Microcirculation disorders caused by thrombosis are the most important factor determining the pathogenesis of organ damage in severe COVID-19 including the absence of obvious macrohemodynamic instability. However, there are very few publications demonstrating the results of intravital visualization of changes in the microcirculation system in this disease.The objective: to assess the state of microcirculation in patients with viral pneumonia associated with COVID-19 using nail bed microscopy.Subjects and methods. Eleven patients with COVID-19 were examined; they were admitted to the intensive care unit due to progressing acute respiratory failure. Vital microscopy of the microcirculatory bloodstream in the fingers’ nail bed was performed by admission and over time. When assessing microcirculation, the presence of aggregates in the lumen of capillaries and avascular zones, and the linear velocity of blood flow were taken into account. The results were summarized taking with the outcome consideration (6 people recovered, 5 died). Results. Microcirculation disorders were objectively confirmed in all patients. In 100% of cases, microaggregates were detected in the capillary lumen. The values of the mean linear velocity of capillary blood flow turned out to be extremely variable. However, the values of the maximum linear velocities of capillary blood flow in the patients who subsequently died were significantly lower versus survivors (190 μm/sec (135.5; 237) and 387 μm/sec (329.3; 407.5), p = 0.018). The irregularity of blood flow in the visualized field was revealed: when the value of the maximum linear velocity in some capillaries was less than 180 µm/sec, in others, disturbances in the form of pendulum-like movement were already noted. Further slowing down of the blood flow velocity led to the development of stasis and the formation of avascular zones.Conclusion. Impaired microcirculation (decreased blood flow rate in the capillaries, the presence of microaggregates and a lower number of perfused capillaries in the form of avascular zones) develops in all patients with severe COVID-19.
Impaired microcirculation due to endothelial dysfunction in COVID-19 is considered to be the most important link in the pathogenesis of this disease. However, due to the complexity of its instrumental assessment in critically ill patients, the data available in the literature on specific manifestations of endothelial dysfunction are very contradictory.The objective: to determine the most characteristic capillaroscopic signs of microvascular disorders and to assess the state of microcirculation regulation in patients with severe COVID-19.Subjects and Methods. When admitted to the intensive care unit, 60 patients with COVID-19 and 12 patients with chronic cardiovascular pathology without COVID-19 (Comparison Group) were examined. All patients underwent microscopy of the microcirculatory bed of finger nail bed; the following parameters were assessed: diameters of the venous, arterial and transitional parts of capillaries, height of capillary loops, density of capillaries per 1 mm of the length of the perivascular zone, the average linear velocity of capillary blood flow (LVCBF), and thickness of the perivascular zone. The presence of avascular zones, the number of capillaries in the visualized field with circulating aggregates in the lumen, and the shape of capillaries were taken into account. In addition, an occlusion test using laser Doppler flowmetry was performed in 32 patients with COVID-19. The maximum post-occlusive increase in blood flow at the moment of cuff deflation was assessed, as well as changes in the mean value of post-occlusive blood flow relative to the baseline within 3 minutes after cuff deflation.Results. In 53 (88.3%) patients with COVID-19, abnormalities corresponding to chronic microcirculatory changes in the form of predominance of pathological capillary forms were detected. Microaggregates in the lumen of capillaries and decreased linear velocity of blood flow were revealed in 100% of cases. When comparing groups of patients with different outcomes, statistically significant differences were revealed between the LVCBF parameters (in the survivors - 354.35 ± 44.78 pm/sec, in the deceased - 278.4 ± 26.59 pm/sec), as well as between the values of the perivascular zones thickness (95.35 ± 15.96 microns versus 159.93 ± 19.90 microns). The results of the post-occlusion test revealed a significant difference between the groups in terms of the maximum post-occlusion gain (39.42 ± 3.85 BPU in the group with a favorable outcome, 27.69 ± 3.19 BPU in the group with an unfavorable outcome, 47.23 ± 1.78 BPU in the control group). In both groups, there was no increase in this parameter relative to the initial blood flow. At the same time, in the control group, the average index of post-occlusive blood flow was higher than the initial level.Conclusions. Acute microcirculation disorders with decreased linear velocity of capillary blood flow, circulation of aggregates, increased thickness of the perivascular zone were detected in all patients with severe COVID-19 but especially in those with unfavorable outcomes. Vascular tone regulation disorders were manifested by the absence of reactive hyperemia in response to acute ischemia, as well as a decrease in maximal flow-induced increase. These changes fit into the concept of endothelial dysfunction. Signs of chronic microcirculation disorders in most patients increase the risk of severe COVID-19.
The problem of postoperative cognitive dysfunction is relevant in obstetrics due to the initial psychophysiological state of a pregnant woman and the high frequency of abdominal delivery everywhere. When choosing the optimal method of anesthesia for a cesarean section, which would minimally affect cognitive functions, it is necessary to consider the impact of anesthesia on the memory and attention of puerperas, as well as their initial cognitive status. To assess memory and attention in women of reproductive age, in our opinion, the most appropriate tests are the MoCA-test, Benton test, Wechsler test, hospital anxiety and depression scale, and a self-assessment questionnaire. These tests are recommended by psychophysiologists and have proven themselves to be well applied in daily clinical practice. Standard test kits with a formalized (quantitative) evaluation of the results allow a rapid assessment of several cognitive functions in a limited time. This review article presents the problem of the cognitive function of pregnant women and postoperative cognitive dysfunction during pregnancy.
The analysis of specific complications endovideosurgical gynecological interventions cases detected ekstraabdominal gas after laparoscopic operations with imposing carboxyperitoneum and resorption of the irrigation solution during hysteroscopy. We present possible mechanisms for the development of subcutaneous emphysema, pneumothorax, pneumomediastinum and overhydration along with discussion of methods of diagnosis and treatment.
The clinical protocol outlines the procedure for the provision of specialized anesthesia-resuscitation assistance in the case of massive obstetric hemorrhages, adopted in the Department of Anaesthesiology and Reanimation of the Ott. Institute of Obstetrics, Gynecology and Reproductology. The protocol emphasizes that the provision of full-fledged assistance with massive obstetric hemorrhages and hemorrhagic shock (GSH) is possible only in conditions of deployed operating room. The recommendations on the implementation of infusion-transfusion therapy (ITT), including venous access and the composition of ITT, on the use of vasoactive therapy, the choice of the method of anesthesia and drugs for its conduct. Other pharmacotherapy with GSH is indicated, including the features of the application of uterotonic drugs. The tactics of respiratory support, as well as the volume of hardware and laboratory monitoring, are presented. Recommendations for the management of patients in the post-shock period are given. The effectiveness of this clinical protocol is confirmed by many years of practice of the department.
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