CCS Integrated Cases

CCS case: trauma patient with hemodynamic instability

Clinical Overview and When to Suspect Hemodynamic Instability in Trauma

— "Persistent responder" stabilizes with <2 L crystalloid; "transient responder" improves then deteriorates; "non-responder" remains unstable despite resuscitation

— Blunt trauma (MVC, falls) dominates in US; penetrating trauma (GSW, stab) over-represented in urban centers

— Hemorrhagic (most common): chest, abdomen, pelvis, retroperitoneum, long bones, "floor" (external)

— Obstructive: tension pneumothorax, cardiac tamponade, massive PE (delayed)

— Cardiogenic: blunt cardiac injury, MI precipitating the trauma

— Neurogenic: high spinal cord injury (warm, bradycardic, hypotensive)

— Mechanism: ejection, fatality at scene, >20 ft fall, pedestrian struck, high-speed MVC

— Anatomic: penetrating torso wound, flail chest, pelvic instability, two or more long-bone fractures

— Physiologic: shock index (HR/SBP) >1.0, narrow pulse pressure, tachypnea, agitation

Definition for CCS purposes: Trauma patient with SBP <90 mmHg, HR >120, signs of poor perfusion (cool/clammy skin, altered mentation, lactate >4, base deficit ≤–6), or transient response to initial crystalloid bolus

Epidemiologic framing: Hemorrhage causes ~40% of trauma deaths and is the leading preventable cause; most occur within 6 hours of arrival

The four-bucket mental model for shock in trauma:

When to suspect early instability even before vitals tumble:

CCS pearl: On the CCS interface, the moment you see a trauma stem with unstable vitals, your first three orders should always be "IV access × 2 large bore, cardiac monitor, pulse oximetry" before any imaging — the simulator rewards parallel resuscitation and assessment, not sequential

Board pearl: Young patients compensate brutally well — a "normal" BP of 110/70 in a 22-year-old after major mechanism may already represent class III shock; trust HR, mentation, and lactate

Presentation Patterns and Key History

— Demand fluid volumes already infused, tourniquet times, GCS trajectory, and any prehospital TXA

— Allergies, Medications (anticoagulants, beta-blockers masking tachycardia), Past medical (cirrhosis, CAD, pregnancy), Last meal (anesthesia planning), Events/Environment

— Warfarin → 4-factor PCC + vitamin K 10 mg IV

— DOACs → andexanet alfa (apixaban/rivaroxaban) or idarucizumab (dabigatran); if unavailable, PCC

— Antiplatelets → platelet transfusion only if intracranial hemorrhage or active surgical bleed

— Lap belt + sudden deceleration → Chance fracture, hollow viscus injury, mesenteric tear

— Handlebar to abdomen → duodenal hematoma, pancreatic injury

— Restrained driver, steering wheel → blunt aortic injury, myocardial contusion, sternal fracture

— Pedestrian struck → Waddell triad (femur, torso, contralateral head)

— Fall from height landing on feet → calcaneal, tibial plateau, lumbar burst, basilar skull

Prehospital handoff (MIST format): Mechanism, Injuries suspected, Signs (vitals trend en route), Treatment given

AMPLE history — obtain in parallel with primary survey, not after:

Anticoagulant red flags that change management:

Pattern recognition by mechanism:

Pregnancy-specific clues: Gravid uterus displaces bowel cephalad; abruption may present only as uterine tenderness or fetal distress with maternal vitals near normal until decompensation

Step 3 management: When the stem says "patient was on apixaban for AFib" and now has unstable trauma — your differential weighting shifts dramatically toward occult hemorrhage (retroperitoneal, intracranial), and you should order non-contrast head CT + andexanet alfa even before symptoms localize

Key distinction: Neurogenic shock = hypotension with bradycardia and warm extremities below the lesion; hemorrhagic shock = hypotension with tachycardia and cool extremities — never assume neurogenic until hemorrhage is excluded by imaging

Physical Exam Findings and Hemodynamic Assessment

— Airway with C-spine: talk to the patient; if GCS ≤8, intubate. Maintain in-line stabilization, not traction

— Breathing: inspect, palpate, percuss, auscultate. Tension PTX = absent breath sounds + tracheal deviation + JVD + hypotension → needle decompression at 4th–5th ICS anterior axillary (adult) BEFORE imaging

— Circulation: two 18-gauge or larger IVs antecubital; assess capillary refill, pulse character, external bleeding; apply tourniquet for extremity hemorrhage, pelvic binder for unstable pelvis

— Disability: GCS, pupils, gross motor in all four extremities

— Exposure: fully undress, log-roll, rectal tone, examine back/perineum, then warm with Bair Hugger

— Class I (<15%, <750 mL): normal vitals, mild anxiety

— Class II (15–30%): tachycardia, narrowed pulse pressure, anxious

— Class III (30–40%): hypotension, tachycardia >120, confused, oliguric

— Class IV (>40%): obtunded, no urine output, impending arrest

— Seatbelt sign abdomen → mesenteric/hollow viscus injury

— Cullen/Grey-Turner → retroperitoneal bleed (late finding)

— Pelvic instability on single AP compression → pelvic ring disruption

— Beck triad (hypotension, JVD, muffled heart sounds) → tamponade

— Scrotal hematoma, blood at meatus, high-riding prostate → urethral injury — do NOT place Foley until retrograde urethrogram

Primary survey (ABCDE) — done in 60–90 seconds, repeated after every intervention:

Hemodynamic signs by class of hemorrhagic shock (ATLS):

Physical findings that localize hemorrhage:

CCS pearl: Order "vital signs q15min" initially in any unstable trauma case on CCS; downgrade to q1h only after two consecutive stable sets post-resuscitation

Board pearl: A trauma patient who is bradycardic and hypotensive is either neurogenic shock, beta-blocked, or in terminal decompensation — never reassuring

Diagnostic Workup — Initial Labs, Imaging, ECG, Biomarkers

— Type and crossmatch for 6 units PRBC (type-specific in 10 min, fully crossed in 45 min; use O-negative for women of childbearing age, O-positive otherwise while waiting)

— CBC, CMP, lactate, arterial blood gas with base deficit, coagulation panel (PT/INR, aPTT, fibrinogen), TEG or ROTEM if available

— Beta-hCG in all reproductive-age females, ethanol, urine tox, troponin if blunt chest trauma

— Lactate >4 or base deficit ≤–6 = occult hypoperfusion even with normal BP

— Chest X-ray: PTX, hemothorax, widened mediastinum (>8 cm) suggesting aortic injury, diaphragmatic rupture

— Pelvic X-ray: ring disruption; if open-book fracture and unstable → binder + angio/REBOA pathway

— FAST exam (Focused Assessment with Sonography for Trauma): four views — perihepatic (Morison's), perisplenic, pelvic, pericardial; e-FAST adds bilateral pleura

— Positive FAST + unstable → straight to OR for laparotomy, no CT

— Negative FAST + unstable → search elsewhere: pelvis, chest, retroperitoneum, external; consider DPL if FAST unreliable

— Positive FAST + stable → CT abdomen/pelvis with IV contrast to characterize

Stat labs ordered on arrival (CCS order set, time 0):

Imaging — trauma bay standard triad:

Interpreting FAST in the unstable patient:

ECG indications: any blunt chest trauma, elderly, syncope-preceding trauma; new arrhythmia or RBBB suggests blunt cardiac injury → admit on telemetry with serial troponins

Step 3 management: The unstable trauma patient does NOT go to CT. "Too unstable for the doughnut of death" — definitive control in OR or IR. Reserve pan-scan for stable or transient responders who stabilize

Key distinction: FAST detects free fluid (~200 mL minimum), not solid organ injury grade — a negative FAST does not exclude splenic laceration in a stable patient who still warrants CT

Diagnostic Workup — Advanced and Confirmatory Studies

— Indicated in stable or stabilized trauma patients with significant mechanism or exam findings

— Identifies solid organ lacerations (AAST grading I–V), active contrast extravasation ("blush" → angioembolization candidate), bowel/mesenteric injury, vertebral fractures, aortic injury

— CT angiography of the chest is the gold standard for blunt aortic injury (replacing TEE/aortography)

— Intraperitoneal rupture → surgical repair; extraperitoneal → Foley drainage usually sufficient

— Positive: >10 mL gross blood on aspiration, >100,000 RBC/mm³, bile, bacteria, or food particles

— ABC score ≥2 (penetrating mechanism, SBP ≤90, HR ≥120, positive FAST)

— Shock index >1.0 persistent

— Anticipated need >10 units PRBC in 24h

— Recheck FAST at 30 min if initially negative but patient deteriorates

— Serial hemoglobin q4–6h in solid organ injuries managed non-operatively

— Lactate clearance: aim for >10%/hour reduction — failure to clear by 6h predicts mortality

CT pan-scan (head, C-spine, chest, abdomen/pelvis with IV contrast):

CT cystogram: for gross hematuria + pelvic fracture to evaluate bladder rupture

Retrograde urethrogram: before Foley if blood at meatus, perineal hematoma, or high-riding prostate

Diagnostic peritoneal lavage (DPL): rarely used now, but indicated when FAST is equivocal and patient too unstable for CT

Massive transfusion protocol (MTP) triggers:

Repeat assessments on CCS clock:

CCS pearl: After ordering CT pan-scan, advance the simulated clock by 30–60 minutes — don't keep re-examining at 5-minute intervals; the CCS engine rewards realistic time progression

Board pearl: Contrast "blush" on CT in a stable patient with splenic or pelvic injury → call interventional radiology for angioembolization, not the OR — this is the modern non-operative management paradigm

Risk Stratification and First-Line Management Logic

— Rapid responder: normalizes after 1–2 L crystalloid and stays normal → likely <20% blood loss, admit for observation, CT to characterize

— Transient responder: improves then deteriorates → ongoing hemorrhage, initiate MTP, source control imminent (OR vs IR)

— Non-responder: no improvement despite resuscitation → immediate source control; consider obstructive causes (tamponade, tension PTX) that won't respond to volume

— Permissive hypotension (target SBP 80–90 mmHg) until hemorrhage control, EXCEPT in TBI where target MAP ≥80 / SBP ≥110

— Limit crystalloid to ≤1 L; excess worsens coagulopathy, acidosis, ARDS, abdominal compartment syndrome

— Early balanced blood products: 1:1:1 ratio of PRBC : FFP : platelets

— Tranexamic acid (TXA) 1 g IV over 10 min within 3 hours of injury, then 1 g over 8 h — reduces mortality (CRASH-2)

— Hypothermia (<35°C) → impairs clotting cascade

— Acidosis (pH <7.2) → impairs factor function

— Coagulopathy → bleeding begets bleeding

— Break the cycle: warm fluids/blood, Bair Hugger, normalize pH with resuscitation (not bicarb)

— IV access × 2, 16-gauge, antecubital

— Cardiac monitor, pulse ox, BP cuff q5min

— O2 via non-rebreather 15 L/min

— Type and cross 6 units, activate MTP if ABC ≥2

— TXA 1 g IV

— Warmed LR 1 L bolus (cap at 1–2 L)

— FAST, CXR, pelvic XR at bedside

— Foley after RUG if indicated; NG tube

— Surgery consult now, not after imaging

The "responder" trichotomy drives every decision:

Initial resuscitation strategy — "damage control resuscitation":

Lethal triad of trauma:

CCS initial order set (time 0–10 min) for unstable blunt trauma:

Step 3 management: The CCS clock penalizes both action AND inaction inappropriately — don't keep bolusing crystalloid past 2 L while the patient bleeds; transition to blood products and call surgery

Pharmacotherapy — First-Line Regimen in Trauma Resuscitation

— PRBC: O-neg for females <50, O-pos otherwise until type-specific; target Hgb 7–8 g/dL in stable, higher during active bleeding

— FFP: corrects coagulopathy; 1:1 with PRBC in MTP; dose 10–15 mL/kg

— Platelets: 1 unit apheresis per 6 PRBC; transfuse if <50K with bleeding, <100K if TBI

— Cryoprecipitate: if fibrinogen <150–200 mg/dL; 10 units typical adult dose

— 1 g IV bolus over 10 min within 3 hours of injury, then 1 g infusion over 8 h

— Reduces all-cause mortality and death from bleeding; no benefit and possible harm if given >3 hours after injury

— Citrate in transfused blood chelates Ca²⁺ → hypocalcemia worsens coagulopathy and cardiac function

— Give 1 g calcium chloride IV (central line preferred) or 3 g calcium gluconate per 4 units PRBC

— Check ionized calcium q1h during MTP; target >1.1 mmol/L

— Warfarin: 4-factor PCC 25–50 units/kg + vitamin K 10 mg IV

— Dabigatran: idarucizumab 5 g IV

— Apixaban/rivaroxaban: andexanet alfa (bolus + 2 h infusion); alternative 4F-PCC 50 units/kg

— Heparin: protamine 1 mg per 100 units heparin in last 2–3 h

— Use only after adequate volume/blood resuscitation, or in neurogenic shock

— Norepinephrine first-line; phenylephrine for bradycardic neurogenic shock

— Avoid as substitute for blood — vasoconstriction in an under-filled tank causes ischemia

Blood products (the actual "first-line drugs" in hemorrhagic shock):

Tranexamic acid:

Calcium replacement:

Reversal agents (when indicated by med history):

Vasopressors — controversial and second-line:

Analgesia: fentanyl 25–50 mcg IV (hemodynamically neutral); avoid morphine in hypotension

Antibiotics: cefazolin 2 g IV for open fractures; add gentamicin/piperacillin-tazobactam for grossly contaminated or Gustilo III; tetanus prophylaxis

Board pearl: Lactated Ringer's is preferred over normal saline in trauma — large-volume NS causes hyperchloremic acidosis worsening the lethal triad

Procedures and Invasive Management — Damage Control Surgery and IR

— Chest: tube thoracostomy 28–32 Fr at 5th ICS midaxillary; >1500 mL initial output OR >200 mL/hr × 4 hours → thoracotomy

— Abdomen: positive FAST + unstable → exploratory laparotomy; "damage control" — pack, control bleeding, leave abdomen open with vacuum dressing, return in 24–48 h for definitive repair

— Pelvis: binder first; unstable open-book → preperitoneal packing and/or angioembolization; venous bleeding (80%) responds to packing, arterial (20%) to IR

— Extremity: tourniquet, then OR for vascular repair; document time of tourniquet placement

— Penetrating chest trauma with witnessed loss of vitals <15 min ago

— Penetrating non-chest trauma with witnessed arrest <5 min

— Blunt trauma with witnessed arrest <10 min (controversial, low yield)

— Goals: relieve tamponade, cross-clamp aorta, internal cardiac massage, control intrathoracic hemorrhage

— Bridge to definitive control for non-compressible torso hemorrhage below diaphragm

— Zone 1 (above celiac) for abdominal hemorrhage, Zone 3 (infrarenal) for pelvic hemorrhage

— Time-limited: <30–60 min to avoid ischemic injury

— Splenic blush in stable patient → splenic artery embolization, spleen preservation

— Pelvic arterial bleeding → selective embolization of internal iliac branches

— Hepatic injuries with active extravasation

Definitive hemorrhage control pathways by anatomic source:

Resuscitative thoracotomy (ED thoracotomy) — narrow indications:

REBOA (Resuscitative Endovascular Balloon Occlusion of the Aorta):

Angioembolization (IR):

Pericardiocentesis vs pericardial window: pericardiocentesis is temporizing for tamponade; definitive treatment is subxiphoid window or sternotomy in trauma

CCS pearl: When you consult "Trauma Surgery, urgent" on CCS, also order "prepare OR" in parallel — the simulator allows concurrent orders, and time-to-OR is a graded outcome

Step 3 management: Damage control surgery is staged — initial laparotomy for hemorrhage and contamination control only, ICU for rewarming and correcting coagulopathy, then back to OR in 24–48 h for definitive anastomosis and closure

Special Populations — Elderly and Renal/Hepatic Impairment

— Beta-blockers and calcium-channel blockers blunt tachycardic response — HR of 90 may be the patient's "max"

— Stiff vasculature → less ability to vasoconstrict; rely on MAP, mentation, urine output, lactate

— Baseline anticoagulation prevalent (AFib, mechanical valves) → all elderly trauma get head CT regardless of GCS and INR/DOAC level

— Cervical spine injuries occur with low mechanisms (ground-level falls); type II odontoid fracture is classic

— SBP <110 (not <90) defines hypotension

— Activate trauma team for any ground-level fall on anticoagulation

— Admit even "minor" rib fractures — mortality rises 19% per additional rib fracture over age 65 (pulmonary toilet, regional anesthesia)

— IV contrast for CT: in unstable trauma, the diagnostic benefit virtually always outweighs contrast nephropathy risk — do not withhold

— Avoid NSAIDs for analgesia

— Adjust antibiotic dosing (e.g., cefazolin unchanged, but vancomycin and aminoglycosides require renal dosing)

— LMWH for VTE prophylaxis: dose-reduce if CrCl <30; consider unfractionated heparin

— Baseline coagulopathy (elevated INR not from warfarin) — replace with FFP, not just vitamin K

— Thrombocytopenia from splenic sequestration → low threshold for platelet transfusion

— Reduced fibrinogen production → cryoprecipitate liberally

— Watch for hepatic encephalopathy precipitated by GI bleeding from injury, transfusion, infection

The elderly trauma patient is deceptively unstable:

Lower thresholds in geriatric trauma:

Renal impairment considerations:

Hepatic impairment:

Frailty assessment post-stabilization informs goals of care and rehab planning

CCS pearl: Order "Geriatrics consult" and "Physical therapy/Occupational therapy evaluation" on Day 1 for any elderly trauma patient — early mobility and discharge planning are graded outcomes

Board pearl: An elderly patient on warfarin with a "negative" head CT after a fall still warrants 24-hour observation and repeat CT if symptomatic — delayed intracranial hemorrhage is a documented risk

Special Populations — Pregnancy, Pediatric, and Other Subgroups

— Resuscitate the mother first — best fetal resuscitation is maternal resuscitation

— Left lateral decubitus tilt (15°) after 20 weeks to relieve IVC compression by gravid uterus

— Physiologic changes: HR baseline +15, BP −10/−15 in 2nd trimester, plasma volume +50% (can lose 30–35% before showing hypotension)

— Imaging: shield uterus where possible; CT abdomen exposes fetus to ~25 mGy (below teratogenic threshold of 50–100 mGy) — never withhold indicated imaging

— Kleihauer-Betke test in all Rh-negative pregnant trauma patients; give RhoGAM 300 mcg IM within 72 h

— Continuous fetal monitoring for ≥4 h after viability (≥23 weeks); extend to 24 h if contractions, abdominal pain, vaginal bleeding, or abnormal tracing

— Perimortem C-section within 4 minutes of maternal arrest at ≥23 weeks

— Larger head : body ratio → more head injuries; thin chest wall → pulmonary contusion without rib fractures

— Vitals norms vary by age; hypotension is late — children compensate then crash

— Estimate weight: Broselow tape; drug doses and tube sizes by weight

— Fluid bolus 20 mL/kg LR, repeat once; then 10 mL/kg PRBC

— Non-accidental trauma red flags: posterior rib fractures, metaphyseal corner fractures, retinal hemorrhages, multiple injuries different ages → mandated report to CPS

Pregnant trauma patient:

Placental abruption: vaginal bleeding (may be concealed), uterine tenderness, contractions, fetal distress — leading cause of fetal death in trauma

Pediatric trauma patient:

Bariatric and pregnant patients: consider difficult airway equipment early; positioning critical

Step 3 management: In a pregnant trauma patient at 28 weeks with stable maternal vitals but fetal heart tones showing late decelerations — obstetric consult and continuous monitoring, prepare for emergent C-section even if mother appears fine; the fetus is the more sensitive monitor of placental perfusion

Key distinction: Pediatric hypotension is a pre-arrest sign, not a class-III-shock sign — act on tachycardia and capillary refill, never wait for BP to fall

Complications and Adverse Outcomes

— Exsanguination — leading cause of preventable trauma death

— Transfusion-related acute lung injury (TRALI) — bilateral infiltrates within 6 h of transfusion; supportive care

— Transfusion-associated circulatory overload (TACO) — diurese, slow rate

— Hyperkalemia from massive transfusion of stored blood — monitor and treat

— Hypothermia, acidosis, coagulopathy — the lethal triad

— Bladder pressure >20 mmHg with new organ dysfunction (oliguria, elevated peak airway pressures, hypoxia, hypotension)

— Risk factors: large-volume crystalloid resuscitation, packing, bowel edema

— Treatment: decompressive laparotomy; medical management (paralysis, NG decompression, drainage) is temporizing

— Pain out of proportion, pain with passive stretch, pallor, paresthesia, paralysis, pulselessness (late)

— Measure compartment pressures: ΔP (DBP − compartment) <30 mmHg → emergent fasciotomy

— Crush injuries → rhabdomyolysis → CK, urine myoglobin, aggressive IVF, monitor K⁺, alkalinize urine

— ARDS: lung-protective ventilation (6 mL/kg IBW, plateau <30, PEEP titration, prone if PaO₂/FiO₂ <150)

— VTE: start chemoprophylaxis (enoxaparin 30 mg BID) within 24–48 h of hemorrhage control; IVC filter for high-risk patients with contraindications

— VAP: elevate HOB 30°, daily sedation interruption, oral care with chlorhexidine, early extubation

— Acute kidney injury from shock, contrast, rhabdomyolysis

— Surgical site infection, sepsis, missed injuries on tertiary survey

Early complications (first 24 hours):

Abdominal compartment syndrome:

Compartment syndrome of extremity:

Delayed complications (days 2–10):

Long-term: PTSD (screen at follow-up), chronic pain, disability, opioid use disorder risk

CCS pearl: Always perform a tertiary survey in your CCS workflow on hospital Day 1–2 — re-examine head to toe to catch missed injuries (15% miss rate is documented in unstable trauma); order this explicitly as "Tertiary survey by trauma team"

When to Escalate — ICU, Consults, and Disposition

— Ongoing transfusion need or hemodynamic lability

— Mechanical ventilation

— Severe TBI (GCS ≤12) with need for ICP monitoring

— Spinal cord injury with respiratory compromise

— Cardiac contusion with arrhythmia

— Post-damage-control laparotomy with open abdomen

— Elderly with multiple comorbidities and ≥3 rib fractures

— Trauma/general surgery — always for unstable trauma

— Anesthesia — airway, OR readiness

— Blood bank — MTP activation

— Interventional radiology — if contrast blush or pelvic arterial bleed candidate

— Neurosurgery — for any intracranial blood, depressed skull fracture, focal deficit

— Orthopedic surgery — pelvic ring, open fractures, dislocations

— Cardiothoracic — for hemothorax >1500 mL initial or aortic injury

— OB/Gyn — pregnant >20 weeks

— Penetrating injury to head/neck/torso at non-trauma center

— GCS ≤8 without neurosurgery on-site

— Pelvic fracture with hemodynamic instability without IR

— Major burns, complex pediatric trauma

— Stabilize first (ABCs, blood products en route), then transfer — EMTALA requires accepting hospital agreement and physician-to-physician communication

— ICU: vasopressors, ventilator, active bleeding, neuro monitoring

— Step-down: telemetry, frequent vitals, pain control, post-op stable

— Floor: stable solid organ injury under observation, isolated orthopedic injuries

ICU admission criteria after stabilization:

Mandatory early consults (within first hour):

Transfer criteria (to higher-level trauma center):

Step 3 management: On CCS, when transferring, order "Transfer to Level 1 trauma center via ALS ground or air" with continuation of blood products and TXA infusion during transport; document physician-to-physician acceptance — failure to communicate handoff is graded

Floor vs step-down vs ICU decision tree:

Board pearl: A "stable" splenic laceration grade III being managed non-operatively still requires 48 h of bed rest, ICU or step-down for first 24 h, serial hemoglobins, and inpatient observation 3–5 days before discharge

Key Differentials — Same-Category Causes of Trauma Hypotension

— External — visible bleeding, scalp lacerations (high-volume in children), open fractures

— Thoracic cavity — hemothorax detected by CXR and chest tube output

— Abdominal cavity — FAST positive, CT for grade

— Retroperitoneum — usually pelvic fracture-associated; not detected by FAST; requires CT or angio

— Thigh/long bones — femur fracture can sequester 1–2 L; bilateral femur fractures alone can cause shock

— Chest tube initial output >1500 mL or >200 mL/h × 4 h → operative thoracotomy

— Positive FAST in pericardial view → tamponade (obstructive overlap)

— Unstable pelvis on exam + positive FAST → both abdominal AND pelvic bleeding — laparotomy first, then pelvic packing/embolization

— Dilutional from crystalloid resuscitation

— Trauma-induced coagulopathy (TIC) — endothelial activation, hyperfibrinolysis; treat with balanced products + TXA

— Pre-existing anticoagulation — reverse aggressively

— Hypothermia-induced — rewarm; coagulation cascade is temperature-dependent

— Blunt aortic injury — widened mediastinum on CXR, confirm with CTA; repair endovascular (TEVAR) preferred

— Pelvic arterial — angioembolization

— Extremity — tourniquet, OR repair, fasciotomy for prolonged ischemia

— Visible external loss is almost always overestimated by bystanders, underestimated in clothing

— Femur shaft fracture = up to 1.5 L; pelvic = up to 3–4 L; tibia = up to 750 mL

Within hemorrhagic shock, localize the "five places blood hides":

Distinguishing features at the bedside:

Coagulopathic bleeding without surgical source:

Vascular injuries causing rapid hemorrhage:

Internal vs external blood loss estimation:

Key distinction: A patient with hemothorax and positive FAST — chest tube first (relieves obstructive and hemorrhagic component), then laparotomy. Always address both compartments

CCS pearl: If your unstable trauma patient remains hypotensive after 2 units PRBC and you cannot localize the bleed — re-FAST, repeat CXR, examine pelvis, look at the back; the missed bleed is usually one of these five

Key Differentials — Other-Category Causes of Shock in Trauma

— Tension pneumothorax: absent breath sounds, JVD, hyperresonance, tracheal deviation → needle decompression, then tube thoracostomy. Clinical diagnosis — do not wait for CXR

— Cardiac tamponade: Beck triad, pulsus paradoxus, pericardial fluid on FAST → pericardiocentesis as bridge, then surgical window/sternotomy

— Massive pulmonary embolism: rare immediately post-trauma; more common days later — RV strain on echo, hypoxia, tachycardia

— Air embolism: penetrating lung injury with positive pressure ventilation → left lateral Trendelenburg, aspirate from central line

— Blunt cardiac injury: anterior chest trauma, new arrhythmia/RBBB, elevated troponin, echo wall motion abnormality. Most resolve with telemetry; severe cases need pressors/IABP

— Acute MI causing the trauma: elderly driver crashes after STEMI — get ECG and troponin in any elderly unexplained MVC

— Pericardial tamponade from delayed effusion

— Spinal cord injury above T6 → loss of sympathetic outflow → vasodilation + unopposed vagal tone

— Hypotension + bradycardia + warm dry skin below lesion

— Treat with fluids, then norepinephrine (alpha + beta) or phenylephrine + atropine if bradycardic

— Hemorrhage MUST be excluded first — coexistence is common

Obstructive shock — must exclude before assuming hemorrhage:

Cardiogenic shock in the trauma patient:

Neurogenic shock:

Septic shock: delayed presentation (days after injury) — bowel injury, contaminated wound, pneumonia

Anaphylaxis: consider with latex, contrast, antibiotics — wheezing, urticaria, hypotension; treat with epinephrine

Adrenal crisis: chronic steroid use, missed dose, stress of trauma → hydrocortisone 100 mg IV

Key distinction: Tension pneumothorax vs cardiac tamponade — both cause obstructive shock with JVD, but breath sounds asymmetric in tension PTX, normal in tamponade; FAST pericardial view is the bedside discriminator

Step 3 management: Always think HOTNESS mnemonic — Hemorrhage, Obstruction (tension PTX/tamponade), Tank (neurogenic), Nerves (high spinal), Endocrine (adrenal), Sepsis, Septic source — before settling on a diagnosis

Secondary Prevention, Discharge Medications, and Long-Term Plan

— VTE prophylaxis: continue enoxaparin 40 mg SC daily for 2–4 weeks for major orthopedic injuries (pelvic, hip, complex lower extremity); longer for spinal cord injury

— Analgesia: multimodal — acetaminophen 1 g q6h scheduled, ibuprofen 400–600 mg q6h if no renal/bleeding concerns, gabapentin for neuropathic; opioids short course only (3–7 days), with naloxone co-prescription, and CDC opioid risk discussion

— Bowel regimen: docusate + senna while on opioids

— Tetanus: Tdap if not received in 10 years (or 5 years for tetanus-prone wounds)

— Antibiotics: completed per indication (e.g., open fracture 24–72 h post-closure)

— Resumption of anticoagulation after intracranial hemorrhage: shared decision; typically 1–2 weeks for AFib with low CHA₂DS₂-VASc, longer for mechanical valves on case-by-case

— Return precautions: worsening pain, fever, shortness of breath, abdominal distension, new bleeding, neuro deficits

— Activity restrictions: no heavy lifting × 6 weeks for laparotomy, no contact sports × 3 months post-splenic preservation

— Driving restriction until off opioids and orthopedically cleared

— Alcohol screening and brief intervention (SBIRT) — mandatory at Level 1 trauma centers; refer to outpatient counseling if positive AUDIT-C

— Seatbelt, helmet, child car seat education

— Gun safety, lock boxes, especially with kids or depression

— Fall prevention in elderly: home safety eval, vision check, vitamin D, medication review (especially benzodiazepines, anticholinergics)

— Pneumococcal (PCV20 or PCV15→PPSV23), meningococcal (MenACWY + MenB), Hib — give ≥14 days post-op if possible

— Annual influenza; lifelong infection awareness with fever

Discharge medication checklist for the post-trauma patient:

Counseling at discharge — required documentation:

Injury prevention counseling:

Vaccinations after splenectomy:

Board pearl: Asplenic patients need standby antibiotics (amoxicillin-clavulanate) for febrile illnesses and a medical alert bracelet — counsel about overwhelming post-splenectomy infection (OPSI)

Step 3 management: SBIRT (Screening, Brief Intervention, Referral to Treatment) for alcohol is a billable, mandated component of trauma care — order it explicitly

Follow-Up, Monitoring Parameters, and Rehab

— Trauma surgery clinic: 1–2 weeks for wound check, suture/staple removal, review imaging

— Primary care: 1–2 weeks for medication reconciliation, mental health check, opioid taper

— Subspecialty: orthopedics at 2–4 weeks for fracture follow-up imaging; neurosurgery at 4–6 weeks for resolved hematomas; urology after pelvic/GU injuries

— Repeat imaging: CT abdomen at 2–4 weeks for solid organ injuries managed non-operatively (especially grade III–IV spleen/liver); CT chest for resolving pulmonary contusion if symptomatic

— Physical therapy referral at discharge for any orthopedic, spinal cord, or TBI injury

— Occupational therapy for ADL impairment, especially elderly

— Inpatient rehab vs skilled nursing facility decision based on FIM score and tolerance of ≥3 h therapy daily

— Speech therapy for TBI with cognitive/swallow deficits

— Screen for PTSD at 1 and 3 months using PCL-5; up to 25% of major trauma survivors develop PTSD

— Screen for depression (PHQ-9), substance use (AUDIT, DAST)

— Refer early — trauma-focused CBT, EMDR, SSRIs first-line

— Non-operative splenic injury: avoid contact sports 3 months, repeat imaging if symptomatic, monitor for delayed rupture

— Rib fractures: incentive spirometry, watch for pneumonia, regional analgesia (intercostal blocks, epidural) if severe

— TBI: post-concussive symptoms checklist, gradual return-to-work/school, avoid second-impact syndrome

— Pelvic fracture: weight-bearing status per ortho, watch for heterotopic ossification

Standard post-discharge cadence:

Functional rehabilitation:

Mental health follow-up:

Specific monitoring parameters:

CCS pearl: Before "discharging" on CCS, always order "Follow-up with trauma surgery in 2 weeks," "PT/OT outpatient," "PCP in 1 week," and "Depression/PTSD screening at follow-up" — the simulator credits explicit transitions of care

Step 3 management: Post-discharge calls within 48–72 h reduce readmissions; many trauma centers have nurse navigator programs — order this explicitly when available, and document medication reconciliation occurred

Ethical, Legal, and Patient Safety Considerations

— Implied consent applies when the patient lacks capacity (unconscious, intoxicated, severely altered) and the intervention is emergent and life-saving — no surrogate or formal consent needed

— Document the capacity assessment and emergent indication

— As soon as feasible, identify a surrogate (spouse > adult child > parent > sibling in most state hierarchies); obtain formal consent for non-emergent next steps

— A competent adult may refuse blood products even in life-threatening hemorrhage

— Document the conversation, offer alternatives (cell saver, factor concentrates, TXA, erythropoietin, iron); these are usually acceptable

— For minors, court order can override parental refusal of life-saving transfusion — involve hospital legal/ethics immediately

— Suspected child abuse → state CPS

— Suspected elder abuse → adult protective services

— Intimate partner violence — screening required, reporting laws vary by state; offer resources, safety plan

— Gunshot wounds and stab wounds → law enforcement notification (state-mandated)

— Animal bites for rabies surveillance

— Handoff failures cause missed injuries — use structured handoff (SBAR, I-PASS)

— Tertiary survey reduces missed injury rate from 15% to <5%

— Medication reconciliation at every transition (ED → OR → ICU → floor → discharge)

— VTE prophylaxis pause/resume documentation

— Trauma patients with non-survivable injuries: early palliative care consult, family meeting, organ donation discussion via OPO (Organ Procurement Organization — physicians do not approach families directly per federal law)

— Brain death determination per institutional protocol after correcting confounders (hypothermia, drugs)

— Time of arrival, time of each major intervention (chest tube, transfusion, OR), time of consult calls

— Mechanism, mechanism of injury, exam findings, response to interventions

Informed consent in the unstable trauma patient:

Jehovah's Witness and blood refusal:

Mandatory reporting:

Patient safety in trauma transitions:

End-of-life considerations:

Documentation pearls:

Step 3 management: A 16-year-old in hemorrhagic shock whose Jehovah's Witness parents refuse transfusion — obtain emergency court order; physicians have ethical and legal duty to transfuse the minor to preserve life pending court ruling

Board pearl: The OPO, not the treating physician, approaches families about donation — separating clinical care from donation discussion prevents conflict of interest and is federally mandated

High-Yield Associations and Rapid-Fire Clinical Facts

— Lap belt only → Chance fracture + hollow viscus injury

— Steering wheel/sternal fracture → blunt cardiac and aortic injury

— Handlebar → duodenal hematoma, pancreatic transection

— Pedestrian struck (adult) → Waddell triad

— Fall from height landing on feet → calcaneal + lumbar burst (L1) + renal pedicle

— Posterior knee dislocation → popliteal artery injury — ABI mandatory

— Anterior shoulder dislocation → axillary nerve injury (deltoid sensation/function)

— First and second rib fractures → high-energy mechanism, consider aortic and brachial plexus injury

— Widened mediastinum >8 cm on supine CXR → CTA chest for aortic injury

— Base deficit ≤–6 or lactate >4 → occult shock

— Free air on imaging → bowel perforation, OR

— Free fluid without solid organ injury → bowel/mesenteric injury, OR

— Persistent air leak from chest tube → bronchial injury, bronchoscopy

— ATLS class III shock = 30–40% blood loss = ~1500–2000 mL in 70 kg adult

— TXA window: within 3 hours

— MTP ratio: 1:1:1

— Permissive hypotension target: SBP 80–90 (not in TBI)

— TBI target: SBP ≥110, MAP ≥80, CPP 60–70, ICP <22

— Pelvic fracture blood loss: up to 3–4 L

— Chest tube thoracotomy criteria: 1500 mL initial OR 200 mL/h × 4 h

— Beck triad — tamponade

— Cushing triad (HTN, bradycardia, irregular respirations) — elevated ICP

— Battle sign / raccoon eyes / hemotympanum / CSF leak — basilar skull fracture

— Kehr sign — left shoulder pain from diaphragmatic irritation (splenic rupture)

Mechanism → injury pearls:

Lab and imaging triggers:

Numbers to memorize:

Quick eponyms:

Key distinction: Blunt vs penetrating priorities — blunt mandates careful systematic imaging (often pan-scan); penetrating with instability mandates OR almost always, with imaging limited to CXR/FAST

Board pearl: Hypotension after blunt chest trauma that doesn't respond to fluids and has distant heart sounds — pericardial window in OR, not pericardiocentesis in trauma bay

Board Question Stem Patterns

— "25 y/o M after MVC, initial BP 80/50, HR 130, given 2 L LR, BP improves to 110/70, HR 100; 20 min later BP again 85/55." Answer: activate MTP, OR for laparotomy — transient responders have ongoing hemorrhage requiring source control

— "Stab wound to left chest, BP 70/40, JVD, muffled heart sounds, FAST shows pericardial fluid." Answer: OR for pericardial window/sternotomy — pericardiocentesis only as temporizing bridge

— "28-week pregnant, MVC, mother stable, fetal heart tones show late decels." Answer: continuous fetal monitoring, OB consult, Kleihauer-Betke, RhoGAM if Rh-negative; prepare emergent C-section

— "85 y/o on warfarin, fell at home, GCS 15, no focal deficit, INR 3.2." Answer: non-contrast head CT, 4-factor PCC + vitamin K, admit for observation, repeat CT in 24 h

— "Open-book pelvic fracture, BP 80/40, negative FAST." Answer: pelvic binder, MTP, angioembolization (or preperitoneal packing if no IR available)

— "Fall from height, paraplegic exam, BP 80/50, HR 55, warm extremities." Answer: rule out hemorrhage first (FAST, CT), then norepinephrine for neurogenic shock, methylprednisolone is not standard

— "Tibial fracture, pain out of proportion, pain with passive dorsiflexion, paresthesia." Answer: emergent fasciotomy, do not wait for pulselessness

— "Penetrating chest, chest tube returns 1800 mL immediately." Answer: thoracotomy in OR

— "MVC, widened mediastinum, BP labile." Answer: CTA chest, blood pressure control (esmolol, target SBP <120), endovascular repair (TEVAR)

— "Competent adult refuses blood." Answer: respect refusal, document, offer alternatives (TXA, cell saver, factors). If minor → emergent court order

Classic stem 1 — The transient responder:

Classic stem 2 — Penetrating chest with tamponade:

Classic stem 3 — Pregnant trauma:

Classic stem 4 — Elderly on warfarin, ground-level fall:

Classic stem 5 — Pelvic fracture with hypotension:

Classic stem 6 — Neurogenic shock:

Classic stem 7 — Compartment syndrome:

Classic stem 8 — Massive hemothorax:

Classic stem 9 — Blunt aortic injury:

Classic stem 10 — Jehovah's Witness with hemorrhage:

CCS pearl: Stems with "BP improved with 2 L crystalloid but now dropping again" are transient responders — your next move is blood products + OR, not more crystalloid

One-Line Recap

The hemodynamically unstable trauma patient requires simultaneous resuscitation and source control — stop the bleeding, give blood not crystalloid, and never delay the OR for the CT scanner.

— Two large-bore IVs, type-O blood early, 1:1:1 ratio, TXA within 3 h, permissive hypotension (SBP 80–90) until source control — except in TBI (SBP ≥110)

— Calcium replacement during MTP; warm everything; correct coagulopathy with products, not just labs

— Five places blood hides: external, chest, abdomen, pelvis/retroperitoneum, thighs

— Positive FAST + unstable → OR; negative FAST + unstable → find it elsewhere (CXR, pelvis XR, external exam)

— Tension PTX and tamponade are clinical diagnoses — treat before imaging

— Elderly: lower threshold for everything; reverse anticoagulation aggressively; head CT for any fall

— Pregnant: resuscitate mother first, left lateral tilt, fetal monitoring ≥4 h after viability, RhoGAM if Rh-neg

— Pediatric: hypotension is pre-arrest; weight-based dosing; screen for non-accidental trauma

— ICU for ongoing instability, ventilation, severe TBI, post-damage-control laparotomy

— Tertiary survey on Day 1–2 to catch missed injuries

— Discharge with VTE prophylaxis, multimodal analgesia (limit opioids), tetanus, SBIRT, trauma clinic and PCP follow-up at 1–2 weeks, PT/OT, PTSD screening at 1 and 3 months

Resuscitation rules:

Source control rules:

Special-population rules:

Disposition and follow-up rules:

Board pearl for the recap: When in doubt on Step 3, the answer in unstable trauma is almost always either "transfuse blood and call surgery" or "go to the OR" — never "additional imaging" in the genuinely unstable patient

CCS pearl: Final order before ending the case — explicit handoff documentation, follow-up appointments, return precautions, and family counseling — these graded soft skills separate passing from honors performance