NCLEX Review Guide: Triage System in Emergency Care

Definition and Purpose

• Triage is a systematic process of sorting patients based on the severity of their condition and the likelihood of survival with medical intervention. The primary goal is to identify patients requiring immediate attention and allocate resources effectively during situations where needs exceed available resources.
• Triage systems optimize patient flow in emergency departments by ensuring that patients with life-threatening conditions receive priority care while those with less urgent needs wait appropriately.

Triage Nurse Responsibilities

• Triage nurses must possess excellent clinical assessment skills and critical thinking abilities to rapidly evaluate patients and assign appropriate acuity levels. They serve as the first clinical contact for patients entering the emergency department.
• Key responsibilities include performing rapid assessments, documenting findings, initiating emergency protocols, reassessing waiting patients, and communicating effectively with the healthcare team.

Emergency Severity Index (ESI)

• The Emergency Severity Index is a five-level triage algorithm that categorizes patients by both acuity and resource needs. ESI Level 1 represents patients requiring immediate life-saving intervention, while ESI Level 5 represents patients with minor complaints requiring minimal resources.
• The ESI system uses a decision tree approach where the triage nurse first assesses if the patient is dying (Level 1) or at high risk (Level 2), then estimates resource needs for remaining patients (Levels 3-5).

Canadian Triage and Acuity Scale (CTAS)

• CTAS is a five-level triage system developed in Canada that assigns patients to categories based on presenting complaints, physiological parameters, and potential risk. Level I represents resuscitation (immediate threat to life), while Level V represents non-urgent conditions.
• CTAS includes specific time targets for physician assessment: Level I (immediate), Level II (≤15 minutes), Level III (≤30 minutes), Level IV (≤60 minutes), and Level V (≤120 minutes).

Manchester Triage System (MTS)

• The Manchester Triage System uses 52 flowcharts based on presenting complaints to assign patients to one of five priority levels. Each level is color-coded: Red (immediate), Orange (very urgent, 10 min), Yellow (urgent, 60 min), Green (standard, 120 min), and Blue (non-urgent, 240 min).
• MTS uses discriminators (key features) within each flowchart to help the triage nurse determine the appropriate priority level, focusing on clinical presentation rather than diagnosis.

Australasian Triage Scale (ATS)

• The Australasian Triage Scale is a five-tier triage system used in Australia and New Zealand that categorizes patients from Category 1 (immediately life-threatening) to Category 5 (non-urgent). Each category has a defined maximum waiting time for treatment.
• ATS incorporates performance indicators for emergency departments, with compliance standards for the percentage of patients who should be seen within the specified timeframes for each category.

Primary Assessment

• The primary assessment follows the ABCDE approach: Airway, Breathing, Circulation, Disability, and Exposure. This systematic approach helps identify immediate life-threatening conditions requiring urgent intervention.
• Critical physiological parameters evaluated include airway patency, respiratory rate and effort, pulse quality and rate, blood pressure, capillary refill, level of consciousness, and pupillary response.

1. Assess airway patency and apply interventions if compromised
2. Evaluate breathing quality, rate, and effort
3. Check circulation: pulse quality, blood pressure, capillary refill
4. Assess disability: AVPU scale or Glasgow Coma Scale
5. Expose patient as needed to identify other injuries or conditions

Vital Signs Interpretation

• Vital signs provide objective data for triage decisions and must be interpreted within the context of the patient's age, presenting complaint, and baseline status. Significant deviations from normal ranges may indicate higher acuity.
• Key vital sign parameters include heart rate, respiratory rate, blood pressure, temperature, oxygen saturation, and pain score. The shock index (heart rate divided by systolic blood pressure) can help identify early shock when >0.9.

Pain Assessment

• Pain assessment in triage includes evaluation of intensity, quality, location, radiation, duration, and exacerbating/relieving factors. Pain is considered the "fifth vital sign" and significantly influences triage decisions.
• Standardized pain scales used in triage include the Numeric Rating Scale (0-10), Visual Analog Scale, Wong-Baker FACES Scale for children, and behavioral pain scales for non-verbal patients.

Pediatric Triage

• Pediatric triage requires age-specific assessment techniques and recognition of unique physiological parameters. Children often present with different manifestations of critical illness compared to adults.
• Key considerations include age-appropriate vital sign ranges, the Pediatric Assessment Triangle (appearance, work of breathing, circulation), and developmental stage assessment. The Pediatric Early Warning Score (PEWS) may be incorporated to identify deteriorating children.

Geriatric Triage

• Geriatric patients require special consideration during triage due to atypical presentations of serious conditions, multiple comorbidities, polypharmacy, and altered physiological responses. Subtle changes in mental status may be the only indication of serious illness.
• Key considerations include baseline functional status, cognitive assessment, fall risk, medication review, and social support evaluation. The Identification of Seniors At Risk (ISAR) tool can help identify elderly patients at higher risk for adverse outcomes.

Mental Health Triage

• Mental health triage requires assessment of both psychological and safety risks. Key components include suicide risk assessment, homicidal ideation, psychosis evaluation, substance use screening, and assessment of ability to care for self.
• Specialized tools like the SAD PERSONS Scale for suicide risk or the Mental Health Triage Scale may be used to standardize assessment and determine appropriate acuity levels.

Mass Casualty Triage

• Mass casualty triage differs from daily ED triage, focusing on doing the greatest good for the greatest number rather than providing optimal care to each individual. The goal shifts to identifying salvageable patients who need immediate intervention.
• Common systems include START (Simple Triage and Rapid Treatment), JumpSTART (pediatric adaptation), SALT (Sort, Assess, Lifesaving interventions, Treatment/Transport), and MASS (Move, Assess, Sort, Send).

Common Triage Pitfalls

• Undertriage occurs when a patient is assigned a lower acuity level than appropriate, potentially delaying necessary care. This often happens with patients who have subtle presentations of serious conditions or who appear deceptively stable.
• Overtriage occurs when a patient is assigned a higher acuity level than needed, potentially diverting resources from more critical patients. Both undertriage and overtriage can negatively impact ED operations and patient outcomes.

ESI Level Memory Aid

Red Flag Symptoms

CTAS Memory Aid

Quick Check Questions

Common Pitfalls Warnings

Knowledge Checkpoints

• I can explain the purpose and principles of triage systems
• I can describe the key features of ESI, CTAS, MTS, and ATS triage systems
• I understand the ABCDE approach to primary assessment
• I can interpret vital signs appropriately for different age groups
• I understand the special considerations for pediatric, geriatric, and mental health triage
• I can differentiate between daily triage and mass casualty triage principles
• I can identify red flags that warrant immediate intervention
• I understand the concept of undertriage and overtriage
• I can apply appropriate triage categories to clinical scenarios
• I recognize the importance of reassessment in the triage process