Patient safety: Human factors engineering, safety culture, and teamwork

Modern patient safety strategies are system-based, recognizing that medical errors typically occur from failures in healthcare systems rather than individual isolated mistakes.

It only makes sense then to improve safety by using multiple systems-based approaches, including human factors engineering, strong safety culture, and effective teamwork and communication.

First up is human factors engineering, which involves designing tools, workflows, and environments around how people behave instead of how they are expected to behave.

It asks how the system can be set up, so the safest action is also the easiest one. Examples in health care include infusion pumps that block miscalculations and medication labels designed to reduce look-alike confusion.

Some hospital units are even redesigned to cut noise and distraction. Another way to approach patient safety from a human factors engineering perspective is through the hierarchy of effectiveness.

This framework ranks safety interventions based on their effectiveness from strongest to weakest, depending on how reliably they prevent error.

Strong actions change the system, so the unsafe action becomes hard or impossible to perform. Forcing functions physically prevent incorrect action.

Let's say you're at a gas station, you go to pump gas, but the nozzle doesn't fit. Then you notice that you took the diesel nozzle, but your car takes regular gasoline.

Luckily for you, diesel nozzles are usually made so they don't fit into regular gas tank openings, preventing you from making a mistake.

This is a forcing function. Examples in healthcare include how some adult medication dose vials are incompatible with pediatric IV tubing attachments.

Another example would be barcode medication scanning before administration to prevent wrong medication or wrong patient error.

Now, intermediate actions make safe behavior easier, but still allow the possibility of human error. Think of common workflow supports like medication reconciliation checklists, color-coded medications, or standardized handoff tools which identify key components of a patient's hospitalization.

Lastly, weak actions rely primarily on individuals remembering policies and staying attentive. This includes things like warning labels on medications.

Reminder emails Or policy changes without accompanying redesign of the system. Let's see how this works.

Mr. Thomas is a 68 year old man with a history of diabetes and chronic obstructive pulmonary disease, who is admitted with pneumonia and sepsis.

At the time of admission, he's started on IV antibiotics, insulin for hyperglycemia, and IV heparin for deep vein thrombosis prophylaxis.

During an evening medication pass, Nurse Patel reaches into the medication cabinet and grabs the IV heparin, which Mister Thomas already received for the day instead of his scheduled insulin.

Nurse Patel realizes this during the barcode medication scan, reports the event as a near miss, and no harm reaches the patient.

The hospital investigates and rather than reminding nurses to be more careful, they respond by using human factors engineering principles.

They start by physically separating the vials and redesigning the labels with bold color coding. Additionally, the electronic dispensing cabinet is reprogrammed, so that heparin requires a second nurse verification before release.

The unsafe option becomes much harder to pick, which is an example of a strong forcing function, thus reducing errors. Strong systems alone are not enough.

Healthcare also depends on a strong safety behavior and culture, which reflects an organization's shared values and beliefs about safety.

Modern safety culture emphasizes a just culture where individuals are held accountable for reckless behavior but not punished for honest mistakes stemming from system flaws.

Errors are openly discussed. Fear of reporting is reduced as team members are not afraid of retaliation or punishment, and the focus shifts from blame to learning and system improvement.

Excessive hierarchy in healthcare is one of the biggest barriers to adjust culture. Junior staff often hesitate to challenge senior clinicians, even when they see something wrong.

This is where crew resource management, developed in aviation comes in. By reducing hierarchical barriers, all team members feel empowered to speak up to power about patient concerns.

Encouraging open communication, actively seeking input, and responding respectfully to concerns are essential strategies for reducing the negative effects of hierarchy.

Psychological safety goes hand in hand with this approach. This is the belief that you can speak up, ask questions, admit mistakes, or challenge a decision without being humiliated or punished.

Without psychological safety, healthcare teams may develop a culture of silence where concerns go unreported and errors continue.

Let's revisit Mr. Thomas.

3 days after admission during a busy overnight shift. Nurse Brown realizes that she gave his antibiotic a few hours later than the intended time, because it was temporarily unavailable at the pharmacy.

Mr. Thomas is unharmed, but Nurse Brown is very anxious that she will get in trouble.

She brings this up with her charge nurse, who encourages her to speak up. At rounds the next morning, the charge nurse asks everyone what system factors contributed to the delay.

It turns out the pharmacy was understaffed, and there was poor communication between the nurse and the pharmacy. This discussion reflects a just culture where the error was discussed openly as a learning opportunity.

It helped identify gaps in the system such as understaffing and poor communication. The charge nurse helped promote psychological safety by encouraging feedback without humiliation or embarrassment, reducing excessive hierarchy and promoting speaking up to power.

Another systems-based approach to improving patient safety focuses on teamwork and communication. Effective teamwork reduces harm by improving communication, anticipating problems, identifying errors earlier, and responding quickly when unexpected situations occur.

Modern healthcare increasingly depends on interprofessional practice, where different healthcare workers collaborate with patients, families, caregivers and communities to deliver the highest quality of care.

So, what characteristics are essential for a high performing team? First up is a shared understanding of the goal.

Teams whose members all understand what they're trying to achieve, direct their effort toward that goal. Without it, well-meaning efforts get dispersed.

Second is role clarity. When team members have clear roles, the team can deploy its skills efficiently.

With clear roles, teams can avoid duplication or worse, unintended omissions, like each member thinking someone else was responsible for a task.

Role and responsibility confusion are common causes of safety failure. Third is team cohesion with low conflict.

When friction and distractions take hold, efforts get wasted, and team members pull back. Cohesion supports engagement and the kind of teamwork that holds up under pressure.

These characteristics show up in specific team behaviors that matter for patient safety. For example, shared mental models mean everyone holds the same picture of the clinical situation.

The team structure And each person's role. Communication is open and uses shared frames of reference.

These shared mental models also help teams maintain strong situational awareness. Situational awareness is the ability to recognize relevant clinical information, understand what it means, and anticipate how a patient's condition may change.

It is a key part of patient safety in healthcare, especially when there are multiple competing demands, such as shift changes, administrative needs, patient volume, and documentation responsibilities.

One of the biggest threats to situational awareness is distraction. This is where ideas like the sterile cockpit and the zone of silence, borrowed from aviation, come in.

These principles limit non-essential conversation, phone use, and other distractions during critical moments, like aircraft takeoff or landing, or execution of care plans and healthcare.

Now, once a concern is raised, it must be communicated clearly. Closed loop communication helps ensure that a message has been received and understood.

The sender gives instructions, the receiver repeats it back, and the sender confirms. This simple three-step process significantly reduces miscommunication during high stakes moments, like resuscitations and handoff.

Now back to Mr. Thomas.

On hospital day 6, he suddenly develops acute shortness of breath. During morning rounds, the physician assistant Kimmy noticed Mister Thomas's BP has been trending down, and his heart rate is elevated.

The respiratory therapist also noted his increased work of breathing and higher oxygen requirements overnight. Additionally, the pharmacist notes worsening renal function from morning labs.

Because the team has a shared mental model of its condition, each member recognizes the urgency in escalating care, and feels empowered to speak up.

The bedside nurse activates a rapid response using the hospital's structured communication protocol. Upon arrival of the rapid response team, the senior medical resident assumes the team leader role.

Communication is clear, organized, and closed looped. There is little distraction or extraneous noise.

BP is 84/50, the nurse says. BP is 84/50, please bolus 1 L of normal saline.

The medical resident responds. Starting a bolus of 1 L of normal saline.

Nurse practitioner Andrew notes his respiratory status is worsening. Call the intubation team SAT.

Together, because of strong situational awareness, the team works seamlessly to coordinate intubation, start vasopressors, and transfer the patient to a higher level of care.

Teamwork, role clarity, and structured communication helped everyone see Mr. Thomas's deterioration and respond effectively during a high stakes situation.

All right, as a quick recap, modern patient safety uses a systems-based approach, recognizing that medical errors typically arise from system failure rather than individual mistakes.

Human factors engineering design tools, workflows, and environments around how people behave, instead of how they're expected to behave.

So, the safest action is also the easiest one. Strong interventions like forcing functions redesign the system, whereas weak interventions rely on memory and vigilance.

A just culture where teams learn from errors instead of blaming individuals, is important for safety behavior. Finally, strong teamwork improves communication, coordination, and error recognition.