Risk for Cardiorespiratory Instability Following Transfer to a Monitored Step-Down Unit

Area of Science:

• Critical Care Medicine
• Cardiorespiratory Monitoring
• Patient Outcomes

Background:

• Hospitalized patients experiencing cardiorespiratory instability (CRI) exhibit poorer outcomes.
• Understanding CRI onset in step-down units (SDUs) is crucial for improving patient care.

Purpose of the Study:

• To characterize admission factors, identify drivers, and determine the time to initial CRI events in monitored SDU patients.

Main Methods:

• Continuous monitoring data (307 subjects) were analyzed to classify CRI events based on vital sign deviations.
• CRI drivers were identified as the first vital sign to cross instability thresholds.
• Time to onset and duration of initial CRI epochs were calculated.

Main Results:

• Patients transferred from higher-monitoring units were more likely to experience CRI (44% vs 31%).
• Initial CRI events were frequently driven by oxygen saturation (SpO2), while breathing rate was the most common overall driver.
• CRI events correlated with significantly longer hospital (11.3 vs 7.8 days) and SDU stays (6.1 vs 3.5 days).

Conclusions:

• Initial CRI events, commonly linked to SpO2, are associated with prolonged SDU and hospital stays.
• Enhanced monitoring of SDU patients, particularly those transferred from ICUs, is warranted.
• Focusing on SpO2 and breathing frequency may help anticipate and manage CRI events.