“The Accessory Ethmoidal Canal Does Not Necessarily Contain an Arterial Structure”

Introduction: The aim of our study is to describe the prevalence of the accessory ethmoidal artery in endonasal endoscopic cadaver dissections and to identify its intraorbital origin. Material and Methods: From 2018 to 2020, thirty-four nasal dissections were performed in seventeen adult cadaveric heads. We performed a complete ethmoidectomy to identify the ethmoidal canals. Then, we removed the bony canal and the lamina papiracea to verify the injected vessel and to confirm the vascular structure inside the canal. Results: We found the anterior ethmoidal canal (AEC) and the posterior ethmoidal canal (PEC) in 100% of nasal cavities (34/34). We identified 4 accessory ethmoidal canals (AcEC) in the 34 nasal fossae dissected (12%). All AEC contained an arterial vessel. The AcEC contained an arterial vascular structure in 2 cases, a neural structure in other specimen, and in the fourth case no structure could be verified. In 32 of 34 nasal cavities, the PEC contained an artery and only in 2 cases the PEC did not contain any vascular structure. In these specimens, we observed that the AcEC with an arterial vessel inside (6%) was closer to the posterior canal than the anterior canal. Conclusion: According to our findings, we can suggest that the presence of a canal does not necessarily imply the presence of an arterial vessel, and that presence of the accessory ethmoidal artery could be associated with the absence of posterior ethmoidal artery.

Extrathoracic lung sequestration in newborns: cases report

BACKGROUND: Extrathoracic lung sequestration is a rare variant of a developmental malformation that can be diagnosed prenatally and should be included in the differential diagnosis of abdominal tumor-like formations. CASES REPORT: From 1996 to 2020, 70 children with confirmed lung sequestration were treated at the Children's City Hospital No. 1 in St. Petersburg. Of these, 29 had intralobar sequestration, and 41 had extralobar sequestration. Four of these patients were diagnosed with a rare extrathoracic (intraabdominal) form. All four were born full-term without clinical manifestations of the defect. Ultrasound examination of all children revealed a solid formation up to 3 cm in diameter, located in the upper left quadrant of the abdominal cavity or retroperitoneal space in the projection of the left adrenal gland. Due to the location of the formation and the inability to visualize the aberrant arterial vessel during ultrasound examination, the first two patients were differentially diagnosed with an adrenal tumor (neuroblastoma). The cancer markers were negative, and adrenal cortex hormones were normal. The children underwent multispiral computed tomography-angiography to clarify the diagnosis. In both cases, the diagnosis of intraabdominal extrapulmonary sequestration with a feeding arterial vessel extending from the thoracic aorta was confirmed. Two children, previously treated in the last two years, were diagnosed by the ultrasound examination results that enabled the visualization of an aberrant arterial vessel feeding the sequester. Indications for surgical treatment have been set. The parents of one child refused treatment. Three children underwent sequestration removal (two by laparoscopic access, one had a laparotomy). Histologically, extrathoracic sequestration in combination with cystoadenomatosis was confirmed. The postoperative period proceeded without complications. RESULTS: Long-term treatment results were observed in all operated patients for a period of four to 10 years. The assessment was performed based on complaints and ultrasound data. All patients matured and developed according to their ages. CONCLUSIONS: Extrathoracic lung sequestration is a rare type of defect that is subject to surgical treatment. This pathology should be included on the spectrum of differential diagnosis of tumorous formations of the abdominal cavity and retroperitoneal space in newborns. The main methods for postnatal diagnosis of the defect are ultrasound and multispiral computed tomography-angiography.

Modeling of restenosis of main arteries after the intravascular stenting interventions

Objectives to study the mechanism of restenosis after the intra-arterial stenting using the original device for modeling of intra-arterial blood flow. Material and methods. To perform the experiment, we have created the original device simulating the intra-arterial blood flow. A glass tube of rotameter was the imitation of the arterial vessel. The closed system was filled with the liquid imitating blood, specifically the solution of glycerin the same viscosity as the human blood plasma. Using our original model of intra-artetial blood flow, we were able to study the intra-arterial hemodynamics under different conditions of cardiovascular system functioning, including arrhythmias. Results. In extrasystolic arrhythmia, during the spread of the first post-extrasystolic wave, we observed the intensive impact of pressure wave (the indicator was the silk thread) on the vessel walls with forming of reflected and standing waves. Putting the piezo crystal probe of pressure inside the tube, we verified our observations. The increase of pressure during the spread of the first post-extrasystolic wave in multiple measurements had a mean value of 160% in comparison with the pressure during the regular heart rhythm. Conclusion. The hydraulic shock appears during the spread of the first post-extrasystolic wave in the arterial vessel. Its effect on hemodynamics grows in case of the frequent extrasystoles and allorhythmia. The mechanical impact of hydraulic shock in extrasystoles can be the starting point of the restenosis onset and progressing in the intra-arterial stent.

The Development of the Structure of Atherosclerosis and Aspects of Coronary Heart Disease

The genesis of arteriosclerosis and, as a consequence, coronary heart disease is put up for discussion. On the basis of morphological considerations, it appears to be absurd to define the cause of arteriosclerosis exclusively on the molecular level. Cholesterol is a functionally important building block in the body. It is regulated by the body. Long-term observations of statin therapy indicate consequential damage, which makes it necessary to rethink this form of therapy. The cause of arteriosclerosis is the result of a chronic ischemic disorder of the arterial vessel wall

Imaging endogenous HClO in atherosclerosis using a novel fast-response fluorescence probe

A novel probe S-ClO was developed, which could selectively sense HClO as well as monitor HClO-induced arterial vessel inflammation.