Chest Trauma — Blunt & Penetrating: Lethal-Six Decompression, Tube Doctrine, Flail Fixation Boundaries and Hidden-Six Surveillance

Twenty-four-year-old motorcyclist, 70 km/h, left chest wall deformity with paradoxical movement, blood pressure 88/60, heart rate 128, distended neck veins, absent left breath sounds with tracheal shift right. Decompress now or image first? The examiner wants the tension criteria named, the decompression method with site and length by side, what the tube then has to prove, and which hidden-six lesions you will still be hunting an hour later. This page answers each with the number from the paper beside it.^{[4][5][6][34]}

Overview & Definition — two acts, twelve lesions

Chest trauma divides first by mechanism — blunt, penetrating, blast, iatrogenic — and then by tempo. Blunt injury constitutes the majority of chest trauma, and only 10 percent of thoracic trauma patients require surgical operation; the rest are managed with airway, oxygen, volume support and tube thoracostomy, with adequate pain control sometimes the most basic and best treatment.^[1] Thoracic trauma occurs in approximately 25 percent of all traumas, and one third of these patients present with pneumothorax, haemothorax or both — so the drain-or-observe decision is the commonest operative judgement in the specialty.^[3]

The classification that organises everything is the deadly dozen. The lethal six — airway obstruction, tension pneumothorax, cardiac tamponade, open pneumothorax, massive haemothorax and flail chest — are immediate, life-threatening injuries requiring evaluation and treatment during the primary survey. The hidden six — thoracic aortic disruption, tracheobronchial disruption, myocardial contusion, traumatic diaphragmatic tear, oesophageal disruption and pulmonary contusion — are potentially life-threatening injuries to be detected during the secondary survey.^[4] Penetrating trauma more likely requires surgical exploration than blunt, yet exploration remains rare at under 3 percent of traumas, with anterolateral thoracotomy the usual approach and clamshell or hemi-clamshell held for extension.^[11]

Epidemiology & Risk — who dies of the chest

Thoracic injury is a leading killer twice over. Physical trauma is the third most common cause of death in all age groups, and one in four trauma patients dies of thoracic injury or its complications.^[1] Among severe trauma patients, thoracic injuries are directly responsible for 20 to 30 percent of deaths and represent one of the main regions involved in preventable or potentially preventable deaths — the preventability is the examiner's justification for testing the primary-survey sequence so hard.^[2]

Death after blunt chest-wall trauma is predicted by four multipliers. Across 29 studies the combined mortality odds ratios were 1.98 for age 65 years or more, 2.02 for three or more rib fractures, 2.43 for pre-existing disease and 5.24 for pneumonia — pneumonia dominates, which is why every analgesia and fixation argument below is really a pneumonia argument.^[28] For blunt cardiac injury specifically, a single-year national analysis found 2,368 cases among 125,696 blunt thoracic admissions, with cardiac contusion the commonest type at 43 percent; age 65 or older, higher early transfusion requirement, motor-vehicle mechanism and concomitant thoracic injuries independently predicted contusion.^[38]

Age and elasticity reshape the same energy. In an Australasian cohort of patients 70 years or older with rib fractures, falls caused the majority at 50.2 percent and conservative management was used in 95 percent; operative patients carried more fractures and flail segments but similar complications with no deaths, so standard fixation indications apply and age alone does not disqualify.^[29] In children the elastic wall hides energy: isolated rib fractures occurred in only 5.8 percent of children versus 11 percent of adults, while children suffered higher rates of associated brain, pneumo-haemothorax, spleen and liver injury — a child's fractured rib marks greater transmitted force, not a minor injury.^[30]

Pathophysiology — pressure, paradox, tamponade, contusion

Tension kills by plumbing, not by hypoxia alone. A one-way valve accumulates pleural air, shifts the mediastinum, kinks venous return and collapses cardiac output; positive-pressure ventilation accelerates the spiral by raising intrathoracic pressure further — which is why the ventilated occult pneumothorax deserves its own consent conversation below.^[4][18] Decompression reverses the pressure first and diagnoses second; nothing about the definition requires a film before the needle or finger.^[4][9]

Flail kills through the bruise beneath the wall, not the wall's paradox. The flail segment's see-saw movement is the sign; the underlying pulmonary contusion with shunt, surfactant loss and oedema is the disease — management therefore targets the lung (oxygen, analgesia, physiotherapy, selective ventilation) while the wall is splinted by pain control or, in narrow indications, steel.^[20][21] Contusion physiology declares itself within hours, peaks with hypoxaemia and hypercarbia at about 72 hours, and usually resolves within approximately 7 days; thoracic CT is both highly sensitive for identifying contusion and highly predictive of the need for subsequent mechanical ventilation.^[31]

Tamponade after trauma is a compliance catastrophe. Blood in a stiff pericardium abolishes diastolic filling within tens of millilitres; fluids transiently raise venous pressure to defend filling but buy minutes, and the goals of emergency thoracotomy name the definitive answers — treat tamponade, control haemorrhage, manage air embolism, massage the heart and occlude the aorta.^[43] Non-operative thoracic bleeding control meanwhile depends on finding the source fast: extended FAST identifies intrathoracic bleeding much more quickly and determines the therapeutic strategy, with sources spanning diaphragm, great vessels and venae cavae, lung, heart and chest wall.^[2]

Presentation — criteria before catheters

Tension presents as a syndrome, and prehospital decompression without the syndrome injures. In a 115-patient level-1 series, 85 patients undergoing prehospital needle decompression did not meet at least one clinical criterion; a quarter sustained an iatrogenic pneumothorax from the procedure, 6 percent were admitted because of the procedure itself, and two vascular injuries required emergency operative repair.^[7] State the criteria — hypotension with a pleural cause, respiratory distress, diminished breath sounds with a compatible mechanism — and then decompress without delay, because restricted-to-urgent-cases plus executed-without-delay is the whole prehospital doctrine.^[9]

Suspect tracheobronchial injury by its triad: subcutaneous emphysema, pneumomediastinum and pneumothorax, especially a pneumothorax that persists despite a functioning drain. Most traumatic or iatrogenic injuries occur within 2.5 cm of the carina or main bronchus, and chest CT plus bronchoscopy are the paired examinations that map site and condition before repair planning.^[46] Suspect aortic injury by mechanism — high-speed deceleration — with mediastinal signs as the trigger for gated CT angiography, and suspect diaphragm injury whenever force crosses the thoracoabdominal boundary even when the first scan is reassuring.^[44][45]

Missed Injuries & Differential — the hidden six stay hidden without a hunt

The secondary survey exists because six lesions survive the primary one. Aortic disruption, tracheobronchial disruption, myocardial contusion, diaphragmatic tear, oesophageal disruption and pulmonary contusion each present as immediately or potentially life-threatening events demanding detection after the lethal six are handled.^[4] The hypotensive chest therefore keeps a running differential — tension, tamponade, massive haemothorax, spinal shock, intra-abdominal bleeding — re-split after every intervention rather than closed after the first tube.^[2]

The diaphragm is the most structurally missed: injuries are rarely seen and difficult to diagnose, CT has improved but increasing non-operative management has increased the missed rate, and delayed herniation with obstruction or perforation carries mortality as high as 85 percent — when diagnosed, injuries should be repaired to reduce future complications.^[45] The oesophagus is the most cognitively missed: uncommon, mimicking infarction, morbid when late — name it in every mediastinal-air differential and cross-link to the definitive upper-gastrointestinal pathway rather than inventing numbers this topic does not own.^[4]

Scoring — TTS for prognosis, volume for lungs, STUMBL for walls

Only one thoracic score independently predicts death. Among 278 multiply injured patients with severe blunt chest trauma, 21.6 percent developed ARDS, 51.4 percent SIRS, 39.6 percent sepsis, 13.0 percent multiorgan dysfunction and 7.9 percent died — and among chest AIS, contusion, Wagner and Thoracic Trauma Severity scores, only the TTS independently predicted mortality, with anatomy-plus-physiology scores suiting severity assessment best.^[33]

Contusion volume on admission CT converts anatomy into prognosis. In 49 patients with measured three-dimensional contusion volumes averaging 18 percent of lung, severe contusion at or above 20 percent carried ARDS in 82 percent versus 22 percent below — quote the 20-percent line as the high-risk identifier, not as an operative trigger.^[32] For rib fractures, four risk-stratification tools were identified with the Study of the Management of Blunt Chest Wall Trauma score most predictive — use it to select for bundles and monitored beds.^[26] For occult pneumothorax, physiology beats anatomy: subcutaneous emphysema at odds ratio 20.10 and mechanical ventilation at 17.30 were the strongest independent predictors of deterioration, in a model discriminating at AUC 0.97.^[19]

Tension & Decompression — needle bridges, fingers confirm, tubes definitive

Needle decompression fails radiologically in a third of attempts. Across 24 studies and 8,046 patients the failure rate for needle penetration into the pleural cavity was 32.84 percent, each added centimetre of length cutting failure by 7.76 percent — length reaches pleura, and standard intravenous catheters frequently do not, since the pleural cavity cannot be reached in a considerable percentage of patients with the usual 14-gauge catheter.^[5][9] The needle is therefore quick, underequipped and temporary by design: a bridge to definitive drainage, never the destination.^[9]

Site follows thickness and side. Chest wall at the 5th anterior and midaxillary lines runs thinner than at the 2nd midclavicular line, favouring the lateral approach — yet injury rates run higher at the anterior axillary line with length-injury correlations near 0.9, and the meta-analysis concludes a 7 cm needle suits right-sided tension at either the 5th intercostal midaxillary or 2nd intercostal midclavicular position, while for left-sided cases the 2nd midclavicular line is safer given cardiac risk.^[5] The cardiac warning is quantitative: with an 83-mm catheter recommended at the 5th ICS anterior axillary line, the skin-to-pericardium distance in 75 percent of young adults falls within the catheter's length — hubbing it risks the heart.^[6]

Fingers beat needles where skills allow. In 103 helicopter-EMS cases with 179 finger thoracostomies — three-quarters bilateral, median ISS 41, over half motor-vehicle — only three potential complications were attributed to the procedure, and the authors conclude finger thoracostomy should be the preferred decompression approach given needle deficiencies.^[8] The operative detail that makes it safe is explicit: blunt dissection, a finger clearly identifying the pleural space, never a trocar, staying above the mammillary level to spare intra-abdominal organs.^[9] In the ventilated arrest, simply opening the pleural membrane without a tube can suffice as the immediate act.^[9]

Pneumothorax — size it, then choose

Haemodynamically abnormal patients require expeditious tube thoracostomy drainage; in the stable patient, imaging sizes the decision.^[3] A pneumothorax greater than 20 percent of thoracic volume on film, or greater than 35 mm radially on CT, should be drained; smaller ones may be observed with roughly 10 percent failing observation to later drainage.^[3] CT-measured haemothorax above 300 mL by the Mergo formula should likewise be drained rather than watched.^[3]

Occult pneumothorax — visible on CT, invisible on film — is safely observed in the stable, with priced exceptions. In a 90-patient multicentre RCT of ventilated trauma patients, respiratory distress risk was similar between observation and drainage at relative risk 0.71, with no mortality or stay difference; but 20 percent of observed patients needed later drainage, drainage carried 15 percent complications plus 15 percent malposition, and one observed ventilated patient (2 percent) developed tension, rescued by urgent tube without sequelae.^[18] The selection rule is therefore physiological: of 166 blunt occult pneumothoraces only 10.2 percent needed delayed drainage, predicted by subcutaneous emphysema and mechanical ventilation — observe the calm chest, drain the emphysematous or ventilated one, and consent the ventilated observed patient for the 2-percent tension explicitly.^[19][18]

Haemothorax — drain smart, irrigate, watch the retained

Immediate tube drainage for the unstable chest is not debated; everything after is technique. EAST conditionally recommends pigtail catheters in haemodynamically stable patients — small-bore practice now has meta-analytic backing: across 1,847 patients, failure (retained blood needing re-intervention) was 17.8 percent for 14-French-or-smaller versus 21.5 percent for 20-French-or-larger, statistically indistinguishable, with fewer tube days at 4.3 versus 6.2 — small may be as effective as large.^[12][13] Small and pigtail practice for haemothorax, once heresy against large-bore routine, now shows good performance in contemporary series.^[11]

Two adjuncts change outcomes at placement. Thoracic irrigation with warm sterile saline at tube insertion decreases secondary interventions such as added tubes or surgery.^[3] The multicentre test across 11 sites and 462 haemothoraces found secondary intervention in 8 percent of irrigated versus 13 percent of non-irrigated hemithoraces, with propensity-weighted odds ratio 0.56 — irrigation cuts the odds of re-intervention by 44 percent.^[14] Presumptive antibiotics before tube placement are recommended, and the meta-analysis splits the benefit by mechanism: overall infectious complications at odds ratio 0.6 with empyema at 0.35, protective in penetrating injury against both empyema (0.14) and pneumonia (0.24), with no protective effect in blunt trauma against either.^[3][15] After large-tube insertion the reviewed prophylaxis duration is 24 hours.^[10]

Theatre thresholds are volumetric. Surgical exploration by VATS or thoracotomy is necessary beyond 1,500 mL accumulated or ongoing loss above 200 mL per hour; lesser bleeding is evacuated by tube with investigation of cause, retained clot may meet fibrinolytics, and persistent failure goes to VATS or thoracotomy to prevent empyema and entrapment.^[10] Retained haemothorax — blood persisting after tube — carries empyema in 26.8 percent and pneumonia in 19.5 percent, with a quarter of patients needing two or more procedures and thoracotomy ultimately required in 20.4 percent.^[16] EAST conditionally recommends VATS over thrombolytics for retained blood, performed early at or before 4 days.^[12] The timing study behind early agrees: 73.4 percent complete evacuation success with best results when drainage precedes the fifth day.^[17] Observation succeeds chiefly for small retains — estimated volume at or below 300 cc predicted successful observation at odds ratio 3.7 — while diaphragm injury, volumes above 900 cc and omitted periprocedural antibiotics predict thoracotomy.^[16]

Flail Chest & Pulmonary Contusion — the EAST doctrine with trial pricing

EAST's flail-contusion guideline runs six Level-2 and eight Level-3 recommendations around restraint. Patients should not be excessively fluid restricted but resuscitated to perfusion endpoints; obligatory ventilation without respiratory failure is avoided; optimal analgesia with aggressive physiotherapy minimises respiratory failure; epidural catheter is the preferred analgesia mode in severe flail; steroids have no place in contusion therapy; and fixation may be considered for severe flail failing ventilator weaning or when thoracotomy is needed for other reasons.^[20] Mask CPAP earns a trial in the alert marginal patient, ventilated patients separate from the machine at the earliest opportunity, and multidisciplinary chest-wall protocols should be considered where feasible.^[20]

The natural history without fixation is sobering. Among 3,467 flail patients nationally — mean age 52.5, 77 percent male, over half with lung contusion — 59 percent needed ventilation for a mean 12.1 days, 82 percent needed ICU for 11.7 days, and complications ran pneumonia 21 percent, ARDS 14 percent, sepsis 7 percent and death 16 percent; epidurals reached only 8 percent and fixation 0.7 percent, with over 99 percent treated non-operatively.^[21] Two randomised trials price fixation's benefit in true flail: polytrauma flail fixation cut ventilation from 9 to 7 days and ICU from 12 to 10 days, with ARDS 28 versus 60 percent and pneumonia 48 versus 80 percent — though ventilatory benefit vanished in the contused subgroup.^[22] The earlier Marasco trial cut post-randomisation ICU from 359 to 285 hours and post-extubation noninvasive ventilation from 50 to 3 hours, with no spirometry or quality-of-life difference at follow-up.^[23] Pooled across 11 studies and 753 patients, fixation cut ventilator days by a mean 8, pneumonia odds to 0.2, ICU days by 5, mortality odds to 0.31 and tracheostomy odds to 0.06 — on a base the authors flag as mostly small retrospective studies still needing prospective trials.^[24]

The boundary trial is stated, not buried. Randomising 84 severe chest-wall injuries without clinical flail — radiographic flail, five or more consecutive fractures, or bicortical displacement — fixation increased hospital stay at rate ratio 1.48 with similar ICU and ventilator days and no quality-of-life benefit to 6 months.^[25] The viva line: fix the flail chest that cannot wean, do not fix the injured wall to shorten a stay that fixation lengthens.^[20][25]

Rib Fractures & Analgesia — bundles, blocks and who is watched

Analgesia is treatment, not comfort. Multidisciplinary bundles with protocolised multimodal analgesia decrease morbidity and mortality after rib fractures; the STUMBL score leads the four identified risk tools as most predictive, while most pathways otherwise predict mortality poorly.^[26] Regional options span thoracic epidural, paravertebral, erector-spinae-plane and serratus-anterior-plane blocks alongside systemic multimodals from paracetamol through ketamine and lidocaine infusions.^[26] EAST already prefers epidural catheters in severe flail, accepting paravertebral as equivalent where epidural is contraindicated.^[20]

The serratus block now has randomised backing. In the 210-patient SABRE trial across eight emergency departments, adding SAPB to protocolised bundles lifted the composite early pain outcome from 19.6 to 41 percent and halved 24-hour opioid need from 91 to 45 milligram morphine equivalents, with pneumonia, stay and mortality similar between groups.^[27] The elderly majority-conservative practice above and the paediatric high-energy marker complete the disposition logic: admit and bundle the old faller, image generously the child with a broken rib.^[29][30]

Blunt Cardiac Injury — rule out with two tests, never one

EAST's screening guideline changed practice: ECG alone is insufficient, and blunt cardiac injury can be ruled out only if both the admission ECG and troponin I are normal — the combination reaching 100 percent negative predictive value across four studies.^[34] New ECG changes or elevated troponin earn monitored admission; echocardiography is not a screening tool and is reserved for hypotension or arrhythmia; sternal fracture alone does not predict injury; and cardiac CT or MRI separates infarction from contusion when both threaten.^[34] Contusion diagnosed means 24 to 48 hours of monitored observation for arrhythmia, since significant injury beyond contusion usually needs surgery.^[35] The benign counterpart is explicit: mild or no symptoms with a normal ECG and haemodynamic stability typically means a benign course rarely needing further testing or prolonged observation.^[36]

Sternal fracture deserves de-escalation with one exception. In the pan-scan era, 2.0 percent of 14,553 imaged blunt patients had sternal fracture with 94 percent visible on CT only, cardiac contusion diagnosed in 2.4 percent, mortality 3.8 percent versus 3.1 percent without fracture, and only 0.7 percent of deaths cardiac — most fractures are clinically insignificant and routine contusion workup is low-yield.^[39] The exception is the combined fracture: among 380 sternal-fracture patients, blunt cardiac injury was diagnosed in 5 percent, all with combined rather than isolated fractures, with pulmonary co-injuries the significant multivariable predictor — triple testing (ECG, enzymes, echo) belongs to combined fractures with pulmonary injury, not to the isolated crack.^[37] Nationally, death among cardiac-injury patients concentrates with age 65-plus, aortic or diaphragmatic injury, haemothorax and heart-failure history.^[38]

Aortic Injury — TEVAR first, grade II watched

The Society for Vascular Surgery guideline rests on 7,768 patients across 139 studies: mortality 9 percent for endovascular repair, 19 percent for open repair and 46 percent for non-operative management — endovascular repair is suggested over open or none for transection, with less cord ischaemia, renal injury and graft or systemic infection.^[40] Committee judgement adds timing and restraint: urgent repair after stabilisation of competing injuries, observation of minimal aortic defects, selective left-subclavian revascularisation, and no routine spinal drainage.^[40]

Grade II injury — intramural haematoma with or without contour abnormality — is the surveillance lane. Across 13 studies and 204 non-operatively managed grade-II injuries, all-cause mortality was 10.4 percent but aorta-related mortality only 2.9 percent with early aortic intervention in 3.3 percent — death comes from multisystem trauma, not the aorta, supporting non-operative management with imaging surveillance while longer-term aortic effects stay unknown.^[41]

Diaphragm & Airway — repair on sight, scope the carina

Acute diaphragmatic injury is repaired through the abdomen: midline laparotomy is advocated because it diagnoses and treats the frequent associated intra-abdominal injuries, with nonabsorbable simple sutures adequate in most cases and mesh reserved for chronic and large defects; outcomes track the Injury Severity Score of the concomitant injuries.^[44] The stable penetrating left thoracoabdominal wound earns thoracoscopy or laparoscopy for diagnosis and repair of the missed injury, given very high diaphragmatic incidence in that trajectory.^[44] The abdominal-trauma topic owns the peritoneal-breach and hollow-viscus half of this boundary — cross-reference it rather than re-deriving selection clocks here.^[45]

Resuscitation & Thoracotomy — brief, because the numbers live next door

There is no debate that the unstable chest gets a tube before a film, and that ratios, permissive pressure, tranexamic timing and massive-transfusion triggers are owned by the damage-control resuscitation and massive-transfusion topics — resuscitate by those protocols while the chest declares itself.^[1] Resuscitative thoracotomy is priced honestly: 7,236 patients across 45 years with 7.8 percent survival, best in penetrating trauma with witnessed arrest and signs of life at the centre — reserved for acute resuscitation of selected dying patients after weighing futility, cost and benefit.^[42] Ventilator doctrine for the contused lung that progresses to ARDS lives in the ARDS topic; this topic owns only the trauma-side numbers — 72-hour peak, 7-day course, the 20-percent ARDS line.^[31][32]

Evidence, Guidelines & Regional Differences — who proved what

EAST owns three guidelines quoted above with their numbers: flail-contusion restraint with epidural-first analgesia, ECG-plus-troponin cardiac screening, and conditional pigtails with early VATS for retained blood.^[20][34][12] SVS owns aortic injury with the 9/19/46 ladder, extended by the 2024 grade-II surveillance meta-analysis.^[40][41] The Western Trauma Association owns irrigation at placement across 11 sites; AAST owns retained-blood observation thresholds across 20 centres.^[14][16] Meta-analyses own fixation benefit and the penetrating-only antibiotic split; the single-centre and retrospective bases behind several recommendations are stated where the papers state them.^[24][15] ATLS and the European Trauma Course diverge on needle size and site — the meta-analysis above prices the choice rather than resolving the tribal dispute.^[5] ANZ practice contributes the finger-thoracostomy retrieval series, the SABRE serratus trial and the elderly rib cohort; UK NEXUS data de-escalate sternal workup; the global South and pan-scan era both appear with their own numbers.^{[8][27][29][39]}

Exam Pearls — the one-liners that score

• Lethal six in primary, hidden six in secondary — name the act before the lesion.^[4]
• Needles fail radiologically in 32.84 percent and each centimetre buys 7.76 percent — bridge, then drain.^[5]
• Left-sided tension prefers the 2nd midclavicular line; hubbing 83 mm at the left 5th anterior axillary line risks the heart.^[5][6]
• Freelance prehospital decompression without criteria bought 25 percent iatrogenic pneumothorax and two vascular repairs.^[7]
• Fingers confirm pleura without trocars above the nipple line; 179 procedures, three potential complications.^[8][9]
• Drain beyond 20 percent or 35 mm; observe below with a 10-percent failure quote; drain haemothorax beyond 300 mL.^[3]
• Small drains match large for blood at 17.8 versus 21.5 percent failure with fewer tube days.^[13]
• Irrigate at placement and cut re-intervention odds nearly in half at 0.56.^[14]
• Antibiotics protect penetrating chests (empyema 0.14) and not blunt ones — give by mechanism.^[15]
• Retained blood at or below 300 cc observes at OR 3.7; beyond it goes early to VATS before day five.^[16][17]
• Observed occult pneumothorax fails in a fifth and tensions in one in fifty ventilated — watch the emphysematous and ventilated.^[18][19]
• No obligatory ventilation, epidural first, no steroids, fix the unweanable flail.^[20]
• Flail kills 16 percent nationally with a fifth pneumonic — fixation cut ventilation and ARDS in true flail.^[21][22]
• Beyond flail, fixation lengthened stay at RR 1.48 with no quality-of-life gain — state the boundary.^[25]
• ECG plus troponin both normal rules out; either abnormal admits; echo is for hypotension or arrhythmia.^[34]
• Contusion means 24 to 48 monitored hours; severe volume at or above 20 percent means ARDS in four of five.^[35][32]
• TEVAR 9 percent beats open 19 and none 46; grade II watches at 2.9 percent aortic death.^[40][41]
• EDRT survives 7.8 percent — offer it to the witnessed penetrating arrest, counsel everything else.^[42]
• Missed diaphragm strangulates at up to 85 percent mortality — repair on sight with nonabsorbable suture.^[45][44]
• TBI triad is emphysema, pneumomediastinum and persistent pneumothorax within 2.5 cm of the carina — CT plus bronchoscopy.^[46]

Revision summary

Two acts, twelve lesions. Decompress tension on clinical criteria with side-aware site and length, drain by size thresholds, use small tubes with irrigation and mechanism-matched antibiotics, clear retained blood early by VATS, ventilate contusion selectively with epidural-first analgesia, fix only the flail that will not wean, rule the heart out with ECG plus troponin, stent transections urgently and watch grade-II aortas, repair diaphragms on sight and scope suspected airways. Every number above belongs to the paper cited beside it — quote the paper, not this page, at the viva.^{[4][12][20][34][40]}