Risk events during intrahospital transport of patients from the emergency department: a prospective observational study

BackgroundWe aimed to determine the incidence, nature of and predisposing factors for risk events (REs) that occur during the intrahospital transport of patients from the ED.MethodsWe undertook a prospective, observational study of intrahospital patient transports from a single ED between 30 January and 20 March 2020. An investigator attended each transport and recorded any RE on a specifically designed data collection document. An RE was any mishap, even if not foreseen, that had the potential to cause the patient harm. A patient equipment number was assigned based on the number of pieces of equipment required during the transport. Poisson regression generated incidence rate ratios (IRRs) and determined risk factors for REs.ResultsOf 738 transports, 289 (39.1%, 95% CI 35.6% to 42.8%) had at least one RE. The total of 521 REs comprised 125 patient-related, 279 device-related and 117 line/catheter-related REs. The most common included trolley collisions (n=142), intravenous fluid line catching/tangling (n=93), agitation/aggression events (n=31) and cardiac monitoring issues (n=31). Thirty-four (6.5%) REs resulted in an undesirable patient outcome, most commonly distress and pain. Predisposing factors for REs included an equipment number ≥3 (IRR 5.68, 95% CI 3.95 to 8.17), transport to a general ward (IRR 2.68, 95% CI 2.12 to 3.39), hypertension (IRR 1.93, 95% CI 1.07 to 3.50), an abnormal temperature and a GCS<14.ConclusionsREs are common in transport of patients from the ED and can result in undesirable patient outcomes. Adequate pre-transfer preparation, especially securing equipment and lines, would result in a reduced risk.

Detrimental effects of intrahospital transport on cerebral metabolism in patients suffering severe aneurysmal subarachnoid hemorrhage

OBJECTIVE Intrahospital transport for CT scans is routinely performed for neurosurgical patients. Particularly in the sedated and mechanically ventilated patient, intracranial hypertension and blood pressure fluctuations that might impair cerebral perfusion are frequently observed during these interventions. This study quantifies the impact of intrahospital patient transport on multimodality monitoring measurements, with a particular focus on cerebral metabolism. METHODS Forty intrahospital transports in 20 consecutive patients suffering severe aneurysmal subarachnoid hemorrhage (SAH) under continuous intracranial pressure (ICP), brain tissue oxygen tension (pbtO2), and cerebral microdialysis monitoring were prospectively included. Changes in multimodality neuromonitoring data during intrahospital transport to the CT scanner and the subsequent 10 hours were evaluated using linear mixed models. Furthermore, the impact of risk factors at transportation, such as cerebral vasospasm, cerebral hypoxia (pbtO2 < 15 mm Hg), metabolic crisis (lactate-pyruvate ratio [LPR] > 40), and transport duration on cerebral metabolism, was analyzed. RESULTS During the transport, the mean ICP significantly increased from 7.1 ± 3.9 mm Hg to 13.5 ± 6.0 mm Hg (p < 0.001). The ICP exceeded 20 mm Hg in 92.5% of patients; pbtO2 showed a parallel rise from 23.1 ± 13.3 mm Hg to 28.5 ± 23.6 mm Hg (p = 0.02) due to an increase in the fraction of inspired oxygen during the transport. Both ICP and pbtO2 returned to baseline values thereafter. Cerebral glycerol significantly increased from 71.0 ± 54.9 µmol/L to 75.3 ± 56.0 µmol/L during the transport (p = 0.01) and remained elevated for the following 9 hours. In contrast, cerebral pyruvate and lactate levels were stable during the transport but showed a significant secondary increase 1–8 hours and 2–9 hours, respectively, thereafter (p < 0.05). However, the LPR remained stable over the entire observation period. Patients with extended transport duration (more than 25 minutes) were found to have significantly higher levels of cerebral pyruvate and lactate as well as lower glutamate concentrations in the posttransport period. CONCLUSIONS Intrahospital transport and horizontal positioning during CT scans induce immediate intracranial hypertension and an increase in cerebral glycerol, suggesting neuronal injury. Afterward, sustained impairment of neuronal metabolism for several hours could be observed, which might increase the risk of secondary ischemic events. Therefore, intrahospital transport for neuroradiological imaging should be strongly reconsidered and only indicated if the expected benefit of imaging results outweighs the risks of transportation.