EMT · Primary Assessment · 6 min read · Open lesson
General Impression, Level of Consciousness and AVPU
- Form an immediate general impression to rapidly categorize patient stability and prioritize life-threatening conditions.
- Assess and categorize a patient's gross level of consciousness accurately using the AVPU mnemonic.
- Evaluate orientation across four standard components and recognize clinical signs of altered mental status.
Forming the Initial General Impression
The primary assessment begins the very instant you make visual contact with your patient. This rapid overview is known as forming the general impression. Before touching the patient or gathering vital signs, your initial visual observations establish critical baseline information. During these first few seconds, estimate the patient's age and assess their general appearance and apparent severity of illness or injury; do not assume biological sex from appearance. A key goal of this step is making a fundamental clinical determination: does the patient appear sick or not sick, stable or unstable? Determining the patient's chief complaint is an integral component of forming this general impression.
While approaching, you must also be ready to act on severe, immediate threats to life. Although airway management is traditionally considered an initial priority, any life-threatening external hemorrhage identified during your general impression must be controlled immediately before addressing the airway. In addition, when approaching an individual who appears motionless, silent, and cyanotic, you should approach with immediate preparation for cardiopulmonary resuscitation. If agonal gasps are observed, treat them as inadequate breathing, promptly assess for a pulse, begin CPR if the patient is pulseless, and assist ventilations if a pulse is present and breathing is inadequate.
Trauma considerations must also integrate seamlessly into these opening moments. If a spinal injury is suspected based on the mechanism or initial appearance, you must manually stabilize the head and neck when indicated. However, this manual stabilization must be executed without delaying the treatment of immediate life threats.
Visual Clues: Positioning, Perfusion, and Respiratory Warning Signs
A patient's spontaneous body positioning provides immediate visual clues regarding their respiratory status. For example, a patient leaning forward with hands braced on their knees in the tripod position is demonstrating an instinctive posture that signals respiratory distress. In pediatric patients, severe upper airway compromise often causes them to tilt their head back slightly and thrust the jaw forward into the sniffing position. Recognizing these postures can alert you to respiratory distress or possible upper-airway obstruction, but posture alone does not establish respiratory failure.
Evaluating skin color during the general impression offers early clues regarding systemic perfusion and oxygenation status. Pallor may result from poor perfusion, vasoconstriction, or anemia; cyanosis may result from inadequate oxygenation or reduced peripheral circulation. Either finding warrants further assessment. Flushing of the skin also provides an important early indicator of systemic changes. These visible skin clues help you immediately categorize whether the patient's cardiovascular and respiratory systems are functioning adequately.
Audible respiratory sounds and speech patterns also provide critical early findings. An alert patient who is speaking clearly in full sentences demonstrates a patent airway; however, this patent airway does not eliminate the need for a comprehensive assessment of their breathing and oxygenation. Conversely, abnormal sounds such as stridor or snoring respirations are major warning signs of upper airway obstruction. These sounds demand prompt airway assessment and appropriate EMT-level care to ensure passage of air.
Evaluating Level of Consciousness with the AVPU Scale
Evaluating a patient's level of consciousness reflects the functional status of their brain and central nervous system. Because a decrease in a patient's level of consciousness is often the earliest indicator of neurological deterioration or declining systemic perfusion, evaluating mental status must be performed rapidly during the primary assessment. The AVPU scale serves as a rapid tool used during the primary assessment to evaluate gross level of consciousness. While the Glasgow Coma Scale provides a more detailed numerical evaluation, AVPU gives the EMT an immediate, effective categorization of central nervous system function.
The AVPU mnemonic categorizes responsiveness into four distinct tiers: Alert, Responsive to Verbal stimuli, Responsive to Painful stimuli, and Unresponsive. An alert patient is awake and responds spontaneously to their surroundings, though it is important to realize that an alert patient may still be disoriented. A patient responsive to verbal stimuli opens their eyes or responds only when spoken to or shouted at. For instance, if a patient keeps their eyes closed until you speak to them, and then opens their eyes but cannot speak coherently, that patient is classified as V on the AVPU scale.
Any patient who responds only to verbal stimuli, responds only to painful stimuli, or is completely unresponsive is considered to have altered mental status. Altered mental status is formally defined as any deviation from a patient's normal baseline cognitive function. Common physiological causes that lead to altered mental status include hypoxia, hypoglycemia, and hypoperfusion.
| AVPU Category | Stimulus Required | Clinical Presentation and Airway Considerations |
|---|---|---|
| Alert (A) | None (spontaneous) | Awake and spontaneously responsive to the surroundings; may still be disoriented. |
| Verbal (V) | Spoken or shouted voice | Opens eyes or responds only when spoken to or shouted at; includes patients who open eyes but cannot speak coherently. |
| Painful (P) | Noxious physical stimulus | Does not respond to verbal cues; responds only to physical stimuli such as trapezius squeeze or nail-bed pressure. |
| Unresponsive (U) | No response to verbal or pain | Does not respond to any stimuli; high risk for airway obstruction by the tongue and loss of protective airway reflexes. |
Pain Assessment Techniques and Managing the Unresponsive Patient
If a patient does not respond to verbal cues, promptly assess breathing and pulse and address immediate life threats; assess response to a painful stimulus only when it will not delay indicated resuscitation. Always begin with verbal or light touch stimuli before applying noxious pressure. If verbal and light-touch stimuli produce no response, you should assess the response to pain using a brief trapezius squeeze or firm nail-bed pressure, according to local protocol. EMTs must completely avoid painful stimulation techniques that cause tissue damage, bruising, or lasting physical injury.
When evaluating the patient's response to pain, observe whether the reaction is purposeful, non-purposeful, or abnormal posturing. A purposeful response includes pushing away or localizing toward the painful stimulus. A non-purposeful response includes slight withdrawal or generalized muscle twitching without localizing the stimulus. In severe central nervous system impairment, you may observe posturing. Abnormal flexion posturing, also known as decorticate posturing, involves flexing the arms inward toward the chest in response to pain. Abnormal extension posturing, also known as decerebrate posturing, involves extending the arms rigidly at the sides in response to pain. Decerebrate posturing generally indicates more severe central nervous system dysfunction than decorticate posturing.
A patient who does not respond to either verbal or painful stimuli is classified as unresponsive. An unresponsive patient faces a high risk of airway obstruction by the tongue and may have impaired protective airway reflexes. When indicated, an EMT-level airway adjunct may be needed to maintain airway patency. For an unresponsive medical patient who is breathing adequately and has no suspected trauma, place the individual in the recovery position to help maintain a clear airway.
Orientation Testing and Monitoring Mental Status Trends
When a patient is determined to be alert on the AVPU scale, you must further evaluate their orientation to determine their cognitive baseline. Orientation is assessed across four standard components: person, place, time, and event. Orientation to person tests whether the patient knows their own name. Orientation to place tests whether the patient knows their current physical location. Orientation to time tests whether the patient knows the current year, month, or day. Orientation to event tests whether the patient understands the circumstances surrounding the emergency.
A patient who successfully and accurately answers all four inquiries is documented as Alert and Oriented times four. Incorrect orientation answers can indicate impaired mental status in an alert patient, but first consider communication barriers and determine whether the finding differs from the patient's usual baseline. A patient who is alert but believes the current year is decades in the past is disoriented; ask caregivers or review available history to determine whether this differs from their cognitive baseline.
When assessing elderly patients or those with known cognitive impairment, you should verify their baseline mental status with family members or caregivers. This ensures that you do not confuse a chronic baseline deficit with an acute change caused by hypoxia, hypoglycemia, or hypoperfusion. Throughout your care, you must conduct serial reassessment of the level of consciousness. Serial reassessments allow you to track improving or worsening clinical trends over time, providing critical insight into whether systemic perfusion and neurological function are stabilizing or declining.
Common mistakes
- Prioritizing airway interventions over life-threatening external hemorrhage identified during the general impression.
- Assuming that an alert patient has normal cognitive function without formally testing orientation to person, place, time, and event.
- Using painful stimulation techniques that cause bruising or tissue damage rather than safe methods like a trapezius squeeze or nail-bed pressure.
- Failing to conduct serial reassessment of the level of consciousness to detect early signs of neurological or systemic decline.
Summary
- The general impression begins at first visual contact: estimate age, assess appearance and apparent severity, identify immediate threats, and determine the chief complaint as information becomes available.
- Control life-threatening external hemorrhage promptly; if agonal gasps are present, assess for a pulse, start CPR if pulseless, and assist ventilations if a pulse is present and breathing is inadequate.
- Body positioning (such as tripod or sniffing) and skin color changes provide rapid visual clues regarding respiratory distress and perfusion status.
- The AVPU scale provides a gross assessment of consciousness, categorizing patients as Alert, Verbal, Painful, or Unresponsive.
- Unresponsive patients are at high risk of airway obstruction by the tongue, may lack protective reflexes, and may require an EMT-level airway adjunct or the recovery position if breathing adequately without trauma.
- Responses to painful stimuli range from purposeful localization to abnormal posturing, with decerebrate extension indicating more severe central nervous system dysfunction than decorticate flexion.
- Assess alert patients' orientation to person, place, time, and event; an unexpected deficit may indicate altered mental status after communication barriers and the patient's baseline are considered.
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