Chapter 20 Clinical Decision Making Textbook
Objectives and Competencies
Decision Making in the EMS context involves:
Performing interventions as part of a treatment plan to relieve symptoms and improve overall patient health.
Evaluating the effectiveness of interventions and modifying the treatment plan accordingly.
Evaluating decision‑making strategies for cognitive errors to enhance future critical thinking (metacognition).
Chapter objectives for the paramedic student:
1. Discuss how assessment-based management contributes to effective patient and scene assessment. (p 678)
2. List the key elements of paramedic practice. (pp 680–681)
3. Describe factors that affect assessment and decision making in the prehospital setting. (pp 680–682)
4. Outline effective techniques for scene and patient assessment and choreography. (p 682)
5. Identify essential take‑in equipment for general and selected patient situations. (pp 684–685)
6. Outline strategies for a patient approach that promotes an effective patient encounter. (pp 685–686)
7. Discuss the limitations of protocols, standing orders, and patient care algorithms. (p 686)
8. Outline the key components of the critical‑thinking process for paramedics. (pp 687–690)
9. Identify elements necessary for an effective critical‑thinking process. (pp 687–688)
Describe situations that may necessitate the use of the critical‑thinking process while delivering prehospital patient care. (pp 688–690)
Describe the six elements required for effective clinical decision making in the prehospital setting. (pp 687–688)
Describe techniques to permit efficient and accurate patient handoffs. (pp 691–692)
Key terms (definitions included as quick reference):
action plan: A plan of action based on the patient’s condition and the environment.
application of principles: A component of critical thinking where decisions are based on a conceptual understanding and interpretation of data.
assessment-based management: Comprehensive care based on patient assessment, history, and examination.
clinical decision making: The decision or choice the paramedic makes at the end of the clinical reasoning process.
clinical judgment: The overall process of clinical reasoning and clinical decision making.
clinical reasoning: The thought process the paramedic uses to evaluate problems.
concept formation: All elements gathered to form a general impression of the patient.
contemplative approach: History and exam before care delivery.
critical thinking: The ability to quickly focus thinking to achieve the desired results given the situation.
data interpretation: Gathering data to form a field impression and working diagnosis.
differential diagnosis: A list of suspected diseases/injuries causing a patient’s signs/symptoms.
evaluation: Assessing the patient’s response to care.
field impression: An impression of the patient’s condition based on pattern recognition from experience.
metacognition: Awareness and understanding of one’s own thought processes.
multitasking: Asking questions, taking notes, and performing tasks while listening.
patient handoff: Effective communication and transfer of patient information during handoffs.
patient management plan: A plan of care based on patient assessment findings.
pattern recognition: Comparing gathered information with knowledge base to form recognizing patterns.
reflection on action: Post‑event evaluation for improvement in future responses.
resuscitative approach: Immediate intervention for life‑threatening illness/injury.
tunnel vision: Narrow focus on a single priority to the exclusion of other factors.
EMS environment: Unique uncertainty requiring paramedics to develop and apply a patient management plan by gathering, evaluating, and synthesizing information; formulating a field impression from pathophysiology and physical findings; and implementing treatment while applying judgment under pressure.
Foundational concepts: leadership, communication, and metacognition are cornerstones of EMS care.
Core Concepts: Assessment‑Based Management and the Field Impression
Assessment‑based management:
Comprehensive care grounded in patient history, physical exam, and history‑guided data.
The paramedic’s disease knowledge supports a high suspicion differential diagnosis.
The differential diagnosis focuses history toward the complaint and directs the physical exam toward relevant body systems.
Some field situations impair assessment (unsafe scenes, entrapment); nonetheless, history and exam remain essential.
Field impression and action plan:
Field impression is the most likely cause of illness/injury based on cues, history, and exam.
The action plan follows the field impression and may include ECG monitoring, pulse oximetry, IV therapy, aspirin, nitroglycerin, etc., depending on the case.
On‑scene decision making relies on pathophysiology knowledge and clinical judgement guided by environmental cues and EMS leadership/communication.
Clinical judgment process (overview):
Dispatch information initiates a process that evolves en route and on scene where additional data refine the differential diagnoses.
Pattern recognition validates a field impression by matching patient presentations to known patterns (e.g., chest pain patterns suggesting acute myocardial infarction).
Correct pattern matching improves treatment initiation; mismatches require reevaluation.
Pattern recognition examples:
55‑year‑old with chest pain and SOB: likely MI pattern, leading to ECG monitoring, IV access, aspirin, etc.
20‑year‑old with chest pain: different expected patterns than MI; plan may focus on ruling out respiratory infection, pneumothorax, etc.
On‑scene decision dynamics:
Dispatch → En route → Scene: refine differential diagnoses with history, exam, and pattern matching.
The greater the paramedic knowledge base and assessment quality, the higher the probability of appropriate field impression and effective treatment.
Critical Thinking, Judgment, and Cognitive Constructs
Critical thinking in paramedic practice involves:
Clarifying goals, examining assumptions, uncovering hidden values, evaluating evidence, and assessing conclusions.
Creativity, reflection, and analytic thinking, beyond rote memorization.
Interrelated concepts:
Clinical reasoning: thought process used to evaluate problems.
Clinical decision making: final decision after reasoning.
Clinical judgment: overall synthesis of reasoning and decision making.
Gut instinct and metacognition:
Do not ignore gut instinct; it can reveal subtle cues that are hard to quantify.
Metacognition: awareness of one’s own thought processes; improving metacognition improves care.
Evidence from practice:
Studies show experienced paramedics perform more assessments, consider more differentials, and initiate advanced care more effectively, linking experience and inferential reasoning to better outcomes.
Strategies to reduce decision errors prehospital:
Consciously think about your thinking (metacognition).
Recognize high‑risk situations and apply extra caution.
Identify and manage biases; do not prematurely attribute signs to intoxication or other bias sources.
Cognitive errors and bias (examples):
Bias can cause overlooking important data; tunnel vision narrows consideration to a single cause.
Do not rely solely on protocols:
Protocols, standing orders, and algorithms promote standardization but have limitations: may not fit nonspecific complaints, may not cover multiple etiologies, and may encourage linear thinking.
Critical thinking prompts and checklists:
The Six Rs framework (below) and other structured approaches help organize thinking under pressure.
Factors That Affect Assessment and Decision Making
Influencing domains (broad):
Paramedic factors: personal attributes (gender, race, culture), knowledge, skills, and abilities.
Patient factors: cooperation, communication ability, and willingness to participate in history/exam.
Environmental factors: scene safety, chaos, weather, noise, bystanders, other responders.
Leadership and communication on scene are essential pillars regardless of clinical framework.
The role of judgment in protocols:
Judgement includes knowing when to apply, modify, or deviate from protocols when patient safety demands it (e.g., nitroglycerin with sildenafil within 18 hours, where PDE5 inhibitors raise risk of hypotension).
Bias and labeling dangers:
Judgmental attitudes or bias (conscious or unconscious) can impede data gathering and create disparities.
Examples include assuming an indigent patient is intoxicated or labeling a patient as a “frequent flyer,” which can limit evaluation.
Environmental and patient cooperation factors:
Distractions, non‑cooperation, language barriers, cultural factors can impede assessment.
Evaluating uncooperative or agitated patients for underlying trauma or illness is essential.
Obvious but non–life‑threatening distractions:
Minor injuries (e.g., open fractures, facial injuries) may divert attention from life‑threats; management may require covering wounds to focus on more serious problems.
Bias, Tunnel Vision, and Patient Factors; Environmental Context
Bias, labeling, and tunnel vision can cause omission of the big picture and lead to rushed, inappropriate plans.
Patient factors affecting cooperation include trust in the crew, language barriers, cultural differences, and other barriers.
Environmental cues matter:
Temperature extremes, presence of drug paraphernalia, scene chaos, violence, weather, and noise can inform the patient’s condition and complicate assessment.
Strategies to maintain safety and focus on the patient:
After ensuring personal safety, attempt to control the environment (e.g., involve law enforcement if needed).
The Crew, CRM, and Team-Based Performance in EMS
Crew Resource Management (CRM):
Aims to reduce errors and adverse events by focusing on communication, teamwork, situational awareness, workload management, and decision making.
Originated in aviation (1979) and adapted to healthcare and public safety.
Core philosophy: patient care is a shared responsibility; all crew members contribute to safety and quality of care.
Crew considerations and team composition:
Crews can vary: single paramedic with EMT, two paramedics, or multiple responders (EMS, fire/rescue, police).
Clear roles and duties reduce confusion; tasks can be distributed or performed in parallel.
Assessment and management choreography:
On multi‑responder scenes, preplanned roles help maintain order; roles can be assigned by shift, crew, or rotated as needed.
Common two‑paramedic plan: one as team leader, one as patient care lead; others handle extrication, equipment, or liaison with medical direction.
PACE model for challenging scenes:
Probe: Ask for clarification with specific questions directed to a single person.
Alert: Notify the leader of concerns or abnormal findings to adjust course.
Challenge: Direct challenge if alert fails; must be specific and structured (name, threat, rationale, potential consequences, mitigation).
CRM Circle of Success (LeSage, Dyar, Evans):
Stages: Inquiry → Advocacy → Emergency → Conflict resolution → Decision → Observe/Options → Return to previous stages as needed.
Purpose: to resolve concerns about decisions while maintaining safety.
CRM leadership principles:
The team leader sets mission/objectives, delegates tasks, maintains situational awareness, and ensures safety.
All team members acknowledge their assigned roles and report completion of tasks.
Open, honest communication is essential; empowerment to raise concerns early improves outcomes.
The Right Stuff: equipment readiness for worst‑case scenarios
Essential items for all patient care: a boxed list including PPE, airway adjuncts, breathing equipment, circulation supplies, disability/dysrhythmia tools, and exposure gear.
Box 20‑1 (Essential Items for All Aspects of Patient Care) covers:
Personal Protection: safety glasses, gloves, gowns, masks
Airway: nasal/oral airways, suction equipment, supraglottic airway, intubation equipment
Breathing: large‑bore thoracic decompression catheter, BVM, occlusive dressings, oxygen delivery and monitoring devices (pulse oximetry and end‑tidal CO2), oxygen tank/regulator
Circulation: dressings, bandages, BP cuff, stethoscope, tourniquets, vascular access supplies and fluids
Disability and Dysrhythmia: cardiac monitor/defibrillator, flashlight, rigid cervical collar
Exposure: scissors, blanket, etc.
Take‑in equipment versus specialty equipment:
In addition to essential kit, agencies may carry pediatric bags, mass‑ casualty kits, and electronic documentation devices.
The CRM framework emphasizes preplanning, role clarity, situational awareness, and continuous assessment of plan effectiveness.
The Critical‑Thinking Process and the Six Rs
The Six Rs framework for EMS critical thinking (Figure 20‑4) summarizes the decision‑making loop:
1) Read the patient – thorough history and physical exam within the situation's context.
2) Read the scene – assess environmental conditions for mechanism of injury or clues of illness.
3) React – manage life threats first and identify the most likely cause consistent with the presentation.
4) Reevaluate – focused, detailed reassessment of patient response to treatment.
5) Revise the management plan – modify the plan based on reevaluation findings.
6) Review performance through a run critique – post‑call reflection to improve future responses.Concept formation (the “what” of the patient story):
Scene size‑up, chief complaint, patient history, affect, initial assessment, diagnostic tests.
Data interpretation (the “working phase”):
Seeks a complete picture using anatomy, physiology, pathophysiology knowledge, intuition, and experience; condenses and communicates data to the online physician when needed.
Application of principles and evaluation:
Apply principles based on conceptual understanding and data interpretation to form a working diagnosis and treatment plan (often via protocols/standing orders with physician direction as needed).
Evaluation and reflection on action:
Ongoing reassessment, determining effectiveness, revising field impression, evaluating protocol appropriateness, and revising treatment as needed.
The Six Rs are complemented by mnemonics and tools to support decision making in real time:
I‑PASS BATON and MIST mnemonics for handoffs and information structuring.
Additional notes on decision making under pressure:
The fight‑or‑flight response can affect decision making positively (focus and speed) or negatively (reduced concentration), so mental conditioning and structured checklists are recommended.
The critical‑thinking process requires adequate knowledge and the ability to handle ambiguity, organize data, and construct and defend arguments.
Decision Making Under Pressure: Strategies and Tools
Decision‑making in prehospital care involves intuitive (System 1) and analytic (System 2) processes:
System 1 (fast, pattern‑based) helps in familiar situations but risks errors if used alone.
System 2 (slower, analytic) reduces error but can be stressed by cognitive load, fatigue, or emotional stress.
A balance of systems reduces error probability and improves efficiency.
When to rely on intuition versus analysis:
Intuition is valuable for rapid assessment when patterns are clear and experience supports the pattern.
In undifferentiated or high‑risk situations, analytic checks (three differential diagnoses, thorough history/exam, and reflection) help prevent misdiagnosis.
Critical thinking in practice: a scenario‑driven, iterative process that integrates data interpretation with action planning, reassessment, and handoff.
Three practical strategies to reduce error risk in decision making:
Consider at least three differential diagnoses.
Rule out confounding factors that impede communication (hypoglycemia, stroke, etc.).
Reflect on data collection and decisions; seek input from medical direction as needed.
Clinical Decision Rules, Risk, and Undifferentiated Patients
Clinical decision rules and risk assessment:
An increasing emphasis on evidence‑based rules and early warning scores to quantify risk (e.g., probability that a patient has a particular adverse event).
Cervical spine injury screening (NEXUS criteria):
NEXUS criteria have a sensitivity of about 0.99 for cervical spine injury and nearly 1.00 for clinically significant injury, but specificity is limited (many positives do not have significant injury).
Criteria include absence of spinal tenderness, normal alertness, no distracting injuries, no intoxication, and no focal neurologic changes.
These criteria are used to rule out injury in blunt trauma and guide decision making; applicability should be evaluated for each EMS system.
Decision processing models:
Intuitive (System 1) vs. analytic (System 2) thinking and the need for a healthy balance to reduce cognitive error.
Experience increases reliance on pattern recognition, but clinicians must remain vigilant for life‑threatening conditions that do not present with classic patterns.
Application to prehospital care:
On any call, paramedics must navigate obvious life threats, potential life threats, and non‑life‑threatening problems using protocols but with clinical judgment to adapt when necessary.
Training implications:
Evidence from EMS safety initiatives supports the idea that clinicians should be empowered to use judgment and adapt protocols when patient safety requires it.
The Critical‑Thinking Process: Steps and Examples
The critical‑thinking process for paramedics comprises five core phases (with subskills):
Concept formation: collect cues from scene size‑up, chief complaint, patient history, affect, initial exam, and tests.
Data interpretation: form a working diagnosis using anatomical/pathophysiological knowledge, intuition, and experience.
Application of principle: implement treatment guided by the field impression and working diagnosis, using protocols and direct orders when necessary.
Evaluation: reassess patient response, reflect on action, and determine if the field impression or treatment needs revision.
Reflection on action: after action review to improve future responses and data interpretation skills.
The Six Rs in practice (reiterated):
Read the patient; Read the scene; React to life threats; Reevaluate; Revise the management plan; Review performance via run critique.
Practical notes on data interpretation and concept formation:
Concept formation integrates scene cues, chief complaint, history, affect, exam, and tests to form the patient’s general impression.
Data interpretation depends on anatomy, physiology, and pathophysiology knowledge, plus prior experience and the ability to communicate with online physicians when needed.
Scenarios to illustrate critical thinking (scenarios are summarized, not verbatim):
Part 1: Fire‑site funeral home case with difficulty breathing; a past pneumothorax example demonstrates comparing current interpretation with prior data and refining field impression.
Part 2: Prior patient with chest symptoms; the clinician distinguishes between MI pattern vs other etiologies (pneumothorax, pneumonia). Emphasizes dynamic data interpretation and differential adjustments as new information arises.
Part 3: Two different chest‑pain presentations illustrate evolving working diagnosis (pulmonary embolism vs pulmonary hypertension vs sickle cell crisis with anemia).
Part 4: Handling undifferentiated patients with a methodical approach to rule in/out life threats first and proceed with thorough history/exam.
Part 5: Reflective learning with a student to reinforce learning, highlight the importance of broad differential and pattern recognition.
Handling undifferentiated patients:
History provides most clues; physical exam is often less determinative; tests may be limited.
Use a systematic approach to rule out life threats first, then pursue likely etiologies; maximize patient orientation and collaboration to gather accurate information.
Use prehospital diagnostic tests appropriately to guide care.
Handoff and Communication: Ensuring Safe Transitions
The patient handoff (handover) is a critical transfer of care and a potential source of medical error if done poorly.
Handoff modalities include: face‑to‑face, telephone/radio reports, or written reports.
Effective handoffs share several characteristics:
Concise (often under 1 minute)
Free of excessive medical jargon
Follows a consistent information pattern
High‑yield with pertinent findings and negatives
Communicated respectfully
Hospital handoffs should ideally occur with the patient at the bedside to maintain focus on the report.
Mnemonics and structure to improve handoffs:
I PASS (the BATON): Introduction, Patient, Assessment, Situation, Safety concerns, Background, Actions, Timing, Ownership, Next steps
MIST: Mechanism, Injuries/Injuries observed, Vital signs, Treatment
CHARTE format (Chief complaint, History, Assessment, Rx/Treatment, Transport, Environment)
Evidence on handoffs:
Video studies show variable reporting of exam findings, history, age, weight, vitals, and oxygenation; interruptions are common; handoffs are often incomplete or inefficient.
Practical implication:
When possible, provide formal, structured, and concise handoffs to improve patient safety and continuity of care.
Practical Take‑Home Points and Summary
Paramedics must develop and implement appropriate patient treatment plans in challenging environments by gathering, evaluating, and synthesizing information; applying judgment and independent decision making; and working under pressure.
Multiple factors influence assessment and decision making:
Paramedic factors (attitudes, critical thinking, bias management)
Patient factors (cooperation, communication ability)
Environmental factors (scene safety, crowding, weather)
Team and leadership dynamics (CRM, preplanned roles)
Promote a coherent assessment through preplanning of roles; always be prepared for the worst case with essential equipment (Right Stuff).
The general approach to patients should be calm, professional, and confidence‑building; establish trust early to improve cooperation.
On the front end, two primary approaches to the initial assessment shape the encounter:
Resuscitative approach: immediate action for life‑threats, including conditions such as cardiac arrest, major trauma, respiratory distress, seizures, shock, and stroke.
Contemplative approach: gather history and perform a physical exam before initiating interventions when life threats are not immediately evident.
Decision making in EMS relies on a balance of System 1 (intuitive) and System 2 (analytic) thinking; both are necessary to reduce errors and optimize care.
Clinical decision rules and risk assessment tools help quantify risk but should be evaluated for applicability to the local patient population before adoption.
The Six Rs provide a structured framework for critical thinking in EMS calls: Read the patient, Read the scene, React to threats, Reevaluate, Revise, Review performance.
The Six Rs are supported by additional tools (mnemonics such as I‑PASS BATON and MIST) to improve handoff quality and overall patient safety.
Reflection on action (after‑action review) supports continuous improvement and enhances metacognitive awareness among EMS professionals.
Key References and Suggested Readings (selected concepts mentioned in the text)
Critical thinking and clinical judgment frameworks for EMS:
Concept formation, data interpretation, application of principles, evaluation, reflection on action (Figure 20‑3).
The Six Rs (Figure 20‑4).
Crux of CRM: leadership, communication, and shared responsibility for patient care.
Practical guides and mnemonics for handoffs:
I PASS BATON; MIST; CHARTE formats.
Decision rules and safety tools:
NEXUS criteria for cervical spine injury screening (high sensitivity, limited specificity).
Evidence and ethics in EMS decision making:
Studies on experienced vs less experienced paramedics and cognitive task analysis.
Ethical considerations around decision making and the need for flexible protocols that allow clinical judgment.
Appendix: Important Numerical/LaTeX References
NEXUS cervical spine injury sensitivity: (high sensitivity); specificity is not as high, meaning some non‑significant injuries will be flagged by the criteria.
General risk assessment frameworks and probabilities can be expressed as: , with decision rules providing thresholds to guide action.
The metacognition and evidence references emphasize a quantitative/qualitative mix; the exact numeric values (e.g., percentages) are provided in the text for sensitivity and related measures where noted.
Final Notes
The material emphasizes: assessment‑based care, the limitations of rigid protocols, the critical importance of safe, structured handoffs, CRM and teamwork, and a robust critical‑thinking process (Six Rs) to guide prehospital decision making under pressure.
Practitioners should continually balance intuitive pattern recognition with analytic checks, remain aware of biases, and use structured communication tools to maximize patient safety and quality of care.