PERINATAL PECULIARITIES IN WOMEN WITH BENIGN OVARIAN TUMORS

Ovarian tumors may be found in women of any age and the period of pregnancy is no exception. Besides, this period is related to some specific adnexal tumors. A systematic use of ultrasonography in the first trimester of pregnancy has led to a wider detection of symptomless adnexal tumors. The majority of adnexal tumors diagnosed during pregnancy are accidental findings of routine examinations of pregnancy. According to various estimations, the incidence of adnexal neoplasms during pregnancy makes up from 0.19 to 8.8 %. Most of cases are diagnosed in the first trimester and their incidence gradually decreases as the period of pregnancy grows: Trimester 1 – from 21.4 to 75.7 %; Trimester 2 – from 10.9 to 44.4 %; Trimester 3 – from 4 to 22.2 %; after labor – from 0 to 7.1 %. Most of adnexal tumors during pregnancy are benign and physiological and often regress spontaneously. Depending on their size and location, ovarian tumors may be related to an adverse obstetrical result caused by mechanical influence. They increase the risk of abortion (from 0 to 6 %), preterm labor (from 5.8 to 10.4 %) and mechanical impediment to labor. In view of the above mentioned considerations, one of the objectives of our research is to make a retrospective analysis of perinatal peculiarities in women with benign ovarian neoplasms.

The Structure and Properties of Dispersed Aluminium Composite Compounds Made by Welding Friction with Mixing

The use of friction welding with mixing allows to obtain non-defectal compounds of both alloy AL25 and dispersed particles composite aluminum materials. It was found that in addition to changes in the grain structure of the α-Al solid solution, there are changes in the process of the release of particles of intermetallide phases, which can be traced in the morphology, medium size and chemical composition of particles of intermetallide phases of different natures. The change in the morphology of secondary phase particles is due to the difference in thermo mechanical influence in different areas of the formation of the compound when welding friction with mixing.

Progression of axial spondyloarthritis

The spectrum of bone lesions in axial spondyloarthritis is of great interest. With inflammation and mechanical influence concurrence in the background, both tissue gain and tissue loss in a particular bone area can occur simultaneously. Moreover, if vertebral bone mass loss, perhaps, can be easily explained by chronic systemic inflammation, the reason of its gain, observed in axial spondyloarthritis remains a mystery. It is unclear whether it is a consequence of enhanced recovery processes after injury, adaptation to altered mechanical stress, response to inflammatory cells activation or cytokines, produced by them, or changes in Wnt signaling pathways (for example). Whether these factors act individually or collectively is also unclear.

ASONIKA-V: mechanical influence simulation of electronic structures installed on vibration isolators

The ASONIKA-V software package, intended for the mechanical characteristics analysis of the cabinets, racks and blocks of radio-electronic equipment installed on vibration isolators is consi dered. Account of harmonic vibration, random vibration, shock loads, linear acceleration, acoustic noise is provided. The issues of identification, parametric and structural optimization are considered. Keywords radio engineering device; mechanical characteristics; identification; math modeling; vibration isolator; optimization

The prognostic influence of pre-surgery bone conduction values on the improvement of hearing in patients treated surgically as a result of middle-ear conditions

Background The influence of the mechanics of the middle ear on the function of the inner ear has been studied for many years. Among surgeries performed in the middle-ear area, those restoring full functionality of the system transmitting sound inside the middle ear may be pointed out as those fully restoring the mechanical influence of the middle ear on the function of the inner ear. Aim: The aim of the performed analysis is to find the prognostic importance of measured pre-surgery values of bone conduction on the improvement of hearing in patients operated as a result of middle-ear disorders. Methods The analysis included 271 patients hospitalised and operated on due to otosclerosis or perforation of the tympanic membrane between 2016 and 2019. Only patients who had not had a surgical operation within the middle ear prior to the study were included. An audiological assessment was performed with the use of pure tone thresholds audiometry. Results A beneficial influence of the performed surgery on the improvement of bone conduction was observed in patients, in which the average threshold value of bone conduction measured before the surgery did not exceed 40 dB. In cases of the perceptive component of hearing impairment being higher than 40 dB, no statistically significant, beneficial influence of a performed stapedotomy or myringoplasty on the change of bone conduction thresholds was observed. Conclusion The perception component of hearing impairment up to 40 dB indicates bone conduction improvement after surgical restoration of the influence of middle-ear mechanics on the inner ear in patients treated as a result of otosclerosis, as well as of eardrum perforation.