CRM in Emergency Medical Services: How it Improves Patient Safety

What is Crew Resource Management (CRM)? 

Crew Resource Management, CRM for short, refers to a training and operational framework designed to make optimal use of all available resources within a team in order to prevent errors and enhance patient safety. This refers not just to technical auxiliary equipment or medical equipment, but above all to human resources: expertise, communication, team dynamics, situational awareness, and decision-making under pressure.

The term “crew” was chosen deliberately: it highlights the constructive, team-oriented nature of the concept. Every team member shares responsibility – regardless of their position in the hierarchy or level of experience.

The roots of CRM lie in civil aviation. In the late 1970s, aviation safety experts realized that most aviation accidents were not caused by technical failures but by communication and teamwork issues in the cockpit – the human factor came to the forefront.

In 1992, Howard and Gaba applied the concept to anesthesia for the first time and developed what is known as ACRM – Anesthesia Crisis Resource Management. This laid the groundwork for systematically establishing CRM in the medical field. Since then, the concept has proven its worth in numerous areas of acute and emergency medicine, and today it has become an indispensable part of emergency medical services.¹

Why CRM is indispensable in emergency medical services

According to scientific estimates, 70–80% of all medical errors can be attributed to human factors – that is, factors such as perception, communication, decision-making, and team dynamics. This makes people the biggest source of error, but at the same time also the most crucial resource in emergency responses.²

Communication as a critical safety factor

Recent data demonstrates just how serious these factors are: a comprehensive analysis by the University of Leicester (2025) makes it clear that poor communication is not a marginal issue, but rather a root cause of risks.³

• Error catalyst: In approximately 37% of all medical errors directly related to diagnosis or treatment, inadequate communication is considered a contributing or facilitating factor. 
• Adverse events: In more than 40% of serious incidents in the healthcare sector, a disruption in the flow of information plays a key role. 
• Internal risk: While communication with patients is often the focus, a significant proportion of the problems (over 22%) stem from coordination issues within medical teams.

The fixation phenomenon

Added to this is a factor that is often underestimated: the fixation phenomenon. It describes the tendency of emergency responders to focus on a single diagnosis or course of action when under stress. This can cause one to lose sight of the bigger picture. This phenomenon is common in everyday prehospital practice and is often not fully recognized.⁴

Ad-hoc teams working under intense pressure

Emergency responders also work under extreme physical and mental stress and must make life-or-death decisions in a matter of seconds. Added to this are significant time pressures and, in many cases, challenging external conditions. It is not uncommon for teams to come together who have never worked together before – without joint training sessions or established routines. Such ad-hoc arrangements require a shared understanding of procedures. 

This is exactly where Crew Resource Management comes in: it provides not only theoretical guidelines, but also a practical, structured framework for action. By using targeted techniques such as the “10-for-10 rule” or “closed-loop communication”, typical patterns of error can be identified early on and actively addressed.

The content and objectives of CRM in emergency medical services

CRM in emergency medical services is a holistic approach that systematically improves team performance in high-stress situations. The content of the CRM can be divided into two closely interrelated areas: 

1. Specific action goals that guide the team as they work.
2. Field-tested guiding principles that serve as a reliable framework for guidance.

Together, these two aspects make CRM an effective tool for patient safety – not in spite of, but precisely because of the pressure under which emergency responders work every day.

Key objectives of CRM

CRM has the following objectives:

• Better communication forms the foundation for all other CRM initiatives. Errors rarely stem from a lack of technical knowledge; instead, they more often result from misleading, incomplete, or unspoken information. CRM establishes standardized communication formats that work even under pressure. 
• More effective cooperation means that every team member understands their role, tasks are assigned appropriately, and mutual oversight is viewed as a safety net rather than a sign of mistrust. A shared understanding of collaboration is essential, especially in ad-hoc teams.⁵
• Enhanced situational awareness describes the ability to continuously assess, evaluate, and dynamically adapt to the overall situation during a mission. Those who focus solely on the immediate problem lose sight of the bigger picture – with potentially disastrous consequences.⁶
• Clear leadership and decision-making ensure that, during operations, it is always clear who is in charge, who makes the decisions, and who is authorized to voice concerns – regardless of rank or how anyone is feeling that day.

An overview of the 15 CRM guiding principles according to Rall and Gaba

At the heart of CRM in emergency medical services are the 15 guiding principles developed by Rall and Gaba, which were further refined by psychologist Peter Dieckmann. They are deliberately interwoven and may seem redundant at first glance, but in this way they form the most robust network possible against errors. Their key advantage: They can be accessed even under stress and can be practiced in day-to-day life.

The 15 CRM guiding principles are as follows:⁷

1. Know the environment.
2. Anticipate and plan.
3. Call for help early.
4. Exercise leadership and followership.
5. Distribute the workload.
6. Mobilize all available resources (people and technology).
7. Communicate effectively.
8. Use all available information.
9. Prevent and manage fixation errors.
10. Cross (double) check.
11. Use cognitive aids.
12. Re-evaluate repeatedly (10-for-10 principle).
13. Use good teamwork.
14. Allocate attention wisely.
15. Set priorities dynamically.

CRM communication in emergency medical services: tools and techniques

In emergency medical services, communication is an active safety tool. 

Closed-loop communication

One of the most effective techniques in CRM is what is known as closed-loop communication. The principle is simple: an order is placed, repeated verbatim by the recipient, and finally confirmed by the ordering party. Only then is the information considered to have been transmitted. 

Originally developed for military use and adapted for the medical field, this procedure eliminates one of the most common sources of error in practice: the unspoken assumption that an instruction has been received and understood.

In practice, this means: anyone who gives an order to the rescue team waits for a response. Anyone who receives an order actively confirms it. If there is no confirmation, it has not been received.⁸

Speak-Up and Team Timeout (10-for-10 principle)

In CRM, Speak-Up refers to the active encouragement to openly voice concerns, even to those higher up in the hierarchy. After all, not every communication gap stems from a lack of clarity – some arise from silence. This attitude is particularly crucial in emergency medical services, where the power imbalance between emergency physicians and EMS field providers is very real and palpable. Those who have doubts but remain silent leave it to chance whether the potential error will be noticed.

One way to create this space for the entire team is the 10-for-10 principle – 10 seconds for the next 10 minutes. In other words: the team takes a 10-second break so they can work in an organized manner for the next 10 minutes. This principle is one of the practical applications of the CRM concept, which holds that a small intervention can have a big impact. 

In practice, the Team Timeout is particularly valuable when the situation changes, when things are unclear, or whenever the team is in danger of breaking down into a series of individual actions.⁹

Structured handover using SBAR

One of the most error-prone points in emergency medical services is the handoff – the moment when the prehospital team transfers responsibility to the emergency department. Information is often lost in the process, priorities are miscommunicated, and the recipient does not have a complete picture. This is precisely where the (I)SBAR framework comes into play, which is recommended by both the WHO and the DGAI as a structured handover format.¹⁰

The optional “I” at the beginning stands for “Identification” – the introduction of the handing-off team by name.

SBAR stands for:

S – Situation: What exactly is the problem? Who is the patient, and what happened?

B – Background: What relevant pre-existing conditions, medications, or circumstances are known?

A – Assessment: How would you assess the current situation? What is your working diagnosis?

R – Recommendation: What do you recommend or anticipate as the next step?

The strength of the model lies in its universality: it works both when patients are transferred from the emergency medical services to the emergency department and for communication within the team or with the EDS. 

Consistent use of SBAR reduces the likelihood of errors at the points of handoff and, at the same time, lays the groundwork for prompt, targeted follow-up care for the patient.

CRM training in emergency medical services – from knowledge to action

Knowledge alone does not protect patients. CRM principles that are well-known but have never been applied under realistic conditions cannot be relied upon when it really counts. Under acute stress, the human brain relies on automatic behavioral patterns – only what has been practiced can then be recalled. CRM training therefore has a clear objective: to instill the right behavior so deeply that it remains effective even when the situation demands all available resources.

Simulation training as the key to success

CRM-based simulation training is considered the most effective method for optimizing teamwork and improving patient safety in emergency medical services. In a realistic training environment – featuring full-scale simulators, authentic patient histories, real-time vital signs, and the typical time pressure of an emergency response – teams are confronted with scenarios designed to deliberately provoke human-factor errors: unclear leadership responsibilities, a lack of feedback loops, and information gaps under stress.

The particular value of this training method lies in the fact that it allows for the safe and, in some cases, reproducible practice of real-world scenarios in patient care. This allows safety vulnerabilities to be identified and solutions to be developed collaboratively, in a psychologically safe environment where errors do not have real-world consequences for actual people.

The key learning element here is not only the simulation itself, but also the subsequent video-based debriefing: in a moderated debriefing, the team works together to analyze which communication and behavior patterns led to which outcomes. It is only through this structured self-reflection on one’s own actions that insights are firmly embedded and transformed into practical knowledge that can be applied in other situations.

Modern simulation training programs should comply with the minimum requirements set by the German Society for Simulation in Medicine (DGSiM) and be conducted by specially trained experts following a pedagogically sound, learning-objective-oriented approach.

CRM as a continuous process

CRM is a continuous development process. CRM can only be firmly established in emergency medical services if it is supported by regular field training, a culture of active reflection, and an institutional commitment to embedding safety as a core organizational value.

A significant part of this process ultimately takes place after the mission. CRM does not end when the patient is transferred to the hospital. To improve Situation Awareness over the long term, a structured Clinical Governance framework is required:

1. Post-mission debriefing: Formats such as the “hot debriefing” (immediately after the mission) or structured case studies enable the team to align their mental models. The point is not to assign blame (“Who made the mistake?”), but to understand the system (“Why did the decision make sense at that moment?”).¹¹
2. Psychological safety: Only when the team can be confident that critical feedback will not result in penalties will near-misses be reported. This information is invaluable for identifying systemic vulnerabilities before any real harm occurs.¹²
3. Standardization and feedback: Through regular, evidence-based feedback, CRM evolves from a “soft” topic into a key quality indicator for emergency medical services.

The data on this is clear. A randomized study conducted at the Simulation Center of Aix-Marseille University involving 198 intensive care nurses revealed significant differences following a five-day CRM training program and a six-month follow-up period:¹³

• Employee retention: In the training group, only 4% of employees resigned, compared to over 12% in the control group that did not receive CRM training. 
• Stress reduction: Perceived work stress (as measured by the Job Content Questionnaire) decreased significantly by 80.6% in the CRM group. 
• Cost-effectiveness: Given the costs associated with avoidable sick leave and employee turnover, training costs (approximately €500 per person) pay for themselves in no time.

WEINMANN – when device technology supports CRM principles

CRM only works if the team has the mental capacity to use it. Communication, team leadership, situational awareness – all of these require cognitive capacity. Capacity that is limited under stress. A ventilator that is intuitive to use, operates reliably, and actively reduces the workload on the team is therefore not merely a medical device – it is a key component of effective CRM in practice.

MEDUMAT Standard² and MEDUVENT Standard have been designed specifically with this concept in mind: ventilation is initiated in seconds based on the patient’s height or preset emergency modes. Vital ventilation parameters are transmitted to all team members via Bluetooth®, and audible and visual alerts help the entire team maintain Situational Awareness. During resuscitation, MEDUMAT Standard²’s CCSV mode automatically synchronizes ventilation with chest compressions – eliminating the need for manual coordination and creating space for team communication.

Integrating both devices into LIFE-BASE portable units standardizes workflows and minimizes sources of error. The wide range of ventilation modes – CPAP, BiLevel + ASB/BIPAP, PCV/aPCV, and NIV – enables flexible patient care without having to switch devices. 

After all, CRM is most effective when team culture, structured communication, and reliable technology work together. Learn how WEINMANN Emergency, with MEDUMAT Standard² and MEDUVENT Standard, can effectively lighten your team’s workload in the field – and thereby lay the groundwork for safe, professional emergency care. Learn more about our ventilators:

¹https://pubmed.ncbi.nlm.nih.gov/1524531/

²https://www.unimedizin-mainz.de/lernklinik/human-factors-sicherheit-in-der-medizin/human-factors.html

³https://aerztestellen.aerzteblatt.de/de/redaktion/kommunikationsprobleme-im-gesundheitswesen-ein-risiko-fuer-die-patientensicherheit

⁴https://link.springer.com/article/10.1007/s10049-012-1600-y

⁵link.springer.com/chapter/10.1007/978-3-662-48071-7_4

⁶reposit.haw-hamburg.de/bitstream/20.500.12738/6065/1/lsab13_33_BA_RE.pdf

⁷https://www.notsan-schule.brk.de/start/bildungsprogramm/simulationstraining/die-15-crm-leitsaetze-nach-rall-und-gaba.html

⁸med.libretexts.org/Bookshelves/Allied_Health/EMS_Psychomotor_Skills_Lab_Manual_(Hamper_Curtz_Edwins_and_Kennel)/03%3A_Team_Function/3.01%3A_Closed_Loop_Communications

⁹https://www.thieme-connect.com/products/ejournals/pdf/10.1055/a-0757-9089.pdf

¹⁰https://cdn.who.int/media/docs/default-source/integrated-health-services-%28ihs%29/csy/bec-slides/bec/sbar.pdf

¹¹https://www.research-collection.ethz.ch/entities/publication/a37a9c76-ff10-4685-b6e4-797a8d5fcb78

¹²link.springer.com/article/10.1007/s10049-025-01689-z

¹³www.skverlag.de/OJFM/VLB_EXPORT/leseprobe/9783964610461_Leseprobe.pdf