6.1 Advanced Trauma Resuscitation, Hemorrhage & Damage Control
Key Takeaways
ATLS 11 uses xABCDE. Control immediately life-threatening external hemorrhage before continuing the primary survey when indicated.
The trauma lethal triad combines hypothermia, metabolic acidosis and coagulopathy. Hypocalcemia adds a fourth problem, worsening clotting and myocardial function. Citrated blood products can lower ionized calcium further.
Damage Control Resuscitation (DCR) balances permissive hypotension (target SBP 80–90 mmHg, MAP 50–60 mmHg) with 1:1:1 balanced blood component therapy, but permissive hypotension is strictly contraindicated in traumatic brain injury (consider SBP >=100 mmHg at ages 50–69, and >=110 at ages 15–49 or >=70; guide CPP by ICP).
For bleeding trauma, give TXA as soon as possible and within three hours: 1 g IV over ten minutes, then 1 g over eight hours. CRASH-2 found increased death from bleeding when treatment began after three hours; do not routinely initiate it beyond that window.
Viscoelastic testing guides components: prolonged R/CT suggests factor deficiency; prolonged K or low alpha angle suggests impaired fibrin formation; low MA/MCF suggests weak platelet-fibrin clot strength. Example lysis triggers are TEG LY30 >3% and ROTEM ML >15%; use the assay-specific protocol.
6.1 Advanced Trauma Resuscitation, Hemorrhage & Damage Control
Clinical Scenario: A 32-year-old unrestrained driver arrives at the Level 1 trauma bay following a high-speed collision. Vital signs: BP 74/42 mmHg, HR 142 bpm, RR 34 breaths/min, SpO2 91% on mask, GCS 13. The patient is pale and diaphoretic with an unstable pelvis and open femur fractures. Arterial blood gas shows: pH 7.14, PaCO2 28 mmHg, PaO2 68 mmHg, HCO3 9 mEq/L, base excess −16 mEq/L, lactate 7.8 mmol/L, ionized calcium 0.94 mmol/L, and core temperature 34.6°C.
ATLS Primary Survey & Hemorrhage Control
The Advanced Trauma Life Support (ATLS) primary survey rapidly detects and treats life-threatening injuries. ATLS 11 uses xABCDE, with rapid control of exsanguinating external hemorrhage when present:
- x – Exsanguinating External Hemorrhage: Control life-threatening external bleeding with direct pressure, wound packing or a limb tourniquet as appropriate. Apply a pelvic binder at the greater trochanters when an unstable pelvic fracture is suspected.
- A - Airway & Cervical Spine: Maintain manual in-line stabilization. Secure the airway for GCS or impending failure. Induce with hemodynamically stable agents (etomidate 0.3 mg/kg or ketamine 1–2 mg/kg); avoid propofol due to profound vasodilation.
- B - Breathing & Ventilation: Decompress tension pneumothorax immediately via needle thoracostomy (5th intercostal space, anterior axillary line) followed by tube thoracostomy (28–32 Fr).
- C - Circulation & Shock: Establish two large-bore peripheral IVs (14–16 gauge) or rapid infusion catheters. Initiate Damage Control Resuscitation and activate the Massive Transfusion Protocol (MTP).
- D - Disability: Document baseline GCS, pupillary size and reactivity, and gross lateralizing motor deficits.
- E - Exposure & Environment: Fully expose to reveal occult injuries, then initiate active external rewarming to halt hypothermia.
The Trauma Lethal Triad & The Lethal Diamond
Coagulopathic death in exsanguinating trauma is driven by the Lethal Triad:
- Hypothermia (Core Temp <35°C): Low temperature slows coagulation reactions and impairs platelet function.
- Metabolic Acidosis: Severe acidemia impairs clot formation. A base excess below −6 mEq/L (base deficit greater than 6 mEq/L) suggests substantial metabolic derangement.
- Coagulopathy: Trauma-induced coagulopathy (glycocalyx breakdown, hyperfibrinolysis) exacerbated by hemodilution and consumption.
Modern critical care expands this into the Lethal Diamond by incorporating hypocalcemia (ionized calcium below the normal range, generally 1.1–1.3 mmol/L). Extracellular calcium (Factor IV) is mandatory for clotting enzyme assembly and platelet activation. Citrate in transfused blood rapidly chelates calcium, worsening myocardial depression and coagulopathy.
Damage Control Resuscitation (DCR) & Permissive Hypotension
Damage Control Resuscitation balances organ perfusion against clot disruption:
- Permissive Hypotension: Targets Systolic Blood Pressure (SBP) 80–90 mmHg (MAP 50–60 mmHg) until surgical or endovascular hemostasis is secured. Normalizing pressure prematurely dislodges friable clots ("popping the clot") and accelerates bleeding.
- Minimizing Crystalloids: Excess crystalloid can cause dilutional coagulopathy, tissue edema and abdominal compartment syndrome. Chloride-rich 0.9% saline also promotes hyperchloremic acidosis; balanced crystalloids such as lactated Ringer's reduce that chloride load.
Warning
TBI Exception: Avoid permissive hypotension with concomitant TBI. In severe TBI, BTF supports considering SBP >=100 mmHg at ages 50–69 and >=110 mmHg at ages 15–49 or >=70. For major bleeding with severe TBI, an initial MAP >=80 mmHg supports perfusion. Once ICP is measured, adjust MAP toward an individualized CPP of 60–70 mmHg using CPP = MAP - ICP; a fixed MAP alone does not establish CPP.
Intraosseous Access
In adult cardiac arrest, attempt IV access first; IO access is reasonable when IV access is unsuccessful or not feasible. Do not interrupt CPR or defibrillation to obtain access. A trained operator selects an approved site such as proximal humerus or tibia, confirms landmarks and uses the device-specific insertion technique. Avoid a fractured or infected target bone and other manufacturer contraindications. Confirm a stable catheter and a flush without local swelling, secure it and monitor repeatedly for extravasation, dislodgement and compartment syndrome. Treat infusion pain in a conscious patient according to protocol. IO access is a temporary bridge: establish suitable venous access and remove the IO with the manufacturer's technique, inspecting the site and catheter afterward.
Massive Transfusion Protocol (MTP) & Tranexamic Acid (TXA)
Massive transfusion ( PRBC units/24 hr or units/1 hr) uses balanced components. A 1:1:1 ratio counts whole-blood-derived platelet-unit equivalents: for example, six PRBC units, six plasma units and one adult apheresis platelet dose (about six platelet units), rather than one apheresis bag per PRBC unit:
- Calcium Repletion: Check ionized calcium early and during massive transfusion. Replace calcium per protocol to maintain the normal range, generally 1.1–1.3 mmol/L.
- Tranexamic Acid (TXA): Competitive plasminogen inhibitor that halts hyperfibrinolysis. CRASH-2 supports early TXA for bleeding trauma; CRASH-3 evaluated a separate TBI population:
- Dose: 1 g IV over 10 minutes within 3 hours of injury, followed by 1 g IV over 8 hours.
- The 3-Hour Limit: In CRASH-2, starting TXA >3 hours after injury increased death due to bleeding. Give it early; do not routinely initiate it after three hours for traumatic hemorrhage.
Viscoelastic Testing: TEG & ROTEM Interpretation
Viscoelastic assays evaluate clot initiation, kinetics, strength and breakdown. The thresholds below are examples. Use the platform, reagent and local trauma algorithm:
| Assay Parameter | Clinical Significance | Pathologic Threshold | Targeted Hemostatic Replacement |
|---|---|---|---|
| TEG R-time / ROTEM CT | Clot initiation / Thrombin generation | Prolonged (>8 min / >240 s) | Plasma for factor replacement. Consider 4-factor PCC only when the bleeding protocol supports it and fibrinogen is adequate. |
| TEG K-time / alpha angle | Clot kinetics / Fibrin cross-linking | Prolonged K / Decreased (<53°) | Cryoprecipitate (10 units/pool) or Fibrinogen concentrate |
| TEG MA / ROTEM MCF | Platelet-fibrin clot strength | Decreased MA (<50 mm / <50 mm) | Platelets (1 apheresis unit) +/- Cryoprecipitate |
| TEG LY30 / ROTEM ML | Clot lysis / Fibrinolysis | Elevated LY30 (>3%) / ML (>15%) | TXA per trauma timing and dosing protocol |
Damage Control Surgery (DCS) Principles
When physiologic exhaustion threatens survival (pH <7.2, temp <35°C, refractory coagulopathy), DCS halts formal surgery:
- Abbreviated Laparotomy (Phase I): Rapid packing, vascular shunts, and simple hollow viscus closure within 60–90 minutes.
- Temporary Abdominal Closure (TAC): Negative pressure dressings or Bogota bags to avoid Abdominal Compartment Syndrome (IAP >20 mmHg with new organ failure).
- ICU Resuscitation (Phase II): Aggressive rewarming (>36°C), viscoelastic-guided hemostasis, and acidosis reversal.
- Planned Re-exploration (Phase III): Return to the operating room within 24–48 hours for definitive reconstruction and closure.
A 28-year-old male presents to the trauma bay following an unrestrained motor vehicle collision with severe traumatic brain injury (GCS 6, fixed right pupil) and blunt abdominal trauma with active intra-abdominal hemorrhage. Vital signs: BP 82/46 mmHg, HR 136 bpm, SpO2 93% on mechanical ventilation. What is the most appropriate hemodynamic resuscitation target for this patient?
Permissive hypotension targeting SBP 80–90 mmHg to minimize active intra-abdominal hemorrhage
Target SBP >=110 mmHg for this 28-year-old and initially MAP >=80 mmHg, using balanced blood components; adjust perfusion goals using ICP and CPP monitoring
Rapid infusion of 3 liters of 0.9% normal saline to normalize central venous pressure to 12 mmHg
Titration of phenylephrine monotherapy to achieve MAP >90 mmHg prior to administering blood products
A 44-year-old female with a shattered pelvic ring and retroperitoneal hematoma undergoes pelvic packing and massive transfusion. Her ICU thromboelastography (TEG) profile demonstrates: R-time 15 minutes (reference 4–8 min), K-time 2.1 minutes (reference 1–3 min), Alpha angle 62 degrees (reference 53–72 degrees), Maximum Amplitude (MA) 56 mm (reference 50–70 mm), and LY30 0.6% (reference <3%). Which targeted therapy is indicated based on this viscoelastic assay?
Transfusion of fresh frozen plasma (10–15 mL/kg)
Administration of 10 units of cryoprecipitate to correct delayed fibrin cross-linking
Transfusion of two apheresis units of platelets to address platelet dysfunction
Administration of an additional 2 g IV tranexamic acid bolus to treat hyperfibrinolysis
A 36-year-old male arrives at the trauma center 4.5 hours after sustaining extensive lower extremity crush injuries and pelvic fractures in an agricultural machinery incident. He is in hemorrhagic shock with a base excess of −11 mEq/L. The acute care nurse practitioner is evaluating the administration of tranexamic acid (TXA). Based on the CRASH-2 timing analysis, what is the correct recommendation regarding TXA?
Administer a 2 g rapid IV bolus over 5 minutes to compensate for the delayed presentation
Administer TXA 1 g IV bolus immediately, as antifibrinolytics improve survival regardless of time elapsed since injury
Administer TXA only if laboratory coagulation testing confirms an INR > 2.0
Withhold routine TXA initiation: starting treatment more than three hours after injury was associated with increased death due to bleeding in CRASH-2
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