14 results on '"Myers, Kristin"'
Search Results
2. The Non-pregnant and Pregnant Human Cervix: a Systematic Proteomic Analysis
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Barnum, Carrie E., Shetye, Snehal S., Fazelinia, Hossein, Garcia, Benjamin A., Fang, Shuyang, Alzamora, Maria, Li, Hongyu, Brown, Lewis M., Tang, Chuanning, Myers, Kristin, Wapner, Ronald, Soslowsky, Louis J., and Vink, Joy Y.
- Published
- 2022
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3. Extracellular Matrix Rigidity Modulates Human Cervical Smooth Muscle Contractility—New Insights into Premature Cervical Failure and Spontaneous Preterm Birth
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Vink, Joy, Yu, Victoria, Dahal, Sudip, Lohner, James, Stern-Asher, Conrad, Mourad, Mirella, Davis, George, Xue, Zenghui, Wang, Shuang, Myers, Kristin, Kitajewski, Jan, Chen, Xiaowei, Wapner, Ronald J., Ananth, Cande V., Sheetz, Michael, and Gallos, George
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- 2021
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4. Prevention of preterm birth: Novel interventions for the cervix.
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Koullali, Bouchra, Westervelt, Andrea R., Myers, Kristin M., and House, Michael D.
- Abstract
Preterm birth is the leading cause of neonatal mortality and morbidity worldwide. Spontaneous preterm birth is a complex, multifactorial condition in which cervical dysfunction plays an important role in some women. Current treatment options for cervical dysfunction include cerclage and supplemental progesterone. In addition, cervical pessary is being studied in research protocols. However, cerclage, supplemental progesterone and cervical pessary have well known limitations and there is a strong need for alternate treatment options. In this review, we discuss two novel interventions to treat cervical dysfunction: (1) injectable, silk protein-based biomaterials for cervical tissue augmentation (injectable cerclage) and (2) a patient-specific pessary. Three-dimensional computer simulation of the cervix is performed to provide a biomechanical rationale for the interventions. Further development of these novel interventions could lead to new treatment options for women with cervical dysfunction. [ABSTRACT FROM AUTHOR]
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- 2017
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5. Collagen Fiber Orientation and Dispersion in the Upper Cervix of Non-Pregnant and Pregnant Women.
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Yao, Wang, Gan, Yu, Myers, Kristin M., Vink, Joy Y., Wapner, Ronald J., and Hendon, Christine P.
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CONNECTIVE tissues ,FIBER orientation ,CERVIX uteri ,PREGNANT women ,PARTURITION - Abstract
The structural integrity of the cervix in pregnancy is necessary for carrying a pregnancy until term, and the organization of human cervical tissue collagen likely plays an important role in the tissue’s structural function. Collagen fibers in the cervical extracellular matrix exhibit preferential directionality, and this collagen network ultrastructure is hypothesized to reorient and remodel during cervical softening and dilation at time of parturition. Within the cervix, the upper half is substantially loaded during pregnancy and is where the premature funneling starts to happen. To characterize the cervical collagen ultrastructure for the upper half of the human cervix, we imaged whole axial tissue slices from non-pregnant and pregnant women undergoing hysterectomy or cesarean hysterectomy respectively using optical coherence tomography (OCT) and implemented a pixel-wise fiber orientation tracking method to measure the distribution of fiber orientation. The collagen fiber orientation maps show that there are two radial zones and the preferential fiber direction is circumferential in a dominant outer radial zone. The OCT data also reveal that there are two anatomic regions with distinct fiber orientation and dispersion properties. These regions are labeled: Region 1—the posterior and anterior quadrants in the outer radial zone and Region 2—the left and right quadrants in the outer radial zone and all quadrants in the inner radial zone. When comparing samples from nulliparous vs multiparous women, no differences in these fiber properties were noted. Pregnant tissue samples exhibit an overall higher fiber dispersion and more heterogeneous fiber properties within the sample than non-pregnant tissue. Collectively, these OCT data suggest that collagen fiber dispersion and directionality may play a role in cervical remodeling during pregnancy, where distinct remodeling properties exist according to anatomical quadrant. [ABSTRACT FROM AUTHOR]
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- 2016
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6. Material properties of mouse cervical tissue in normal gestation.
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Yoshida, Kyoko, Mahendroo, Mala, Vink, Joy, Wapner, Ronald, and Myers, Kristin
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PREGNANCY ,CERVIX erosion ,MICROSTRUCTURE ,FIBROUS composites ,FINITE element method ,LABORATORY mice - Abstract
An appropriately timed cervical remodeling process is critical for a healthy delivery, yet little is known about the material property changes of the cervix in pregnancy because obtaining human tissue samples is difficult. Rodent models offer advantages including accurately timed pregnant tissues and genetically altered models. Determining the material properties of the mouse cervix, however, is challenging because of its small size and complex geometry. The aim of this study is to quantify cervical material property changes in a normal mouse pregnancy using a microstructurally-inspired porous fiber composite model. We mechanically test intact, whole, gestation-timed mouse cervix by pulling apart tensioned sutures through its inner canal. To interpret our mechanical testing results, we conduct an inverse finite element analysis, taking into account the combined loading state of the thick-walled cylindrical tissue. We fit the material model to previous osmotic swelling data and load-deformation data from this study using a nonlinear optimization scheme, and validate the model by predicting a separate set of deformation data. Overall, the proposed porous fiber composite model captures the mechanical behavior of the mouse cervix in large deformation. The evolution of cervical material parameters indicates that in a normal mouse pregnancy, the cervix begins to soften between day 6 and day 12 of a 19-day gestation period. The material parameter associated with the collagen fiber stiffness decreases from 3.4 MPa at gestation day 6 to 9.7e−4 MPa at gestation day 18, while the ground substance stiffness decreases from 2.6e−1 MPa to 7.0e−4 MPa. Statement of Significance Accelerated cervical remodeling can lead to extremely premature births. Little is known, however, about the material property changes of the cervix in pregnancy because pregnant human tissue samples are limited. Rodent models overcome this limitation and provide access to gestation-timed samples. Measuring the material property changes of the mouse cervix in pregnancy is challenging due to its small size and complex geometry. Here, we establish a combined experimental and modeling framework. We use this framework to determine the cervical material property changes throughout a normal mouse pregnancy. We present our experimental methods for mechanically testing whole, intact cervical tissue samples. We fit a porous fiber composite material model to the mechanical data and show that the mouse cervix begins to soften between day 6 and day 12 of a 19-day gestation period. [ABSTRACT FROM AUTHOR]
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- 2016
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7. A continuous fiber distribution material model for human cervical tissue.
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Myers, Kristin M., Hendon, Christine P., Yu Gan, Wang Yao, Kyoko Yoshida, Fernandez, Michael, Vink, Joy, and Wapner, Ronald J.
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CERVICAL cancer , *BIOMECHANICS , *BIOPHYSICS , *MECHANICS (Physics) , *PREGNANCY - Abstract
The uterine cervix during pregnancy is the vital mechanical barrier which resists compressive and tensile loads generated from a growing fetus. Premature cervical remodeling and softening is hypothesized to result in the shortening of the cervix, which is known to increase a woman's risk of preterm birth. To understand the role of cervical material properties in preventing preterm birth, we derive a cervical material model based on previous mechanical, biochemical and histological experiments conducted on nonpregnant and pregnant human hysterectomy cervical tissue samples. In this study we present a three-dimensional fiber composite model that captures the equilibrium material behavior of the tissue in tension and compression. Cervical tissue is modeled as a fibrous composite material, where a single family of preferentially aligned and continuously distributed collagen fibers are embedded in a compressible neo-Hookean ground substance. The total stress in the collagen solid network is calculated by integrating the fiber stresses. The shape of the fiber distribution is described by an ellipsoid where semi-principal axis lengths are fit to optical coherence tomography measurements. The composite material model is fit to averaged mechanical testing data from uni-axial compression and tension experiments, and averaged material parameters are reported for nonpregnant and term pregnant human cervical tissue. The model is then evaluated by investigating the stress and strain state of a uniform thick-walled cylinder under a compressive stress with collagen fibers preferentially aligned in the circumferential direction. This material modeling framework for the equilibrium behavior of human cervical tissue serves as a basis to determine the role of preferentially-aligned cervical collagen fibers in preventing cervical deformation during pregnancy. [ABSTRACT FROM AUTHOR]
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- 2015
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8. The mechanical role of the cervix in pregnancy.
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Myers, Kristin M., Feltovich, Helen, Mazza, Edoardo, Vink, Joy, Bajka, Michael, Wapner, Ronald J., Hall, Timothy J., and House, Michael
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BIOMECHANICS , *CERVIX uteri , *PRENATAL care , *PREGNANCY , *BIOPHYSICS - Abstract
Appropriate mechanical function of the uterine cervix is critical for maintaining a pregnancy to term so that the fetus can develop fully. At the end of pregnancy, however, the cervix must allow delivery, which requires it to markedly soften, shorten and dilate. There are multiple pathways to spontaneous preterm birth, the leading global cause of death in children less than 5 years old, but all culminate in premature cervical change, because that is the last step in the final common pathway to delivery. The mechanisms underlying premature cervical change in pregnancy are poorly understood, and therefore current clinical protocols to assess preterm birth risk are limited to surrogate markers of mechanical function, such as sonographically measured cervical length. This is what motivates us to study the cervix, for which we propose investigating clinical cervical function in parallel with a quantitative engineering evaluation of its structural function. We aspire to develop a common translational language, as well as generate a rigorous integrated clinical-engineering framework for assessing cervical mechanical function at the cellular to organ level. In this review, we embark on that challenge by describing the current landscape of clinical, biochemical, and engineering concepts associated with the mechanical function of the cervix during pregnancy. Our goal is to use this common platform to inspire novel approaches to delineate normal and abnormal cervical function in pregnancy. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
9. Measuring the compressive viscoelastic mechanical properties of human cervical tissue using indentation.
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Yao, Wang, Yoshida, Kyoko, Fernandez, Michael, Vink, Joy, Wapner, Ronald J., Ananth, Cande V., Oyen, Michelle L., and Myers, Kristin M.
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VISCOELASTIC materials ,MECHANICAL behavior of materials ,INDENTATION (Materials science) ,CERVIX uteri ,FETUS ,PREGNANCY complications - Abstract
Abstract: The human cervix is an important mechanical barrier in pregnancy which must withstand the compressive and tensile forces generated from the growing fetus. Premature cervical shortening resulting from premature cervical remodeling and alterations of cervical material properties are known to increase a woman׳s risk of preterm birth (PTB). To understand the mechanical role of the cervix during pregnancy and to potentially develop indentation techniques for in vivo diagnostics to identify women who are at risk for premature cervical remodeling and thus preterm birth, we developed a spherical indentation technique to measure the time-dependent material properties of human cervical tissue taken from patients undergoing hysterectomy. In this study we present an inverse finite element analysis (IFEA) that optimizes material parameters of a viscoelastic material model to fit the stress–relaxation response of excised tissue slices to spherical indentation. Here we detail our IFEA methodology, report compressive viscoelastic material parameters for cervical tissue slices from nonpregnant (NP) and pregnant (PG) hysterectomy patients, and report slice-by-slice data for whole cervical tissue specimens. The material parameters reported here for human cervical tissue can be used to model the compressive time-dependent behavior of the tissue within a small strain regime of 25%. [Copyright &y& Elsevier]
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- 2014
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10. A new paradigm for the role of smooth muscle cells in the human cervix.
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Vink, Joy Y., Qin, Sisi, Brock, Clifton O., Zork, Noelia M., Feltovich, Helen M., Chen, Xiaowei, Urie, Paul, Myers, Kristin M., Hall, Timothy J., Wapner, Ronald, Kitajewski, Jan K., Shawber, Carrie J., and Gallos, George
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SMOOTH muscle ,PREMATURE labor ,CELL contraction ,HYSTERECTOMY ,CELL morphology ,CELLS ,CERVIX uteri ,DOSE-effect relationship in pharmacology ,IMMUNOHISTOCHEMISTRY ,PREMATURE infants ,NIFEDIPINE ,OXYTOCIN ,RESEARCH funding ,UTERINE contraction ,OXYTOCICS ,TOCOLYTIC agents ,PHARMACODYNAMICS - Abstract
Background: Premature cervical remodeling resulting in spontaneous preterm birth may begin with premature failure or relaxation at the internal os (termed "funneling"). To date, we do not understand why the internal os fails or why funneling occurs in some cases of premature cervical remodeling. Although the human cervix is thought to be mostly collagen with minimal cellular content, cervical smooth muscle cells are present in the cervix and can cause cervical tissue contractility.Objective: To understand why the internal os relaxes or why funneling occurs in some cases of premature cervical remodeling, we sought to evaluate cervical smooth muscle cell content and distribution throughout human cervix and correlate if cervical smooth muscle organization influences regional cervical tissue contractility.Study Design: Using institutional review board-approved protocols, nonpregnant women <50 years old undergoing hysterectomy for benign indications were consented. Cervical tissue from the internal and external os were immunostained for smooth muscle cell markers (α-smooth muscle actin, smooth muscle protein 22 calponin) and contraction-associated proteins (connexin 43, cyclooxygenase-2, oxytocin receptor). To evaluate cervical smooth muscle cell morphology throughout the entire cervix, whole cervical slices were obtained from the internal os, midcervix, and external os and immunostained with smooth muscle actin. To correlate tissue structure with function, whole slices from the internal and external os were stimulated to contract with 1 μmol/L of oxytocin in organ baths. In separate samples, we tested if the cervix responds to a common tocolytic, nifedipine. Cervical slices from the internal os were treated with oxytocin alone or oxytocin + increasing doses of nifedipine to generate a dose response and half maximal inhibitory concentration. Student t test was used where appropriate.Results: Cervical tissue was collected from 41 women. Immunohistochemistry showed cervical smooth muscle cells at the internal and external os expressed mature smooth muscle cell markers and contraction-associated proteins. The cervix exhibited a gradient of cervical smooth muscle cells. The area of the internal os contained 50-60% cervical smooth muscle cells that were circumferentially organized in the periphery of the stroma, which may resemble a sphincter-like pattern. The external os contained approximately 10% cervical smooth muscle cells that were randomly scattered in the tissue. In organ bath studies, oxytocin stimulated the internal os to contract with more than double the force of the external os (1341 ± 693 vs 523 ± 536 integrated grams × seconds, respectively, P = .009). Nifedipine significantly decreased cervical tissue muscle force compared to timed vehicle control (oxytocin alone) at doses of 10(-5) mol/L (vehicle 47% ± 15% vs oxytocin + nifedipine 24% ± 16%, P = .007), 10(-4) mol/L (vehicle 46% ± 16% vs oxytocin + nifedipine -4% ± 20%, P = .003), and 10(-3) mol/L (vehicle 42% ± 14% vs oxytocin + nifedipine -15% ± 18%, P = .0006). The half maximal inhibitory concentration for nifedipine was 1.35 × 10(-5) mol/L.Conclusion: Our findings suggest a new paradigm for cervical tissue morphology-one that includes the possibility of a specialized sphincter at the internal os. This new paradigm introduces novel avenues to further investigate potential mechanisms of normal and premature cervical remodeling. [ABSTRACT FROM AUTHOR]- Published
- 2016
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11. A systematic evaluation of collagen cross-links in the human cervix.
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Zork, Noelia M., Myers, Kristin M., Yoshida, Kyoko, Cremers, Serge, Jiang, Hongfeng, Ananth, Cande V., Wapner, Ronald J., Kitajewski, Jan, and Vink, Joy
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BIOMECHANICS ,COLLAGEN ,PROTEIN crosslinking ,PERIMENOPAUSE ,HYSTERECTOMY ,PYRIDINOLINE - Abstract
Objective The mechanical strength of the cervix relies on the cross-linking of the tissue’s collagen network. Clinically, the internal os is functionally distinct from the external os. We sought to detect specific collagen cross-links in human cervical tissue and determine whether cross-link profiles were similar at the internal and external os. Study Design Transverse slices of cervical tissue were obtained at the internal and external os from 13 nonpregnant, premenopausal women undergoing a benign hysterectomy. To understand how cross-links were distributed throughout the entire cervix and at the internal and external os, biopsies were obtained from 3 circumferential zones in 4 quadrants from each slice. Biopsies were pulverized, lyophilized, reduced with sodium borohydride, hydrolyzed with hydrochloric acid, and reconstituted in heptafluorobutyric acid buffer. Hydroxyproline was measured by ultraperformance liquid chromatography-electrospray ionization tandem mass spectrometry (UPLC-ESI-MS/MS), converted to total collagen, and normalized by dry weight. Collagen cross-links pyridinoline (PYD), deoxypyridinoline (DPD), dihydroxylysinonorleucine (DHLNL), and the nonenzymatic advanced glycation end product pentosidine (PEN) were measured by UPLC-ESI-MS/MS and reported as cross-link density ratio (cross-link/total collagen). Generalized estimated equation analysis was used to compare results between the internal and external os and to compare quadrants and zones within slices from the internal and external os to determine if cross-link profiles were similar. Results A total of 592 samples from 13 patients were analyzed. Collagen cross-links are detectable in the human cervix by UPLC-ESI-MS/MS. When comparing all samples from the internal and external os, similar levels of collagen content, PYD, DHLNL, and DPD were found, but PEN density was higher at the external os (0.005 vs 0.004, P = .001). When comparing all internal os samples, significant heterogeneity was found in collagen content and cross-link densities across zones and quadrants. The external os exhibited heterogeneity only across zones. Conclusion Collagen cross-links (PYD, DPD, DHLNL, and PEN) are detectable by UPLC-ESI-MS/MS in the human cervix. The internal os exhibits significant collagen cross-link heterogeneity compared with the external os. Further studies are needed to evaluate how collagen cross-link heterogeneity correlates to the mechanical strength and function of the human cervix. [ABSTRACT FROM AUTHOR]
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- 2015
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12. Novel regulatory roles of small leucine-rich proteoglycans in remodeling of the uterine cervix in pregnancy.
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Colon-Caraballo, Mariano, Lee, Nicole, Nallasamy, Shanmugasundaram, Myers, Kristin, Hudson, David, Iozzo, Renato V., and Mahendroo, Mala
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PROTEOGLYCANS , *CERVIX uteri , *COLLAGEN , *PREMATURE rupture of fetal membranes , *PREGNANCY - Abstract
• Nonpregnant and pregnant compound-null mice deficient in class i (decorin and biglycan) and class II (lumican) SLRPs demonstrate inappropriate assembly of collagen fibrils and elastic fibers in the cervix. • Decorin and biglycan influence the uniformity of collagen fibril structure and spacing and their loss impacts the mechanical properties of the cervix during pregnancy. • Formation of mature hydroxylysylpyridinoline (HP) collagen cross-links is independent of decorin and biglycan interactions in the cervical ECM. • Synergistic regulatory functions of class I and class II SLRPs ensure ECM homeostasis through all stages of cervical remodeling. The cervix undergoes rapid and dramatic shifts in collagen and elastic fiber structure to achieve its disparate physiological roles of competence during pregnancy and compliance during birth. An understanding of the structure-function relationships of collagen and elastic fibers to maintain extracellular matrix (ECM) homeostasis requires an understanding of the mechanisms executed by non-structural ECM molecules. Small-leucine rich proteoglycans (SLRPs) play key functions in biology by affecting collagen fibrillogenesis and regulating enzyme and growth factor bioactivities. In the current study, we evaluated collagen and elastic fiber structure-function relationships in mouse cervices using mice with genetic ablation of decorin and/or biglycan genes as representative of Class I SLRPs, and lumican gene representative of Class II SLRP. We identified structural defects in collagen fibril and elastic fiber organization in nonpregnant mice lacking decorin, or biglycan or lumican with variable resolution of defects noted during pregnancy. The severity of collagen and elastic fiber defects was greater in nonpregnant mice lacking both decorin and biglycan and defects were maintained throughout pregnancy. Loss of biglycan alone reduced tissue extensibility in nonpregnant mice while loss of both decorin and biglycan manifested in decreased rupture stretch in late pregnancy. Collagen cross-link density was similar in the Class I SLRP null mice as compared to wild-type nonpregnant and pregnant controls. A broader range in collagen fibril diameter along with an increase in mean fibril spacing was observed in the mutant mice compared to wild-type controls. Collectively, these findings uncover functional redundancy and hierarchical roles of Class I and Class II SLRPs as key regulators of cervical ECM remodeling in pregnancy. These results expand our understating of the critical role SLRPs play to maintain ECM homeostasis in the cervix. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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- View/download PDF
13. Magnetic resonance imaging of three-dimensional cervical anatomy in the second and third trimester
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House, Michael, Bhadelia, Rafeeque A., Myers, Kristin, and Socrate, Simona
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URINARY organs , *PREMATURE infant diseases , *CROSS-sectional method , *MUCOUS membranes , *THIRD trimester of pregnancy , *SECOND trimester of pregnancy , *CERVIX uteri physiology , *MAGNETIC resonance imaging - Abstract
Abstract: Objective: Although a short cervix is known to be associated with preterm birth, the patterns of three-dimensional, anatomic changes leading to a short cervix are unknown. Our objective was to (1) construct three-dimensional anatomic models during normal pregnancy and (2) use the models to compare cervical anatomy in the second and third trimester. Study design: A cross-sectional study was performed in a population of patients referred to magnetic resonance imaging (MRI) for a fetal indication. Using magnetic resonance images for guidance, three-dimensional solid models of the following anatomic structures were constructed: amniotic cavity, uterine wall, cervical stroma, cervical mucosa and anterior vaginal wall. To compare cervical anatomy in the second and third trimester, models were matched according the size of the bony pelvis. Results: Fourteen patients were imaged and divided into two groups according to gestational age: 20–24 weeks (n =7)) and 31–36 weeks (n =7). Compared to the second trimester, the third trimester was associated with significant descent of the amniotic sac (p =.02). Descent of the amniotic sac was associated with modified anatomy of the uterocervical junction. These three-dimensional changes were associated with a cervix that appeared shorter in the third trimester. Conclusion: We report a technique for constructing MRI-based, three-dimensional anatomic models during pregnancy. Compared to the second trimester, the third trimester is associated with three-dimensional changes in the cervix and lower uterine segment. [Copyright &y& Elsevier]
- Published
- 2009
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14. The mechanical role of the cervix in pregnancy
- Author
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Joy Vink, Kristin M. Myers, Helen Feltovich, Timothy J. Hall, Michael House, Ronald J. Wapner, Edoardo Mazza, Michael Bajka, University of Zurich, and Myers, Kristin M
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medicine.medical_specialty ,media_common.quotation_subject ,Biophysics ,Biomedical Engineering ,2204 Biomedical Engineering ,610 Medicine & health ,Cervix Uteri ,Models, Biological ,Article ,2732 Orthopedics and Sports Medicine ,Pregnancy ,Medicine ,Animals ,Humans ,Orthopedics and Sports Medicine ,Function (engineering) ,Intensive care medicine ,Cervix ,media_common ,Cause of death ,Fetus ,business.industry ,Obstetrics ,Rehabilitation ,medicine.disease ,10174 Clinic for Gynecology ,3. Good health ,Biomechanical Phenomena ,Cervical Change ,2742 Rehabilitation ,Uterine cervix ,medicine.anatomical_structure ,Premature birth ,Premature Birth ,Female ,Collagen ,business ,1304 Biophysics - Abstract
Appropriate mechanical function of the uterine cervix is critical for maintaining a pregnancy to term so that the fetus can develop fully. At the end of pregnancy, however, the cervix must allow delivery, which requires it to markedly soften, shorten and dilate. There are multiple pathways to spontaneous preterm birth, the leading global cause of death in children less than 5 years old, but all culminate in premature cervical change, because that is the last step in the final common pathway to delivery. The mechanisms underlying premature cervical change in pregnancy are poorly understood, and therefore current clinical protocols to assess preterm birth risk are limited to surrogate markers of mechanical function, such as sonographically measured cervical length. This is what motivates us to study the cervix, for which we propose investigating clinical cervical function in parallel with a quantitative engineering evaluation of its structural function. We aspire to develop a common translational language, as well as generate a rigorous integrated clinical-engineering framework for assessing cervical mechanical function at the cellular to organ level. In this review, we embark on that challenge by describing the current landscape of clinical, biochemical, and engineering concepts associated with the mechanical function of the cervix during pregnancy. Our goal is to use this common platform to inspire novel approaches to delineation of normal and abnormal cervical function in pregnancy.
- Published
- 2015
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