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General Surgery · Additional Topics

Purulent-septic complications

Sepsis et complicationes purulento-septicae

Purulent-septic complications are severe pathological conditions developing as a result of infection dissemination from the primary focus into the bloodstream. They are accompanied by a systemic inflammatory response, microcirculatory disorders, and a high risk of multiple organ failure.

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Primary focusThe source is a local septic focus of infection.
DisseminationThe spread of microbes, toxins, and cytokines into the bloodstream.
SIRSSystemic inflammatory response syndrome due to vasodilation.
Shock organsDamage to the kidneys, lungs, and liver in septicemia.
2 min readFor medical studentsUpdated 10.10.2026
Material prepared by WhiteCoat Pro editorial team based on platform study guidesPending instructor review

Pathogenesis and development of systemic inflammation

The pathological process begins with the formation of a primary septic focus, from which infection, toxins, and pro-inflammatory cytokines enter the bloodstream. This leads to bacteremia and toxemia, and also activates cells of the immune system. Macrophages, monocytes, and endotheliocytes begin to produce endogenous mediators in excess, including interleukins and tumor necrosis factor.

Massive damage to the vascular endothelium triggers systemic inflammatory response syndrome (SIRS), accompanied by hypotension, hypovolemia, and tissue ischemia. Microcirculatory disorders cause organ hypoperfusion. Simultaneously, the coagulation cascade is activated, leading to DIC syndrome. Oxidative stress exacerbates the situation, causing tissue hypoxia and multiple organ failure.

Clinical and anatomical forms

Depending on the predominant manifestations and duration, the following main forms are distinguished:

  • Septicemia (sepsis): characterized by microcirculatory disorders, severe hemorrhagic syndrome, and the formation of "shock organs" (renal ischemia, multiple hemorrhages in the lungs, necrosis foci in the liver).
  • Septicopyemia: accompanied by the appearance of purulent-inflammatory foci in organs and tissues, such as brain or myocardium abscesses, purulent thrombophlebitis, and endocarditis.
  • Bacterial endocarditis and chronic sepsis.

Common morphological signs for all forms are anemia against the background of hematopoiesis depression, dystrophy of parenchymatous organs, and vasculitis with vascular wall necrosis.

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Classification by portal of entry

For early diagnosis and emergency prescription of antibacterial therapy, it is critically important to determine the source of infection. The following portals of entry are distinguished:

  1. Surgical (wound): the infection originates from a wound or the area of a removed purulent focus.
  2. Cutaneous: develops against the background of furuncles, abscesses, phlegmons, or infected wounds.
  3. Obstetric and gynecological: associated with pathology of the uterus and appendages after childbirth or abortions.
  4. Urogenital and otogenic: foci are localized, respectively, in the urinary tract or ear structures.
  5. Odontogenic and tonsillogenic: the source is located in the maxillofacial region or tonsils.
  6. Umbilical in newborns and cryptogenic, when the exact portal of entry cannot be established.
How to memorize

PDM-SIRS: Primary focus -> Dissemination -> Microcirculation impaired -> Systemic inflammatory response -> Shock organs.

Class and exam questions

What triggers the systemic inflammatory response syndrome?

SIRS occurs as a result of massive endothelial damage by toxins, vascular dilation, hypotension, hypovolemia, and tissue ischemia.

How does septicemia differ from septicopyemia morphologically?

In septicemia, microcirculatory disorders, hemorrhagic syndrome, and damage to "shock organs" predominate, whereas in septicopyemia, secondary purulent metastatic foci form in tissues and organs.

What is the clinical significance of classifying sepsis by its portal of entry?

It allows for timely identification of the source of infection and the prescription of empirical antibacterial therapy before the development of infectious-toxic shock.

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