Irina Manuela Nistor

Dr. Irina Manuela Nistor

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Research Focus & Metrics

Academic Career Length

10Years (2017-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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4 July 2024 in Medicina
Verified
Journal Article
Open access
PDF file
INIrina Manuela Nistor
Irina Manuela Nistor
SFSIMONA FICA
SIMONA FICA
CMCARMEN MARTIN
CARMEN MARTIN
Theodor MustataTheodor Mustata
Theodor Mustata
EOEugen Theodor Oprea
Eugen Theodor Oprea
CBCarmen Gabriela Barbu
Carmen Gabriela Barbu
Background and Objectives: The literature suggests that physiological menopause (MP) seems linked with increased adiposity with a preference for intra-abdominal fat accumulation, greater than what can be attributed only by aging, which could magnify this period’s increased cardiovascular risk. Materials and Methods: We retrospectively analyzed two age and body mass index (BMI) propensity-matched subgroups each formed of 90 clinically healthy, 40–60-year-old postmenopausal women, within the first 5 and 5–10 years of MP. The 10-year ASCVD risk was assessed using medical history, anthropometric data, and lipid profile blood tests. The android-to-gynoid (A/G) ratio was computed using Lunar osteodensitometry lumbar spine and hip scans. Results: The A/G ratio was significantly higher for the subgroup evaluated in years 5–10 of MP than in the first 5 years of MP, even after controlling for BMI (1.05 vs. 0.99, p = 0.005). While displaying a significant negative correlation with HDL cholesterol (r = 0.406), the A/G ratio also had positive correlations with systolic blood pressure (BP) values (r = 0.273), triglycerides (r = 0.367), and 10-year ASCVD risk (r = 0.277). After adjusting for smoking, hypertension treatment, and type 2 diabetes, the 10-year ASCVD risk became significantly different for women in the first 5 years (3.28%) compared to those in years 5–10 of MP (3.74%), p = 0.047. Conclusions: In women with similar age and BMI, the A/G ratio appears to vary based on the number of years since menopause onset and correlates with either independent cardiovascular risk parameters like BP, triglycerides, and HDL cholesterol or with composite scores, such as 10-year ASCVD risk.

1 January 2017 in Endoscopic Ultrasound
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Journal Article
Open access
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MCMohan Cooray
Mohan Cooray
INIrina Manuela Nistor
Irina Manuela Nistor
JPJoe Pham
Joe Pham
DBDouglas Bair
Douglas Bair
NANaveen Arya
Naveen Arya
Background and Objectives: A Canadian Community Hospital launched a new Endoscopic Ultrasound (EUS) Program in 2011. The aim of this study was to report the accuracy of EUS-fine needle aspiration (EUS-FNA) of solid lesions over time as it pertains to cytotechnologists' involvement and learning curves. Methods: The electronic medical records of patients that had a EUS from July 2011 to January 2014 were retrospectively reviewed. Only solid lesions with FNA sampling were included in the study. The primary outcome assessed was the accuracy of specimen acquisition for pathological review. The secondary outcome was diagnostic accuracy. Cases were separated by chronological order into thirds for the assessment of learning curves. Cytotechnologists' involvement was correlated to determine its impact on accuracy. Results: Two hundred and seventy-one EUS-FNA procedures were completed for solid lesions. Cytotechnologists' involvement resulted in a specimen acquisition accuracy of 82.6%, compared with 68.8% without a cytotechnologist (P = 0.009; 95% confidence interval [CI] 3.2%–25.0%). Diagnostic accuracy was 74.2% with a cytotechnologist while 62.4% without a cytotechnologist (P = 0.038; 95% CI 0.3%–23.7%). The specimen acquisition accuracy increased from 73.2% from the first third of cases to 92.3% for the last third with a cytotechnologist (P = 0.004; 95% CI 6%–33.0%). Without a cytotechnologist, the specimen accuracy was 67.6% for the first third while 57.7% for the last third of cases (P = 0.434; 95% CI − 33.9–14.4%). In the multivariable regression analysis, after adjusting for other predictors, a present cytotechnologist (P = 0.022) and lesion size 21 mm–30 mm (P = 0.039) and >30 mm (P = 0.001) were significantly associated with increased specimen acquisition accuracy. Only a present cytotechnologist (P = 0.046) was significantly associated with increased diagnostic accuracy. Interpretation: Cytotechnologists' involvement significantly improved the accuracy of specimen acquisition. Although accuracy was impacted by a cytotechnologist learning curve, our results highlight the importance of a cytotechnologist being present for EUS-FNA sampling of solid lesions.

28 January 2026 in Healthcare
Verified
Journal Article
Open access
PDF file
CBCarmen Gabriela Barbu
Carmen Gabriela Barbu
INIrina Manuela Nistor
Irina Manuela Nistor
AAAlice Ioana Albu
Alice Ioana Albu
CMCARMEN MARTIN
CARMEN MARTIN
EOEugen Theodor Oprea
Eugen Theodor Oprea
SFSIMONA FICA
SIMONA FICA
Background/Objectives: Midlife is associated with changes in body weight and fat distribution in women; however, it remains unclear whether these changes can be attributed to chronological aging, menopause, or associated lifestyle changes. The objective of this study was to compare the possible differences in body fat distribution parameters measured by regional Lunar osteodensitometry scans (DXA) between clinically healthy, BMI-matched pre- and postmenopausal women. Methods: A cross-sectional analysis of body composition parameters, such as total body, android, and gynoid fat percentage, was performed using DXA hip and lumbar scans in 171 women aged 45–55 years. Comparisons were made across 50 premenopausal (median age 47.9 (4.5) years) and 121 postmenopausal women (median age 51.7 (3.7) years), matched for median BMI (25.8 (6.7) vs. 25.6 (7.8) kg/m2). Associations between body fat outcomes and predictors were examined using multivariable linear regression. Results: No significant differences were observed between study groups in body composition parameters, including android fat percentage (%), gynoid fat%, total body fat%, or android/gynoid ratio. Unlike age, menopausal status, or years since menopause, BMI was the only significant predictor of body fat distribution. In the entire cohort, total body fat percentage showed a modest but significant positive correlation with age (ρ = 0.200, 95%CI [0.043, 0.345], p = 0.009), while the menopause onset age was positively correlated with BMI (ρ = 0.195, 95%CI [0.002, 0.369], p = 0.032). Among postmenopausal women within the first two years of menopause, the android/gynoid ratio showed a positive correlation with years of estrogen deprivation (ρ = 0.451, 95%CI [0.144, 0.707], p = 0.007). Conclusions: Age was correlated with higher total body fat %; neither age nor menopausal status was correlated with BMI. In early postmenopause, the android/gynoid ratio increased with years since menopause. The median age at menopause observed in our study was 48 years, which is lower than in other Caucasian studies.

29 May 2025 in Therapeutic Advances in Endocrinology and Metabolism
Verified
Journal Article
Open access
INIrina Manuela Nistor
Irina Manuela Nistor
SFSIMONA FICA
SIMONA FICA
SMSorina Carmen Martin
Sorina Carmen Martin
MMMarius Lucian Mitrache
Marius Lucian Mitrache
TOTheodor Eugen Oprea
Theodor Eugen Oprea
CBCarmen Gabriela Barbu
Carmen Gabriela Barbu
Introduction: Although measuring bone mineral density (BMD) with dual X-ray absorptiometry (DXA) represents the standard of diagnosis and management of osteoporosis, there is a significant number of fragility fractures occurring in young patients without low BMD. Recently, clinical risk tools included hip axis length (HAL), a geometric parameter derived from the hip DXA scan, as a predictor of hip fractures in older postmenopausal women. This study aims to evaluate the relationship between HAL and other cortical bone fractures in young postmenopausal, clinically healthy women. Materials and methods: This study is a retrospective analysis of Lunar DXA scans of 206 normal or overweight Caucasian women aged 40–60, who had less than 10 years of menopause without secondary causes of osteoporosis, no prior osteoporosis diagnosis or medication, and no history of hip or vertebral fractures. Results: The 15 fractured women displayed statistically greater HAL values compared to the 191 non-fractured subjects (109.43 ± 6.44 vs 104.81 ± 5.32 mm, p = 0.002), even though there were no significant differences in age, body mass index, or BMD. The difference in HAL remained significant after adjusting for lumbar spine (LS) BMD and height (108.49 ± 1.23 vs 104.88 ± 0.34 mm, p = 0.005). HAL proved to be a fair indicator of non-hip, non-vertebral cortical fractures (area under curve = 0.720, p = 0.003), with a sensitivity of 86.7% and a specificity of 55.5%. Conclusion: HAL was positively associated with non-hip, non-vertebral cortical bone fragility fractures in young postmenopausal, clinically healthy women and had significantly greater values in the fractured subgroup even after adjusting for LS BMD and height.