AB0 and rhesus blood groups as a risk factor for ARVI COVID-19.

The frequency of AB0 and Rhesus blood groups was studied in 12120 patients with COVID-19, 5180 convalescent plasma donors and 118801 healthy donors from Moscow, Smolensk, Yakutsk, Minsk and Gomel. In infected individuals, the frequency of blood group A was significantly higher than in uninfected individuals (41,54 % and 34,39 % respectively, p<0,05), and the frequency of blood group 0, on the contrary, was significantly lower (27,69 % and 36,71 %, p<0,05). The frequency of blood group A was particularly high among patients who died from ARVI COVID-19 - 45,51 % vs. 34,39 %, p=0,008. In some groups of patients, there was a decrease in the frequency of Rh-negative individuals (2,23 % vs. 8,30 %, p<0,001).

Treatment of growth-restricted human fetuses with amino acids and glucose supplementation through a chronic fetal intravascular perinatal port system.

OBJECTIVE: Intrauterine growth restriction (IUGR) carries an increased risk of mortality and morbidity. The accepted procedure to treat IUGR fetuses is premature delivery, which may increase neonatal mortality and morbidity and retards neonatal brain development. MATERIAL AND METHODS: We report here on intravascular supplementation with amino acids and glucose of an IUGR human fetus at 33 weeks of gestation with oligohydramnios and placental insufficiency using the port system (Norfolk Medical Products, Skokie, Ill., USA). The catheter was implanted into the umbilical vein (UV) by cordocentesis, and was then connected to a subcutaneously implanted port system. The treatment course included daily infusions of amino acid solution and 10% glucose into the UV. RESULTS: Daily intravascular fetal nutrition significantly improved both fetal condition and fetal weight gain. No complications were seen. The patient was delivered by cesarean section in the 38th week of gestation. The female newborn weighed 2,130 g and was 47 cm long. Blood sampling from the UV after delivery showed no deviations of amino acids in comparison to standardized curves. In one-year follow-up the child's development and weight gain was like that of children without IUGR in the anamnesis. CONCLUSION: This is the first report of the successful use of a subcutaneously implanted intravascular perinatal port system in IUGR human fetuses for long-term administration of nutriments into the UV of a fetus.