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Ouederni M, Maamouri R, Sassi H, Nouri S, Cheour M. [Multimodal imaging in the diagnosis of retinal capillary hemangioblastoma]. J Fr Ophtalmol 2021; 44:912-914. [PMID: 33875238 DOI: 10.1016/j.jfo.2020.10.020] [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] [Received: 09/14/2020] [Accepted: 10/05/2020] [Indexed: 11/16/2022]
Affiliation(s)
- M Ouederni
- Université Tunis El Manar, faculté de médecine de Tunis, hôpital Habib-Thameur, 3, rue A. Ben Ayed, 1089 Tunis, Tunisie.
| | - R Maamouri
- Université Tunis El Manar, faculté de médecine de Tunis, hôpital Habib-Thameur, 3, rue A. Ben Ayed, 1089 Tunis, Tunisie
| | - H Sassi
- Université Tunis El Manar, faculté de médecine de Tunis, hôpital Habib-Thameur, 3, rue A. Ben Ayed, 1089 Tunis, Tunisie
| | - S Nouri
- Université Tunis El Manar, faculté de médecine de Tunis, hôpital Habib-Thameur, 3, rue A. Ben Ayed, 1089 Tunis, Tunisie
| | - M Cheour
- Université Tunis El Manar, faculté de médecine de Tunis, hôpital Habib-Thameur, 3, rue A. Ben Ayed, 1089 Tunis, Tunisie
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Touati A, Nouri S, Halleb Y, Kmiha S, Mathlouthi J, Tej A, Mahdhaoui N, Ben Ahmed A, Saad A, Bensignor C, H’mida Ben Brahim D. Additional Tunisian patients with Sanjad–Sakati syndrome: A review toward a consensus on diagnostic criteria. Arch Pediatr 2019; 26:102-107. [DOI: 10.1016/j.arcped.2018.11.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Revised: 10/18/2018] [Accepted: 11/17/2018] [Indexed: 12/23/2022]
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Nouri S, Hosseini Pooya2 S, Soltani Nabipour J. Comparative Analysis of Neural Network Training Methods in Real-time Radiotherapy. J Biomed Phys Eng 2017; 7:51-58. [PMID: 28451579 PMCID: PMC5401133] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 03/10/2016] [Indexed: 10/28/2022]
Abstract
BACKGROUND The motions of body and tumor in some regions such as chest during radiotherapy treatments are one of the major concerns protecting normal tissues against high doses. By using real-time radiotherapy technique, it is possible to increase the accuracy of delivered dose to the tumor region by means of tracing markers on the body of patients. OBJECTIVE This study evaluates the accuracy of some artificial intelligence methods including neural network and those of combination with genetic algorithm as well as particle swarm optimization (PSO) estimating tumor positions in real-time radiotherapy. METHOD One hundred recorded signals of three external markers were used as input data. The signals from 3 markers thorough 10 breathing cycles of a patient treated via a cyber-knife for a lung tumor were used as data input. Then, neural network method and its combination with genetic or PSO algorithms were applied determining the tumor locations using MATLAB© software program. RESULTS The accuracies were obtained 0.8%, 12% and 14% in neural network, genetic and particle swarm optimization algorithms, respectively. CONCLUSION The internal target volume (ITV) should be determined based on the applied neural network algorithm on training steps.
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Affiliation(s)
- S. Nouri
- Department of Physics, Faculty of Basic Sciences, Islamic Azad University, Central Tehran Branch, Iran
| | - S.M. Hosseini Pooya2
- Radiation Application Research School, Nuclear Science & Technology Research Institute, AEOI, Tehran, Iran
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Nouri S, Haghseresht F. Adsorption of Dissociating Aromatic Compounds by Activated Carbon: Effects of Ionization on the Adsorption Capacity. ADSORPT SCI TECHNOL 2016. [DOI: 10.1260/02636170260295588] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
The adsorption of three dissociating aromatic compounds on an untreated commercially available activated carbon was investigated systematically. All adsorption experiments were carried out in pH-controlled aqueous solutions. The experimental isotherms were analyzed using the homogeneous Langmuir model. The effects of surface heterogeneity were investigated via the theory of localized physical adsorption, using the Langmuir equation as the local isotherm equation and assuming a Gaussian adsorption energy distribution. A new method of utilizing the extracted parameters from the homogeneous and heterogeneous models is presented. This new approach provided a better understanding of the change in monolayer capacity and other adsorption characteristics of a carbon/solute system with pH.
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Affiliation(s)
- S. Nouri
- Chemistry Department, College of Science, Urmia University, Urmia 57135-165, Iran
| | - Fouad Haghseresht
- Department of Chemical Engineering, University of Queensland, Brisbane 4072, Queensland, Australia
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Tabatabaei F, Razzaghi R, Soleimani Z, Nouri S. The risk factors of hearing loss in diabetes mellitus. J Res Med Den Sci 2016. [DOI: 10.5455/jrmds.20164410] [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: 11/03/2022] Open
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Nouri S, Sharif MR, Afzali H, Sharif A, Satkin M. The Advantages and Disadvantages of Methods Used to Control Liver Bleeding: A Review. Trauma Mon 2015; 20:e28088. [PMID: 26839866 PMCID: PMC4727474 DOI: 10.5812/traumamon.28088] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 08/15/2015] [Accepted: 08/17/2015] [Indexed: 01/22/2023] Open
Abstract
Context: Despite advancements in the science of surgery, minimizing bleeding from parenchymal tissue of the liver continues to be one of the challenges surgeons are facing to protect patients’ lives. However, the number of surgeries needing incisions in the liver tissue, e.g. metastatectomy, is constantly increasing. Evidence Acquisition: A MEDLINE and conventional search of the past 50 years of the medical literature was performed to identify relevant articles on hemostasis in the liver parenchymal tissue. Results: The studies that have been published on hemostasis in the liver parenchymal tissue can be classified into 3 categories: 1. surgical procedures; 2. methods affecting body hemodynamic; 3. pharmacological methods. The purpose of these studies are to identify the best therapeutic approaches that not only minimize the bleeding, but also save the maximum amount of the liver tissue and minimize the use of partial liver resections. Conclusions: The excessive blood loss and the long time needed to control the bleeding during liver surgery impose several side effects and complications on patients. Topical hemostatic agents such as ferric chloride, potassium aluminum sulfate (alum) and aluminum chloride are safely applicable in patients. These agents might be used along with other current methods to minimize the blood loss and the need for blood products during liver surgeries.
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Affiliation(s)
- Saeed Nouri
- Department of Neurology, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran
| | - Mohammad Reza Sharif
- Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran
- Corresponding author: Mohammad Reza Sharif, Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran. Tel: +98-9123788713, Fax: +98-3615558900, E-mail:
| | - Hasan Afzali
- Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran
| | - Alireza Sharif
- Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran
| | - Mojtaba Satkin
- Behavioral Sciences Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
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Abstract
Abstract
Chain architecture is an influential parameter in melt processing of polymeric material. In this study effect of different chain structures on polylactide (PLA) film blowing process and on the final film properties was investigated. Blends of linear PLA with three branched poly(L-lactide)s with 4-arms star shaped, comb like and hyper branched structures were prepared by twin screw extruder. In another series of blending, poly(D-lactide) of these branched structures were used to obtain stereocomplex crystal. Operating window of blends were determined in a series of film blowing process experiments with different blow up and take up ratio and results were compared to linear PLA as a reference. Moreover, different characterization techniques were applied to determine the properties of produced films. It was found that addition of branched architecture and presence of stereocomplex in a linear PLA matrix result in a greater operating window for film blowing and improve mechanical and crystallization properties of blown films.
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Affiliation(s)
- S. Nouri
- CREPEC , Chemical Engineering Department, Ecole Polytechnique, Montreal, QC , Canada
| | - P. G. Lafleur
- CREPEC , Chemical Engineering Department, Ecole Polytechnique, Montreal, QC , Canada
| | - C. Dubois
- CREPEC , Chemical Engineering Department, Ecole Polytechnique, Montreal, QC , Canada
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Nouri S, Sharif MR, Panahi Y, Ghanei M, Jamali B. Efficacy and safety of aluminum chloride in controlling external hemorrhage: an animal model study. Iran Red Crescent Med J 2015; 17:e19714. [PMID: 25964855 PMCID: PMC4417476 DOI: 10.5812/ircmj.19714] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 01/27/2015] [Accepted: 02/17/2015] [Indexed: 11/28/2022]
Abstract
Background: Despite all the progress in surgical science, bleeding caused by traffic accidents is still one of the challenges surgeons face in saving patients’ lives. Therefore, introducing an effective method to control external bleeding is an important research priority. Objectives: This study aimed to compare the hemostatic effect of aluminum chloride versus simple suturing in controlling external bleeding. Materials and Methods: This experimental study was conducted in Kashan, Iran. In this study, 60 male Wistar rats were randomly allocated into six groups. An incision, two centimeters (cm) long and half a cm deep, was made on each rat’s shaved back skin and the hemostatic time was measured once using aluminum chloride with different concentrations (5%, 10%, 15%, 25%, and 50%) and then using the control method (controlling hemorrhage by simple suturing). The skin tissue was assessed for pathological changes. Results: The hemostatic time of aluminum chloride 50%, 25%, 15%, 10% and 5% were 8.20 ± 0.919, 14.10 ± 1.37, 21.20 ± 1.31, 30.80 ± 1.68 and 42.00 ± 4.19 seconds, respectively. Also, the mean hemostasis time in the control group (suture) was 84.00 ± 4.05 seconds. The hemostatic times of different concentrations of aluminum chloride were significantly less than that of the control group. There was a statistically significant difference between every two hemostatic time. The pathologic examination showed the highest frequency of low-grade inflammation based on the defined pathological grading. Conclusions: The aluminum chloride method needs less time to control external hemorrhage compared to the control method (controlling external hemorrhage by simple suturing). Aluminum chloride is an effective agent in controlling external hemorrhage in an animal model.
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Affiliation(s)
- Saeed Nouri
- Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
| | - Mohammad Reza Sharif
- Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran
- Corresponding Author: Mohammad Reza Sharif, Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran. Tel: +98-9123788713, Fax: +98-3615558900, E-mail:
| | - Yunes Panahi
- Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
| | - Mostafa Ghanei
- Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
| | - Bardia Jamali
- Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
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Abstract
Background: Controlling parenchymal hemorrhage, especially in liver parenchyma, despite all the progress in surgical science, is still one of the challenges surgeons face. Therefore, search for an effective method to control hepatic bleeding is an important research priority. Objectives: This study attempted to determine the haemostatic effect of ferric sulfate and compare it with the standard method (suturing technique). Materials and Methods: In this animal model study, 60 male Wistar rats were used. An incision (2 cm in length and 1/2 cm in depth) was made on each rat’s liver and the hemostasis time was measured using ferric sulfate with different concentrations (5%, 10%, 15%, 25%, and 50%) and then using simple suturing. The liver tissue was assessed for pathological changes. Results: In all the groups, complete hemostasis occurred. Hemostasis times of different concentrations of ferric sulfate were significantly less than those of the control group (P < 0.001). Conclusions: Ferric sulfate was effective in controlling hepatic bleeding in rats.
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Affiliation(s)
- Saeed Nouri
- Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
| | - Mohammad Reza Sharif
- Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran
- Corresponding author: Mohammad Reza Sharif, Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran. Tel: +98-9123788713, Fax: +98-3615558900, E-mail:
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Nouri S, Sharif MR, Hosseinpour M, Farokhi S, Sharif MH. A Comparison Between Foley and Nelatone Urinary Catheters in Causing Urinary Tract Infection in Animal Models. Nurs Midwifery Stud 2015. [DOI: 10.17795/nmsjournal24363] [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] Open
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Nouri S, Sharif MR, Hosseinpour M, Farokhi S, Sharif MH. A comparison between foley and nelatone urinary catheters in causing urinary tract infection in animal models. Nurs Midwifery Stud 2015; 4:e24363. [PMID: 25830158 PMCID: PMC4377530] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 01/01/2015] [Accepted: 01/13/2015] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Urinary catheterization is one of the main measures used to treat and care for hospitalized patients. Several complications have been attributed to the presence of latex with routine Foley catheters. Therefore, some studies have recommended that Nelatone catheters be substituted for the ordinary Foley catheters to prevent these complications. OBJECTIVES This study aimed to compare the rates of urinary tract infection (UTI) in rabbits catheterized either with Foley or with Nelatone catheters. MATERIALS AND METHODS A randomized controlled trial was conducted on 60 rabbits that were randomly assigned to three groups of twenty. The first group was catheterized using Nelatone catheter; the second group was catheterized using Foley catheter and the third group was studied without performing any catheterization. After seven days, urine samples were collected using suprapubic aspiration and were sent to the laboratory for culture. Descriptive statistics were calculated. Moreover, chi-square and Fisher's exact tests were used for data analysis. RESULTS At the end of the study, four cases in the Nelatone group and 12 cases in the Foley group presented with UTI (P = 0.01). No positive urine cultures were found in the control group. CONCLUSIONS The Nelatone catheters, compared with the Foley ones, had a lower risk of UTI in the long term use. Verifying this claim by further studies can have an important role in reducing UTIs in patients using urinary catheters.
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Affiliation(s)
- Saeed Nouri
- Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
| | - Mohammad Reza Sharif
- Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran,Corresponding author: Mohammad Reza Sharif, Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran. Tel: +98-9123788713, Fax: +98-3155548900, E-mail:
| | - Mehrdad Hosseinpour
- Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran
| | - Shima Farokhi
- Department of Community Health Nursing, Hamadan University of Medical Sciences, Hamadan, IR Iran
| | - Mohammad Hossein Sharif
- Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
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Nouri S, Sharif MR, Tabatabaei F, Farokhi S. Investigating the effect of zinc chloride to control external bleeding in rats. Nurs Midwifery Stud 2015; 3:e22063. [PMID: 25699284 PMCID: PMC4332996 DOI: 10.17795/nmsjournal22063] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 08/12/2014] [Accepted: 08/13/2014] [Indexed: 12/03/2022] Open
Abstract
Background: Despite all progresses in surgical science, bleeding caused by traffic accidents is still a challenge for surgeons to save patients’ lives. Therefore, introducing an effective method to control external bleeding is an important research priority. Objectives: This study aimed to compare haemostatic effect of zinc chloride and simple suturing to control external bleeding. Materials and Methods: In this animal model study, 60 male Wistar rats were used. An incision (two cm in length and half a cm in depth) was made on shaved back of rats. The hemostasis time was measured once using zinc chloride with different concentrations (5%, 10%, 15%, 25%, and 50%) and then using simple suturing. Skin tissue was assessed for pathological changes. Due to abnormal distribution of variables in Kolmogorov-Smirnov test, the data was analyzed using Kruskal-Wallis test Mann-Whitney U tests. Results: In all the groups, complete hemostasis occurred. Hemostasis times of different concentrations of zinc chloride were significantly less than that of the control group (P < 0.001). Conclusions: Zinc chloride was effective to control external bleeding in rats.
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Affiliation(s)
- Saeed Nouri
- Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
| | | | - Fatemeh Tabatabaei
- Isfahan Endocrine and Metabolism Research Center, Isfahan University of Medical Sciences, Isfahan, IR Iran
| | - Shima Farokhi
- Department of Community Health Nursing, Hamadan University of Medical Sciences, Hamadan, IR Iran
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Abstract
Background: Controlling superficial bleeding, despite all the progress in surgical science, is still a challenge in some settings. Objectives: This study assesses the hemostatic effects of ferric chloride and compares it with the standard method (suturing technique) to control superficial bleeding. Materials and Methods: In this animal model study, 60 male Wistar rats were used. An incision, 2 cm long and 0.5 cm deep was made on rat skin and the hemostasis time was recorded using ferric chloride at different concentrations (5%, 10%, 15%, 25%, and 50%) and then using a control (i.e. control of bleeding by suturing). The skin tissue was examined for pathological changes. Finally, the obtained data were entered into SPSS (ver. 16) and analyzed using Kruskal-Wallis test, Mann-Whitney, Kolmogorov-Smirnov, and Wilcoxon signed ranks test. Results: The hemostasis time for the ferric chloride concentration group was significantly less than for the control group (P < 0.001). Conclusions: Ferric chloride may be an effective hemostatic agent to control superficial bleeding in rats.
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Affiliation(s)
- Saeed Nouri
- Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
| | - Mohammad Reza Sharif
- Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran
- Corresponding author: Mohammad Reza Sharif, Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran. Tel: +98-9123788713, Fax: +98-3615558900, E-mail:
| | - Sare Sahba
- Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran
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Abstract
BACKGROUND Poisoning accounts for about 7% of all accidents in children under 5 years and is implicated in over 5% of all childhood deaths in developing countries. OBJECTIVES Due to the potential risks of methadone poisoning in children and increased cases of methadone poisoning among Iranian children, this study was conducted to investigate the clinical signs and symptoms and laboratory findings of methadone toxicity in children. PATIENTS AND METHODS The present retrospective, descriptive, cross-sectional study describes the clinical symptoms and signs and laboratory findings of methadone poisoning in children under 12 years old in Shahid Beheshti Hospital, Kashan, during the years 2009 to 2013. RESULTS Of 58 patients, 33 (56.9%) were male and 25 (43.1%) female (P = 0.294). The mean age of patients was 5.2 ± 1.0 years. All the cases of poisoning happened with methadone syrup, due to unsafe keeping of methadone in mineral water bottles and containers of other drugs. Signs and symptoms included drowsiness (91.4 %), miosis (75.9%), vomiting (69.0%), ineffective breathing (any kind of breathing problem except apnea) (62.1%), apnea (53.4%), cyanosis (43.1%), seizure (8.6%), ataxia (6.9%) and delirium (3.4%). CONCLUSIONS Keeping methadone in appropriate containers and warning methadone consumers about the dangerous side effects of its consumption and the symptoms of methadone poisoning in children may minimize the occurrence of this form of poisoning and its complications in children.
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Affiliation(s)
| | - Saeed Nouri
- Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
- Corresponding author: Saeed Nouri, Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran. Tel: +98-9131365741, E-mail:
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Nouri S, Sharif MR. Efficacy and safety of ferric chloride in controlling hepatic bleeding; an animal model study. Hepat Mon 2014; 14:e18652. [PMID: 24976842 PMCID: PMC4071356 DOI: 10.5812/hepatmon.18652] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Revised: 04/06/2014] [Accepted: 05/15/2014] [Indexed: 12/11/2022]
Abstract
BACKGROUND Controlling parenchymal hemorrhage especially in liver parenchyma, despite all the progress in surgical science, is still one of the challenges surgeons face saving patients' lives and there is a research challenge among researchers in this field to introduce a more effective method. OBJECTIVES This study attempts to determine the haemostatic effect of ferric chloride and compare it with that of the standard method (suturing technique) in controlling bleeding from liver parenchymal tissue. MATERIALS AND METHODS In this animal model study 60 male Wistar rats were used. An incision, two centimeters (cm) long and half a cm deep, was made on each rat's liver and the hemostasis time was measured once using ferric chloride with different concentrations (5%, 10%, 15%, 25% and 50%) and then using the control method (i.e. controlling bleeding by suturing). The liver tissue was examined for pathological changes. RESULTS The hemostasis time of ferric chloride concentration groups was significantly less than that of the control group (P value < 0.001). The pathologic examination showed the highest frequency of low grade inflammation based on the defined pathological grading. CONCLUSIONS Ferric chloride is an effective haemostatic agent in controlling liver parenchymal tissue hemorrhage in an animal model.
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Affiliation(s)
- Saeed Nouri
- Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, IR Iran
| | - Mohammad Reza Sharif
- Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran
- Corresponding Author: Mohammad Reza Sharif, Trauma Research Center, Kashan University of Medical Sciences, Kashan, IR Iran. Tel: +98-9123788713, Fax: +98-3615558900, E-mail:
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Saghrouni F, Ben Abdeljelil J, Nouri S, Gheith S, Fathallah A, Sboui H, Ben Said M. [Double fungemia. Report of four Tunisian cases]. J Mycol Med 2013; 22:192-6. [PMID: 23518024 DOI: 10.1016/j.mycmed.2012.02.001] [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] [Received: 10/04/2011] [Revised: 02/01/2012] [Accepted: 02/10/2012] [Indexed: 11/28/2022]
Abstract
UNLABELLED Fungemia is classically caused by a single species and the detection of more than one species in blood samples is uncommon. We report four cases of mixed fungemia (MF) diagnosed in the parasitology-mycology laboratory of Farhat-Hached hospital in Sousse, Tunisia. The MF episodes occurred in two neonates and two adults suffering from acute myeloid leukemia. Two fungal species were detected concomitantly within the same blood culture in all cases. Species combination was detected by the subculture of the blood culture on Candida ID(®) chromogenic medium in three cases and on Sabouraud agar in one case. Predisposing factors were: indwelling catheters (4/4), broad-spectrum antibiotics (3/4), neutropenia (2/4), exclusive parenteral nutrition (2/4) and Candida colonization (1/4). Patients presented febrile sepsis with no response to broad-spectrum antibiotic therapy in all cases. Outcome under antifungal treatment was favorable in two cases and the two other patients died. CONCLUSION MF appears similar to the more common monomicrobial fungemia. The use of chromogenic media in routine can improve the detection of MF episodes allowing appropriate antifungal therapy.
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Affiliation(s)
- F Saghrouni
- Laboratoire de parasitologie-mycologie, hôpital Farhat-Hached, Sousse, Tunisia.
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Ouni S, Nouri S, Rohlicek J, Ben Hassen R. Structural and electrical properties of the sol–gel prepared Sr1−xErxSnO3−δ compounds. J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2012.03.049] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [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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Ben Abdeljelil J, Saghrouni F, Nouri S, Geith S, Khammari I, Fathallah A, Sboui H, Ben Saïd M. Neonatal invasive candidiasis in Tunisian hospital: incidence, risk factors, distribution of species and antifungal susceptibility. Mycoses 2012; 55:493-500. [PMID: 22448706 DOI: 10.1111/j.1439-0507.2012.02189.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The aim of our study was to assess epidemiological features of neonatal invasive candidiasis in Farhat Hached hospital of Sousse, Tunisia, including incidence, risk factors, mortality, species distribution and antifungal susceptibility. Laboratory data from 1995 to 2010 and medical records of 127 invasive candidiasis cases were reviewed. We tested the susceptibility of 100 Candida sp isolates by using ATB fungus(®) 3 and to fluconazole by using E-test(®) strips. A total of 252 cases of neonatal invasive candidiasis occurred over the study period. The incidence increased 1.8-fold from 1995 to 2006 and decreased fourfold from 2007 to 2010. Candida albicans was the predominant species up to 2006 and a shift in the species spectrum was observed with increase of the non-albicans species mainly C. parapsilosis. The agreement between the ATB Fungus(®) and the E-test(®) for determining fluconazole susceptibility was high. All tested isolates were susceptible to fluconazole, flucytosine, amphotéricine B and voriconazole and the itraconazole resistance rate was 5%. The mortality rate was 63%. The invasive candidiasis incidence increased from 1995 to 2006 and decreased from 2007 to 2010. The spectrum of Candida species and the lack of fluconazole-resistant strains argue for the usefulness of fluconazole as an empiric treatment.
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Affiliation(s)
- J Ben Abdeljelil
- Laboratoire de Parasitologie-Mycologie, Hôpital Farhat Hached, Sousse, Tunisia.
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Ahmadi F, Jamali N, Jahangard-Yekta S, Jafari B, Nouri S, Najafi F, Rahimi-Nasrabadi M. The experimental and theoretical QM/MM study of interaction of chloridazon herbicide with ds-DNA. Spectrochim Acta A Mol Biomol Spectrosc 2011; 79:1004-12. [PMID: 21600841 DOI: 10.1016/j.saa.2011.04.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2010] [Revised: 03/20/2011] [Accepted: 04/10/2011] [Indexed: 05/06/2023]
Abstract
We report a multispectroscopic, voltammetric and theoretical hybrid of QM/MM study of the interaction between double-stranded DNA containing both adenine-thymine and guanine-cytosine alternating sequences and chloridazon (CHL) herbicide. The electrochemical behavior of CHL was studied by cyclic voltammetry on HMDE, and the interaction of ds-DNA with CHL was investigated by both cathodic differential pulse voltammetry (CDPV) at a hanging mercury drop electrode (HMDE) and anodic differential pulse voltammetry (ADPV) at a glassy carbon electrode (GCE). The constant bonding of CHL-DNA complex that was obtained by UV/vis, CDPV and ADPV was 2.1×10(4), 5.1×10(4) and 2.6×10(4), respectively. The competition fluorescence studies revealed that the CHL quenches the fluorescence of DNA-ethidium bromide complex significantly and the apparent Stern-Volmer quenching constant has been estimated to be 1.71×10(4). Thermal denaturation study of DNA with CHL revealed the ΔTm of 8.0±0.2°C. Thermodynamic parameters, i.e., enthalpy (ΔH), entropy (ΔS°), and Gibbs free energy (ΔG) were 98.45 kJ mol(-1), 406.3 J mol(-1) and -22.627 kJ mol(-1), respectively. The ONIOM, based on the hybridization of QM/MM (DFT, 6.31++G(d,p)/UFF) methodology, was also performed using Gaussian 2003 package. The results revealed that the interaction is base sequence dependent, and the CHL has more interaction with ds-DNA via the GC base sequence. The results revealed that CHL may have an interaction with ds-DNA via the intercalation mode.
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Affiliation(s)
- F Ahmadi
- Department of Medicinal Chemistry, Faculty of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, Islamic Republic of Iran.
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Cramer SC, Nouri S. The influence of non-motor regions on behavioral gains from motor cortex stimulation after stroke. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70754-2] [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: 11/30/2022] Open
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22
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Fekih M, Ben Zina N, Jnifen A, Nouri S, Ben Regaya L, Memmi A, Bouguizene S, Chaieb A, Bibi M, Sboui H, Khairi H. [Comparing two Prepidil gel regimens for cervical ripening before induction of labor at term: a randomized trial]. J Gynecol Obstet Biol Reprod (Paris) 2009; 38:335-340. [PMID: 19467806 DOI: 10.1016/j.jgyn.2009.03.015] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2009] [Revised: 03/08/2009] [Accepted: 03/19/2009] [Indexed: 05/27/2023]
Abstract
OBJECTIVES To compare efficacy and safety of two regimens of intracervical dinoprostone (Prepidil) in cervical ripening before labor induction at term. PATIENTS AND METHODS This was a prospective randomized clinical study including 148 patients with single pregnancy, viable fetus at gestational age greater than 36 weeks gestation and a Bishop score less than five, who required induction of labor. Patients were randomised to receive either repeated doses of dinoprostone gel 0.5mg (Prepidil) every 6 hours (group I) or every 12 hours (group II) for maximum three times before inducing labor with Oxytocin. The main outcome was the rate of caesarean sections. RESULTS The two groups were similar in patient characteristics, indication for labor induction and preinduction Bishop scores. The caesarean rate was lower in group I (20.3%) than in group II (23%); though the difference did not reach statistical difference: p=0.69. Delivery rate in the first 24 hours was significantly higher in group I (62.2%) than in group II (40.5%); p=0.009. Prepidil secondary effects were experienced in 8.1% of patients in group I versus 1.4% in group II; p=0.11. Median umbilical artery pH at birth was 7.232+/-0.47 in group I and 7.294+/-0.58 in group II; p=0.30. Maternofetal infections rate was lower in group I (1.4%) than in group II (2.7%) without significant difference (p=0.56). CONCLUSIONS Repeated intracervical doses of Prepidil every 6 hours, in cervical ripening before labor induction at term, enables higher delivery rate in the first 24 hours without inducing excess of caesarean sections or maternofetal morbidity when compared to its administration every 12 hours.
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Affiliation(s)
- M Fekih
- Service de gynécologie-obstétrique, CHU Farhat Hached, 4000 Sousse,Tunisie.
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Abstract
In clinical cardiology, deceleration-dependent QT interval shortening is considered to be an extraordinary electrocardiographic phenomenon. We present an early premature born 4-year-old African-American girl with complications related to her premature birth, developmental delay, and several episodes of cardiac arrest. An episode of severe transient bradyarrhythmia was documented on Holter monitoring. The unique feature of the rhythm strips was paradoxical gradual shortening of the QT interval to 216 ms with accompanying transient T-waves abnormalities. The activation of the Ik, ACh due to an unusually high vagal discharge to the heart is proposed as a possible mechanism responsible for both slowing of the heart rate and shortening of the QT interval.
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Affiliation(s)
- I Gussak
- Division of Cardiology, Saint Louis University Health Science Center, MO 63117, USA
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Larchet C, Nouri S, Auclair B, Dammak L, Nikonenko V. Application of chronopotentiometry to determine the thickness of diffusion layer adjacent to an ion-exchange membrane under natural convection. Adv Colloid Interface Sci 2008; 139:45-61. [PMID: 18308286 DOI: 10.1016/j.cis.2008.01.007] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A brief review of the evolution of the diffusion boundary layer (DBL) conception inspired by the works of Nernst, Levich and Amatore is presented. Experimental methods for studying the DBL in electrode and membrane systems are considered. The electrochemical behaviour of a CM2 cation-exchange membrane in NaCl and KCl solutions is studied by chronopotentiometry at constant under-limiting current. Chronopotentiometric curves are described theoretically by applying the Kedem-Katchalsky equations in differential form to a three-layer system including the membrane and two adjoining DBLs. The conductance coefficients entering the equations are found by treating the results of membrane characterisation: the electrical conductivity, transport numbers of ions and water, electrolyte uptake, as functions of the equilibrium electrolyte solution. The two-phase microheterogeneous model is used for this treatment resulting in presentation of the conductance coefficients as functions of (virtual) electrolyte solution concentration in the membrane. The steady-state DBL thickness (delta) is found by fitting experimental potential drop at sufficiently high times. It is found that delta is proportional to (Delta c)(-0.2), where Delta c is the difference between the electrolyte concentration in the solution bulk and at the interface. This result differs from the Levich equation, which gives the power equal to -0.25 for Delta c. This deviation is explained by the fact that the theory of Levich does not take into account microscopic chaotic convection motion recently described by Amatore et al. It is shown that the treatment of experimental chronopotentiometric curves with the model developed allows one to observe the role of streaming potential in the membrane. Different mechanisms of streaming potential and their effect on the shape of chronopotentiograms are discussed. A simple analytical solution of Navier-Stokes equations applied to natural convection near an infinite vertical ion-exchange membrane is found. It is shown that the formation of DBL induced by electric current is quasi-stationary. This fact allows the empirical expression found earlier and linking delta with Delta c under steady-state conditions to be used in transient regimes. The numerical solution of the non-stationary Kedem-Katchalsky equations together with this empirical expression results in quantitative description of the potential difference (pd) and delta as functions of time in chronopotentiometric experiments. The comparison of theoretical and experimental chronopotentiometric curves shows an excellent agreement, especially for the part after switching off the current. The reasons of a small deviation observed just before the curves attain steady state under a constant current applied are discussed.
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Affiliation(s)
- C Larchet
- Laboratoire des Matériaux Echangeurs d'Ions, Université Paris 12, av du Général de Gaulle, 94010, Créteil, France.
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Nouri S, Mahdhaoui N, Beizig S, Zakhama R, Salem N, Ben Dhafer S, Methlouthi J, Seboui H. [Acute renal failure in full term neonates with perinatal asphyxia. Prospective study of 87 cases]. Arch Pediatr 2008; 15:229-35. [PMID: 18329254 DOI: 10.1016/j.arcped.2008.01.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2006] [Revised: 01/03/2008] [Accepted: 01/22/2008] [Indexed: 02/06/2023]
Abstract
BACKGROUND Renal involvement is frequent in neonates with perinatal asphyxia. It is correlated with the severity of neurological damage and seems to worsen the long-term neurological outcome. PURPOSE The aim of this study was to determine the incidence of renal failure after perinatal asphyxia, to precise the relationship between severity of cerebral damage and renal failure and to evaluate the place of renal damage in the short- and middle-term neurological outcome. POPULATION AND METHODS We conducted a prospective study including 87 full-term neonates admitted in the neonatology department of F. Hached university hospital in Sousse (Tunisia) and suffering from hypoxic ischemic encephalopathy from 1st January 2003 to 30 June 2005. Renal function was assessed by measuring plasma urea and creatinine at age 48 h. Renal failure was defined by a level of creatinine above 90 micromol/l. Neurologic examination was performed on day 7. The survivors were followed up by the same senior after discharge. RESULTS During the study period, 87 full-term neonates were admitted for hypoxic ischemic encephalopathy. The degree of neurological impairment was determined according to Sarnat classification: 1st stage 9 neonates (10,3%), 2nd stage 67 (77%) and 3rd stage 11(12,6%). Renal failure involved 15 neonates (17,2%) of whom 10 belonging to the 2nd stage group. Renal function outcome was favorable in all survivors with normalisation of plasma creatinine level between day 5 and day 15. Eight neonates died, of whom 3 with renal failure. Neurologic examination was abnormal in 36 out of 72 (50%) neonates without renal failure and in 9 of the 12 (75%) survivors with renal failure. Among the 12 neonates with renal failure, 7 had abnormal neurologic features at discharge. Neurologic assessment between 6 and 18 months was abnormal in 4/12 (33%) of neonates with renal failure versus 8/72(11%) of neonates without renal failure. CONCLUSION Transient renal failure is commonly observed in perinatal asphyxia. Renal failure is correlated with neurologic severity. Renal function assessment using creatinine plasma level seems to be correlated with neurologic outcome. However, other tools appreciating renal function, namely tubular function, should be determined earlier in order to predict neurologic outcome after hypoxic ischemic encephalopathy.
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Affiliation(s)
- S Nouri
- Service de néonatologie, CHU Farhat Hached, avenue Ibn El Jazzar, 4000 Sousse, Tunisie.
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Nouri S, Mahdhaoui N, Beizig S, Salem N, Methlouthi J, Ben Dhafer S, Seboui H. Thrombose aortique néonatale majeure: à propos d'une observation. Arch Pediatr 2007; 14:1097-100. [PMID: 17572076 DOI: 10.1016/j.arcped.2007.05.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2006] [Accepted: 05/11/2007] [Indexed: 11/15/2022]
Abstract
Aortic thrombosis is a rare and severe condition in neonates which often is revealed by ischemia of lower limbs. We report a case of major aortic thrombosis revealed by renal failure, hematuria and dehydration in a 10-day-old girl. Clinical features consisted in hypertension at upper limbs without ischemic signs of the lower limbs. Diagnosis was made using renal Doppler ultrasound. Thrombosis resolved after thrombolytic treatment and anticoagulation using heparin. The case report is followed by a review of the literature dealing with clinical, etiological and therapeutic aspects of neonatal arterial thrombosis.
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Affiliation(s)
- S Nouri
- Service de néonatologie, CHU Farhat-Hached, avenue Ibn-El-Jazzar, 4000 Sousse, Tunisie.
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Ben Meriem C, Nouri S, Chouchane C, Chouchane S, Said M, Ghédira L, Moussa A, Boubtane M, Guediche MN. [Eosinophilic granuloma revealed by torticollis: a case report]. Arch Pediatr 2005; 13:44-7. [PMID: 16343867 DOI: 10.1016/j.arcped.2005.09.030] [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] [Received: 08/30/2004] [Accepted: 09/27/2005] [Indexed: 10/25/2022]
Abstract
UNLABELLED Langerhans cell histiocytose is a rare condition in childhood. It presents in different ways ranging from a single bony disease to a multisystemic disease involving vital organs. CASE REPORT We report a case of single bone involvement revealed by torticollis in an eight-year-old boy. The diagnosis was evocated on radiological findings and confirmed by histologic aspects. After a period of 2,5 years, this child is in total spontaneous remission. CONCLUSION Torticollis must be explored and watched. Eosinophilic granuloma can be a rare aetiology in children. The outcome is often favorable.
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Affiliation(s)
- C Ben Meriem
- Service de pédiatrie, CHU de Fattouma-Bourguiba, 5000, Monastir, Tunisie
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Chouchane S, Chouchane CH, Ben Meriem CH, Seket B, Hammami S, Nouri S, Monastiri K, Guediche MN. [Prolonged fever in children. Retrospective study of 67 cases]. Arch Pediatr 2005; 11:1319-25. [PMID: 15519829 DOI: 10.1016/j.arcped.2004.07.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 12/16/2003] [Accepted: 07/07/2004] [Indexed: 11/29/2022]
Abstract
BACKGROUND The first problem to face in prolonged fever is its etiologic diagnosis. Its incidence varies between 0,5 to 3% of all paediatric hospital-stay. Precise diagnosis need an extensive questionnary, complete physical examination and an algorithm of complementary exams. PURPOSE To precise the epidemiologic profile and causes of prolonged fever in a children. POPULATION AND METHODS Retrospective review of 67 children between two and 15 years old admitted in the general paediatrics department of the Fattouma Bourguiba university hospital in Monastir (Tunisia), for prolonged fever between 1(st) January 1988 and 31 December 1998. RESULTS The incidence of prolonged fever was 1,02%. The mean age was seven years with female predominance. The mean fever duration was 30 days. Fever was isolated in 23,9% of cases. Fever was associated to rheumatic or respiratory signs in respectively 26,9% and 20,9% of cases. Hospital-stay was of 11 days in 50% of cases. Prominent causes were dominated by infectious diseases (56,7%) with predominance of localized infections, followed by inflammatory diseases (20,9%) with predominance of rheumatic fever and neoplasms (3%). Fever remained of unknown origin was seen in 19,4% of cases. CONCLUSION Prolonged fever is still dominated by infectious and inflammatory diseases and depend on local epidemiological particularities. In fact we noted in this study the relative high-frequency of visceral leishmaniasis, complicated pulmonary hydatic cyst and rheumatic fever. The diagnosis approach should be based on complementary exams of first and second stage because of their high number and cost. Prognosis of fever of unknown origin is often favorable.
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Affiliation(s)
- S Chouchane
- Service de pédiatrie, CHU Fattouma-Bourguiba, avenue 1(er) juin, 5000 Monastir, Tunisie.
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Abstract
Less than a consensus exists as to whether chronic treatment with selegiline in combination with levodopa/carbidopa in patients with Parkinson's disease, is associated with more pronounced orthostatic hypotension than treatment with levodopa/carbidopa alone. To resolve this issue, we compared orthostatic tolerance and autonomic reflexes in 95 patients with Parkinson's disease treated chronically with either selegiline alone (n = 10), levodopa/carbidopa alone (n = 49) or both agents combined (n = 36). Supine heart rate and blood pressure, autonomic cardiovascular reflexes and the frequency and magnitude of orthostatic hypotension were similar in all three treatment groups.
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Affiliation(s)
- K F Bhattacharya
- Department of Neurology, Mount Sinai School of Medicine, New York, NY 10029, USA
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Haghseresht F, Nouri S, Finnerty JJ, Lu GQ. Effects of Surface Chemistry on Aromatic Compound Adsorption from Dilute Aqueous Solutions by Activated Carbon. J Phys Chem B 2002. [DOI: 10.1021/jp025522a] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- F. Haghseresht
- The Nanomaterials Centre and Department of Chemical Engineering, University of Queensland, Brisbane, QLD 4072, Australia, and Chemistry Department, Urumieh University, Urumieh, Iran
| | - S. Nouri
- The Nanomaterials Centre and Department of Chemical Engineering, University of Queensland, Brisbane, QLD 4072, Australia, and Chemistry Department, Urumieh University, Urumieh, Iran
| | - J. J. Finnerty
- The Nanomaterials Centre and Department of Chemical Engineering, University of Queensland, Brisbane, QLD 4072, Australia, and Chemistry Department, Urumieh University, Urumieh, Iran
| | - G. Q. Lu
- The Nanomaterials Centre and Department of Chemical Engineering, University of Queensland, Brisbane, QLD 4072, Australia, and Chemistry Department, Urumieh University, Urumieh, Iran
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Nouri S, Dammak L, Bulvestre G, Auclair B. Comparison of three methods for the determination of the electrical conductivity of ion-exchange polymers. Eur Polym J 2002. [DOI: 10.1016/s0014-3057(02)00057-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [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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Poigny S, Nouri S, Chiaroni A, Guyot M, Samadi M. Total synthesis and determination of the absolute configuration of coscinosulfate. A new selective inhibitor of Cdc25 protein phosphatase. J Org Chem 2001; 66:7263-9. [PMID: 11681936 DOI: 10.1021/jo010154c] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [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: 11/28/2022]
Abstract
The first total synthesis of coscinosulfate 1, a metabolite isolated from a sea sponge, starting from (+)-sclareolide 3 is described. The convergent synthesis strategy relies on the coupling of sulfone 21 with the bromide 26. The sulfone fragment 21 was obtained by successive asymmetric aldol reaction with aldehyde 2 to introduce the stereocenters at C-12 and C-13, followed by one-carbon homologation via Horner-Wadsworth-Emmons olefination. The selective sulfatation at C-12 was accomplished through the quinone intermediate 31 obtained by selective oxidation of hydroquinone 30; this, when followed by reduction, furnished the desired coscinosulfate 1. X-ray analysis of the intermediate aldehyde 18 confirmed the proposed structure.
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Affiliation(s)
- S Poigny
- Laboratoire de Chimie des Substances Naturelles, associé au CNRS, Muséum National d'Histoire Naturelle, 63, rue Buffon, F-75005 Paris, France
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Voullaire L, Ioannou P, Nouri S, Williamson R. Fetal nucleated red blood cells from CVS washings: an aid to development of first trimester non-invasive prenatal diagnosis. Prenat Diagn 2001; 21:827-34. [PMID: 11746123] [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: 02/22/2023]
Abstract
Fetal nucleated red blood cells (n-rbc) occur in the maternal circulation from 7 weeks of pregnancy. The enrichment of these cells from maternal blood will depend upon their stage of differentiation, which changes during development. We characterised the fetal n-rbc from chorionic villus sample (CVS) washings and used them to model first trimester non-invasive prenatal diagnosis. The ratio of epsilon- to gamma-globin-producing cells declined rapidly from 10 to 13 weeks, as did the ratio of nucleated to non-nucleated rbc. By 13 weeks the great majority of cells containing gamma- or epsilon-globin are anucleate. The fetal n-rbc were highly variable in size and density and sedimented over a wide density range with a high proportion (>80%) at a density overlapping with that of maternal rbc. We have devised an enrichment procedure using Orskoff lysis to differentially lyse the maternal cells followed by density centrifugation and separation using magnetic beads. This simple protocol allowed recovery of 70% (69+/-22%) of fetal cells when added at approximately 10 fetal cells/ml maternal blood. When 1 fetal cell/ml millilitre maternal blood was added (total volume 10 ml) the recovery was more variable but remained at approximately 70% (72+/-47%), with at least one fetal cell recovered in all cases.
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Affiliation(s)
- L Voullaire
- Murdoch Childrens Research Institute, Royal Children's Hospital, Parkville, Victoria 3052, Australia.
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Abstract
H(2)-broadening coefficients have been measured for 66 rovibrational lines of NH(3) at room temperature in the (P)P and (R)P branches of the nu(4) band in the range 1470-1600 cm(-1), using a high-resolution Fourier transform spectrometer. The collisional widths are obtained by fitting Voigt profiles to the measured shapes of the lines. The broadening coefficients are found to decrease on the whole as J increases and they increase with K for a given J value. The results are compared with those calculated from a semiclassical model in which the inversion vibration of NH(3) and collision-induced transitions with DeltaK = 0 and DeltaK = +/- 3 are taken into account. The intermolecular potential used includes electrostatic, induction, and dispersion energy contributions. The calculations performed by considering only DeltaK = 0 transitions provide significantly lower broadenings but with a satisfactory J and K dependence. The same trends are obtained for the broadening coefficients in inversion-rotation transitions and in the Q branch of the nu(1) parallel band of NH(3). Copyright 2001 Academic Press.
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Affiliation(s)
- J.-P. Bouanich
- Laboratoire de Photophysique Moléculaire du CNRS, UPR3361, Université de Paris-Sud, Bãtiment 350, Orsay, 91405, France
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Claus D, Schmitz JM, Nouri S, Richter K. Autonomic tests in diabetic neuropathy. Electroencephalogr Clin Neurophysiol Suppl 2000; 50:541-5. [PMID: 10689506] [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] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Affiliation(s)
- D Claus
- Neurologische Klinik, Klinikum Darmstadt, Lehrkrankenhaus, Univ. Frankfurt, Germany
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Claus D, Schmitz JM, Nouri S. Value and limits of cardiovascular autonomic function tests. Electroencephalogr Clin Neurophysiol Suppl 2000; 50:288-92. [PMID: 10689473] [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] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Affiliation(s)
- D Claus
- Neurologische Klinik, Klinikum Darmstadt, Lehrkrankenhaus, Univ. Frankfurt, Germany
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Claus D, Foerster A, Schmitz JM, Bochannek T, Nouri S. High-rate transcranial magnetic stimulation: influence on short-term-memory, heart rate and blood pressure changes. Electroencephalogr Clin Neurophysiol Suppl 2000; 50:408-12. [PMID: 10689487] [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] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Affiliation(s)
- D Claus
- Neurologische Klinik, Klinikum Darmstadt, Lehrkrankenhaus, Univ. Frankfurt, Germany
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Slater HR, Nouri S, Earle E, Lo AW, Hale LG, Choo KH. Neocentromere formation in a stable ring 1p32-p36.1 chromosome. J Med Genet 1999; 36:914-8. [PMID: 10593999 PMCID: PMC1734276] [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: 02/14/2023]
Abstract
Neocentromeres are functional centromeres formed in chromosome regions outside the normal centromere domains and are found in an increasing number of mitotically stable human marker chromosomes in both neoplastic and non-neoplastic cells. We describe here the formation of a neocentromere in a previously undescribed chromosomal region at 1p32-->p36.1 in an oligospermic patient. Cytogenetic GTL banding analysis and the absence of detectable fluorescence in situ hybridisation (FISH) signals using telomeric probes indicate the marker to be a ring chromosome. The chromosome is negative for CBG banding and is devoid of detectable centromeric alpha satellite and its associated centromere protein CENP-B, suggesting activation of a neocentromere within the 1p32-36.1 region. Functional activity of the neocentromere is shown by the retention of the ring chromosome in 97% of the patient's lymphocytes and 100% of his cultured fibroblasts, as well as by the presence of key centromere binding proteins CENP-E, CENP-F, and INCENP. These results indicate that in addition to CENP-A, CENP-C, and CENP-E described in earlier studies, neocentromere activity can further be defined by CENP-F and INCENP binding. Our evidence suggests that neocentromere formation constitutes a viable mechanism for the mitotic stabilisation of acentric ring chromosomes.
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Affiliation(s)
- H R Slater
- The Murdoch Institute, Royal Children's Hospital, Flemington Road, Parkville 3052, Australia
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Ristevski S, Purcell DF, Marshall J, Campagna D, Nouri S, Fenton SP, McPhee DA, Kannourakis G. Novel endogenous type D retroviral particles expressed at high levels in a SCID mouse thymic lymphoma. J Virol 1999; 73:4662-9. [PMID: 10233925 PMCID: PMC112507 DOI: 10.1128/jvi.73.6.4662-4669.1999] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/1998] [Accepted: 02/19/1999] [Indexed: 11/20/2022] Open
Abstract
A xenograft model of the human disease Langerhans cell histiocytosis (LCH) was investigated with severe combined immunodeficiency (SCID) mice. Transplantation of human LCH biopsy material into SCID mice resulted in the generation of mouse tumors resembling lymphomas. A thymoma cell line (ThyE1M6) was generated from one of these mice and found to display significant levels of Mg2+-dependent reverse transcriptase activity. Electron microscopy revealed particles with type D retroviral morphology budding from ThyE1M6 cells at a high frequency, whereas control cultures were negative. Reverse transcription-PCR of virion RNA with degenerate primers for conserved regions of various mouse, human, and primate retroviruses amplified novel sequences related to primate type D retroviruses, murine intracisternal A particles, Jaagsiekte sheep retrovirus, and murine long interspersed nuclear elements but not other retroviral classes. We demonstrate that these sequences represent a novel group of endogenous retroviruses expressed at low levels in mice but expressed at high levels in the ThyE1M6 cell line. Furthermore, we propose that the activation of endogenous retroviral elements may be associated with a high incidence of thymomas in SCID mice.
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Affiliation(s)
- S Ristevski
- L.A.R.C.H. Cancer Research Unit, Royal Children's Hospital, Parkville, Victoria 3052, Australia
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Singh GK, Shumway JB, Amon E, Marino CJ, Nouri S, Winn HN. Role of fetal echocardiography in the management of isolated fetal heart block with ventricular rate <55 bpm. Am J Perinatol 1999; 15:661-8. [PMID: 10333392 DOI: 10.1055/s-2007-999299] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Persistent bradycardia is an uncommon cardiac problem in fetuses but carries a high mortality in those with a ventricular rate <55 bpm. Fetal heart block is one of the most common causes of persistent fetal bradycardia (PFB). An optimal method for assessing and monitoring cardiovascular compensation in the setting of PFB due to heart block has not been fully established. We report the application of two-dimensional and Doppler echocardiography in close monitoring of cardiac function and hemodynamics in a third-trimester fetus with a ventricular rate <55 bpm due to heart block, which assisted in successful management of the pregnancy to term. Hemodynamic and cardiac adaptive changes in compromised fetuses, particularly due to heart block, are discussed.
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Affiliation(s)
- G K Singh
- Division of Pediatric Cardiology and Maternal-Fetal Medicine, Saint Louis University School of Medicine, Missouri 63104, USA
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Jureidini SB, Marino CJ, Waterman B, Syamasundar Rao P, Balfour IC, Chen SC, Nouri S. Transthoracic Doppler echocardiography of normally originating coronary arteries in children. J Am Soc Echocardiogr 1998; 11:409-20. [PMID: 9619611 DOI: 10.1016/s0894-7317(98)70019-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Transthoracic Doppler color flow and spectral velocity patterns of normal coronary arteries in children have not been well studied. We designed this study to evaluate coronary artery flow velocity characteristics in normal and hypertrophied hearts. Sixty-eight children with optimal two-dimensional echocardiographic images of the left coronary artery (LCA) and right coronary artery (RCA) were prospectively studied. The heart was normal in 45 children, and 23 had left and/or right ventricular hypertrophy assessed by echocardiography (mean age 5.8 versus 5.2 years, p = NS). Color flow signals were detected in the LCA in 63(92%) of the 68 children studied, and pulsed Doppler spectral waveforms were recorded in 47 (69%). The latter were recorded in 26 (58%) of 45 normal children and in 21 (91%) of 23 children with left ventricular hypertrophy. Diastolic RCA flow signals were detected mostly in those with right ventricular hypertrophy (10 of 10). Higher levels of LCA maximum diastolic velocity (42 +/- 23 versus 24 +/- 6 cm/sec, p = 0.0004), increased diastolic flow (16 +/- 15 versus 6 +/- 4 ml/min, p = 0.01), and delayed time to peak diastolic velocity expressed as a percentage of diastolic spectral duration (38% +/- 14% versus 20% +/- 8%, p = 0.0001) were observed in children with left ventricular hypertrophy than in those in normal children. A strong correlation was present between Doppler-derived LCA flow and left ventricular mass/m2 (r = 0.7, p = 0.001). In normal hearts, LCA spectral velocity pattern did not change with increasing age, but the time velocity integral became progressively larger, resulting in a strong correlation with weight (p < 0.001, r = 0.78). This study demonstrates (1) LCA flow signals can be detected and quantitated in the majority of children with and those without left ventricular hypertrophy. (2) Left ventricular hypertrophy is associated with increased LCA flow, higher diastolic velocity, and delayed peak diastolic velocity. (3) RCA flow signals are mostly detected when there is right ventricular hypertrophy. Studies on larger groups of patients are needed to further confirm our observations and to enhance understanding of coronary artery flow reserve.
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Affiliation(s)
- S B Jureidini
- Department of Pediatrics, Saint Louis University School of Medicine, Cardinal Glennon Children's Hospital, Missouri 63104, USA
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Abstract
Immediate- and short-term follow-up results of balloon dilatation of aortic recoarctation following surgery have been well documented, but there is sparse data on long-term follow-up. During a 10-year period ending in August 1995, 33 children, aged 2 months to 14 years old, underwent balloon angioplasty of aortic recoarctation. Prior surgery included resection and end-to-end anastomosis (n = 9), subclavian flap (n = 16) or prosthetic (Dacron or Gore-Tex) patch (n = 5) angioplasty, and repair of an interrupted aortic arch (n = 3). Recoarctation developed 1 month to 14 years (mean +/- SD 29 +/- 44 months) after surgery. The indications for angioplasty were peak-to-peak systolic gradients > 20 mm Hg and systemic hypertension and/or congestive heart failure. After balloon angioplasty, the peak-to-peak systolic pressure gradient across the coarctation decreased from 48 +/- 22 to 13 +/- 15 mm Hg (p <0.01), and the size of the coarcted segment increased from 3.3 +/- 1.4 to 6.5 +/- 2.3 mm (p <0.01). Follow-up angiography and/or magnetic resonance imaging were performed in 20 children 17 +/- 12 months after angioplasty. No aneurysms were observed and improvement in the diameter of the coarcted aortic segment (9 +/- 3 mm) persisted. One- to 10-year (median 5) clinical follow-up was available in 32 children. During follow-up, 2 children required surgery to repair a long tubular isthmic narrowing. The residual gradients, determined by arm-leg systolic blood pressure difference, were 5 +/- 8 mm Hg. No patient was symptomatic and only 1 patient (3%) was hypertensive, controlled with antihypertensive medications. We conclude that balloon angioplasty of aortic recoarctation following all types of surgical repair is feasible, safe, and effective with good long-term results. We recommend balloon angioplasty as the procedure of choice in the management of postsurgical recoarctation with hypertension and/or congestive heart failure.
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Affiliation(s)
- G Siblini
- Department of Pediatrics, Saint Louis University School of Medicine/Cardinal Glennon Children's Hospital, Missouri 63104-1095, USA
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Affiliation(s)
- J A Unuigbe
- Departments of Obstetrics and Gynaecology, and Surgery, King Fahad Central Hospital, Gizan, Saudi Arabia
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Dajani AS, Taubert KA, Wilson W, Bolger AF, Bayer A, Ferrieri P, Gewitz MH, Shulman ST, Nouri S, Newburger JW, Hutto C, Pallasch TJ, Gage TW, Levison ME, Peter G, Zuccaro G. Prevention of bacterial endocarditis: recommendations by the American Heart Association. Clin Infect Dis 1997; 25:1448-58. [PMID: 9431393 DOI: 10.1086/516156] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.0] [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: 02/05/2023] Open
Abstract
OBJECTIVE To update recommendations issued by the American Heart Association last published in 1990 for the prevention of bacterial endocarditis in individuals at risk for this disease. PARTICIPANTS An ad hoc writing group appointed by the American Heart Association for their expertise in endocarditis and treatment with liaison members representing the American Dental Association, the Infectious Diseases Society of America, the American Academy of Pediatrics, and the American Society for Gastrointestinal Endoscopy. EVIDENCE The recommendations in this article reflect analyses of relevant literature regarding procedure-related endocarditis, in vitro susceptibility data of pathogens causing endocarditis, results of prophylactic studies in animal models of endocarditis, and retrospective analyses of human endocarditis cases in terms of antibiotic prophylaxis usage patterns and apparent prophylaxis failures. MEDLINE database searches from 1936 through 1996 were done using the root words endocarditis, bacteremia, and antibiotic prophylaxis. Recommendations in this document fall into evidence level III of the US Preventive Services Task Force categories of evidence. CONSENSUS PROCESS The recommendations were formulated by the writing group after specific therapeutic regimens were discussed. The consensus statement was subsequently reviewed by outside experts not affiliated with the writing group and by the Science Advisory and Coordinating Committee of the American Heart Association. These guidelines are meant to aid practitioners but are not intended as the standard of care or as a substitute for clinical judgment. CONCLUSIONS Major changes in the updated recommendations include the following: (1) emphasis that most cases of endocarditis are not attributable to an invasive procedure; (2) cardiac conditions are stratified into high-, moderate-, and negligible-risk categories based on potential outcome if endocarditis develops; (3) procedures that may cause bacteremia and for which prophylaxis is recommended are more clearly specified; (4) an algorithm was developed to more clearly define when prophylaxis is recommended for patients with mitral valve prolapse; (5) for oral or dental procedures the initial amoxicillin dose is reduced to 2 g, a follow-up antibiotic dose is no longer recommended, erythromycin is no longer recommended for penicillin-allergic individuals, but clindamycin and other alternatives are offered; and (6) for gastrointestinal or genitourinary procedures, the prophylactic regimens have been simplified. These changes were instituted to more clearly define when prophylaxis is or is not recommended, improve practitioner and patient compliance, reduce cost and potential gastrointestinal adverse effects, and approach more uniform worldwide recommendations.
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Affiliation(s)
- A S Dajani
- American Heart Association, Dallas, Texas 75231, USA
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Dajani AS, Taubert KA, Wilson W, Bolger AF, Bayer A, Ferrieri P, Gewitz MH, Shulman ST, Nouri S, Newburger JW, Hutto C, Pallasch TJ, Gage TW, Levison ME, Peter G, Zuccaro G. Prevention of bacterial endocarditis: recommendations by the American Heart Association. J Am Dent Assoc 1997; 128:1142-51. [PMID: 9260427 DOI: 10.14219/jada.archive.1997.0375] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To update recommendations issued by the American Heart Association last published in 1990 for the prevention of bacterial endocarditis in individuals at risk for this disease. PARTICIPANTS An ad hoc writing group appointed by the American Heart Association for their expertise in endocarditis and treatment with liaison members representing the American Dental Association, the infectious Diseases Society of America, the American Academy of Pediatrics and the American Society for Gastrointestinal Endoscopy. EVIDENCE The recommendations in this article reflect analyses of relevant literature regarding procedure-related endocarditis, in vitro susceptibility data of pathogens causing endocarditis, results of prophylactic studies in animal models of endocarditis and retrospective analyses of human endocarditis cases in terms of antibiotic prophylaxis usage patterns and apparent prophylaxis failures. MEDLINE database searches from 1936 through 1996 were done using root words endocarditis, bacteremia and antibiotic prophylaxis. Recommendations in this document fall into evidence level III of the U.S. Preventive Services Task Force categories of evidence. CONSENSUS PROCESS The recommendations were formulated by the writing group after specific therapeutic regimens were discussed. The consensus statement was subsequently reviewed by outside experts not affiliated with the writing group and by the Science Advisory and Coordinating Committee of the American Heart Association. These guidelines are meant to aid practitioners but are not intended as the standard of care or as a substitute for clinical judgment. CONCLUSIONS Major changes in the updated recommendations include the following: (1) emphasis that most cases of endocarditis are not attributable to an invasive procedure; (2) cardiac conditions are stratified into high-, moderate- and negligible-risk categories based on potential outcome if endocarditis develops; (3) procedures that may cause bacteremia and for which prophylaxis is recommended are more clearly specified; (4) an algorithm was developed to more clearly define when prophylaxis is recommended for patients with mitral valve prolapse; (5) for oral or dental procedures the initial amoxicillin dose is reduced to 2 g, a follow-up antibiotic dose is no longer recommended, erythromycin is no longer recommended for penicillin-allergic individuals, but clindamycin and other alternatives are offered.
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Dajani AS, Taubert KA, Wilson W, Bolger AF, Bayer A, Ferrieri P, Gewitz MH, Shulman ST, Nouri S, Newburger JW, Hutto C, Pallasch TJ, Gage TW, Levison ME, Peter G, Zuccaro G. Prevention of bacterial endocarditis. Recommendations by the American Heart Association. Circulation 1997; 96:358-66. [PMID: 9236458 DOI: 10.1161/01.cir.96.1.358] [Citation(s) in RCA: 288] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
OBJECTIVE To update recommendations issued by the American Heart Association last published in 1990 for the prevention of bacterial endocarditis in individuals at risk for this disease. PARTICIPANTS An ad hoc writing group appointed by the American Heart Association for their expertise in endocarditis and treatment with liaison members representing the American Dental Association, the Infectious Diseases Society of America, the American Academy of Pediatrics, and the American Society for Gastrointestinal Endoscopy. EVIDENCE The recommendations in this article reflect analyses of relevant literature regarding procedure-related endocarditis, in vitro susceptibility data of pathogens causing endocarditis, results of prophylactic studies in animal models of endocarditis, and retrospective analyses of human endocarditis cases in terms of antibiotic prophylaxis usage patterns and apparent prophylaxis failures. MEDLINE database searches from 1936 through 1996 were done using the root words endocarditis, bacteremia, and antibiotic prophylaxis. Recommendations in this document fall into evidence level III of the US Preventive Services Task Force categories of evidence. CONSENSUS PROCESS The recommendations were formulated by the writing group after specific therapeutic regimens were discussed. The consensus statement was subsequently reviewed by outside experts not affiliated with the writing group and by the Science Advisory and Coordinating Committee of the American Heart Association. These guidelines are meant to aid practitioners but are not intended as the standard of care or as a substitute for clinical judgment. CONCLUSIONS Major changes in the updated recommendations include the following: (1) emphasis that most cases of endocarditis are not attributable to an invasive procedure; (2) cardiac conditions are stratified into high-, moderate-, and negligible-risk categories based on potential outcome if endocarditis develops; (3) procedures that may cause bacteremia and for which prophylaxis is recommended are more clearly specified; (4) an algorithm was developed to more clearly define when prophylaxis is recommended for patients with mitral valve prolapse; (5) for oral or dental procedures the initial amoxicillin dose is reduced to 2 g, a follow-up antibiotic dose is no longer recommended, erythromycin is no longer recommended for penicillin-allergic individuals, but clindamycin and other alternatives are offered; and (6) for gastrointestinal or genitourinary procedures, the prophylactic regimens have been simplified. These changes were instituted to more clearly define when prophylaxis is or is not recommended, improve practitioner and patient compliance, reduce cost and potential gastrointestinal adverse effects, and approach more uniform worldwide recommendations.
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47
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Dajani AS, Taubert KA, Wilson W, Bolger AF, Bayer A, Ferrieri P, Gewitz MH, Shulman ST, Nouri S, Newburger JW, Hutto C, Pallasch TJ, Gage TW, Levison ME, Peter G, Zuccaro G. Prevention of bacterial endocarditis. Recommendations by the American Heart Association. JAMA 1997; 277:1794-801. [PMID: 9178793] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
OBJECTIVE To update recommendations issued by the American Heart Association last published in 1990 for the prevention of bacterial endocarditis in individuals at risk for this disease. PARTICIPANTS An ad hoc writing group appointed by the American Heart Association for their expertise in endocarditis and treatment with liaison members representing the American Dental Association, the Infectious Diseases Society of America, the American Academy of Pediatrics, and the American Society for Gastrointestinal Endoscopy. EVIDENCE The recommendations in this article reflect analyses of relevant literature regarding procedure-related endocarditis, in vitro susceptibility data of pathogens causing endocarditis, results of prophylactic studies in animal models of endocarditis, and retrospective analyses of human endocarditis cases in terms of antibiotic prophylaxis usage patterns and apparent prophylaxis failures. MEDLINE database searches from 1936 through 1996 were done using the root words endocarditis, bacteremia, and antibiotic prophylaxis. Recommendations in this document fall into evidence level III of the US Preventive Services Task Force categories of evidence. CONSENSUS PROCESS The recommendations were formulated by the writing group after specific therapeutic regimens were discussed. The consensus statement was subsequently reviewed by outside experts not affiliated with the writing group and by the Science Advisory and Coordinating Committee of the American Heart Association. These guidelines are meant to aid practitioners but are not intended as the standard of care or as a substitute for clinical judgment. CONCLUSIONS Major changes in the updated recommendations include the following: (1) emphasis that most cases of endocarditis are not attributable to an invasive procedure; (2) cardiac conditions are stratified into high-, moderate-, and negligible-risk categories based on potential outcome if endocarditis develops; (3) procedures that may cause bacteremia and for which prophylaxis is recommended are more clearly specified; (4) an algorithm was developed to more clearly define when prophylaxis is recommended for patients with mitral valve prolapse; (5) for oral or dental procedures the initial amoxicillin dose is reduced to 2 g, a follow-up antibiotic dose is no longer recommended, erythromycin is no longer recommended for penicillin-allergic individuals, but clindamycin and other alternatives are offered; and (6) for gastrointestinal or genitourinary procedures, the prophylactic regimens have been simplified. These changes were instituted to more clearly define when prophylaxis is or is not recommended, improve practitioner and patient compliance, reduce cost and potential gastrointestinal adverse effects, and approach more uniform worldwide recommendations.
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Affiliation(s)
- A S Dajani
- American Heart Association, Dallas, Tex 75231, USA
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Foerster A, Schmitz JM, Nouri S, Claus D. Safety of rapid-rate transcranial magnetic stimulation: heart rate and blood pressure changes. Electroencephalogr Clin Neurophysiol 1997; 104:207-12. [PMID: 9186235 DOI: 10.1016/s0168-5597(97)00016-6] [Citation(s) in RCA: 26] [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] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We examined the influence of rapid-rate transcranial magnetic stimulation on heart rate and blood pressure in 13 healthy volunteers. In a first series three different cortical magnetic stimuli were applied: over C3, C4 and Fz (10/20 system), in a second series additionally over Pz. We also used a stimulus over the brachial plexus and a sham stimulus. Five stimuli of each location were applied with a Cadwell high speed magnetic stimulator using a focal point circular coil. Stimulus train duration was 500 ms, stimulus frequency 20 Hz. Stimulus strength was 70-90% of maximum stimulator output, 20% of maximum stimulator output above subjects' individual motor threshold. The subjects assessed stimulus inconvenience immediately after stimulation. ECG and blood pressure (Finapres) were recorded continuously during the 1 h test. In all subjects there was a clearly marked autonomic response with heart rate acceleration and decrease in blood pressure after all stimuli. There was no difference in responses between cortical stimuli. Blood pressure decrease after sham stimulation was significantly smaller than after cortical stimulation, it was more marked after brachial plexus stimulation. Autonomic reaction correlates well with subjective estimation of stimulus inconvenience. We conclude the observed effect of rapid-rate transcranial magnetic stimulation to be associated to rather an unspecific arousal reaction than to a direct stimulation of autonomic cortex areas. We did not observe any clinically relevant side-effects.
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Affiliation(s)
- A Foerster
- Department of Neurology, Friedrich-Alexander-Universität Erlangen, Germany
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Affiliation(s)
- S Nouri
- Department of Pediatrics, Cardinal Glennon Hospital/St Louis University, Missouri 63104, USA
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50
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McCrindle BW, Jones TK, Morrow WR, Hagler DJ, Lloyd TR, Nouri S, Latson LA. Acute results of balloon angioplasty of native coarctation versus recurrent aortic obstruction are equivalent. Valvuloplasty and Angioplasty of Congenital Anomalies (VACA) Registry Investigators. J Am Coll Cardiol 1996; 28:1810-7. [PMID: 8962571 DOI: 10.1016/s0735-1097(96)00379-8] [Citation(s) in RCA: 114] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVES This study sought to compare the immediate results and risk factors for suboptimal outcomes of percutaneous balloon angioplasty for native versus recurrent aortic obstruction. BACKGROUND Some cardiology centers have been reluctant to adopt balloon angioplasty for treatment of native aortic coarctation, while advocating balloon angioplasty over an operation for treatment of postsurgical or recurrent aortic obstruction. METHODS Acute results were analyzed from 970 procedures (422 native and 548 recurrent lesions) performed between 1982 and 1995 in 907 patients from 25 centers. An acute suboptimal outcome was defined as one or more of the following: residual systolic pressure gradient > or = 20 mm Hg, residual proximal to distal systolic pressure ration > or = 1.33 or a major complication (death, aortic transmural tear, stroke). RESULTS Bal loon angioplasty significantly (p = 0.0001) increased lesion diameter fo r both native (mean [+/= SD] 128 +/= 94%) and recurrent aortic obstruction (97 +/= 87%), with a significantly greater increase in the native group (p = 0.0001). A reduction in systolic pressure gradients was significant in both groups (p = 0.0001), but slightly higher (p = 0.01) for native (-74 +/- 24%) versus recurrent obstruction (-70 +/- 31%). Death associated with angioplasty was reported in 0.7% of patients with native and in 0.7% of patients with recurrent lesions (p = 1.00). An acute suboptimal outcome was noted with angioplasty in 19% of native and in 25% of recurrent lesions (p = 0.04). Significant independent risk factors included higher preangioplasty systolic gradient (odds ratio [OR] 1.39/10-mm Hg increment; 95% confidence interval [CI] 1.28 to 1.50, p = 0.0001), earlier study date (OR 0.92/1-year increment, 95% CI 1.02 to 1.26, p = 0.02) and recurrent obstruction (OR 1.39 vs. native lesions, 95% CI 1.00 to 1.94, p = 0.05). CONCLUSIONS Acute results and complications of balloon angioplasty of native coarctation appear to be equivalent or slightly superior to those of recurrent aortic obstructions.
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Affiliation(s)
- B W McCrindle
- Department of Pediatrics, Hospital for Sick Children, University of Toronto, Ontario, Canada
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