What every intensivist should know about handovers in the intensive care unit

Handover, the act of transferring information and accountability between clinicians, is recognized by the World Health Organization(1) and critical care societies(2) as one of the key elements of quality and safety. With changes in residents’ working hours in the past years in the United States,(3) the number of handovers increased considerably, and a vast body of literature now exists for both critical care and postoperative patients.(4) Poor communication during handovers is associated with an increase in medical errors and adverse events,(5-7) and several tools and interventions exist to improve communication and reduce medical errors.(8) Critical care units and postoperative recovery units are strategic areas where patients are more vulnerable to communication breakdowns, given the complexity of these areas and the multiple team transitions that occur during patient care.(5)

team members asking for directions on non-urgent aspects of care), disorganized information (such as critical blood work or vital signs that are not readily available for discussion), and reliance on memory. (14) The corruption of information may occur due to poor construction of the message (e.g., use of jargon, inaccurate word choice) or due to cognitive biases, such as when patients have an unclear diagnosis and are described as having an established diagnosis during handover.
In many situations, the conversation on handovers is unidirectional, in which the person handing over the patient describes the clinical situation and the current treatments. However, in complex patients with many diagnoses and clinical uncertainties, simple one-way communication may not be enough. Even with the accurate information and proper language for an adequate handover process, it may not be possible to provide a full comprehension of the most important and uncertain aspects of a patient's clinical course. In these situations, two-way communication with both parties, discussing the diagnosis and treatments from different perspectives, allows for a new construction of the clinical scenario, which may have a positive impact on the communication process. (15) In a recent study of cross-covering nighttime clinicians, when patients were cared for at night by an incoming clinician that did not participate in their care during the day, they were more likely to have more diagnostic tests and changes in treatment overnight, and they had a lower mortality. These data suggest that the incoming clinician's different perspective may have helped them identify the problems that were overlooked by the daytime clinicians. (13) Once we acknowledge this crucial function of re-thinking about the patient during handovers, it is clear that we need to focus not only on what information is communicated but also on the interactions between clinicians during a handover.
In the ICU setting, there are several barriers that impact the effectiveness and safety of the handover (Table 1).

Memory aids
The most basic and efficient level of improvement is to use memory aids. These can take many forms, from a simple note-taking process during handovers to "low-tech" solutions, such as electronic documents that exist locally in the ICU computer, to more complex handover systems that integrate with electronic medical records. The basic tenet is to avoid reliance on memory. A commonly used method is to develop a handover-specific form; in a recent systematic review, this was the most commonly used intervention; (16) however, the quality of the evidence of these studies is limited.

Standardization of handovers
Although strategies with mnemonics have shown mostly conflicting results or were described in studies of poor quality, (15) they continue to proliferate in the handover literature; a systematic review of handover mnemonics resulted in the identification of twenty-four different mnemonics up to 2009. (17) The best evidence comes from a recent before-after study of a new mnemonic (I-PASS), where the use of standardization resulted in a 23% decrease in medical errors in a pediatric population. (8) Care must be taken, however, to adopt this approach, as the implementation was very complex, including several technological components, which limits the generalizability of the tool. In spite of the limited evidence to support standardization, teams should be encouraged to consider standardizing elements of handover, paying special attention to commonly missed and important information in their own settings.

Handover protocols
Many institutions have focused on developing structured handover protocols to minimize errors, borrowing strategies from the automotive industry, such as Six-Sigma, or from Formula-One to improve handovers to the ICU; (10) both strategies have the standardization