DIC syndrome: catastrophe of the hemostatic system
DIC syndrome (disseminated intravascular coagulation syndrome) is a non-specific bodily response to severe obstetric complications. The core of the process lies in a gross disturbance of hemostasis and microcirculation. The final outcome is either massive hemorrhage or tissue hypoxia that disrupts the function of vital organs.
Key triggers of the syndrome:
- Damage to blood cells with the release of phospholipids.
- Tissue damage, causing tissue thromboplastin to enter the bloodstream.
- Vascular endothelial damage, which activates the Hageman factor (factor XII).
- Hemodynamic disorders (shock, hypoxia) and baseline hypercoagulation.
In obstetrics, DIC syndrome is most frequently triggered by severe preeclampsia, placental abruption, amniotic fluid embolism, fetal demise retained in utero, uterine rupture, congenital hemostatic defects, as well as septic or hemorrhagic shock.
Pathogenesis includes two parallel mechanisms:
- Consumption coagulopathy. Excess thromboplastin triggers the clotting cascade. A huge amount of thrombin and fibrin is formed, and the microvasculature becomes clogged with platelet-fibrin microclots. As a result, the reserves of clotting factors (especially fibrinogen, platelets, and factors III and V) are critically depleted.
- Pathological fibrinolysis. Anticoagulants and the fibrinolytic system are activated. The body begins to dissolve not only blood clots but also circulating clotting factors, which ultimately destroys the hemostatic potential.
Down syndrome and prenatal screening
Fetal chromosomal abnormalities, in particular Down syndrome, require timely prenatal screening. Diagnostics are based on maternal blood testing.
Main laboratory markers:
- Human chorionic gonadotropin (hCG) and its β-subunit. Quantitative determination in serum has high accuracy. In a physiological pregnancy, the concentration peak occurs at 10–11 weeks. Within the framework of the first-trimester screening (11–14 weeks), an elevated level of β-hCG is a reliable sign of Down syndrome.
- PAPP-A (Pregnancy Associated Plasma Protein-A). Produced by the syncytiotrophoblast starting from the 5th week. A decrease in its concentration at 11–14 weeks indicates a high risk of chromosomal pathology.
- Free (unconjugated) estriol. Produced by the fetoplacental complex. Its decrease at 16–18 weeks is also characteristic of Down syndrome (and anencephaly).
Infectious and pain syndromes
In addition to coagulopathies and genetic anomalies, specific infectious and pain syndromes are encountered in obstetric and gynecological practice.
Intoxication syndrome is prominently manifested in viral infections such as rubella. The disease is transmitted by airborne droplets and is accompanied by lymphadenopathy, exanthema, catarrhal changes in the oropharynx, and signs of scleritis. The main danger of rubella in obstetrics is the high risk of vertical transmission of the virus, which leads to severe congenital malformations of the fetus. The situation is aggravated by the fact that in adult patients, about 50% of cases occur in a mild (atypical) form, complicating diagnosis and the detection of CNS lesions.
Chronic pelvic pain syndrome (chronic pelvic pain) in women is often associated with pelvic vein insufficiency (pelvic vein incompetence). Modern methods of interventional radiology are actively used for the diagnosis and treatment of this pathology.
Instrumental diagnostics of syndromes
Magnetic resonance imaging (MRI) is used to clarify the causes of various pathological conditions and syndromes. The method is safe because it lacks ionizing radiation, and it is performed in the II–III trimesters of pregnancy.
MRI allows for:
- Evaluating fetal anatomy (excluding the heart) and clarifying the nature of malformations.
- Obtaining reliable data in cases of severe oligohydramnios, when ultrasound diagnostics is difficult.
- Confirming suspected placenta accreta.
- Accurately measuring the dimensions of the lesser pelvis. For example, detecting sacral flattening, which is an extremely unfavorable sign for vaginal delivery management.
For memorizing Down syndrome markers in the first trimester: hCG goes Up (elevated), while PAPP-A Drops (decreased).
Class and exam questions
What triggers consumption coagulopathy in DIC syndrome?
Massive entry of tissue thromboplastin into the bloodstream. This causes an avalanche-like formation of microclots and critical depletion of clotting factors (especially fibrinogen, platelets, and factors V and III).
At what gestational age is the PAPP-A level assessed to rule out chromosomal syndromes?
Screening is performed at 11–14 weeks of gestation. A reliable decrease in this protein indicates a high risk of fetal pathology.
Why are mild forms of rubella dangerous in pregnant women?
They significantly complicate the timely diagnosis of intoxication syndrome and exanthema. At the same time, the extremely high risk of vertical transmission of the virus and the development of severe congenital pathology in the fetus persists.
What else to study on this topic
- Uterine artery embolization for uterine fibroids
- The role of interventional radiology in postpartum hemorrhage
- Markers of neural tube defects (alpha-fetoprotein)
- Differential diagnosis of exanthematous infections in pregnant women
- Endovascular treatment of varicocele and prostatic hyperplasia
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