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Introduction

SARS-CoV-2 infection causes thrombosis in patients, and pregnant women have a physiological hypercoagulability, the association of the infection producing an increased risk.

Thrombocytosis is a platelet, fibrin and erythrocyte aggregation located at the venous or arterial level, resulting in total or partial obstruction of the blood vessel lumen. Placental thromboembolism can prevent maternal oxygenated blood from entering the placental arteries, causing placental insufficiency.

Venous thrombosis of the lower and upper limbs can also cause pulmonary thromboembolism⁽¹⁾. A woman has a higher risk of developing deep vein thrombosis (DVT) after giving birth, because the blood has a higher tendency to coagulate, and women who give birth by caesarean section have a higher risk⁽²⁾.

The incidence of venous thromboembolism during pregnancy is increased 4 to 50 times when compared to the non-pregnant women by changes in coagulation factors. This is between 1 and 1.5 per 1000 tasks⁽³⁾.

There is a predominance of thrombotic events during the first trimester of pregnancy⁽⁴⁾. The accuracy of clinical diagnosis of DVT is limited, only half of the patients with DVT having symptoms or positive findings on physical examination, many symptoms being confused with those of other pathologies⁽⁵⁾.

Placental lesions observed in COVID-19-positive mothers with comorbidities mentioned in the literature are: villous edema, decidual vasculopathy, intramural fibrin deposition, stromal vascular karyorrhexis, thrombosis, peribillin fibrin deposition, chronic villi, obliterative vasculopathy, mononuclear infarction, intervillary fibrin deposition, growth of syncytial nodules, agglutination of the villi, intervillage hemorrhage, presence of macrophage and T cells, lymphohistiocytic inflammation, accelerated maturation of the villi, avascular villi, chorioamnionitis, delayed maturation of the villi,  ischemic necrosis of the villi^(6,7).

Oligohydramnios is defined as a decrease in the amniotic fluid index below the 5^th percentile corresponding to gestational age⁽⁸⁾. An important cause for the appearance of oligohydramnios is the placental insufficiency resulting in the centralization of the fetal circulation and the decrease of the fetal glomerular filtrate, producing a low volume of urine⁽⁹⁾. The treatment of placental insufficiency is done with anticoagulant therapy, preferably low-molecular-weight heparin⁽¹⁰⁾. Prophylaxis and treatment of placental vascular lesions can be done with actovegin (deproteinized hemoderivative from calf blood)⁽¹¹⁾.

Among the clinical manifestations of COVID-19, the main symptom is represented by severe acute respiratory syndrome (SARS). Viruses have killed millions of people and infected more than one hundred million worldwide, resulting in a pandemic. Vertical transmission is rare. The primary mechanism of hypoxemia in incipient respiratory failure of COVID-19 indicates loss of perfusion due to in situ thrombosis. Therefore, postpartum women with diagnosed COVID-19 should undergo anticoagulant therapy⁽¹²⁾.

Case presentation

A 34-year-old patient, C.O., secundipara, with the first fetus born in 2016, prematurely, at 32 weeks of gestation (1800 g), presented in 2021 with incipient intrauterine pregnancy in evolution, with all paraclinical analyses in physiological parameters, and the ultrasound chronological age corresponded to the biometrics of pregnancy at that time (Figures 1, 2 and 3).
 

There were performed fetal abnormality screening ultrasound in the first trimester and noninvasive prenatal screening test involving the isolation of fetal DNA from maternal blood to analyze, by sequencing, certain chromosomal abnormalities of the fetus (aneuploidies of chromosomes 13, 18, 21, X). These turned out to be normal.

At around 15 weeks of gestation, the pregnant woman was infected with SARS-CoV-2, presenting a moderate form of the disease, with cough, altered general condition, temperature of 38.5 degrees Celsius and asthenia; paraclinically, the patient had leukopenia and increased C-reactive protein.

At 18 weeks of pregnancy, the pregnant patient went to the routine checkup, where a severe oligohydramnios (Figures 4, 5 and 6) and a growth restriction of about 2 weeks (Figure 7) were noticed.
 

Two Amnioquick® tests (rapid test) were performed to identify the premature rupture of membranes, and both tests were negative. Anticoagulant therapy was urgently instituted – Clexane® 6000 IU (60 mg)/0.6 ml solution for injection in a pre-filled syringe/day, BMI=20.7, and actovegin 200 mg, 3 tablets/day.

After four weeks of treatment, the amniotic fluid index returned to normal and the fetus resumed the normal growth (Figures 8, 9 and 10).
 

At 24 weeks of gestation, the treatment was reduced to one tablet a day of actovegin, and the anticoagulant treatment remained the same.

The pregnancy evolved physiologically, and the birth occurred at 38 weeks by caesarean section, the fetus weighing 2800 g, with an Apgar index of 9. The placenta was small, vested with a few small areas of infarction and calcification areas, especially in the central area of the placenta (Figure 11).

These changes were caused by the inflammatory process caused by SARS-CoV-2. Recent research has revealed an overexpression of interferon-like genes⁽¹³⁾, as well as an increase in the activity of NK cells⁽¹⁴⁾ and T lymphocytes⁽¹⁵⁾.

The patient’s postpartum evolution was favorable. She was discharged at four days postoperatively and continued the antithrombotic prophylaxis for 14 days.

Conclusions

1. SARS-CoV-2 infection causes an intense systemic inflammatory process (cytokine storm) that is associated with an increased risk of thrombosis, the placenta in particular being a vulnerable organ to these pathophysiological processes.

2. The expression of placental insufficiency is given by the appearance of oligohydramnios, the restriction of intrauterine growth, as well as its structural changes.

3. The changes may be reversible, especially under anticoagulant and vasotrophic therapy. The process is obviously more sustained if the placenta is in the first part of pregnancy and its potential for development is still very good.

4. Vasotrophic and vasotonic medication (actovegin) has a promising role in the treatment of placental insufficiency of various etiologies. New studies are needed to explore the therapeutic potential. 

Conflict of interests: The author declares no con­flict of interests.