potential PICU patients were
triaged and coordinated via a retrieval-specific telephone line. Once accepted, the
onsite retrieval team was mobilised and dispatched via a dedicated ambulance to the
DGH. Mobilisation includes assimilating and checking pre-packed equipment bags (ventilators,
drugs, intubation kit, monitors, and so on) and organising a team of at least one
retrieval nurse, doctor and ambulance driver. Details of each retrieval request to
the STRS, including the time of the call, were captured on a database containing the
patient demographic and clinical details. The interval between accepting the patient
for retrieval and team departure from the unit was termed the 'mobilisation time'
(minutes). Data were analysed over two time periods, before (n = 976 retrievals) and
after 2004 (n = 1,785), coincident with a dedicated ambulance and driver on site.
Nonparametric tests were used for continuous data (Kruskall–Wallis test or Mann–Whitney
test) and the chi-squared test for categorical 2 × 2 comparisons.
Results
A total of 2,761 retrievals (median age 12 months, 78% ventilated) were performed
and included for analysis during the study period, 33 were excluded (missing mobilisation
times (n = 30) or elective transfers (n = 3). Figure 1 shows the process introduced
to improve mobilisation times with a dedicated onsite ambulance service in 2004. There
was a significant reduction in mobilisation time from 2002 to 2006 from 55 minutes
(IQR 35–80) to 30 minutes (IQR 25–50), P < 0.0001 (Kruskall–Wallis) (Figure 2). When
comparing pre-2004 and post-2004 time periods, the median mobilisation time was significantly
lower after 2004 with a fall from 45 minutes (IQR 30–70) to 35 minutes (IQR 27–55).
There was also a significant increase in the incidence of sub-30-minute mobilisation
times, which almost doubled after 2004 with the availability of an onsite dedicated
ambulance service (14.3% to 25.9%, P < 0.0001).
Figure 1
Processes introduced to improve mobilisation times.
Figure 2
Median retrieval mobilisation times.
Conclusion
There has been a significant decrease in the mobilisation time of the STRS over the
last 5 years. Although the presence of an onsite ambulance service in 2004 had a significant
impact on reducing retrieval mobilisation times, a number of other factors and initiatives
contributed to steadily reducing mobilisation times over the study period.