Most of a hospital’s work is invisible to patients, but one moment repeats hundreds of times a day and quietly determines whether care holds together: the handoff. A nurse changing shift, a patient moving from the emergency department to a ward, a resident signing out overnight - each is a transfer of responsibility, and each is a chance for a critical detail to fall through the gap. The data says the gap is where much of the harm lives.
The size of the problem
When The Joint Commission analyzed the root causes of sentinel events - the most serious, often fatal, safety failures - reported between 1995 and 2005, breakdowns in communication were a contributing cause in roughly two-thirds of them. Recognizing handoffs specifically as a hazard, the Commission later issued Sentinel Event Alert 58, “Inadequate hand-off communication” (2017), defining a handoff as:
“a transfer and acceptance of patient care responsibility achieved through effective communication. It is a real-time process of passing patient-specific information from one caregiver to another […] to ensure the continuity and safety of the patient’s care.”
The framing matters: a handoff is not just telling; it is a transfer that is only complete when the receiver has genuinely accepted the information.
SBAR: a script borrowed from a submarine
The first widely adopted fix was SBAR - Situation, Background, Assessment, Recommendation. Its origin is telling. SBAR was adapted for healthcare at Kaiser Permanente by Doug Bonacum, a former US Navy nuclear-submarine safety officer, working with physician Michael Leonard and colleagues. On a submarine, ambiguous communication can be fatal, so the Navy had drilled a terse, standard format for conveying a situation and a recommendation. Bonacum’s insight was that an operating room or a night-shift phone call needed the same discipline.
SBAR’s power is that it flattens hierarchy just enough: by ending with an explicit Recommendation, it gives a junior nurse a socially safe structure to tell a senior physician what she thinks should happen. But the evidence is honest about limits. AHRQ’s review characterizes the outcome data for SBAR as “mixed,” with the clearest benefits appearing when SBAR is part of a broader safety bundle rather than used alone.
I-PASS: the version with a randomized-quality result
The strongest evidence for structured handoffs comes from I-PASS, a mnemonic that expands the conversation into five parts: Illness severity, Patient summary, Action list, Situation awareness and contingency planning, and Synthesis by receiver - that final “S” being the receiver reading back the plan to confirm it landed.
In a landmark study across nine hospitals covering 10,740 admissions, implementing I-PASS was followed by a 23% reduction in the medical-error rate (from 24.5 to 18.8 per 100 admissions) and a 30% reduction in preventable adverse events (from 4.7 to 3.3 per 100 admissions), while non-preventable adverse events did not change - exactly the pattern you would expect if the handoff itself was the lever (Starmer et al., New England Journal of Medicine, 2014).
That control finding is what elevates I-PASS above anecdote. The intervention moved the harm that should be preventable through better information transfer, and left untouched the harm that no conversation could prevent.
What the evidence asks of you
Two practical lessons follow. First, standardize the structure, not just the intent - “give a good handoff” is not a process; “always synthesize back the plan” is. Second, the read-back is not a formality. The most reliable step in both methods is the moment the receiver restates the plan, because that is where a silent misunderstanding becomes an audible one, in time to fix it.
A handoff done well costs perhaps thirty extra seconds. The 2014 data suggests those seconds are among the highest-return time a hospital can spend.
Sources
- Starmer AJ, et al. “Changes in Medical Errors after Implementation of a Handoff Program.” New England Journal of Medicine, 2014;371(19):1803-1812. https://pubmed.ncbi.nlm.nih.gov/25372088/
- The Joint Commission, Sentinel Event Alert 58, “Inadequate hand-off communication,” 2017. https://www.jointcommission.org/en-us/knowledge-library/newsletters/sentinel-event-alert/issue-58
- AHRQ Patient Safety Network, “Handoffs and Signouts” (Patient Safety Primer). https://psnet.ahrq.gov/primer/handoffs-and-signouts
- “I-PASS, a Mnemonic to Standardize Verbal Handoffs” (review). https://pmc.ncbi.nlm.nih.gov/articles/PMC9923540/
- WHO Collaborating Centre for Patient Safety Solutions, “Communication During Patient Hand-Overs,” 2007. https://cdn.who.int/media/docs/default-source/patient-safety/patient-safety-solutions/ps-solution3-communication-during-patient-handovers.pdf