Stages of Traumatic Shock
Traumatic shock develops as a result of massive mechanical injury (soft tissue crushing, limb avulsion, severe fractures), which is typically accompanied by acute blood loss and wound contamination. Its clinical course comprises two main phases:
- Compensation Stage (Erectile Phase). This is a period of emergency adaptation to hypoxia and blood loss, acting as a component of the general adaptation syndrome. There is a substantial surge in sympathoadrenal and adrenocortical activity. Clinically, the patient exhibits psychomotor agitation, dilated pupils (mydriasis), and pallor of the skin and mucous membranes due to the centralization of blood circulation. Hemodynamics are characterized by elevated blood pressure, tachycardia, rapid breathing (tachypnea), and increased blood flow velocity. Notably, the more massive the trauma, the shorter this stage lasts due to rapid depletion of physiological reserves.
- Decompensation Stage (Torpid Phase). This ensues when adaptive responses fail. The efficacy of neuroendocrine regulation progressively declines, and multi-organ dysfunction begins to manifest.
Hemodynamic and Systemic Disorders
The collapse of compensation triggers a cascade of life-threatening alterations in the body's internal environment:
- Cardiovascular System: Blood pressure drops precipitously, potentially leading to vascular collapse. The pulse becomes weak ("thready"), heart rate reaches 180–210 beats per minute, and arrhythmias with dropped pulse waves occur.
- Fluid and Electrolyte Balance: Massive fluid shifts occur from the intravascular space into the interstitial tissues. Hypovolemia develops, the circulating blood volume (CBV) drops critically, and hemoconcentration increases, reflected by an elevated hematocrit.
- Hemostatic System: Initial hypercoagulation and generalized microthrombosis in the microvasculature are replaced in later stages by disseminated intravascular coagulation (DIC) with activated fibrinolysis and hemorrhages.
- Blood Sequestration: Blood is pooled in the abdominal cavity, spleen, liver, and lungs. This reduces cardiac output and precipitates severe hypoxia.
Shock Organ Syndromes
Microcirculatory failure impacts all organ systems, establishing a vicious cycle. Without medical intervention, these abnormalities potentiate one another and result in death:
- Shock Lung Syndrome: Triggered by extreme stress. Excess catecholamines induce pre- and post-capillary vasospasm, increasing fluid filtration and causing pulmonary edema. Simultaneously, an imbalance of biologically active substances provokes bronchospasm and bronchiolar edema. The outcome includes airway obstruction, focal atelectasis, and acute respiratory failure (ARF).
- Shock Kidney Syndrome: Hypercatecholaminemia causes vascular spasm, ischemia, and nephron death. Systemic circulatory failure reduces glomerular filtration pressure. Sludge phenomena (sludge microcirculation) and microthrombi form, and casts obstruct the renal tubules. Hypoxia and toxemia directly damage the parenchyma, culminating in acute kidney injury (AKI) and uremia.
- Shock Liver and Gastrointestinal Tract: Hemodynamic disturbances cause total hepatic failure and splanchnic/mesenteric ischemia. Intestinal barrier dysfunction triggers autoinfection and autointoxication.
Specifics of Burn Shock and Coma
Burn shock occurs with extensive second- and third-degree burns. Its pathogenesis resembles that of traumatic shock but possesses specific features:
- A dominant and massive pain factor (intense afferent signaling from the burned area).
- Colossal plasma loss and significant bodily dehydration.
- Progressive and severe toxemia driven by tissue breakdown products.
- The erectile phase is extremely brief, while the torpid phase is severe and frequently complicated by wound infection, sepsis, and "shock kidneys."
The extreme degree of systemic depression caused by damaging agents can progress to coma (from Greek koma — deep sleep). It is characterized by profound depression of nervous system activity, prolonged loss of consciousness, hypo- or areflexia, and total failure of physiological systems.