Early complications: acute blood loss and shock
Massive damage to large vessels or heart chambers leads to acute blood loss. The severity of the condition is determined by the volume of lost blood, the rate of bleeding, and the localization of the source.
Early complications are fundamentally based on hemorrhagic shock. A decrease in circulating blood volume (CBV) leads to a drop in venous pressure and cardiac output. The body triggers the compensation phase: the adrenal glands release catecholamines, which causes peripheral vasoconstriction and centralization of blood circulation. If the bleeding is not stopped, decompensation sets in: pulses in peripheral arteries disappear, blood pressure becomes unmeasurable, and oliguria or anuria develops. In the terminal stage, progressive tissue hypoxia and metabolic acidosis lead to multiple organ failure and DIC syndrome.
Important rule: in internal bleeding, the patient undergoes emergency surgery against the background of shock, since resuscitation from this state is impossible without surgical hemostasis.
Mechanical complications: compression and tamponade
Escaped blood can accumulate in closed cavities, causing critical organ compression:
- Cardiac tamponade. Occurs in hemopericardium. Blood compresses the myocardium, impairing its relaxation (diastolic filling). Cardiac output drops sharply, requiring immediate puncture or drainage of the pericardium.
- Respiratory failure. Characteristic of massive hemothorax, when blood compresses the lung tissue.
- CNS involvement. Intracerebral hematomas destroy and displace nervous tissue, compressing vital centers.
- Two-stage rupture. Characteristic of abdominal aortic aneurysm. The initial tear of the wall leads to collapse, after which the defect is temporarily sealed by a thrombus. With a subsequent surge in blood pressure, the thrombus is "knocked out", triggering a fatal recurrent hemorrhage.
Infectious consequences and chronic blood loss
Blood collections (hematomas, cavities) serve as an ideal nutrient medium for microorganisms. An aseptic effusion (e.g., hemopleuritis) easily becomes infected through damaged tissues, progressing to purulent empyema of the pleura. Late wound complications also include suppuration, tetanus, gas gangrene, and generalized purulent infection (sepsis).
Unlike acute loss, chronic bleeding (in ulcers, hemorrhoids, menorrhagia) occurs over a long period and in small amounts. It does not cause shock or hypovolemia, but leads to the depletion of iron stores. Chronic posthemorrhagic (iron deficiency) anemia develops, characterized by erythrocyte hypochromia and trophic changes in the skin and mucous membranes.
Complications in acute leukemias
Against the background of tumor expansion in leukemias, bleeding becomes severe. Specific complications develop:
- Vascular and neurological: leukemic thrombi, neuroleukemia, organ infarctions due to ischemia.
- Hemorrhagic and ulcerative-necrotic: profuse gastric and intestinal bleeding ("acute abdomen" clinical picture), severe DIC syndrome, breakdown of infiltrates.
- Septic: secondary infection superimposed on immunodeficiency, pneumonia, infectious-toxic shock.
Outcomes of hemorrhage
Favorable outcomes:
- Cessation of bleeding (vasospasm, thrombosis, or therapeutic hemostasis) followed by resorption of blood.
- Organization of the hematoma — ingrowth of connective tissue with the formation of a scar or capsule.
- Formation of a pseudocyst (e.g., gliomesodermal pseudocyst in the brain).
Unfavorable outcomes:
- Death from hemorrhagic shock or cardiac tamponade.
- Development of multiple organ failure due to tissue hypoxia.
- Suppuration of the hematoma or empyema of cavities.
- Death from acute renal or respiratory failure against the background of DIC syndrome.
To memorize the main causes of death in bleeding, use the acronym "S-A-T-I": Shock, Anemia (acute), Tamponade, Infection (sepsis).
Class and exam questions
Why is surgery not to be delayed in hemorrhagic shock from internal bleeding?
The sole cause of such shock is ongoing blood loss. Without surgical elimination of the source, infusion therapy is meaningless; therefore, surgery is initiated immediately without waiting for blood pressure stabilization.
What is the difference between anemia in acute and chronic blood loss?
Acute blood loss causes normochromic anemia with life-threatening hypovolemia. Chronic loss leads to hypochromic iron deficiency anemia with trophic tissue disorders without a sharp drop in blood volume.
What is a two-stage aneurysm rupture?
This is a condition where, after the initial rupture of the aorta, blood pressure drops and the opening is temporarily tamponaded by a thrombus. As soon as hemodynamics improve, the thrombus is washed away, leading to massive fatal bleeding.
What else to study on this topic
- Pathogenesis and stages of DIC syndrome in blood loss
- Mechanisms of circulatory centralization and the role of catecholamines
- Differences between hemothorax and pleural empyema: morphology and clinical features
- Methods of surgical and conservative hemostasis
- Morphogenesis of hematoma organization and pseudocyst formation
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