The foundation of effective prehospital care rests upon the ability of a clinician to rapidly gather accurate data and translate that information into a life-saving treatment plan. While physical examinations and vital signs provide a snapshot of a patient's current physiological state, the patient's history provides the context necessary to understand the "why" behind the clinical presentation. One of the most enduring and effective tools for this purpose is the SAMPLE history mnemonic.
Rather than serving as a rigid checklist, the SAMPLE assessment is designed as a conversational framework. When executed correctly, it transforms the clinician from a technician into an investigator, allowing for a deeper exploration of the patient's condition to identify both indications for treatment and critical contraindications.
The Framework of SAMPLE History
The SAMPLE mnemonic is a memory device used to ensure that no critical category of patient history is overlooked during the secondary assessment. It is applicable to any patient, regardless of the nature of their complaint, and serves as the primary mechanism for gathering the data required to formulate a field diagnosis.
The components of the SAMPLE mnemonic are broken down as follows:
| Component | Focus Area | Clinical Objective |
|---|---|---|
| Signs and Symptoms | Subjective and Objective Data | To identify what the patient feels and what the clinician observes. |
| Allergies | Hypersensitivities | To identify contraindications for specific medications or interventions. |
| Medications | Pharmacological History | To understand current treatments and potential drug interactions or toxicity. |
| Pertinent Medical History | Past Medical Conditions | To identify pre-existing illnesses that may contribute to the current crisis. |
| Last Ins and Outs | Intake and Output | To assess nutritional status, hydration, and gastrointestinal/genitourinary function. |
| Events | Sequence of Occurrences | To establish the mechanism of injury or the onset of illness. |
Strategic Integration into Patient Care
The application of SAMPLE history is not static; it must be prioritized based on the patient's stability. In the hierarchy of emergency medical care, treating immediate life threats always takes precedence over history taking.
If a patient presents with critical airway obstructions, respiratory failure, or circulatory collapse (such as cardiac arrest), the clinician must first stabilize these time-sensitive conditions. Chest compressions and airway management are performed before the SAMPLE process begins. Once the patient is stabilized or the primary survey is complete, the clinician transitions into the secondary assessment, where SAMPLE becomes the primary tool for refining the diagnosis.
Deconstructing Signs and Symptoms
A critical distinction in clinical assessment is the difference between a sign and a symptom. Understanding this dichotomy is essential for accurate reporting and diagnosis.
Signs: The Objective Evidence
Signs are objective findings that can be measured, seen, heard, or felt by the clinician. Examples include: - Heart rate and respiratory rate (measurable via vitals). - Auscultated wheezing in the lungs. - Visible bruising or lacerations. - Palpable edema.
Symptoms: The Subjective Experience
Symptoms are the patient's subjective descriptions of their condition. These are the "complaints" that cannot be measured by a device but are reported by the patient, such as: - Nausea or dizziness. - A feeling of "tightness" in the chest. - The specific quality of pain (aching, stabbing, or burning).
To avoid the "blank stare" that often follows a robotic question like "What are your signs and symptoms?", clinicians should engage the patient in a natural conversation. The goal is to probe the nature of the complaint and use the patient's answers to ask specific follow-up questions. For patients experiencing pain, the OPQRST mnemonic should be integrated into the SAMPLE process to delve deeper into the chief complaint and identify pertinent negatives.
Addressing Allergies and Medications
The "A" and "M" of SAMPLE are critical for patient safety. Failure to identify an allergy can lead to the administration of a contraindicated medication, potentially triggering anaphylaxis.
When assessing allergies, clinicians must avoid narrow questioning. Asking, "Are you allergic to any medications?" is too limiting. A patient may be allergic to foods, environmental factors, or latex—all of which could be relevant to their current condition. A broader approach ensures that all potential triggers are identified.
Similarly, the medication history provides insight into the patient's chronic conditions and may reveal the cause of the current emergency. For example, a patient taking certain blood thinners may be at a higher risk for internal bleeding following a traumatic event.
Exploring Pertinent Medical History
The medical history provides the background necessary to connect current symptoms to known pathologies. This section of the assessment should not be limited by the size of the data fields in an electronic patient care report (ePCR). A thorough clinician investigates the patient's history with the explicit goal of making a diagnosis or providing the necessary data for a definitive diagnosis by hospital staff.
By analyzing previous illnesses and injuries, the clinician can determine if the current event is a recurrence or a new complication. Follow-up questions regarding the outcomes of previous medical events are essential for gathering a complete clinical picture.
Analyzing Last Ins and Outs
The "L" in SAMPLE—Last Ins and Outs—is often the most neglected part of the assessment, yet it provides vital clues regarding the patient's metabolic and systemic state.
Assessing Intake (Ins)
Many providers limit their questioning to the last meal. An effective assessment casts a wider net by asking if the patient has been eating and drinking normally. If the patient indicates they have not, the clinician must determine: - What has prevented them from eating or drinking normally? - How long has this been occurring?
Assessing Output (Outs)
For patients complaining of abdominal or pelvic pain, "outs" (urination and bowel movements) are highly relevant. Clinicians should evaluate the following attributes of the output: - Frequency: How often is the patient voiding? - Color: Are there signs of hematuria or abnormal stool color? - Smell: Does the output indicate infection or specific metabolic changes? - Consistency: Is there diarrhea or constipation?
This segment of the history is also a strategic opportunity to screen for recreational or illegal drug use. With the prevalence of the opioid epidemic and the availability of synthetic cannabinoids (often sold as "bath salts"), drug intoxication is a frequent cause of behavioral complaints and altered levels of consciousness.
Reconstructing Events
The final component, "Events," allows the patient to provide a "frame-by-frame" description of the circumstances leading up to the illness or injury. This is particularly critical in trauma cases, where understanding the mechanism of injury (MOI) can reveal hidden risks.
For instance, if a patient suffered a fall and subsequent fracture, the "Events" portion of the history might reveal that alcohol consumption was a factor. This piece of information does more than explain the fall; it predicts potential respiratory depression and airway compromise, alerting the clinician to monitor the patient's breathing more closely.
Synthesizing SAMPLE for Treatment Decisions
The true value of the SAMPLE history is realized when it is synthesized with vital signs and physical exam findings. This holistic data set allows the clinician to make informed treatment decisions.
Identifying Indications and Contraindications
The data gathered via SAMPLE can confirm whether a specific intervention is indicated. Conversely, it can reveal contraindications. For example, if the SAMPLE history reveals a severe allergy to a specific drug, that intervention is immediately ruled out, preventing a secondary medical crisis.
Diagnosing Medical and Traumatic Conditions
SAMPLE can be the key to diagnosing the root cause of a medical emergency. A patient presenting with respiratory distress and swelling may be diagnosed with anaphylaxis once the "A" (Allergies) and "E" (Events) reveal the ingestion of a known allergen. In trauma, the "E" helps identify additional injuries that may not be immediately apparent during the physical exam but are likely given the mechanism of injury.
Conclusion
The SAMPLE mnemonic is far more than a checklist for documentation; it is a clinical tool for diagnostic reasoning. By treating the process as a conversation rather than an interrogation, the clinician can extract the nuanced details necessary to provide high-quality prehospital care. From identifying the subjective symptoms and objective signs to reconstructing the events leading to an injury, the systematic application of SAMPLE ensures that the clinician treats the patient as a whole, rather than just a set of symptoms.