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Sedighi M, Seidi H, Asadi F, Biranvand H, Banaei P, Torkashvand M, Nazari A, Rafieian-Kopaei M, Hashemzadeh P, Kiani A, Ghorbanzadeh V. CARDIOPROTECTIVE EFFECT OF DICHLOROMETHANE VALERIAN (VALERIANA OFFICINALIS) EXTRACT ON ISCHEMIA-REPERFUSION-INDUCED CARDIAC INJURIES IN RATS. Acta Endocrinol (Buchar) 2023; 19:178-186. [PMID: 37908890 PMCID: PMC10614589 DOI: 10.4183/aeb.2023.178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
Background Valepotriate is an active ingredient of valerian (Valeriana officinalis) with strong antioxidant activity that is effective for numerous cardiovascular diseases. Objective The aim of this study was to investigate the effect of an active ingredient of V. officinalis extract on ischemia-reperfusion-induced cardiac injuries in male rats. Methods Thirty-two male rats were subjected to ischemia for 40 minutes and reperfusion for five days. The rats were divided into 4 groups of 8 each; group 1 (control) was given normal saline, and groups 2-4 were gavaged with 0.2, 0.1, 0.05 mg/kg of valepotriate extract, respectively, and received extract (0.2 mg/kg ip) two weeks before ischemia induction. Results Dichloromethane V. officinalis (valepotriate) extract exerted a protective effect against ischemia-reperfusion-induced injuries. So that infarct size and number of ventricular arrhythmia and ventricular escape beats decreased compared to the control group. Moreover, ST segment amplitude, QTC interval, and heart rate decreased in the injured hearts and serum levels of antioxidant enzymes glutathione peroxidase, catalase, and superoxide dismutase increased. Biochemical markers malondialdehyde and lactate dehydrogenase also decreased on day 5 after the onset of reperfusion. Conclusion V. officinalis extract may have a protective effect against myocardial ischemia-reperfusion by producing antioxidant effects.
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Affiliation(s)
- M. Sedighi
- Cardiovascular Research Center, Shahid Rahimi Hospital, Lorestan University of Medical Sciences
| | - H. Seidi
- Lorestan University of Medical Sciences, Faculty of Pharmacy
| | - F. Asadi
- Lorestan University of Medical Sciences, Faculty of Pharmacy
| | - H. Biranvand
- Lorestan University of Medical Sciencse, Department of Physiology, Khorramabad
| | - P. Banaei
- Bu Ali Sina University, Faculty of Sports Sciences, Hamadan
| | - M. Torkashvand
- University of Tehran, College of Engineering, Fouman Faculty of Engineering,Tehran
| | - A. Nazari
- Cardiovascular Research Center, Shahid Rahimi Hospital, Lorestan University of Medical Sciences
| | - M. Rafieian-Kopaei
- Shahrekord University of Medical Sciences, Basic Health Sciences Institute, Medical Plants Research Center, Shahrekord
| | - P. Hashemzadeh
- Lorestan University of Medical Sciences, Department of Medical Biotechnology, Faculty of Medicine, Khoramabad
| | - A.A. Kiani
- Lorestan University of Medical Sciences, Department of Hematology and Blood Transfusion, Khoramabad, Iran
| | - V. Ghorbanzadeh
- Cardiovascular Research Center, Shahid Rahimi Hospital, Lorestan University of Medical Sciences
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Saraee F, Shekari F, Moini A, Sadeghi M, Ghaznavi P, Nazari A, Ghaheri A, Totonchi M, Eftekhari-Yazdi P. P-388 Isolation and characterization of human uterine fluid lavage-derived extracellular vesicles by three different methods for optimal embryo transfer timing discovery. Hum Reprod 2022. [DOI: 10.1093/humrep/deac107.365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Study question
What is the suitable method for isolating extracellular vesicles (EVs) from a small volume of Uterine Fluid Lavage (UFL)?
Summary answer
It seems that the qEV column can help in faster, precise, and gentle isolation of EVs from small amounts of UFL.
What is known already
Several studies have discovered that existing EVs in the UFL, which are informative carriers, reflect cytological and molecular conditions of the uterine environment. The relative amounts of the EV components are different in various physiological situations. So, they are the ideal source for precise molecular analysis of the uterine condition to identify the Window of Implantation (WOI) for appropriate embryo transfer (ET) timing. There is limited information describing the most efficient method for EV isolation from a low-volume sample of biological fluids. In particular, EV separation from some biological fluids such as UFL is more complicated because of the viscosity.
Study design, size, duration
The study was conducted in two steps; first, the pre-implantation UFL sampling effect was studied on the implantation and clinical pregnancy rates. UFLs were obtained from 20 IVF Frozen Embryo Transfer (FET) patients as the case group. The control group consisted of 20 FET patients without lavage. In the second step, UFLs (n = 30) were collected and pooled. The EVs were extracted by ultracentrifugation (UC), Sucrose cushion (Suc), and Size-exclusion chromatography (by the qEV column) methods.
Participants/materials, setting, methods
First, UFL was collected two days before frozen blastocyst ET from the case group using an intrauterine insemination catheter attached to a syringe. Then, patients were compared with control at the seventh week. Second, EVs were extracted from pooled UFL samples and characterized by Dynamic Light Scattering (DLS), Scanning Electron Microscopy (SEM), and Western Blot (WB). Albumin contamination was detected by SDS-PAGE. Total RNA was extracted, and Real-time PCR was performed for six housekeeping genes.
Main results and the role of chance
A comparison between case and control groups indicated no significant difference for implantation and clinical pregnancy rates. Moreover, we have confirmed the presence of EVs in UFL that were successfully isolated, by the UC, Suc, the qEV methods. The SEM images showed that the collected vesicles were morphologically spherical. The DLS analysis revealed that the intensity peak of isolated particles with the UC and Suc methods were 281 nm and 216 nm, respectively. Extracted EVs using the qEV technique were smaller and homogenized in size, with an intensity peak of 67.7 nm. SDS-PAGE of EVs showed a weaker albumin band in the qEV column (with a 100 kDa filter) method than the UC, Suc, and qEV column (with a 30 kDa filter) methods. Although, their quantification showed no significant differences. WB analysis indicated common EV markers (D81, CD9, CD63, and TSG101) showed better expression using the qEV extraction technique. But CD9 and TSG101 had lower expression levels in EVs isolated using Suc and UC, respectively. Calnexin was not detected in the isolated EVs. The GAPDH, 18SrRNA, ACTIN, GUSB, HMBS, and YWHAZ genes were detected by real-time PCR in all three EV extraction methods. The 18SrRNA gene showed better CT values.
Limitations, reasons for caution
Uterine fluid samples collection from qualified study groups and the patient’s follow-up for ensuring successful implantation and clinical pregnancy are time-consuming. The low volume of uterine fluid lavage sample and consequently the low number of extracellular vesicles inside it was also the limitation of this study.
Wider implications of the findings
Endometrial receptivity assay is difficult to study non-invasively. Herein, endometrial secretome EVs as a minimally invasive source for uterine environment molecular assessment is presented. High-throughput analysis of EV components can offer biomarkers for individual determination of ET timing, providing an additional method to use with transvaginal-ultrasonography for assessing endometrial receptivity.
Trial registration number
not applicable
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Affiliation(s)
- F Saraee
- Department of Embryology- Reproductive Biomedicine Research Center- Royan Institute for Reproductive Biomedicine- ACECR- Tehran- Iran., Department of Embryology , Tehran, Iran
- Department of Developmental Biology- University of Science and Culture- ACECR- Tehran- Iran., Department of Developmental Biology , Tehran, Iran
| | - F Shekari
- Department of Developmental Biology- University of Science and Culture- ACECR- Tehran- Iran., Department of Developmental Biology , Tehran, Iran
- Department of Stem Cells and Developmental Biology- Cell Science Research Center- Royan Institute for Stem Cell Biology and Technology- ACECR- Tehran- Iran., Department of Stem Cells and Developmental Biology , Tehran, Iran
| | - A Moini
- Department of Endocrinology and Female Infertility- Reproductive Biomedicine Research Center- Royan Institute for Reproductive Biomedicine- ACECR- Tehran- Iran., Department of Endocrinology and Female Infertility , Tehran, Iran
- Department of Obstetrics and Gynecology- Tehran University of Medical Sciences- Tehran- Iran., Department of Obstetrics and Gynecology , Tehran, Iran
| | - M Sadeghi
- Department of Endocrinology and Female Infertility- Reproductive Biomedicine Research Center- Royan Institute for Reproductive Biomedicine- ACECR- Tehran- Iran., Department of Endocrinology and Female Infertility , Tehran, Iran
| | - P Ghaznavi
- Department of Embryology- Reproductive Biomedicine Research Center- Royan Institute for Reproductive Biomedicine- ACECR- Tehran- Iran., Department of Embryology- , Tehran, Iran
| | - A Nazari
- Department of Stem Cells and Developmental Biology- Cell Science Research Center- Royan Institute for Stem Cell Biology and Technology- ACECR- Tehran- Iran., Department of Stem Cells and Developmental Biology , Tehran, Iran
| | - A Ghaheri
- Reproductive Epidemiology Research Center- Royan Institute for Reproductive Biomedicine- ACECR- Tehran- Iran., Reproductive Epidemiology Research Center , Tehran, Iran
| | - M Totonchi
- Department of Stem Cells and Developmental Biology- Cell Science Research Center- Royan Institute for Stem Cell Biology and Technology- ACECR- Tehran- Iran., Department of Stem Cells and Developmental Biology , Tehran, Iran
- Department of Genetics- Reproductive Biomedicine Research Center- Royan Institute for Reproductive Biomedicine- ACECR- Tehran- Iran., Department of Genetics , Tehran, Iran
| | - P Eftekhari-Yazdi
- Department of Embryology- Reproductive Biomedicine Research Center- Royan Institute for Reproductive Biomedicine- ACECR- Tehran- Iran., Department of Embryology , Tehran, Iran
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Hesari T, Tahoori F, Nazari A, Salehi Najafabadi Z, Samianifard M, Faramarzi A, Soleimani M. Investigation of the Effect of PEG Detoxification on Diphtheria Vaccine. Arch Razi Inst 2022; 77:739-745. [PMID: 36284980 PMCID: PMC9548256 DOI: 10.22092/ari.2021.354020.1621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Accepted: 06/19/2021] [Indexed: 06/16/2023]
Abstract
Immunization has been considered a successful global health program that saves many persons' lives each year. The vaccines reduce the risk of getting the disease by building immunity in the body. Therefore, the constant availability of essential vaccines is an important factor in community health. One of the most important vaccines is the diphtheria vaccine, which is usually used as Multivalent diphtheria-tetanus-pertussis (DTP) combination vaccines. The production of this vaccine takes about 45 days, from the initial bacterial culture to the end of toxin production. However, the production of this vaccine can be optimized in case the production stages are carried out under normal conditions. In this study, a significant amount of impurities was removed after washing with phosphate buffer saline, and the toxin was then purified by Sephadex G-50. In this method, the toxin was concentrated to be stored in a smaller space (this removes the concerns for the provision of a suitable space). Another problem with the diphtheria vaccine is that it is reversible after detoxification of the toxin using formaldehyde. For this reason, it is suggested to use MPEG for detoxification, which will produce more stable covalent bonds between PEG and the first type of amine groups in the toxin chain. Tests were performed to evaluate factors, such as in vivo cytotoxicity, lack of edemas formation, the neutralizing activity of serum from guinea pigs immunized with the diphtheria toxoid inactivated with MPEG, and the immunogenic activity of the purified and modified toxin. Comparison of this PEG detoxification toxoid with the standard toxoid produced in Razi Vaccine and Serum Institution, Karaj, Iran, showed that washing with PBS and purification with Sephadex G-50 was an efficient method. The stability and reversibility of the toxoid approved by MPEG were acceptable. Therefore, the results of animal tests showed that the obtained product was stable and caused no wound or necrosis in the tested animals.
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Affiliation(s)
- T Hesari
- Imam Khomeini International University, Qazvin, Iran
| | - F Tahoori
- Department of Human Bacterial vaccine, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | - A Nazari
- Department of Proteomics-Biochemistry, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | - Z Salehi Najafabadi
- Department of Human Bacterial vaccine, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | - M Samianifard
- Department of Proteomics-Biochemistry, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | - A Faramarzi
- Department of Human Bacterial vaccine, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | - M Soleimani
- Imam Khomeini International University, Qazvin, Iran
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Samianifard M, Nazari A, Tahoori F, Mohamadpour Dounighi N. Proteome Analysis of Toxic Fractions of Iranian Cobra (Naja naja Oxiana) Snake Venom Using Two-Dimensional Electrophoresis and Mass Spectrometry. Arch Razi Inst 2021; 76:127-138. [PMID: 33818965 DOI: 10.22092/ari.2020.128766.1428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 03/14/2020] [Indexed: 09/30/2022]
Abstract
Snake venoms are mostly composed of various proteins and peptides with toxicity and pharmacological effects depending on their geographical sources. Naja naja oxiana is one of the most medically important venomous snakes in Iran and Central Asia. The bite of this type of snake can cause severe pain and swelling, as well as neurotoxicity. Without medical treatment, symptoms quickly worsen and death can occur soon. A detailed understanding of venom components can provide new insight into the production of antivenom against toxic agents instead of crude venom. Specific antibodies against toxic fractions are of utmost importance in neutralizing crude venom. Therefore, the proteome profile of these fractions of Naja naja oxidana venom was analyzed using fractionation by gel filtration, two-dimensional electrophoresis, mass spectrometry, and data mining. Base on the results, in total, 32 spots were detected and categorized into three protein families, namely three-finger toxin (3FTx), phospholipase, and Cysteine-rich secretory proteins (CRISP). These proteins consist of more than 70% crude venom all with a molecular weight below 25 kDa. The 3FTx as a highly diverse constituent in the venom of Naja species was in large quantity in this district. Short-chain neurotoxins, including short neurotoxin, cytotoxin, and muscarinic toxin-like protein, were in abundance, respectively. In conclusion, the recognition of toxic fractions of Naja naja oxiana in this region could be of great help in the production of an effective antivenom against similar compositions. It can also help the medical care department to find out the clinical sign of cobra venom. To the best of our knowledge, this was the first study to report the proteomic of toxic fractions of Naja naja oxiana in Iran.
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Affiliation(s)
- M Samianifard
- Department of Proteomics-Biochemistry, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | - A Nazari
- Department of Proteomics-Biochemistry, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.,Department of Proteomics-Biochemistry, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | - F Tahoori
- Department of Human Bacterial Vaccine, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
| | - N Mohamadpour Dounighi
- Department of Venomous Animal, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
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Nazari A, Chehelcheraghi F. Using Apelin and exercise to protect the cardiac cells: synergic effect in ischemia reperfusion injuries treatment in rats. ACTA ACUST UNITED AC 2020; 121:14-21. [PMID: 31950835 DOI: 10.4149/bll_2020_003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
AIM Apelin is an active endogenous peptide, which affects blood vessels. Also exercise increases angiogenesis after myocardial infarction and exerts cardio protective effects. The aim of the present study was to investigate the effect of Apelin and aerobic exercise on reducing the severity of Ischemia-reperfusion injury in rats. METHODS The rats were divided into the following 4 groups 8 weeks before surgery (Langendorff model of perfusion): I) Ischemia-reperfusion (I/R), II: Exercise Ischemia- reperfusion (EX+I/R), III: Apelin+Ischemia-reperfusion (APE+I/R) (Apelin 10 nmol/kg/day, i.p), and IV: Exercise+Apelin+Ischemia-reperfusion (EX+APE+I/R). Exercise was performed on a treadmill 8 weeks before the surgery at a speed of 17 m/min for 10 to 50 min/day. The ventricular function was evaluated after I/R injury, histopathological and immunohistopathology indices were then measured at the scar tissue. RESULTS The results of H(et)E, Masson's trichrome staining indicated that APE+EX pre-treatment reduced cardiac fibrosis and the percentage of collagen deposition. It also enhanced the microvessels density (MVD) and decreased the number of inflammatory cells and apoptosis rate. CONCLUSION According to our study, Apelin and exercise preconditioning had anti-fibrotic and anti-apoptotic effects on the ischemia-reperfusion myocardium cells, which could lead to the protection of cardiac cells (Tab. 5, Fig. 3, Ref. 33).
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Nazari A, Chehelcheraghi F. Using Apelin and exercise to protect the cardiac cells: synergic effect in ischemia reperfusion injuries treatment in rats. BRATISL MED J 2020; 121:14-21. [PMID: 31950835 DOI: 10.4149/bll_2020_00] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
AIM Apelin is an active endogenous peptide, which affects blood vessels. Also exercise increases angiogenesis after myocardial infarction and exerts cardio protective effects. The aim of the present study was to investigate the effect of Apelin and aerobic exercise on reducing the severity of Ischemia-reperfusion injury in rats. METHODS The rats were divided into the following 4 groups 8 weeks before surgery (Langendorff model of perfusion): I) Ischemia-reperfusion (I/R), II: Exercise Ischemia- reperfusion (EX+I/R), III: Apelin+Ischemia-reperfusion (APE+I/R) (Apelin 10 nmol/kg/day, i.p), and IV: Exercise+Apelin+Ischemia-reperfusion (EX+APE+I/R). Exercise was performed on a treadmill 8 weeks before the surgery at a speed of 17 m/min for 10 to 50 min/day. The ventricular function was evaluated after I/R injury, histopathological and immunohistopathology indices were then measured at the scar tissue. RESULTS The results of H(et)E, Masson's trichrome staining indicated that APE+EX pre-treatment reduced cardiac fibrosis and the percentage of collagen deposition. It also enhanced the microvessels density (MVD) and decreased the number of inflammatory cells and apoptosis rate. CONCLUSION According to our study, Apelin and exercise preconditioning had anti-fibrotic and anti-apoptotic effects on the ischemia-reperfusion myocardium cells, which could lead to the protection of cardiac cells (Tab. 5, Fig. 3, Ref. 33).
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Zorriehzahra MEJ, Ghasemi M, Ghiasi M, Karsidani SH, Bovo G, Nazari A, Adel M, Arizza V, Dhama K. Retraction notice to "Isolation and confirmation of viral nervous necrosis (VNN) disease in golden grey mullet (Liza aurata) and leaping mullet (Liza saliens) in the Iranian waters of the Caspian Sea" [Vet. Microbiol. 190 (2016) 27-37]. Vet Microbiol 2019; 237:108417. [PMID: 31521390 DOI: 10.1016/j.vetmic.2019.108417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- M E J Zorriehzahra
- Aquatic Animal Health & Diseases Dept., Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research Education and Extension Organization (AREEO), Tehran, Islamic Republic of Iran.
| | - M Ghasemi
- Department of Fish Diseases, Inland Water Aquaculture Institute, Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research Education and Extension Organization (AREEO), Anzali, Gilan, Islamic Republic of Iran
| | - M Ghiasi
- Department of Fish Diseases, Caspian Sea Ecology Research Center, Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research Education and Extension Organization (AREEO), Sari, Islamic Republic of Iran
| | - S Haghighi Karsidani
- Department of Fisheries, Bandar-e-Anzali Branch, Islamic Azad University, Gilan, Islamic Republic of Iran
| | - G Bovo
- OIE Reference Lab. for Encephalopathy and Retinopathy, Instituto Zooprofilattico Sperimentale delle Venezie, Viale dell'Università, Padova, Italy
| | - A Nazari
- Department of Aquaculture, Falavarjan Branch, Islamic Azad University, Falavarjan, Islamic Republic of Iran
| | - M Adel
- Aquatic Animal Health & Diseases Dept., Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research Education and Extension Organization (AREEO), Tehran, Islamic Republic of Iran
| | - V Arizza
- Department of Stebicef, Università degli Studi di Palermo, Via Archirafi, Palermo, Italy
| | - K Dhama
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India
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Tehrani L, Sheibani A, Nazari A. Optimization of N-acetylcysteine Determination by Ion Mobility Spectrometry using Central Composite Design. J Anal Chem 2018. [DOI: 10.1134/s1061934818100118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Golezar E, Mahdiuni H, Nazari A. Different Antioxidant Activity Measurements of the Aerial Parts of Ferulago angulate, Traditional Food Additives in Iran. Indian J Pharm Sci 2017. [DOI: 10.4172/pharmaceutical-sciences.1000306] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Zorriehzahra M, Ghasemi M, Ghiasi M, Karsidani S, Bovo G, Nazari A, Adel M, Arizza V, Dhama K. RETRACTED: Isolation and confirmation of viral nervous necrosis (VNN) disease in golden grey mullet (Liza aurata) and leaping mullet (Liza saliens) in the Iranian waters of the Caspian Sea. Vet Microbiol 2016; 190:27-37. [DOI: 10.1016/j.vetmic.2016.04.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 02/09/2016] [Accepted: 04/25/2016] [Indexed: 10/21/2022]
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Leong HY, Ong DEL, Sanjayan JG, Nazari A. A genetic programming predictive model for parametric study of factors affecting strength of geopolymers. RSC Adv 2015. [DOI: 10.1039/c5ra16286f] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Genetic programming to present a predictive model for parametric analysis of the factors affecting compressive strength of geopolymers.
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Affiliation(s)
- H. Y. Leong
- Research Centre for Sustainable Technologies
- Faculty of Engineering, Science & Computing
- Swinburne University of Technology Sarawak Campus
- 93350 Kuching
- Malaysia
| | - D. E. L. Ong
- Research Centre for Sustainable Technologies
- Faculty of Engineering, Science & Computing
- Swinburne University of Technology Sarawak Campus
- 93350 Kuching
- Malaysia
| | - J. G. Sanjayan
- Centre for Sustainable Infrastructure
- Faculty of Science, Engineering and Technology
- Swinburne University of Technology
- Hawthorn
- Australia
| | - A. Nazari
- Centre for Sustainable Infrastructure
- Faculty of Science, Engineering and Technology
- Swinburne University of Technology
- Hawthorn
- Australia
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Nazari A, Fanaei H, Dehpour AR, Hassanzadeh G, Jafari M, Salehi M, Mohammadi M. Chemical composition and hepatoprotective activity of ethanolic root extract of Taraxacum Syriacum Boiss against acetaminophen intoxication in rats. ACTA ACUST UNITED AC 2015; 116:41-6. [DOI: 10.4149/bll_2015_008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Yahyazadehfar M, Nazari A, Kruzic JJ, Quinn GD, Arola D. An inset CT specimen for evaluating fracture in small samples of material. J Mech Behav Biomed Mater 2014; 30:358-68. [PMID: 24268892 PMCID: PMC4059206 DOI: 10.1016/j.jmbbm.2013.10.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 10/15/2013] [Accepted: 10/19/2013] [Indexed: 11/26/2022]
Abstract
In evaluations on the fracture behavior of hard tissues and many biomaterials, the volume of material available to study is not always sufficient to apply a standard method of practice. In the present study an inset Compact Tension (inset CT) specimen is described, which uses a small cube of material (approximately 2×2×2mm(3)) that is molded within a secondary material to form the compact tension geometry. A generalized equation describing the Mode I stress intensity was developed for the specimen using the solutions from a finite element model that was defined over permissible crack lengths, variations in specimen geometry, and a range in elastic properties of the inset and mold materials. A validation of the generalized equation was performed using estimates for the fracture toughness of a commercial dental composite via the "inset CT" specimen and the standard geometry defined by ASTM E399 (2006). Results showed that the average fracture toughness obtained from the new specimen (1.23±0.02MPam(0.5)) was within 2% of that from the standard. Applications of the inset CT specimen are presented for experimental evaluations on the crack growth resistance of dental enamel and root dentin, including their fracture resistance curves. Potential errors in adopting this specimen are then discussed, including the effects of debonding between the inset and molding material on the estimated stress intensity distribution. Results of the investigation show that the inset CT specimen offers a viable approach for studying the fracture behavior of small volumes of structural materials.
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Affiliation(s)
- M Yahyazadehfar
- University of Maryland Baltimore County, Department of Mechanical Engineering, 1000 Hilltop Circle, Baltimore, MD 21250, USA
| | - A Nazari
- University of Maryland Baltimore County, Department of Mechanical Engineering, 1000 Hilltop Circle, Baltimore, MD 21250, USA
| | - J J Kruzic
- Materials Science, School of Mechanical(,) Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR, 97331, USA
| | - G D Quinn
- University of Maryland Baltimore County, Department of Mechanical Engineering, 1000 Hilltop Circle, Baltimore, MD 21250, USA
| | - D Arola
- University of Maryland Baltimore County, Department of Mechanical Engineering, 1000 Hilltop Circle, Baltimore, MD 21250, USA; Department of Endodontics, Prosthodontics, and Operative Dentistry, Baltimore College of Dental Surgery, University of Maryland, Baltimore, MD 21201, USA.
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Marchiafava, Prof. E, Bignami A, Nazari A. Ueber System-Degeneration der Kommissurbahnen des Gehirns bei chronischem Alkoholismus. pp. 200–215. Eur Neurol 2009. [DOI: 10.1159/000203425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Marchiafava, Prof. E, Bignami A, Nazari A. Ueber System-Degeneration der Kommissurbahnen des Gehirns bei chronischem Alkoholismus. pp. 181–199. Eur Neurol 2009. [DOI: 10.1159/000203424] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Marchiafava, Prof. E, Bignami A, Nazari A. Ueber System-Degeneration der Kommissurbahnen des Gehirns bei chronischem Alkoholismus. (Schluss.). Eur Neurol 2009. [DOI: 10.1159/000203444] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Nazari A, Bajaj D, Zhang D, Romberg E, Arola D. Aging and the reduction in fracture toughness of human dentin. J Mech Behav Biomed Mater 2009; 2:550-9. [PMID: 19627862 DOI: 10.1016/j.jmbbm.2009.01.008] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2008] [Revised: 01/05/2009] [Accepted: 01/07/2009] [Indexed: 11/17/2022]
Abstract
An evaluation of the crack growth resistance of human coronal dentin was performed on tissue obtained from patients between ages 18 and 83. Stable crack extension was achieved over clinically relevant lengths (0< or = a < or =1mm) under Mode I quasi-static loading and perpendicular to the nominal tubule direction. Results distinguished that human dentin exhibits an increase in crack growth resistance with extension (i.e. rising R-curve) and that there is a significant reduction in both the initiation (K(o)) and plateau (K(p)) components of toughness with patient age. In the young dentin (18< or =age< or =35) there was a 25% increase in the crack growth resistance from the onset of extension (K(o)=1.34 MPa m(0.5)) to the maximum or "plateau" toughness (K(p)=1.65 MPa m(0.5)). In comparison, the crack growth resistance of the old dentin (55< or =age) increased with extension by less than 10% from K(o)=1.08 MPa m(0.5) to K(p)=1.17 MPa m(0.5). In young dentin toughening was achieved by a combination of inelastic deformation of the mineralized collagen matrix and microcracking of the peritubular cuffs. These mechanisms facilitated further toughening via the development of unbroken ligaments of tissue and posterior crack-bridging. Microstructural changes with aging decreased the capacity for near-tip inelastic deformation and microcracking of the tubules, which in turn suppressed the formation of unbroken ligaments and the degree of extrinsic toughening.
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Affiliation(s)
- A Nazari
- Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD 21250, United States
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Check JH, Swenson K, Yuan W, Nazari A. Effect of the degree of fragmentation on embryo survival after freeze-thawing. CLIN EXP OBSTET GYN 2009; 36:216. [PMID: 20101850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
PURPOSE To determine if the degree of fragmentation of embryos prior to freezing correlate in a negative manner with survival after thawing. METHODS A retrospective review of frozen embryos thawed for purposes of embryo transfer was done. Survival and transferability rates were determined according to degree of fragmentation. RESULTS The chance that an embryo with < 25% fragmentation was deemed good enough for transfer upon thawing was 63.6% compared to 52.8% for embryos > 25% (p < .05). CONCLUSIONS Though more fragmented embryos have a lower survival rate after freeze thawing, about 50% of embryos with > 25% fragmentation will still survive the thaw and be able to be transferred.
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Affiliation(s)
- J H Check
- The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, Cooper Hospital/University Medical Center Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology & Infertility, Camden, NJ, USA.
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Hekmatshoar R, Beheshtiha SYS, Nazari A, Faridbod F. Synthesis and Absorption Properties of Some 4-Mercapto-1,8-naphthalimides, 4-Mercapto-7H-benzimidazo[2,1-a]benz[d,e] Isoquinolin-7-one, and 4-Mercapto-7H-benzimidazo [2,1-a]Benz[d, e]isoquinoline-7-one. PHOSPHORUS SULFUR 2007. [DOI: 10.1080/10426500500269497] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- R. Hekmatshoar
- a Department of Chemistry , Alzahra University , Vanak, Tehran, Iran
| | | | - A. Nazari
- a Department of Chemistry , Alzahra University , Vanak, Tehran, Iran
| | - F. Faridbod
- a Department of Chemistry , Alzahra University , Vanak, Tehran, Iran
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Wiesak T, Nazari A, Summers-Chase D, Horwath D, Check J. A Comparison of Efficacy of Freezing Embryos at the 2 Pronuclear (2PN) Stage vs. Multi-Cell When Using a Simplified Freezing Protocol With One-Step Removal of Cryoprotectant. Fertil Steril 2005. [DOI: 10.1016/j.fertnstert.2005.07.756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Katsoff B, Nazari A, Check J, Wilson C, Choe J, Krotec J. The Effect of the Length of the Follicular Phase on Pregnancy Outcome Following Single Embryo Transfer (ET) in Hypergonadotropic Women. Fertil Steril 2005. [DOI: 10.1016/j.fertnstert.2005.07.853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Check JH, Choe JK, Katsoff B, Krotec JW, Nazari A. Ectopic pregnancy is not more likely following fresh vs frozen embryo transfer. CLIN EXP OBSTET GYN 2005; 32:95-6. [PMID: 16108389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
PURPOSE To determine if the risk of ectopic pregnancy is greater following frozen vs fresh embryo transfer (ET). METHODS Retrospective review of pregnancy outcome from January 1, 1997 to November 30, 2003. Cryopreservation was used as a simple freezing method and one-step removal of cryoprotectant. The cycles consisted mostly of graduated estradiol and progesterone supplementation. RESULTS The ectopic pregnancy rate in 1,445 clinical pregnancies from fresh ET was 2.6% vs 2.0% of 975 clinical pregnancies resulting from frozen ET. CONCLUSION In contrast to the conclusions of two previous studies, the present study evaluating twice as many clinical pregnancies than the two aforementioned studies combined failed to show any greater risk of ectopic pregnancy when transfers were performed on day 3.
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Affiliation(s)
- J H Check
- The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, Camden, NJ, USA
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Check JH, Dietterich C, Nazari A, Lurie D, Choe JK, Check ML. Non-homogeneous hyperechogenic echo pattern three days after frozen embryo transfer is associated with lower pregnancy rates. CLIN EXP OBSTET GYN 2005; 32:15-8. [PMID: 15864928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
OBJECTIVE To evaluate the association of mid-luteal phase echo patterns and pregnancy rates (PRs) following frozen embryo transfer (ET). METHODS Sonographic evaluation of endometrial echo patterns was performed three days after ET in the first frozen ET cycle of women < 40 years of age who used their own oocytes as well as all donor oocyte recipients. RESULTS The distribution of echo patterns and clinical PRs were similar in women using their own eggs and women who used donor oocytes; therefore all data was combined. The clinical PR was 49.5% with a hyperechogenic echo pattern vs 38.8% with a non-hyperechogenic pattern, p = .007. CONCLUSION A larger study of frozen ET and mid-luteal echo pattern now demonstrates conclusions similar to the data from fresh ET in hyperstimulated in vitro fertilization (IVF)-ET cycles in that failure to attain a hyperechogenic echo pattern three days after ET is associated with lower pregnancy rates.
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Affiliation(s)
- J H Check
- The University of Medicine and Dentistry of New Jersey Robert Wood Johnson Medical School at Camden, Cooper Hospital/University Medical Center, Department of Obstetrics and Gynecology, USA
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Boskabady MH, Khatami A, Nazari A. Possible mechanism(s) for relaxant effects of Foeniculum vulgare on guinea pig tracheal chains. Pharmazie 2004; 59:561-4. [PMID: 15296096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
In a previous study the relaxant (bronchodilatory) effect of Foeniculum vulgare on isolated guinea pig tracheal chains was demonstrated. To study mechanisms responsible for this effect the present study evaluated the inhibitory effect of this plant on contracted tracheal chains of guinea pig. The relaxant effects of aqueous and ethanol extracts and an essential oil from Foeniculum vulgare were compared to negative controls (saline for aqueous extract and essential oil and ethanol for ethanol extract) and a positive control (diltiazem) using isolated tracheal chains of the guinea pig precontracted by 10 microM methacholine (group 1) and 60 mM KCl (group 2, n = 7 for each group). In the group 1, experiments diltiazem, ethanol extract, and essential oil from Foeniculum vulgare showed a significant relaxant effect on methacholine induced contraction of tracheal chains compared to those of negative controls (p < 0.05 to p < 0.001). In addition the effect of the ethanol extract was significantly greater than that of diltiazem (p < 0.001). However, the aqueous extract did not show any relaxant effect in group 1. In the group 2 experiments, only diltiazem showed a significant relaxant effect on KCl induced contraction of tracheal chains (p < 0.001). The relaxant effects of ethanol extracts and essential oil obtained in the group 2 experiments were significantly lower than those in group 1 (p < 0.05 to p < 0.001). These results confirm the bronchodilatory effects of ethanol extract and essential oil from Foeniculum vulgare. However with regard to the effect of KCl on calcium channels, the results indicated that the inhibitory effect of ethanol extracts and essential oil from Foeniculum vulgare on calcium channels is not contributing to their relaxant (bronchodilatory) effects on guinea pig tracheal chains. However the results suggest a potassium channel opening effect for this plant, which may contribute on its relaxant effect on guinea pig tracheal chains.
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Affiliation(s)
- M H Boskabady
- Department of Physiology, Ghaem Medical Centre, Mashhad University of Medical Sciences, Mashhad, Iran.
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Check JH, Graziano V, Lee G, Nazari A, Choe JK, Dietterich C. Neither sildenafil nor vaginal estradiol improves endometrial thickness in women with thin endometria after taking oral estradiol in graduating dosages. CLIN EXP OBSTET GYN 2004; 31:99-102. [PMID: 15266759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
PURPOSE To determine if sildenafil improves endometrial thickness better than vaginal estradiol (E2) in women with a history of thin endometria. METHODS Women failing to attain an 8 mm endometrial thickness on either the oocyte retrieval cycle or their first frozen embryo transfer (ET) despite an oral graduated E2 regimen were treated again with graduated oral E2 and were also randomly assigned to vaginal sildenafil or vaginal E2 therapy. Endometrial thickness was compared between the groups. RESULTS Neither vaginal E2 nor sildenafil significantly improved endometrial thickness or blood flow in the subsequent frozen ET-cycle. CONCLUSIONS These data fail to corroborate previous claims that 25 mg sildenafil four times daily intravaginally can improve endometrial thickness.
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Affiliation(s)
- J H Check
- The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, Cooper/Hospital University Medical Center, USA
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Check JH, Summers-Chase D, Nazari A, Kiefer D, Swenson K. The importance of number of blastomeres when embryos are transferred in the absence of controlled ovarian hyperstimulation. CLIN EXP OBSTET GYN 2003; 29:257-8. [PMID: 12643229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
PURPOSE To determine if the previous findings that transferring embryos with a higher number of blastomeres results in higher pregnancy rates following fresh but not frozen embryo transfer (ET) was related to the use of controlled ovarian hyperstimulation (COH) in the former but not in the latter. METHODS Retrospective review of pregnancy and implantation rates following fresh embryo transfer of donor egg recipient cycles (where no COH is used) vs frozen ETs during the same time period according to whether there was at least one embryo with eight blastomeres transferred or not. RESULTS Significantly higher pregnancy rates with an 8-cell ET in donor oocyte recipient cycles but not frozen ETs. CONCLUSIONS A less favorable uterine environment caused by the use of high dose gonadotropin is not responsible for the once again observed difference in higher pregnancy rates with higher blastomere number in fresh vs frozen ET. However, an effect of the gonadotropin releasing hormone analogue was not ruled out by this study.
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Affiliation(s)
- J H Check
- The University of Medicine and Dentistry of New Jersey, Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology & Infertility, Camden, New Jersey, USA
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Check J, Katsoff D, Wilson C, Nazari A, Krotec J. A comparison of pregnancy rates following in vitro fertilization in poor responders according to two different low-dose regimens of using leuprolide acetate in conjunction with gonadotropins. Fertil Steril 2003. [DOI: 10.1016/s0015-0282(03)00097-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Check J, Nazari A, Wilson C, Choe J, Krotec J. An evaluation of outcome following in vitro fertilization after no or minimal stimulation with gonadotropin without gonadotropin releasing hormone agonists or antagonists in previous poor responders or women with hypergonadotropism. Fertil Steril 2003. [DOI: 10.1016/s0015-0282(03)00099-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Check ML, Check JH, Summers-Chase D, Choe JK, Check DJ, Nazari A. Live birth after posthumous testicular sperm aspiration and intracytoplasmic sperm injection with cryopreserved sperm: case report. CLIN EXP OBSTET GYN 2003; 29:95-6. [PMID: 12171326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
PURPOSE To determine if a viable pregnancy is possible after aspiration of sperm from the testes of a man several hours after his death. METHOD Following cryopreservation of the aspirated sperm, in vitro fertilization (IVF)-embryo transfer (ET) with intracytoplasmic sperm injection (ICSI) was used. The sperm selected were either those with motility or plumper non-motile sperm. RESULTS Fertilization of oocytes and ET occurred following all five IVF-ET cycles. A clinical pregnancy was achieved in cycle 1 with non-motile sperm and a viable pregnancy resulted from cycle 5 with ICSI performed with viable sperm. CONCLUSION Viable pregnancies following IVF-ET and ICSI are possible even when using testicular sperm obtained posthumously.
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Affiliation(s)
- M L Check
- The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, Cooper Hospital/University Medical Center, Department of Obstetrics and Gynecology, New Jersey, USA
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Graham K, Mohammad N, Rehman H, Nazari A, Ahmad M, Kamal M, Skovmand O, Guillet P, Allan R, Zaim M, Yates A, Lines J, Rowland M. Insecticide-treated plastic tarpaulins for control of malaria vectors in refugee camps. Med Vet Entomol 2002; 16:404-408. [PMID: 12510893 DOI: 10.1046/j.1365-2915.2002.00395.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Spraying of canvas tents with residual pyrethroid insecticide is an established method of malaria vector control in tented refugee camps. In recent years, plastic sheeting (polythene tarpaulins) has replaced canvas as the utilitarian shelter material for displaced populations in complex emergencies. Advances in technology enable polythene sheeting to be impregnated with pyrethroid during manufacture. The efficacy of such material against mosquitoes when erected as shelters under typical refugee camp conditions is unknown. Tests were undertaken with free-flying mosquitoes on entomological study platforms in an Afghan refugee camp to compare the insecticidal efficacy of plastic tarpaulin sprayed with deltamethrin on its inner surface (target dose 30 mg/m2), tarpaulin impregnated with deltamethrin (initially > or = 30 mg/m2) during manufacture, and a tent made from the factory impregnated tarpaulin material. Preliminary tests done in the laboratory with Anopheles stephensi Liston (Diptera: Culicidae) showed that 1-min exposure to factory-impregnated tarpaulins would give 100% mortality even after outdoor weathering in a temperate climate for 12 weeks. Outdoor platform tests with the erected materials (baited with human subjects) produced mosquito mortality rates between 86-100% for sprayed or factory-impregnated tarpaulins and tents (average approximately 40 anophelines and approximately 200 culicines/per platform/night), whereas control mortality (with untreated tarpaulin) was no more than 5%. Fewer than 20% of mosquitoes blood-fed on human subjects under either insecticide-treated or non-treated shelters. The tarpaulin shelter was a poor barrier to host-seeking mosquitoes and treatment with insecticide did not reduce the proportion blood-feeding. Even so, the deployment of insecticide-impregnated tarpaulins in refugee camps, if used by the majority of refugees, has the potential to control malaria by killing high proportions of mosquitoes and so reducing the average life expectancy of vectors (greatly reducing vectorial capacity), rather than by directly protecting refugees from mosquito bites. Mass coverage with deltamethrin-sprayed or impregnated tarpaulins or tents has strong potential for preventing malaria in displaced populations affected by conflict.
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Affiliation(s)
- K Graham
- HealthNet International, Peshawar, Pakistan
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Choe JK, Nazari A, Check JH, Summers-Chase D, Swenson K. Marked improvement in clinical pregnancy rates following in vitro fertilization-embryo transfer seen when transfer technique and catheter were changed. CLIN EXP OBSTET GYN 2002; 28:223-4. [PMID: 11838743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
PURPOSE To compare in vitro fertilization (IVF) outcome with two different embryo transfer (ET) catheters: the Frydman and Wallace catheters. METHODS Retrospective review of outcome of IVF cycles where there was at least one embryo that had assisted hatching prior to transfer at 72 hours according to which catheter was used. RESULTS Pregnancy rate 17.6% per transfer with Frydman (FET-SET) vs 44.2% for fresh ETs and 15.4% and 43.2% for frozen ETs. The implantation rates for fresh ETs were 7.6% vs 20.0% for fresh and 5.7 vs 21.1% for frozen ETs. CONCLUSION The soft Wallace catheter is superior to the stiffer Frydman catheter when transferring embryos subjected to assisted embryo hatching.
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Affiliation(s)
- J K Choe
- The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, Cooper Hospital/University Medical Center, Department of Obstetrics and Gynecology, USA
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Check J, Choe J, Wilson C, Nazari A. A proposal to evaluate pregnancy rates (PRs) following in vitro fertilization-embryo transfer (IVF-ET) in a novel way to be fair to programs emphasizing cryopreservation and doing limited embryo deselection. Fertil Steril 2002. [DOI: 10.1016/s0015-0282(02)03039-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Lurie D, Check JH, Nazari A, Choe JK, Lee G. Cumulative pregnancy rates after four embryo transfers of either fresh or frozen embryos. CLIN EXP OBSTET GYN 2002; 28:148-52. [PMID: 11530861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
PURPOSE To evaluate in the modern era of in vitro fertilization (IVF) cumulative probability of pregnancy for the first four embryo transfers (ET) irrespective of whether the embryos were fresh or frozen. METHODS Retrospective review over a 2 1/2 year period. Cumulative probability of pregnancy for four consecutive cycles of either fresh or frozen ETs divided into four age groups. RESULTS The cumulative clinical and viable pregnancy rates after four ETs were 92% and 88%; 87% and 82%; 83% and 69%; and 68% and 52% for age groups <30, 30-34, 35-39, and 40-44. The cumulative rates decline with age. CONCLUSIONS Pregnancy rates per transfer for the first four ETs regardless of age are similar even in IVF centers that emphasize frozen ETs.
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Affiliation(s)
- D Lurie
- The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, USA
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Check JH, Wilson C, Summers-Chase D, Choe JK, Nazari A, Lurie D. Pregnancy rates (prs) according to embryo cell number at time of embryo transfer (ET). CLIN EXP OBSTET GYN 2002; 28:73-7. [PMID: 11491377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
PURPOSE To evaluate pregnancy and implantation rates following fresh and frozen embryo transfer (ET) according to blastomere number. METHODS A retrospective study from 1/1/97 to 9/30/98 including all cycles with ETs irrespective of age. RESULTS 65% of fresh transfers had at least one 8-cell embryo vs only 39.6% for frozen ET. The clinical pregnancy and implantation rates were higher when one 8-cell embryo was transferred (64% and 24%) vs a 5-7 cell embryo (41% and 14.5%) for fresh transfers. There was less of a difference with frozen ETs (46% and 19% for 8-cell vs 38% and 17% for 5-7 cell). CONCLUSIONS Since mostly only 8-cell embryos at day 3 reach the blastocyst stage, these data raise questions as to whether the quest to attain the highest pregnancy rate per transfer through blastocyst transfer, may be at the expense of overall pregnancy rate (fresh and frozen) from a given oocyte harvest.
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Affiliation(s)
- J H Check
- The University of Medicine and Dentistry of New Jersey Robert Wood Johnson Medical School at Camden, Copper Hospital/University Medical Center, Department of Obstetrics and Gynecology, USA
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Check JH, Choe JK, Nazari A, Fox F, Swenson K. Fresh embryo transfer is more effective than frozen for donor oocyte recipients but not for donors. Hum Reprod 2001; 16:1403-8. [PMID: 11425820 DOI: 10.1093/humrep/16.7.1403] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Recipients of donor oocytes need to be synchronized to the donor's cycle if fresh embryos are to be transferred on the cycle of oocyte retrieval. It would be much easier to merely retrieve the oocytes from the donor, fertilize the oocytes with the recipient's male partner's spermatozoa, cryopreserve the embryos, then transfer on an oestrogen/progesterone treatment programme. METHODS The IVF outcomes of all patients enrolled in a shared oocyte programme from January 1997 to June 1999 were reviewed. Pregnancy and implantation rates were computed and statistically analysed. RESULTS There was a significantly higher clinical pregnancy rate for recipients who had a fresh embryo transfer compared with recipients whose first embryo transfer consisted of frozen/thawed embryos (63.4 versus 43.6%). CONCLUSIONS Conception is more likely after fresh than frozen embryo transfer with recipients but is similar to donor conception rates. If a uterine defect, per se, even without the use of the controlled ovarian stimulation regimen, could explain the difference between fresh pregnancy and implantation rates in donors versus recipients, then these same differences would have been seen when comparing frozen transfers, but they were, in fact, similar.
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Affiliation(s)
- J H Check
- The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, Department of Obstetrics and Gynecology, Camden, NJ, USA.
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Dietterich C, Check JH, Choe JK, Nazari A, Fox F. The presence of small uterine fibroids not distorting the endometrial cavity does not adversely affect conception outcome following embryo transfer in older recipients. CLIN EXP OBSTET GYN 2001; 27:168-70. [PMID: 11214940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
PURPOSE To determine if uterine fibroids have a negative impact in older patients having embryo transfer (ET). METHODS Comparison of clinical and viable pregnancy rates, implantation rates, and spontaneous abortion rates in older (>35) oocyte or embryo recipients with uterine leiomyomata compared to comparable patients without fibroids. RESULTS The clinical pregnancy rate per transfer was 56% in the fibroid group vs 64% for the controls. Implantation rates were also very similar (33 vs 32%7). There were no spontaneous abortion or preterm deliveries <32 weeks in the fibroid group and the average term of pregnancies was also similar. CONCLUSION Small fibroids not distorting the uterine cavity do not seem to negatively affect conception outcome even in older women.
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Affiliation(s)
- C Dietterich
- The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden Cooper Hospital/University Medical Center, Department of Obstetrics and Gynecology, Camden, USA
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Check JH, Choe JK, Nazari A, Summers-Chase D. Ovarian hyperstimulation can reduce uterine receptivity. A case report. CLIN EXP OBSTET GYN 2001; 27:89-91. [PMID: 10968340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Affiliation(s)
- J H Check
- The University of Medicine anld Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, Cooper Hospital/University Medical Center, Department of Obstetrics and Gynecology, USA
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Check JH, Summers D, Nazari A, Choe J. Successful pregnancy following in vitro fertilization-embryo transfer despite imminent ovarian failure. CLIN EXP OBSTET GYN 2001; 27:97-9. [PMID: 10968343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
There have been previously published several anecdotal cases of women in apparent or imminent ovarian failure who subsequently ovulated and became pregnant. Many of these women had been treated with estrogen. A series of cases were reported where women with hypergonadotropic hypogonadism who failed to stimulate despite gonadotropin therapy were able to ovulate when treated with pharmacologic doses of estrogen alone or in combination with human menopausal gonadotropins. Presented herein is a case of a woman with imminent ovarian failure with tubal disease who failed to stimulate with gonadotropins alone but was successful with estrogen and gonadotropins. We believe this is the first successful case of hypergonadotropic hypogonadism to conceive by in vitro fertilization.
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Affiliation(s)
- J H Check
- The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, Cooper Hospital/University Medical Center, Department of Obstetrics and Gynecology, USA
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Dietterich C, Check JH, Lurie D, Choe JK, Nazari A. A study to determine if certain sonographic uterine parameters are associated with multiple gestation. Gynecol Obstet Invest 2001; 50:242-6. [PMID: 11093046 DOI: 10.1159/000010324] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The objective was to determine if lower uterine artery vascular impedance is associated with a greater likelihood of multiple gestation. Color Doppler parameters of pulsatility index, resistance index, endometrial thickness and echo patterns were measured in oocyte/retrieval cycles on days of human chorionic gonadotropin injection, oocyte retrieval, and mid-luteal phase in cycles where at least 3 embryos were transferred. Comparisons of these parameters were made in patients with single versus multiple gestations. There was no association between uterine environment as measured by vascular impedance and endometrial thickness and number of embryos implanted. Thus, a more ideal uterine environment, at least as determined by these sonographic parameters, does not seem to facilitate multiple embryo implantations.
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Affiliation(s)
- C Dietterich
- The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, NJ, USA
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Abstract
A study was conducted to determine if uterine vascular impedance increases with advancing age in women undergoing ovarian stimulation for IVF. A group of 162 women who had undergone conventional IVF and embryo transfer was subdivided into three subgroups by age: 30-34 years (n = 49), 35-39 years (n = 79) and 40-44 years (n = 34). The pulsatility index (PI) and resistance index (RI) of the right and left uterine arteries were measured at baseline, on the day of oocyte retrieval, and at the mid-luteal phase. There were no differences in the average PI or RI by age at any phase of the cycle. In all age groups, the luteal phase values of PI and RI were lower than those observed earlier in the cycle. Endometrial thickness was not associated with age. There was no significant correlation between PI, RI and serum oestradiol and progesterone concentrations at any phase of the cycle. Ovarian response, as measured by average number of oocytes retrieved, decreased significantly with age. Thus, reduced pregnancy rates in older women undergoing ovarian stimulation are more likely to occur because of oocyte quality and quantity rather than uterine senescence. If future studies determine that the use of ovarian stimulation does decrease implantation rates more in older versus younger women, a mechanism other than increased uterine vascular impedance must be sought.
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Affiliation(s)
- J H Check
- The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, Cooper Hospital/University Medical Center, USA.
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Check JH, Choe JK, Nazari A. Hyperreactio luteinalis despite the absence of a corpus luteum and suppressed serum follicle stimulating concentrations in a triplet pregnancy. Hum Reprod 2000; 15:1043-5. [PMID: 10783348 DOI: 10.1093/humrep/15.5.1043] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Hyperreactio luteinalis is characterized by moderate to marked cystic enlargement of the ovaries related to multiple theca lutein cysts and is associated with very high sex steroid concentrations. It is a rare condition especially in the first trimester. The case described below is believed to be the only case of hyperreactio luteinalis reported following frozen embryo transfer. This case provides an opportunity to gain further insight into the mechanism responsible for this unusual condition. The 30 year old woman demonstrated a slightly elevated LH/FSH ratio (5 and 3 mIU/ml respectively) and normal baseline androgen concentrations. Two years following oocyte retrieval she had a second frozen embryo transfer. The ovaries were normal size when the embryos were transferred and androgens were still normal. The ovaries did not begin to enlarge until 51 days from transfer. A dichorionic intrauterine pregnancy with monozygotic twins in the left gestational sac was seen. Eventually, 86 days from transfer, the ovaries enlarged to 145x103x116 mm right; and 83x95x117 mm left. Serum oestradiol was 30 078 pg/ml, beta-human chorionic gonadotrophin (HCG) 239 920 mIU/ml, serum progesterone >160 ng/ml, total testosterone 2254 ng/dl, free testosterone 42.3 pg/ml and androstenedione 7328 ng/dl. Throughout the first trimester, serum FSH was <1 mIU/ml. Thus, neither FSH nor a corpus luteum is necessary to initiate this syndrome.
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Affiliation(s)
- J H Check
- The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, New Jersey, USA
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Lurie D, Check J, Nazari A, Choe J. Pregnancy rates (prs) per cycle similar for the first four transfers despite improved prs. Fertil Steril 2000. [DOI: 10.1016/s0015-0282(00)00442-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Check J, Nazari P, Nazari A, Choe J, Liss J. Prognosis following in vitro fertilization-embryo transfer (ivf-et) in patients with elevated day 2 or 3 serum-follicle stimulating hormone (fsh) is better in younger vs. older patients. Fertil Steril 2000. [DOI: 10.1016/s0015-0282(00)00457-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Check M, Summers-Chase D, Check JH, Choe J, Nazari A. Sperm extracted and cryopreserved from testes several hours after death results in pregnancy following frozen embryo transfer: case report. Arch Androl 1999; 43:235-7. [PMID: 10624508 DOI: 10.1080/014850199262553] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
A 38-year-old male died suddenly on his honeymoon. Sperm was extracted from his testes 3 h following his death and cryopreserved. His wife had in vitro fertilization (IVF) and the eggs were inseminated by intracytoplasmic sperm injection (ICSI). None of the sperm were motile. Selection was based on softness and pliability. There were 4 embryos formed that cleaved, but only 2 were transferred on the retrieval cycle. The wife failed to conceive, but then had a second transfer of the 2 cryopreserved embryos. She achieved a chemical pregnancy with the beta-human chorionic gonadotropin level attaining a maximum level of 107 mIU/mL (rising from 19 mIU/mL). Though this retrieval cycle did not result in a successful pregnancy the achievement of a clinical pregnancy following frozen embryo transfer at least provides cautious optimism for other cases with similar conditions.
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Affiliation(s)
- M Check
- University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, Cooper Hospital/University Medical Center, Department of Obstetrics and Gynecology, USA
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Check J, Choe J, Nazari A. R-145. A comparison of spontaneous abortion rates in women with asymptomatic versus symptomatic subchorionic haematomas during the first trimester. Hum Reprod 1999. [DOI: 10.1093/humrep/14.suppl_3.343-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Check J, Choe J, Nazari A, Bredin S. P-10 Hyperreactio luteinalis despite the absence of a corpus luteum and suppressed follicle stimulating hormone (FSH) levels. Fertil Steril 1999. [DOI: 10.1016/s0015-0282(99)00045-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Check J, Summers-Chase D, Swenson K, Nazari A, Choe J. P-11 Higher pregnancy rates (PRs) following transfer of thawed embryos cryopreserved at the 2 pronuclear (2PN) stage compared to multi-CeU stage-possible influence of selection. Fertil Steril 1999. [DOI: 10.1016/s0015-0282(99)00046-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Check JH, Dietterich C, Lurie D, Nazari A, Chuong J. A matched study to determine whether low-dose aspirin without heparin improves pregnancy rates following frozen embryo transfer and/or affects endometrial sonographic parameters. J Assist Reprod Genet 1998; 15:579-82. [PMID: 9866064 PMCID: PMC3454856 DOI: 10.1023/a:1020373009043] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
PURPOSE The objective of the matched, controlled study was to determine whether low-dose aspirin therapy without heparin improves pregnancy rates following frozen embryo transfer. METHODS Thirty-six women who did not achieve a pregnancy following fresh embryo transfer and who had frozen embryos available for another transfer were included. Eighteen women were treated with 81 mg aspirin from day 2 of the cycle through pregnancy testing. If the beta-human chorionic gonadotropin level was positive, aspirin was continued through the pregnancy. Eighteen women were not given aspirin. The mean outcome variables were pregnancy and implantation rates. RESULTS The clinical pregnancy rate in the aspirin group was 11.1%, compared with 33.3% for the controls, and implantation rates were 2.9 and 10.9%, respectively. CONCLUSIONS No positive effects of low-dose aspirin therapy on pregnancy rates following frozen embryo transfer were observed.
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Affiliation(s)
- J H Check
- University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, Camden, New Jersey, USA
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Abstract
OBJECTIVE To compare clinical pregnancy and implantation rates after transfer of frozen-thawed embryos prepared according to an assisted hatching protocol or a nonassisted hatching protocol. DESIGN A historical cohort study in which a cohort of patients who underwent an assisted hatching protocol was matched for clinical parameters to an external historical cohort treated before assisted hatching was available. SETTING In vitro fertilization-ET facility of a university-based practice. PATIENTS Seventy-nine matched pairs. INTERVENTIONS Nonassisted hatching patients: embryos were thawed, cultured in human tubal fluid + 0.5% bovine serum albumin until 48 hours and transferred. Assisted hatching patients: embryos thawed, cultured in human tubal fluid + 10% synthetic serum substitute until 72 hours, had assisted hatching and transferred. MAIN OUTCOME MEASURES Clinical pregnancy (gestational sac) and implantation rates. RESULTS Twelve (15.2%) clinical pregnancies per transfer in nonhatched group versus 24 (30.4%) in hatched group. Nonhatched group: 284 embryos transferred; 15 (5.3%) implanted. Three pregnancies (25.0%) had two sacs. Hatched embryos: 269 were transferred; 37 (13.7%) implanted. Eleven pregnancies (45.8%) were multiple gestations (9 twins, 2 triplets). CONCLUSION Clinical pregnancy and implantation rates were higher for group having assisted hatching protocol. It is not clear whether the improvement is due to the overall methodology change or to assisted hatching. Assisted hatching using the zona-drilling technique is not detrimental to frozen-thawed human embryos and may be beneficial.
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Affiliation(s)
- J H Check
- Department of Obstetrics and Gynecology, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, Cooper Hospital, USA
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