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Medical Sciences

Medical Sciences is an international, peer-reviewed, open access journal, providing a platform for advances in basic, translational and clinical research, published quarterly online by MDPI.
The Korean Society of Physical Medicine (KSPM) is affiliated with Medical Sciences and its members receive discounts on the article processing charges.
Indexed in PubMed | Quartile Ranking JCR - Q1 (Medicine, General and Internal)

All Articles (1,047)

Background/Objectives: Given the rising prevalence of autoimmune diseases and the need for new insights into the pathology of these disorders, it is important to summarize current knowledge, with an emphasis on Hashimoto’s thyroiditis (HT), since it is especially on the rise. Hypoxia is part of various pathophysiological conditions, and hypoxia-inducible factor (HIF) is a key factor in these processes. Hypoxia is involved in the regulation of hormones and the development of endocrine disorders. With this in mind, this narrative review summarizes the current state of knowledge on the relationship between autoimmune diseases, focusing on HT and the effects of hypoxia through the role of HIF. Methods: Multiple databases such as PubMed, NIH, Scopus, Web of Science, ScienceDirect, and Google Scholar were thoroughly searched for relevant keyword. Results: In HT, thyrocyte-derived reactive oxygen species and chronic lymphocytic infiltration stabilize HIF-1α, tilting CD4+ T cell polarity towards Th17 and away from regulatory T cells. Increased levels of Mammalian target of rapamycin (mTOR)/HIF-1α and reduced Sirtuin 1 (SIRT1) in T cells from patients diagnosed with HT confirm this metabolic skew. Furthermore, the data position HIF-1α as a therapeutic target. Inhibitors of mTOR or agents that restore SIRT1 could complement levothyroxine and antioxidant strategies. Hypoxia and the HIF signaling pathway have a role in energy homeostasis through various ways, for example, via metabolic effects of thyroid hormones, which are associated with the clinical manifestations of HT. Conclusions: Elucidation of HIF-1α-centered gene networks and testing of HIF-targeted interventions may curb the growing clinical burden of HT.

28 January 2026

Effects of HIF-1α under normal oxygen conditions and oxygen deprivation. Under normal oxygen conditions, the prolyl hydroxylase domain protein (PHD) recognizes and hydroxylates proline residues in the oxygen-dependent degradation domain (ODDD) of the α-subunit of HIF. The von Hippel–Lindau protein (pVHL) recognizes the hydroxylated proline residues and ubiquitylates the HIF-1α subunit. The HIF-1α is then degraded by the E3 ubiquitin ligase in the ubiquitin–proteasome system. In hypoxia, the activity of PHD is reduced, and degradation of the HIF-1α subunit does not occur, but heterodimerization with the HIF-1β subunit occurs. The HIF-1α and HIF-1β heterodimer attaches to hypoxia response elements (HREs) and stimulates the transcription of numerous target genes, including VEGF (vascular endothelial growth factor) and ncRNA (non-coding RNA). PHD—prolyl hydroxylase domain protein, pVHL—von Hippel–Lindau protein, HRE—hypoxia response elements, VEGF—vascular endothelial growth factor, and ncRNA—non-coding RNA.

Alcohol Consumption Patterns and Traditional Beverages Associated with Hypertension Subtypes

  • Fiorella E. Zuzunaga-Montoya,
  • Jhosmer Ballena-Caicedo and
  • Víctor Juan Vera-Ponce
  • + 3 authors

Introduction: Alcohol consumption is a significant risk factor for hypertension (HTN), a prevalent condition that substantially affects cardiovascular health. In Peru, where various traditional alcoholic beverages exist, the relationship between alcohol consumption and HTN has not been fully explored. Objective: To determine the association between different patterns of alcohol consumption, types of beverages, and various types of HTN. Methods: This cross-sectional analytical study utilized data from the Peruvian Demographic and Family Health Survey (2018–2023), including 236,243 adults (55.95% male; mean age: 41.06 years). General HTN, isolated systolic hypertension (ISH), isolated diastolic hypertension (IDH), and systolic-diastolic hypertension (SDH) were evaluated. Alcohol consumption was assessed through self-reported questionnaires evaluating consumption pattern (non-excessive vs. excessive), intensity (light, moderate, heavy), consistency (intermittent vs. consistent), and primary beverage type, including both commercial and traditional Peruvian drinks. Results: Excessive alcohol consumption was significantly associated with an increased risk of HTN (aPR: 1.19, 95% CI: 1.07–1.31), IDH (aPR: 1.61, 95% CI: 1.20–2.16), and SDH (aPR: 1.45, 95% CI: 1.18–1.78). Excessive alcohol consumption was significantly associated with an increased risk of HTN (aPR: 1.19, 95% CI: 1.07–1.31), IDH (aPR: 1.61, 95% CI: 1.20–2.16), and SDH (aPR: 1.45, 95% CI: 1.18–1.78). Consumption of traditional beverages such as chicha and Masato was associated with an elevated risk of various types of HTN. In contrast, wine consumption demonstrated a protective association against general HTN and IDH. Conclusions: Alcohol consumption patterns and beverage types have differential effects on HTN risk in the Peruvian population. These findings underscore the need for culturally adapted prevention strategies and more nuanced public health recommendations regarding alcohol consumption in Peru.

28 January 2026

Distribution of alcohol types consumed in the population.

Background: Osteoradionecrosis (ORN) following head and neck radiotherapy has been demonstrated to induce structural and functional alterations of the upper airway, with the potential to complicate the process of tracheal intubation. Despite its clinical relevance, there is a paucity of systematic evidence on airway characteristics in ORN and reliable predictors of difficult tracheal intubation. This study compares preoperative airway parameters and tracheal intubation outcomes in irradiated patients with and without ORN and introduces a novel preoperative ORN-Difficult-Airway Score for risk stratification. Methods: In this retrospective cohort study, airway assessments, tracheal intubation methods, and perioperative visualization parameters were evaluated in 105 patients following head and neck radiotherapy. Group differences between non-ORN and ORN were analyzed using chi-square tests. A preoperative ORN-Difficult-Airway Score was constructed using exclusively bedside parameters, based on statistically and clinically relevant predictors. Results: Patients with ORN showed significantly restricted mouth opening (p < 0.001), higher Mallampati classes, particularly Mallampati IV, and a greater need for fiberoptic tracheal intubation (p < 0.01). Direct laryngoscopy (DL) was significantly less feasible in ORN, while hyperangulated videolaryngoscopy (VL) yielded consistently positive visualization (first-pass success (FPS) 100% in both groups). Under DL, FPS was lower in ORN (54.2% vs. 79.5%), resulting in an odds ratio of 0.305. Based on observed predictors, ORN status, mouth opening <3 cm, Mallampati class, restricted neck reclination, and history of difficult intubation, a preoperative ORN-Difficult-Airway Score was developed. Conclusions: ORN has been associated with distinct alterations in airway anatomy and visualization, resulting in increased tracheal intubation complexity after head and neck radiotherapy. The proposed ORN-Difficult-Airway Score presents a clinically practical, bedside-applicable approach to stratifying the risk of tracheal intubation in this population. Prior to clinical implementation, prospective validation in larger cohorts is warranted.

27 January 2026

First-pass success (FPS) rates for direct laryngoscopy (DL) and videolaryngoscopy (VL) in patients with and without osteoradionecrosis (ORN). Error bars indicate 95% confidence intervals.

Background/Objectives: Drug-induced sleep endoscopy (DISE) is used in obstructive sleep apnea (OSA) to visualize dynamic upper airway collapse, but sedation protocols vary widely with no consensus on the optimal agent or technique. This narrative review aims to clarify current sedation strategies for DISE in OSA and their clinical implications. Methods: We systematically searched PubMed, Scopus, Web of Science, and Cochrane Library for English-language publications on DISE sedation (2000–2025). Relevant clinical studies, guidelines, and reviews were included. Data were qualitatively synthesized due to heterogeneity among studies. Results: Sedation approaches in DISE varied considerably. Propofol, dexmedetomidine, and midazolam were the primary agents identified. Propofol provided rapid, titratable sedation but increased airway collapsibility at higher doses; dexmedetomidine produced a more natural sleep-like state with minimal respiratory depression; midazolam was less favored due to prolonged effects. Use of target-controlled infusion (TCI) and pharmacokinetic–pharmacodynamic (PK–PD) models improved control of propofol sedation. Co-sedative adjuncts (e.g., opioids) reduced the required sedative dose but added risk of respiratory depression. Careful titration to the lowest effective dose-often guided by bispectral index (BIS) monitoring—was emphasized to achieve adequate sedation without artifactual airway collapse. No universal DISE sedation protocol was identified. Conclusions: Optimal DISE sedation balances adequate depth with patient safety to ensure reliable findings. Using the minimum effective dose, guided by objective monitoring (e.g., BIS), is recommended. There is a need for standardized sedation protocols and further research (e.g., in obese patients) to resolve current controversies and improve DISE’s utility in OSA management.

24 January 2026

Conceptual framework of PK–PD–guided sedation in DISE. Selection of the PK–PD (pharmacokinetic-pharmacodynamic) model for target-controlled infusion (TCI)—including traditional models (e.g., Marsh, Schnider) and newer general-purpose models (e.g., Eleveld)—determines effect-site targeting and sedation depth. Together with the sedative approach (manually controlled infusion, MCI, or TCI), sedation state monitoring using processed electroencephalography (pEEG), patient positioning, and inter-observer variability, these factors modulate upper airway biomechanics and ultimately influence the diagnostic fidelity of drug-induced sleep endoscopy (DISE).

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Med. Sci. - ISSN 2076-3271