Orthonotes
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Types: hypovolemic (hemorrhagic), distributive (septic, neurogenic), cardiogenic, obstructive. Initial approach: ATLS (Airway with C‑spine, Breathing, Circulation, Disability, Exposure). Hemorrhagic shock is most common in trauma; control bleeding + balanced transfusion (1:1:1) + permissive hypotension until hemorrhage control (except TBI). Resuscitation targets: lactate clearance, base deficit, urine output, MAP appropriate to context. Adjuncts: TXA within 3 hours of injury; damage control surgery principles. Orthopaedic hemorrhage control: pelvic binder, traction for femoral shaft, external fixation, tourniquet in limb exsanguination. Endpoints: normalization of mentation, MAP, lactate/base deficit clearance, warm peripheries, adequate urine output.
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Shock is a life-threatening condition characterized by inadequate tissue perfusion resulting in cellular hypoxia and organ dysfunction. In orthopaedic trauma patients, shock most commonly results from hemorrhage associated with fractures, particularly long bone and pelvic fractures. Prompt recognition and resuscitation are critical to prevent multi-organ failure and death.
Orthopaedic surgeons frequently encounter shock in the context of trauma. Severe injuries such as femoral fractures, pelvic fractures, and multiple long bone injuries can result in significant blood loss. Early stabilization of fractures and aggressive resuscitation form the cornerstone of management.
Shock occurs when tissue oxygen delivery becomes inadequate to meet metabolic demands. Reduced perfusion leads to cellular hypoxia, anaerobic metabolism, and lactic acidosis. If untreated, this process results in progressive organ dysfunction.
Several physiological changes occur during shock:
These compensatory mechanisms initially maintain blood pressure, but persistent hypoperfusion eventually leads to irreversible shock.
Shock is classified based on its underlying mechanism.
| Type | Cause | Example |
|---|---|---|
| Hypovolemic | Loss of circulating blood volume | Hemorrhage |
| Cardiogenic | Failure of cardiac pump | Myocardial infarction |
| Distributive | Abnormal vasodilation | Septic shock |
| Obstructive | Mechanical obstruction of circulation | Pulmonary embolism |
In orthopaedic trauma, hypovolemic shock due to hemorrhage is the most common form encountered.
Significant hemorrhage can occur with certain fractures. Understanding the potential blood loss associated with each fracture helps clinicians anticipate shock.
| Fracture | Estimated Blood Loss |
|---|---|
| Femoral shaft fracture | 1000–1500 ml |
| Pelvic fracture | 2000–3000 ml |
| Tibial fracture | 500–1000 ml |
| Humeral fracture | 500 ml |
Pelvic fractures are particularly dangerous because they may cause massive retroperitoneal bleeding.
Clinical manifestations depend on the severity of shock and the amount of blood loss.
Early recognition is essential because patients may initially maintain normal blood pressure despite significant blood loss.
The Advanced Trauma Life Support (ATLS) system classifies hemorrhagic shock into four classes based on the amount of blood loss.
| Class | Blood Loss | Heart Rate | Blood Pressure |
|---|---|---|---|
| Class I | <15% | Normal | Normal |
| Class II | 15–30% | >100 | Normal |
| Class III | 30–40% | >120 | Reduced |
| Class IV | >40% | >140 | Severely reduced |
Management of shock in trauma patients follows the principles of Advanced Trauma Life Support (ATLS). The primary objective is restoration of circulating blood volume and tissue perfusion.
Two large bore intravenous cannulas should be inserted to facilitate rapid fluid administration.
Initial resuscitation typically begins with isotonic crystalloid solutions such as normal saline or Ringer lactate.
Early blood transfusion improves oxygen carrying capacity and prevents dilutional coagulopathy.
Early stabilization of fractures helps reduce pain, prevent further blood loss, and improve patient physiology.
Definitive fixation is performed once the patient becomes hemodynamically stable.
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