Thrombophlebitis

Basic terminology of venous pathologies

In surgical practice, it is critically important to distinguish between pathological processes occurring in the venous bed. These terms are often confused, but they describe fundamentally different conditions:

• Phlebitis (phlebitis) is an isolated inflammation of the venous wall. In this condition, intravascular blood clotting does not occur.
• Thrombophlebitis (thrombophlebitis) is a complex process involving both inflammation of the vein itself and simultaneous thrombus formation within its lumen.
• Phlebothrombosis (phlebothrombosis) is the formation of a thrombus inside a vessel that occurs without inflammatory changes in the venous wall.

Etiology and pathogenesis: Virchow's triad

A key point in the diagnosis and understanding of disease development is a thorough history taking. The physician must actively look for the factors making up the famous Virchow's triad. It is these three components that trigger the pathological cascade:

1. Slowing of blood flow (stasis). Occurs in conditions that restrict normal hemodynamics. These include prolonged patient immobility, heart failure, and pregnancy.
2. Alteration in blood composition (hypercoagulability). An increased tendency toward thrombosis can result from blood system disorders (e.g., in anemias or leukemias). In addition, hypercoagulability is provoked by certain medications: digitalis preparations, mercurial diuretics, vitamin K, glucocorticoids, and antibiotics (primarily penicillins).
3. Injury to the inner lining of the vessel (endothelium). Wall trauma can occur for many reasons. This includes mechanical trauma (fractures, bruises, hematomas, external compression) and immobilization. Iatrogenic causes play an important role, in particular, vascular catheterization. The endothelium is also damaged by infectious agents in acute and chronic infections (typhoid fever, pneumonia, influenza, septicemia).

Risk groups and triggering factors

The development of inflammation with thrombus formation is most frequently observed in certain categories of patients.

Special attention should be paid to patients after surgical interventions. Surgeries on the uterus, kidneys, and urinary tract carry the highest risk. Severe trauma is also a powerful triggering condition. A classic example is a femoral neck fracture, which statistically occurs more often in women and is associated with a high probability of vascular complications.

Class and exam questions

What else to study on this topic

• Mechanisms of venous stasis formation in heart failure
• The effect of penicillin antibiotics on the blood coagulation system
• Pathogenesis features of thrombosis after pelvic organ surgery
• Prevention of iatrogenic vein injuries during catheterization

Other topics from the section "CHAPTER 11. SURGICAL INFECTION (PURULENT-INFLAMMATORY DISEASES)"

Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.