# Situation: A 30-year-old man weighing 70 kg is brought to the emergency department after a motorcycle crash at 13:10. He is talking in full sentences. Bright red blood spurts from a deep wound of the left thigh despite a pressure dressing applied in the field. He has no head injury and no known drug allergies. The physician orders tranexamic acid 1 g intravenously (IV) over 10 minutes, followed by 1 g over 8 hours. The drug arrives from the pharmacy at 15:55. What should the nurse do?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=630136  
> language: ko  
> subject: Nursing Practice V — Care of Clients with Maladaptive Patterns of Behavior; Care of Clients with Life-Threatening Conditions, Acute Multi-Organ Problems, High Acuity and Emergency Situations

## 문제

Situation: A 30-year-old man weighing 70 kg is brought to the emergency department after a motorcycle crash at 13:10. He is talking in full sentences. Bright red blood spurts from a deep wound of the left thigh despite a pressure dressing applied in the field. He has no head injury and no known drug allergies.

The physician orders tranexamic acid 1 g intravenously (IV) over 10 minutes, followed by 1 g over 8 hours. The drug arrives from the pharmacy at 15:55. What should the nurse do?

## 보기

1. Push the loading dose over 1 minute to save time
2. Start only the 8-hour infusion, without the loading dose
3. Hold it, as benefit ends 2 hours after injury
4. Start the 10-minute loading dose now **✔ 정답**

**정답: 4**

## 해설

Tranexamic acid is given within 3 hours of injury in significant bleeding: 1 g IV over 10 minutes, then 1 g over 8 hours. At 15:55 he is 2 hours 45 minutes from injury, so the loading dose should start at once; after 3 hours it is avoided.

## 심화 해설

Clinical context

A 30-year-old man with major hemorrhage from a left thigh wound arrives at 13:10. The physician orders tranexamic acid (TXA) 1 g IV over 10 minutes, then 1 g over 8 hours. The drug arrives at 15:55, which is 2 hours 45 minutes after injury. The correct action is to start the 10-minute loading dose immediately.

Why the 3-hour window matters

TXA is an antifibrinolytic agent. It works by blocking the conversion of plasminogen to plasmin, thereby stabilizing clots that have already formed. In trauma, hyperfibrinolysis contributes to ongoing bleeding and coagulopathy. The survival benefit of TXA is time-dependent: early administration reduces bleeding deaths, but delayed administration loses benefit and may increase harm. The 3-hour threshold is the widely accepted therapeutic window derived from the CRASH-2 trial and incorporated into trauma resuscitation guidelines [1][2].

At 15:55, the patient is still within that window, with only 15 minutes remaining before the 3-hour mark at 16:10. Key point! The loading dose must be initiated now. Waiting even a few more minutes would push administration beyond the evidence-based window, after which TXA is generally avoided in trauma [1][2].

Dose and administration

The standard trauma regimen is 1 g IV over 10 minutes as a loading dose, followed by 1 g infused over 8 hours. The loading dose achieves rapid therapeutic plasma concentration when bleeding is active. The maintenance infusion sustains antifibrinolytic effect during the early post-injury period. Pushing the loading dose over 1 minute is unsafe because rapid IV administration of TXA can cause hypotension and other adverse effects. The ordered 10-minute infusion rate must be respected [3].

Why the other options are incorrect

Option 1 suggests pushing the dose over 1 minute to save time. This violates safe administration practice. TXA is not given as a rapid IV push; the 10-minute infusion is the standard loading method [3].

Option 2 suggests starting only the 8-hour infusion without the loading dose. This would fail to achieve prompt therapeutic levels during the critical early phase of hemorrhage. The loading dose is essential for rapid clot stabilization [1][3].

Option 3 suggests holding the drug because benefit ends 2 hours after injury. This is factually incorrect. The established window is 3 hours, not 2 hours. At 2 hours 45 minutes, the patient remains eligible for TXA [1][2].

Clinical decision-making in the emergency setting

The nurse must recognize that the clock starts at the time of injury, not at arrival or at the time the order is written. For this patient, injury occurred at 13:10. The drug arrives at 15:55. The elapsed time is 2 hours 45 minutes. Watch out! The remaining time within the 3-hour window is only 15 minutes. The nurse should prepare and start the 10-minute loading infusion without delay.

Safety considerations

TXA is generally well tolerated, but thromboembolic events are a recognized risk, particularly with delayed administration or in patients with pre-existing thrombotic risk factors [3]. The review by Lier et al. notes that the benefit-risk balance is most favorable when TXA is given early within the 3-hour window [3]. Orthopedic trauma literature similarly supports early TXA use to reduce blood loss and transfusion requirements, while acknowledging ongoing debate about optimal timing and thromboembolic risk .

The nurse’s priority is to initiate the ordered loading dose of TXA 1 g IV over 10 minutes immediately, because the patient is still within the 3-hour therapeutic window, with only 15 minutes remaining. The subsequent 1 g over 8 hours infusion should follow as ordered.References (research sources)

- [1]Tranexamic Acid Timing and Mortality Impact After Trauma.Research articleAli A, Gruen RL, Bernard SA, Burns B, Forbes AB, Gantner DC (2026) · DOI: 10.1016/j.annemergmed.2025.06.609

- [2]Tranexamic acid for trauma: optimal timing of administration based on the CRASH-2 and CRASH-3 trials.Research articleOsawa I, Goto T, Roberts I (2025) · DOI: 10.1093/bjs/znaf079

- [3]Tranexamic Acid for Acute Bleeding in Severely Traumatized Patients: Mortality, Neurological Outcomes, and Thromboembolic Risk.Research articleLier H, Maegele M, Hossfeld B. (2026) · DOI: 10.3238/arztebl.m2026.0046

## 임상 시나리오

TXA in Trauma: Time-Critical AdministrationLoading dose must start within 3 hours of injury
For major hemorrhage, give tranexamic acid 1 g IV over 10 minutes, then 1 g over 8 hours. The loading dose achieves rapid therapeutic levels; the infusion sustains antifibrinolytic effect.

The 3-hour therapeutic window is derived from CRASH-2. At 2 hours 45 minutes from injury, the patient is still within the window, so the loading dose should be started immediately.

CautionDo not delay administration. Once the 3-hour mark passes, TXA is generally avoided in trauma because benefit declines and harm may increase. Do not push the loading dose over 1 minute.

## 핵심 개념

- **Tranexamic acid** — An antifibrinolytic agent that inhibits plasminogen activation and stabilizes clots; used in trauma within 3 hours of injury.
- **CRASH-2 trial** — A large randomized trial showing time-dependent survival benefit of TXA in trauma, supporting use within 3 hours.
- **Hyperfibrinolysis** — Excessive clot breakdown contributing to coagulopathy and ongoing bleeding in trauma.
- **Loading dose** — An initial higher dose given rapidly to achieve therapeutic drug concentration quickly.
- **Therapeutic window** — The time period after injury during which a drug is effective and safe; for TXA in trauma, this is within 3 hours.

## 같은 주제 문제

- [Situation: A 58-year-old man with severe community-acquired pneumonia is intubated in the …](https://mymerci.kr/pages/nclex_q.php?qn_id=630016)
- [Situation: A 58-year-old man with severe community-acquired pneumonia is intubated in the …](https://mymerci.kr/pages/nclex_q.php?qn_id=630017)
- [Situation: A 58-year-old man with severe community-acquired pneumonia is intubated in the …](https://mymerci.kr/pages/nclex_q.php?qn_id=630018)
- [Situation: A 58-year-old man with severe community-acquired pneumonia is intubated in the …](https://mymerci.kr/pages/nclex_q.php?qn_id=630019)
- [Situation: A 62-year-old man arrives at the emergency department of a provincial hospital …](https://mymerci.kr/pages/nclex_q.php?qn_id=630020)
- [Situation: A 62-year-old man arrives at the emergency department of a provincial hospital …](https://mymerci.kr/pages/nclex_q.php?qn_id=630021)
- [Situation: A 62-year-old man arrives at the emergency department of a provincial hospital …](https://mymerci.kr/pages/nclex_q.php?qn_id=630022)
- [Situation: A 70-year-old woman with rheumatic heart disease is in the coronary care unit. …](https://mymerci.kr/pages/nclex_q.php?qn_id=630023)

---

More free questions: [기출문제](https://mymerci.kr/)

_학습 참고용입니다. 실제 임상은 최신 지침과 소속 기관 프로토콜을 따르세요._