Bulletin of RSMU

ISSN Print 2500–1094 ISSN Online 2542–1204

Bulletin of RSMU

BIOMEDICAL JOURNAL OF PIROGOV UNIVERSITY (MOSCOW, RUSSIA)

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Demin NA, Achkasov EE, Polyaev BA, Shishkin AA, Medvedeva AI, Ostanin OE

Muscular dysfunction of the anterior abdominal wall persists in many patients post component separation due to postoperative ventral hernia. Electrical myostimulation can contribute to better recovery, but its efficacy after such surgical procedures is poorly understood. The study aimed to assess the effect of the postoperative electrical myostimulation on the neuromuscular conduction and functional activity of the rectus abdominis muscles. A total of 128 patients (average age 47.9 ± 8.6 years) post component separation were included in a prospective controlled non-randomized study. The index group (n = 64) received electrical myostimulation starting from day 10 (12 sessions, 5–10 min each, 3 times a week, COMPEX SP-2.0® muscle stimulator, Switzerland), and the control one (n = 64) received no electrical myostimulation. Electroneuromyography of the rectus abdominis muscles was performed before and after the course using the Synapsis system (Neurotech, Russia). In the index group, the latency period reduced from 10.1 to 7.9 ms (by 21.8%; p < 0.001), and in the control group it reduced from 9.7 to 9.2 ms (by 5.2%; p < 0.001); the intergroup difference p = 0.002. The M-response amplitude improved in both groups (index group: from 8.4 to 8.9 mV, +5.6%, p < 0.001; control group: from 8.2 to 8.8 mV, +6.8%, p < 0.001), without any intergroup differences (p = 0.295). The induced muscle contraction velocity changed minimally in the index group (from 45.0 to 45.4 m/s, p = 0.049) and did not change in the control group (p = 0.316); in 89.1% of patients, the values were still below normal. Conclusions: postoperative electrical myostimulation significantly accelerates the neuromuscular conduction restoration, but does not affect the muscular response amplitude. It is reasonable to include electrical myostimulation in rehabilitation programmes.

Received: 2026-03-29

Published online: 2026-04-28

DOI: 10.24075/brsmu.2026.020

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VIEWS 71

Dzaraeva ZR, Dulaeva AA, Dudaeva LR, Makieva KA, Tsakhilova ZS, Alakhverdieva SS, Sagilaeva KhM, Kurmagomedov MA, Dzhafarov UL

Type 2 diabetes mellitus (T2D) and obesity enhance systemic inflammation, microcirculation and immune disorders, which can make the course of chronic generalized periodontitis more severe. Comparative assessment of clinical and radiological manifestations of the disease in individuals with these conditions is important for interdisciplinary management of patients. The study aimed to conduct comparative assessment of clinical and radiological manifestations of chronic generalized periodontitis (CGP) in obese patients with T2D and those having no somatic disorders. A total of 90 patients with moderate CGP aged 35–60 were assessed, who were stratified into three groups (30 individuals per group) matched for gender and age: without any somatic disorders, with T2D and obesity. OHI-S, SBI, periodontal pocket depth (PPD), сlinical attachment loss (CAL), and radiological signs of bone resorption were assessed; the analysis of correlations with HbA1c, BMI, and lipid profile was conducted. OHI-S was 1.8 ± 0.3 in group I, 2.3 ± 0.4 in group II, and 2.2 ± 0.5 in group III; SBI was 42 ± 9%, 61 ± 11%, and 56 ± 10%, respectively (p < 0.05 for groups II and III compared to group I). PPD and CAL were higher in obese patients with T2D, than in patients having no somatic disorders (p < 0.05), while the differences between groups II and III were non-significant (for PPD p = 0.09). HbA1c levels were correlated to PPD (r = 0.42), CAL (r = 0.39), and SBI (r = 0.36); BMI was correlated to PPD (r = 0.33) and SBI (r = 0.35) (p < 0.05). Thus, T2D and obesity are associated with the more adverse clinical and radiological manifestations of CGP; it is necessary to consider poorer oral hygiene in patients with comorbidities when interpreting intergroup differences.

Received: 2026-03-19

Published online: 2026-04-28

DOI: 10.24075/brsmu.2026.019

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VIEWS 69

Minasov BSh, Yakupov RR, Akbashev VN, Bilyalov AR, Evgrafov IO, Karimov KK, Minasov IB, Akhmeldinova AA, Salimyanova MR

A chronic periprosthetic infection after knee replacement typically requires two-stage treatment. However, the inter-stage rehabilitation protocol for patients with an articulating spacer has not been adequately developed. This study aimed to determine whether adding interactive biofeedback walking training on the Walker View treadmill enhances the effectiveness of a standard recovery program following the first stage of two-stage revision treatment. The prospective randomized controlled trial included 87 patients who had undergone removal of their endoprostheses and placement of articulating spacers. The treatment group (n = 43) had the standard 21-day rehabilitation program combined with Walker View sessions, while the control group (n = 44) only followed the program. We assessed knee joint movement volume, quadriceps EMG amplitude, stride length, walking speed, postural stability, and SF-36, WOMAC, and KSS scores. By the end of the rehabilitation course, the results registered in the treatment group were better than in the control group: flexion — 78 ± 6° versus 71 ± 7° (p = 0.01); EMG amplitude — 179 ± 16 versus 165 ± 16 μV (p = 0.01); step length — 54.2 ± 5.0 versus 49.5 ± 5.0 cm (p = 0.01); walking speed — 0.70 ± 0.05 versus 0.65 ± 0.05 m/s (p = 0.02); overall stability — 80 ± 8% versus 72 ± 7% (p = 0.01); physical component SF-36 — 51 ± 8 versus 47 ± 7 points (p = 0.01). The differences in WOMAC and KSS scores were insignificant (p = 0.06 and p = 0.07). The inclusion of Walker View sessions in the inter-stage rehabilitation program yields more pronounced improvements in mobility, neuromuscular function, walking, and balance restoration.

Received: 2026-03-21

Published online: 2026-04-27

DOI: 10.24075/brsmu.2026.018

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VIEWS 59

Akkalaev AB, Abdullaeva RR, Aliev MR, Mustafaev RG, Bedoeva AA, Mironova AA, Khugaeva VF, Kadieva LM, Munapova KKh

Systemic osteoporosis is one of the most significant systemic factors capable of worsening bone tissue quality and affect osseointegration of dental implants. The increase in the number of patients of older age groups in need of implant treatment determines high clinical significance of preoperative assessment of the implant bed condition in this category of patients. The study aimed to assess clinical and morphological features of bone tissue in the dental implantation zone in patients with osteoporosis and determine the correlation of those with the primary stability of implants and early marginal bone remodeling. A total of 84 patients aged 55–75 were included in a prospective pilot study, who were planned for implantation in the areas of maxillar and mandibular premolars and molars: 42 with the confirmed systemic osteoporosis and 42 having no signs of osteoporosis. All the patients underwent CBCT with the bone quality and type determination in accordance with the Lekholm and Zarb classification; histological and histo-morphometric analysis of bone biopsy specimens was performed in a subgroup of 32 patients. Primary stability was assessed by the resonance frequency analysis; clinical monitoring was conducted after 2, 6, and 12 months. The D3–D4 type bones were more often found in patients with osteoporosis, along with lower bone density and implant stability quotient (ISQ) values, reduced bone volume fraction (BV/TV), trabecular thinning, and increased RANKL/OPG ratio. There was a positive correlation between the BV/TV, radiological bone density, and primary stability of implants. Systemic osteoporosis degrades the implant bed quality, therefore, the implantation protocol personalization and comprehensive preoperative assessment are required.

Received: 2026-03-19

Published online: 2026-04-25

DOI: 10.24075/brsmu.2026.017

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VIEWS 75

Darawsheh HM, Mellin RV, Akulinichev EA, Moiseev DA, Snezhko OV, Kopetskiy IS, Vasiliev YuL

Treatment of mandibular fractures remains a pressing issue in maxillofacial surgery. This paper presents a novel single-jaw splinting technique (RF patent No. 2735258) for the immobilization of bone fragments in fractures located within the dental arch. Mathematical modeling using the finite element method (FEM), based on computed tomography data from one volunteer, was performed to assess its biomechanical efficiency. A 3D model of the mandible with the fixation construct and an indenter (simulating occlusal load up to 50 N) was constructed. The modeling results showed that the relative movement between the fragments was approximately 25 µm, which is comparable with literature data for two-titanium-plate osteosynthesis. The maximum equivalent stress values in the metal splint reached 100 MPa, and in the splint these reached 3 MPa. The developed method ensures stable fixation without involvement of the maxilla. The analysis involved only a single model and no experimental validation; therefore, confirmation in further research is required. Nevertheless, the obtained data suggest that the method is promising as an alternative to existing immobilization techniques.

Received: 2026-03-03

Published online: 2026-04-23

DOI: 10.24075/brsmu.2026.015

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VIEWS 129

Khetagurov SK, Sadaeva AA, Shovkhalova RU, Murzabekov BI, Dovletmurzaev ZS, Ozkan Zh-M, Sugaipova DA, Betersultanova DI, Oleinik II

Drug-induced xerostomia is common among elderly patients taking multiple medications. The condition significantly affects dental health and quality of life. This study aimed to evaluate the clinical and laboratory characteristics of oral fluid (OF) in xerostomia patients taking xerogenic medications, and to assess associations between total xerogenic load, salivary flow rates, and OF composition. The study included 60 people aged 45–75 years. The treatment group consisted of 40 patients with at least 3 months of dry mouth history and routine intake of two or more medications with known xerogenic potential. The control group included 20 healthy individuals exhibiting no signs of xerostomia and not taking medications routinely. We used the Xerostomia Inventory questionnaire to collect data from the participants; they also underwent clinical dental examination and sialometry for unstimulated and stimulated oral fluid (OF). The fluid samples were examined in the laboratory to determine pH, buffer capacity, total protein content, alpha-amylase activity, glucose and lactate levels. Compared to the control group, patients in the treatment group showed marked hyposalivation, decreased OF pH and buffer capacity, increased total protein content and alpha-amylase activity, and tended more often to have multiple caries lesions, candidal stomatitis, and atrophic changes in the oral mucosa. Thus, drug-induced xerostomia is accompanied by pronounced quantitative and qualitative changes in OF as well dental health and quality of life deterioration. A comprehensive clinical and laboratory assessment of OF provides an objective measure of xerostomia severity and enables compilation of tailored prevention and treatment programs.

Received: 2026-03-19

Published online: 2026-04-22

DOI: 10.24075/brsmu.2026.016

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VIEWS 134

Tsyganov MM, Tsydenova IA, Loos DM, Ibragimova MK

Studying molecular mechanisms of carcinogenesis, including abnormalities of the homologous recombination (HR) system, is an important objective when studying malignization. Dysfunction of HR genes, such as BRCA1/2, contributes to genomic instability and the development of more aggressive tumor clones. The use of chemical carcinogens, such as dimethylbenz(a)anthracene (DMBA), allows one to simulate tumorigenesis processes and assess changes in expression of repair genes. It is important to study such changes to understand the mechanisms underlying adaptation of tumor cells to genotoxic stress and develop personalized approaches to cancer treatment. The study aimed to assess the expression of major HR genes in chemotherapy-induced carcinogenesis in mice. The study involved female outbred ICR laboratory mice (CD-1; n = 20). Two groups of animals were formed: the control group and the treatment group that was administered DMBA. Histological analysis of autopsy specimens was conducted to identify tumors. Gene expression levels were assessed using RT-PCR, and testing for chromosomal aberrations was performed using digital PCR. Tumors were found in four animals. Zero expression of the genes Brca1, Brca2, Cdk12, Chek2, Palb2, Bard1, Brip1 and Rad paralogues was observed in three tumor samples. One sample showed high expression of the genes Cdk12 (14.3), Chek1 (27.6), Rad51d (38.5). Predominance of deletions in the test genes was reported in the majority of cases. Thus, tumorigenesis is associated with the decrease in expression of major repair genes, chromosomal aberration formation, which can contribute to the emergence of more aggressive clones and increase sensitivity to chemotherapy drugs.

Received: 2026-03-17

Published online: 2026-04-19

DOI: 10.24075/brsmu.2026.014

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VIEWS 159

Zinoveva AA, Bakhchinian E, Kamenkov SS, Shcherbakova LN, Bugerenko AE, Ogay DS, Voloshin NS, Chechekhina ES, Kulebyakin KYu

The menopausal transition is accompanied by the decrease in estrogen levels and changes in the estrogen to androgen ratio, resulting in dysregulation of multipotent mesenchymal stem cell (MSCs) differentiation in the subcutaneous adipose tissue, reduction of their adipogenic potential, adipocyte hypertrophy, and metabolic disorder progression. Menopausal hormone therapy (MHT) is used to manage menopausal symptoms. However, the effects of exogenous hormones on MSCs are still poorly understood. The study aimed to assess adipogenic differentiation of the subcutaneous adipose tissue MSCs and their sensitivity to testosterone, 17β-estradiol, and parathyroid hormone (PTH) in postmenopause. A total of six patients with benign gynecological disorders were included in the study, among them two were of reproductive age, one was perimenopausal, and three were postmenopausal. The MSCs adipogenic differentiation was performed throughout 14 days with the addition of testosterone, 17β-estradiol, or PTH, 10 nM each, then the proportion of cells containing lipid droplets was assessed. The adipogenesis level in control samples was 26–30% in patients of childbearing age and 12–42% in postmenopausal ones, with the pronounced interindividual variability. Hormonal stimulation considerably suppressed MSCs adipogenesis in postmenopause: testosterone reduced adipogenesis to 46–56% of control levels, estradiol to 51–84%, PTH to 53–66%, while patients of childbearing age showed a less pronounced effect (65–85%). The obtained data demonstrate a shift in hormonal sensitivity of MSCs from subcutaneous adipose tissue in postmenopause and suggest that MHT may exert an additional inhibiting effect on adipogenesis through suppression of MSCs differentiation.

Received: 2026-03-09

Published online: 2026-04-16

DOI: 10.24075/brsmu.2026.013

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VIEWS 193