Before We Start
Why does a trauma patient need a medical history before surgery?
When someone comes in as a trauma patient, the focus is understandably on the injury itself. But the surgical team needs to know critical background information before they can safely operate. A medication the patient is taking, an allergy they have, or a meal they ate three hours ago can all dramatically affect what happens in the operating room.
AMPLE is a rapid, systematic way to gather the five most critical pieces of information when time is short and the stakes are high. It's used in emergency departments, trauma bays, and pre-operative settings.
💡 The Memory Trick
AMPLE — think of an ample (generous, complete) medical history gathered in the shortest possible time.
Five letters. Five questions. Every trauma patient before every procedure.
The Five Components
AMPLE — what to ask and why it matters
A — Allergies
What is the patient allergic to — and what happens when they're exposed?
Not all allergies are equal. You need to know both WHAT they're allergic to and WHAT REACTION they have.
Critical categories:
• Medication allergies — especially penicillin, sulfa drugs, NSAIDs, opioids, anesthetics
• Latex allergy — extremely important in surgical settings where latex gloves and equipment are common
• Contrast dye allergy — relevant if imaging with contrast is needed
• Food allergies — some cross-react with medications (shellfish/iodine is a common exam question)
Reaction type matters: "I get a rash" is different from "My throat closes." A true anaphylactic reaction vs. a medication intolerance changes how the team manages the patient.
💊 Always ask: "Are you allergic to anything?" AND "What happens when you're exposed to it?"
M — Medications
What medications is the patient currently taking?
Current medications can significantly affect surgical risk and anesthetic management.
High-priority medications for trauma/surgery:
• Anticoagulants (warfarin, heparin, apixaban, rivaroxaban) — increase bleeding risk significantly. Surgery may be delayed or reversal agents given
• Antiplatelets (aspirin, clopidogrel) — affect platelet function, increase bleeding risk
• Insulin/antidiabetics — blood glucose management during and after surgery is critical
• Beta blockers — should generally be continued through surgery (abrupt stop can cause rebound hypertension or MI)
• Steroids — patients on long-term steroids need stress-dose steroids during surgery (adrenal suppression)
• Herbal supplements — many affect bleeding, anesthesia, or drug interactions (garlic, ginkgo, St. John's Wort)
💊 A patient on warfarin who needs emergency surgery = the surgeon and anesthesiologist need to know IMMEDIATELY. Time affects the reversal strategy.
P — Past Medical History
What conditions and surgeries does the patient have?
Past medical history provides context that shapes every decision the surgical team makes.
Key areas to assess:
• Chronic conditions — heart disease, diabetes, COPD, kidney disease, liver disease, clotting disorders
• Previous surgeries — scar tissue, known difficult airways, previous reactions to anesthesia
• Family history — malignant hyperthermia (a rare but potentially fatal reaction to certain anesthetic agents runs in families)
• Pregnancy status — must be established for any female of reproductive age before radiation or surgery
• Psychiatric history — relevant for pain management and post-operative delirium risk
💊 Always ask female patients of reproductive age: "Is there any chance you could be pregnant?" This is not optional.
L — Last Meal
When did the patient last eat or drink anything?
This is critical for anesthesia safety. When a patient is under general anesthesia, their protective airway reflexes (gag reflex, coughing) are suppressed. If they have food in their stomach, it can come up and be aspirated into the lungs — causing aspiration pneumonia or death.
NPO guidelines (nothing by mouth):
• Clear liquids: 2 hours before elective surgery
• Breast milk: 4 hours
• Light meal (toast, clear liquids): 6 hours
• Heavy meal, fatty food: 8 hours
In trauma: Surgery often cannot wait. The anesthesiologist must weigh the risk of aspiration against the urgency of the surgery. The nurse's job is to get the exact time and content of the last meal.
💊 "What did you last eat or drink, and what time was it?" — Get exact time AND what they consumed. "A few hours ago" is not specific enough.
E — Events Surrounding Injury
How did the injury happen? What was the mechanism?
The mechanism of injury predicts what injuries are likely to be present — even ones not yet found. This is called "index of suspicion."
High-energy mechanisms (expect serious injuries):
• High-speed MVC, ejection from vehicle, rollover
• Fall from >20 feet
• Penetrating trauma (gunshot, stabbing)
• Blast injuries
Key questions:
• What happened? (mechanism)
• Was there loss of consciousness? (suggests head injury)
• Was alcohol or drugs involved?
• Was it intentional? (safety concern — notify social work)
• Any events immediately before the injury? (Did they have chest pain before the car accident? Did they seize and then fall?)
💊 A patient who "fell" — ask: did they fall and hit their head, or did they lose consciousness FIRST and then fall? The answer changes the entire workup.
🏥 Clinical Scenario — Rapid AMPLE Before Emergency Surgery
Mrs. Okonkwo, 58 years old, was struck by a car while crossing the street. She has an open femur fracture and is being taken to the OR in 15 minutes. She is awake and alert. You have limited time.
A
Allergies: "Penicillin — I get hives and my throat gets tight." → Documented as penicillin allergy with anaphylactic reaction. Surgeon and anesthesiologist notified immediately. Alternative antibiotics ordered.
M
Medications: "I take warfarin for my heart, metformin for diabetes, and lisinopril for blood pressure." → Warfarin immediately flagged. INR drawn STAT. Anesthesiologist consulted regarding reversal. Metformin held (contrast and surgery risk). Blood glucose checked.
P
Past history: "I have atrial fibrillation, diabetes, and high blood pressure. I had my gallbladder out 10 years ago — no problems with anesthesia." → A-fib noted (relevant to warfarin use and cardiac monitoring). Previous anesthesia tolerance documented.
L
Last meal: "I had breakfast at 8:30 this morning — eggs and toast. And I had a cup of coffee about an hour ago." → It is now 11:45am. Last solid food 3 hours ago. Anesthesiologist notified — aspiration risk present. Rapid sequence intubation planned.
E
Events: "I was crossing the street and a car came out of nowhere. I didn't lose consciousness." → No LOC, mechanism is lower extremity impact. No pre-existing events (no chest pain, no dizziness before impact). Police report obtained.
📌 NCLEX Application
Most tested concept from AMPLE: The last meal question and aspiration risk. NCLEX loves to ask what the nurse should do when a patient who needs emergency surgery ate recently.
Answer: Report the time and content to the anesthesiologist — they make the risk/benefit decision, not the nurse. Your job is to gather and report accurate information.
Also frequently tested: A patient on anticoagulants needing surgery. The nurse's priority is to notify the surgeon and obtain coagulation studies (INR, PT/PTT) — reversal agents are a physician decision.
⚠️ The Trap — Skipping AMPLE When Time Is Short
When a patient is going to surgery in 10 minutes, it feels like there's no time for a history. This is when AMPLE is most important — not least important.
The five AMPLE questions take less than 2 minutes to ask. Skipping them can result in an unidentified allergy causing anaphylaxis on the table, a missed anticoagulant causing uncontrolled hemorrhage, or aspiration pneumonia from an unrecognized recent meal.
If the patient can't answer (unconscious, intubated), ask the family, check the medical record, check medication bottles brought from home, and contact the patient's pharmacy or primary care provider.