Damage Control Surgery: Principles and Indications

Definition / Overview

Damage control surgery (DCS) is a staged operative strategy in which the initial operation is deliberately abbreviated to address only immediately life-threatening haemorrhage and contamination, followed by physiological resuscitation in the intensive care unit, with definitive anatomical reconstruction deferred to a planned re-look procedure once physiology has been restored.

• The concept emerged from management of severe hepatic and abdominal vascular trauma but has expanded to encompass thoracic, orthopaedic, and vascular injury patterns
• The fundamental premise is that physiological survival takes precedence over anatomical repair at the index operation
• DCS is not a strategy for every trauma patient - inappropriate application increases morbidity from complications of open abdomens, abdominal compartment syndrome, and unnecessarily deferred definitive care

Pathophysiology - The Lethal Triad

The physiological derangement driving the DCS decision is the lethal triad (also termed the "bloody vicious cycle"):

$$\text{Hypothermia} + \text{Acidosis} + \text{Coagulopathy}$$

Each element potentiates the other two, creating a self-reinforcing spiral toward death if uninterrupted by physiological rescue.

Hypothermia

• Core temperature $< 35^\circ\text{C}$ impairs enzymatic coagulation cascade function
• Temperatures $< 32^\circ\text{C}$ are associated with refractory coagulopathy and fatal arrhythmias
• Prolonged laparotomy with open body cavities, cold fluid resuscitation, and anaesthetic vasodilation all compound heat loss

Metabolic Acidosis

• Haemorrhagic shock produces lactic acidosis from tissue hypoperfusion ($\text{pH} < 7.2$ is a critical threshold)
• Acidosis reduces myocardial contractility and reduces the efficacy of vasopressors
• Coagulation enzyme activity falls sharply below $\text{pH}\,7.2$

Coagulopathy

• Dilutional coagulopathy from large-volume crystalloid resuscitation
• Consumptive coagulopathy from massive haemorrhage and release of tissue factor
• Fibrinolysis activation compounds the picture
• Recognised early as acute traumatic coagulopathy (ATC), which begins at the time of injury, not as a consequence of resuscitation alone

Indications for Damage Control Surgery

The decision to pursue DCS must be made early, ideally before the patient reaches physiological extremis. A combination of anatomical complexity, physiological deterioration, and resource context should inform the decision.

Physiological Triggers

Anatomical / Injury-Based Triggers

• Major vascular injury requiring complex reconstruction (aorta, IVC, mesenteric vessels)
• Multiple visceral injuries necessitating lengthy definitive repair at index operation
• Major hepatic injury requiring packing
• Combined thoracoabdominal injury
• Retroperitoneal haematoma with ongoing expansion after exploration
• Inability to achieve fascial closure due to visceral oedema or haemostatic packing

Resource and Contextual Triggers

• Operating at a centre without specialist vascular or hepatobiliary capabilities - temporising and transferring is a form of damage control
• Depletion of blood bank resources in an austere or mass-casualty environment
• Surgeon recognition that continuing the procedure exceeds current technical resources

The Three Phases of Damage Control Surgery

Phase I - Abbreviated Index Operation (Operative Damage Control)

The goal is to achieve haemorrhage control and limit contamination within 60-90 minutes. Anatomical restoration is explicitly not attempted.

Haemorrhage control techniques: 1. Manual compression and packing as the immediate first response on entering the abdomen 2. Perihepatic packing for liver injuries - packs placed to compress between the liver and the diaphragm/anterior abdominal wall 3. Aortic compression at the hiatus or supra-coeliac clamping for proximal haemorrhage control 4. Vessel ligation of non-critical vessels where technically feasible 5. Temporary intravascular shunting for major named vessels (iliac, femoral, SMA, popliteal) when reconstruction is deferred - shunts maintain distal perfusion for 12-48 hours 6. Topical haemostatic agents (oxidised cellulose, fibrin sealants) for diffuse ooze 7. Endovascular adjuncts: REBOA (Resuscitative Endovascular Balloon Occlusion of the Aorta) as a bridge to haemorrhage control in select centres

Contamination control techniques: - Hollow viscus injuries stapled, tied, or rapidly oversewn without formal anastomosis - Bowel ends left in discontinuity (not reconstructed at index operation) - Gross contamination irrigated with warm saline - Damaged or devascularised bowel resected but not anastomosed

Temporary abdominal closure (TAC): - Fascial closure is frequently not possible or not safe - Options include: - Bogotá bag (sterile IV bag sutured to skin) - Commercial negative pressure wound therapy (VAC) systems - preferred in most centres due to controlled effluent management and reduced fascial retraction - Wittmann patch (hook-and-loop system allowing sequential fascial approximation) - Goal: protect viscera, allow decompression of intra-abdominal hypertension, facilitate re-look

Phase II - ICU Resuscitation

The most critical and often underappreciated phase. Surgical restraint is required - reoperation must be resisted until physiology is restored.

Targets for resuscitation before re-look: - Core temperature $> 36^\circ\text{C}$ - $\text{pH} > 7.35$ - Lactate $< 2.5\,\text{mmol/L}$ or clearance $> 10\%$/hour - INR $< 1.5$, fibrinogen $> 1.5\,\text{g/L}$, platelets $> 50 \times 10^9/\text{L}$ - Urine output $> 0.5\,\text{mL/kg/hr}$ - Vasopressor requirements trending down

Damage control resuscitation (DCR) principles in Phase II: - Permissive hypotension until definitive haemorrhage control is achieved ($\text{SBP}\,80$-$90\,\text{mmHg}$ in haemorrhagic shock without TBI; target $\text{SBP}\geq 90$ if concurrent TBI) - Minimise crystalloid - crystalloid exacerbates dilutional coagulopathy and visceral oedema - Balanced blood product resuscitation: packed red cells: fresh frozen plasma: platelets in a 1:1:1 ratio - Cryoprecipitate for fibrinogen replacement (target fibrinogen $> 1.5$-$2.0\,\text{g/L}$) - Tranexamic acid $1\,\text{g}$ IV over 10 minutes then $1\,\text{g}$ over 8 hours, given within 3 hours of injury - reduces mortality from haemorrhage without increased thromboembolic risk in this window - Massive transfusion protocol (MTP) activation - early and structured - Warming: warm IV fluids, forced-air warming blankets, humidified ventilator circuits, warm irrigation at re-look - Correct ionised calcium (calcium gluconate $10\,\text{mL of }10\%$ solution IV or calcium chloride $5$-$10\,\text{mL of }10\%$ IV) - citrate in blood products chelates calcium

ICU monitoring: - Intra-abdominal pressure monitoring via bladder catheter - target $< 20\,\text{mmHg}$; values $> 20\,\text{mmHg}$ with new organ dysfunction define abdominal compartment syndrome (ACS) requiring decompressive laparotomy - Repeat lactate every 2-4 hours to guide resuscitation adequacy - Thromboelastography (TEG) or rotational thromboelastometry (ROTEM) to guide targeted blood product therapy

Phase III - Planned Re-look and Definitive Repair

Typically undertaken at 24-72 hours after Phase I, once physiological targets are achieved. Premature return to theatre before normalisation of physiology will reproduce the lethal triad.

Re-look priorities: 1. Remove packs - reassess haemostasis and address any residual bleeding 2. Assess bowel viability - resect additional non-viable segments 3. Restore gastrointestinal continuity where safe (anastomosis or stoma formation) 4. Repair remaining visceral injuries (biliary, urological, diaphragmatic) 5. Vascular reconstruction - convert temporary shunts to definitive repair 6. Washout of peritoneal contamination 7. Achieve definitive fascial closure where possible - aim for primary fascial closure by 72 hours if feasible; rates of successful closure fall significantly beyond 7-10 days

Damage Control in Specific Anatomical Regions

Damage Control Orthopaedics (DCO)

• In polytrauma patients, early definitive fixation of long bone fractures (especially femur) can precipitate an immunological and inflammatory 'second hit' that drives ARDS and MODS
• DCO principle: apply external fixators rapidly to restore skeletal stability, avoid lengthy intramedullary nailing at the index presentation
• Definitive fixation deferred until the peritraumatic immunological storm has subsided (typically 3-7 days)
• Open fractures require early wound debridement, lavage, antibiotic cover, and temporary stabilisation regardless of DCO versus definitive approach

Damage Control for Vascular Trauma

• Temporary intraluminal shunts (e.g., Argyle or Javid shunts, or improvised with IV tubing) restore distal perfusion while definitive repair is deferred
• Allows transfer to a vascular-capable centre or return after physiological resuscitation
• Fasciotomy of the affected compartment should be performed prophylactically when ischaemia time exceeds 4-6 hours or there is significant soft tissue injury

Damage Control Thoracic Surgery

• Emergency thoracotomy (resuscitative or operative) follows similar principles
• Pulmonary tractotomy rather than formal lobectomy for penetrating lung injury
• Hilar clamping for uncontrolled pulmonary haemorrhage
• Cardiac injuries: digital occlusion, Foley catheter tamponade, or stapled repair as temporising measures before formal repair

Complications and Special Considerations

Open Abdomen Complications

• Enteroatmospheric fistula (EAF): the most feared complication; incidence increases with prolonged open abdomen; meticulous handling of bowel, avoidance of unnecessary bowel manipulation, and timely closure reduce risk
• Abdominal compartment syndrome: may develop even with open abdomen if packs excessive; monitor bladder pressure regularly
• Fascial loss: prolonged open abdomen leads to fascial retraction and loss; planned component separation or biological mesh may be required for delayed closure
• Septic complications: peritonitis, wound infection, anastomotic dehiscence at re-look if bowel anastomosis was undertaken prematurely

Avoiding Inappropriate Application of DCS

• DCS carries its own morbidity - open abdomen, multiple returns to theatre, ICU complications, fistula formation
• Stable patients with contained injuries should undergo definitive repair at index operation
• Avoid DCS purely for surgeon convenience or inexperience with complex repair
• Evidence suggests DCS has been over-applied; careful patient selection is essential

Coagulopathy Management - Targeted Therapy

• TEG/ROTEM-guided resuscitation allows targeted product use rather than empirical 1:1:1
• Clot amplitude (MA on TEG): low amplitude → platelet/fibrinogen deficiency → cryoprecipitate and platelet transfusion
• Clot formation rate (K and angle): impaired → fibrinogen deficiency → FFP and cryoprecipitate
• Fibrinolysis (LY30): elevated → antifibrinolytic therapy (tranexamic acid, if not already given)

Perioperative Management Considerations

Pre-operative Phase

• Activate MTP early - do not wait for laboratory confirmation of coagulopathy
• Communicate DCS intent clearly with anaesthetics team, scrub team, and ICU before incision
• Warm theatre environment, warm fluids, cell salvage where contamination is absent
• REBOA insertion (Zone I for abdominal haemorrhage, Zone III for pelvic haemorrhage) at centres with capability

Intraoperative Phase

• Assign a dedicated team member to monitor operative time - aim to complete Phase I within 60-90 minutes
• Regular communication with anaesthetist regarding temperature, pH, haemoglobin, and product use
• Avoid unnecessary dissection - control, pack, and close
• Do not attempt anastomoses or complex reconstructions if any element of the lethal triad is present

Postoperative / ICU Phase

• Daily reassessment of physiology before deciding timing of re-look
• Nutrition: early enteral nutrition via nasogastric/post-pyloric tube as tolerated with open abdomen - reduces gut mucosal breakdown and bacterial translocation
• DVT prophylaxis: mechanical (sequential compression devices) immediately; pharmacological (low molecular weight heparin) deferred until haemostasis is confirmed, typically 24-48 hours post-haemostasis
• Involve critical care, haematology, nephrology (for AKI), and respiratory teams early

Long-term Considerations

• Ventral hernia is the commonest long-term sequela of open abdomen management - counsel patient and plan elective repair at 6-12 months once physiological recovery and nutrition are optimised
• Psychological impact of ICU stay and prolonged recovery - early liaison psychiatry and rehabilitation input improves outcomes

Summary: Key Decision Points for the Viva