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Swelling ability and behaviour of bentonite-based materials for deep repository engineered barrier systems:Influence of physical,chemical and thermal factors

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 689-702页

作者： Mohammed Alzamel mamadou Fall Sada Haruna Department of Civil Engineering University of OttawaOttawaOntarioK1N 6N5Canada

Compacted bentonite-sand(b/S)mixtures have been used as a barrier material in engineered barrier systems(EbSs)of deep geological repositories(DGR)to store nuclear *** study investigates the individual and combined effects of different chemical compositions of deep groundwaters(chemical factor)at potential repository sites in Canada(the Trenton and Guelph regions in Ontario),heat generated in DGRs(thermal factor),dry densities and mass ratios of bentonite and sand mixtures(physical factors)on the swelling behavior and ability of bentonite-based *** this study,swelling tests are conducted on b/S mixtures with different b/S mix ratios(20/80 to 70/30),compacted at different dry densities(ρd=1.6-2 g/cm^(3)),saturated with different types of water(distilled water and simulated deep groundwater of Trenton and Guelph)and exposed to different temperatures(20℃-80℃).Moreover,scanning electron microscopy(SEM)analyses,mercury intrusion porosimetry(MIP)tests and X-ray diffractometry(XRD)analyses are carried out to evaluate the morphological,microstructural and mineralogical characteristics of the b/S *** test results indicate that the swelling potential of the b/S mixtures is significantly affected by these physical and chemical factors as well as the combined effects of the chemical and thermal factors.A significant decrease in the swelling capacity is observed when the b/S materials are exposed to the aforementioned groundwaters.A large decrease in the swelling capacity is observed for higher bentonite content in the ***,higher temperatures intensify the chemically-induced reduction of the swelling capacity of the b/S barrier *** decrease in the swelling capacity is caused by the chemical and/or microstructural changes of the *** results from this research will help engineers to design and build EbSs for DGRs with similar groundwater and thermal conditions.

关键词： Deep geological repository Engineered barrier bentonite-sand materials Nuclear waste Swelling capacity Swelling strain

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A Very Severe Obstructive Sleep Apnea Syndrome: In a Cause of Resistant Hypertension with One Sample Case

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World Journal of Cardiovascular Diseases 2021年第3期11卷 223-229页

作者： b.ldé Elhadj Yaya bah mamadou bassirou barry Ibrahima Sory béavogui Mariama Sylla Ibrahima Sory b.ldé mamadou Aliou Koné Alpha Diallo mamadou Camara Abdoulaye b.ldé Siradiou b.ldé mamadou dadhi Dièye Ousmane Condé Mamady Cardiology Department of the Ignace Deen Hospital Conakry Guinea Cardiology Department of Donka Hospital Conakry Guinea Sakina Clinic in Dakar Dakar Senegal

When blood pressure values remain above the target in a hypertensive patient treated concomitantly with three anti-hypertensive drugs including a diuretic, maximum well-tolerated doses, this is a resistant arterial hypertension. In this case, it is advisable to look for a secondary cause such as a drug intake that influencing the blood pressure or the presence of obstructive sleeping syndrome (OSAS). We report a clinical case of a patient with a high cardiovascular risk at the age of 50, hypertensive and diabetic, with dyslipidemia and obesity. He was on anti-hypertensive triple therapy at an optimal dose. Her diabetes was balanced with 6.4% glycated hemoglobin. Dyslipidemia has being treated. Despite healthy diet including a low sodium diet and weight loss, blood pres- sure target was not reached. With self-measurement, the mean arterial pressure was 180/110 mmHg and on ABPM it was 167/113 mmHg. The ventilatory polygraphy finds a severe OSA with an IAH = 56.6. Treatment with PCP (Con- tinuous positive pressure) allowed this patient to control blood pressure. The search for OSA should be systematic in face of resistant hypertension, in par- ticular in overweight or obese patients.

关键词： Obstructive Sleep Apnea Syndrome (OSAS) Resistant Hypertension Continuous Positive Airway Pressure (CPAP)

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Asymptomatic Cardiac Manifestations in Rheumatoid Arthritis in Conakry (Guinea)

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Open Journal of Rheumatology and Autoimmune Diseases 2022年第2期12卷 57-64页

作者： Aly badra Kamissoko Ibrahima Sory barry Marina Sanda Cletus Dieuval Houngbegnon mamadou Lamine Diallo Abdoulaye barry mamadou dadhi b.ldé Owonayo Oniankitan Department of Rheumatology Ignace Deen National Hospital Conakry Guinea Department of Cardiology Ignace Deen National Hospital Conakry Guinea Department of Rheumatology Sylvanus Olympio University Hospital Lome Togo

Introduction: Rheumatoid arthritis (RA) is the most common chronic inflammatory rheumatic disease. It is a systemic disease with extra-articular manifestations that can be life-threatening. In sub-Saharan Africa, there is little published information on cardiovascular manifestations in RA. Objective: The objective is to determine the asymptomatic cardiac manifestations during rheumatoid arthritis in Conakry. Patients and Methods: This was a cross-sectional study lasting 6 months from January 1, 2020 to June 30, 2020 in the rheumatology and cardiology departments of the Ignace Deen National Hospital. Patients with RA diagnosed according to the 2010 ACR/EULAR criteria, asymptomatic at the cardiovascular level, which had an ECG and echocardiography, were included in the study. Left ventricular diastolic dysfunction was considered in any patient with an E/A ratio 1, an E/E’ ratio > 10, and an LVEF = 50%, assessed by the Simpson biplane method and classified according to Redfield. Epidemiological, clinical and paraclinical data were analyzed using SPSS statistics 21.0 software. Results: Seventeen cases of rheumatoid arthritis (5.9%) were collected. There was a predominance of women with 14 cases (82.4%). The mean age of patients was 48.2 ± 11.9 years. The average duration of RA was 7.2 ± 4.2 years. Cardiovascular risk factors were dominated by overweight and obesity (58.8%) and sedentary lifestyle (35.3%). RA was predominantly high activity (DAS 28 ≥ 5.1) in 82.4% of patients. Anti-CCP antibodies were positive in 76.9% of cases. Fourteen patients (82.4%) had abnormal cardiac results. The electrocardiogram showed left atrial hypertrophy in 29.4% of cases, left ventricular hypertrophy (11.8%) and ventricular extrasystole (11.8%). The cardiac Doppler scan showed diastolic dysfunction of the left ventricle (47.1%) and moderate pericardial effusion in 11.8% of cases. Conclusion: The study found asymptomatic cardiac manifestations of rheumatoid arthritis. They were dominated b

关键词： Rheumatoid Arthritis Asymptomatic Manifestations Electrocardiography Sub-Saharan Africa Guinea

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Myocardial Perfusion Abnormalities in Patients with Hereditary Hypertrophic Cardiomyopathy: A Study of Three Cases and Review of the Literature

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World Journal of Cardiovascular Diseases 2023年第6期13卷 289-296页

作者： Ngardjibem Djita Ibrahima Sory Sylla mamadou bassirou bah Felix Collard Sana Samoura mamadou Aliou b.ldé Souleymane Diakité Ibrahima Sory barry Alpha Koné Elhadj Yaya b.ldé Mariame béavogui mamadou dadhi b.ldé Philippe Chevalier Department of Cardiology Alen&ccedilon Hospital Alen&ccedilon France Department of Cardiology CHU Ignace Deen Conakry Guinea Department of Cardiology Sino-Guinean Friendship Hospital Conakry Guinea Department of Cardiology CHU Lyon Lyon France

Introduction: Hypertrophic cardiomyopathy (HCM) belongs to the very heterogeneous group of cardiomyopathies. This study aimed to study myocardial perfusion abnormalities on scintigraphy and assess the risk of sudden death from ventricular arrhythmia in hereditary sarcomeric HCM. Patients and Methods: This is a retrospective and prospective descriptive study over 18 months (January 01, 2021, to July 31, 2022) on the records of patients over 18 with the diagnosis of hypertrophic sarcomeric cardiomyopathy with or without ventricular rhythm disorders and who have undergone myocardial scintigraphy. Results: Three patients were included. The average age of our patients was 66 years old. Dyspnea is the primary symptomatology found in our patients. One patient presented with syncope and unsustained ventricular tachycardia. His risk score for sudden death from ESC at five years is estimated at 6.45%, and the patient received an ICD in primary prevention. The average sudden death risk score of our patients was 3.78%. The mean LV wall thickness was 20 mm. The mean maximum left intraventricular gradient was 39 mmHg. Myocardial fibrosis was present in all our patients. Myocardial scintigraphy was normal in all cases. Conclusion: Hypertrophic cardiomyopathy is a very heterogeneous group of cardiomyopathies. The rhythmic risk is multifactorial and constitutes a significant prognostic factor.

关键词： Hypertrophic Cardiomyopathy Myocardial Scintigraphy Sudden Death Ven-tricular Arrhythmia

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Dyspnea in a 26-Year-Old Woman with Fatal Left Atrial Myxoma

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World Journal of Cardiovascular Diseases 2023年第6期13卷 309-312页

作者： Ibrahima Sory Sylla mamadou Aliou b.ldé mamadou bassirou bah Sana Samoura Souleymane Diakité Alpha Koné Ibrahima Sory barry Mariame béavogui Djibril Sylla Elhadj Yaya b.ldé Mamadi Condé mamadou dadhi b.ldé Department of Cardiology Ignace Deen National Hospital Conakry Guinea Faculty of Health Sciences and Techniques Gamal Abdel Nasser University of Conakry Conakry Guinea Department of Cardiology Sino-Guinean Hospital Conakry Guinea Department of Internal Medicine CHU Conakry Guinea

Cardiac myxoma is one of the primary intracardiac tumours. We report the case of a left atrial myxoma in a 26-year-old female patient admitted for investigation of dyspnoea. Echocardiography led to the diagnosis of a giant hypermobile myxoma prolapsing into the left ventricle. The patient died before being evacuated for surgical treatment.

关键词： Myxoma Left Atrium Echocardiography

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Evaluation of the Knowledge, Attitudes and Practices of the Hospital Staff in the Management of High blood Pressure in Conakry

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World Journal of Cardiovascular Diseases 2019年第5期9卷 354-359页

作者： Ibrahima Sory 2 Sylla Djibril Sylla Elhadj Yaya b.ldé Aissatou barry Mabintou Condé mamadou bachir bah mamadou Aliou b.ldé Sana Samoura Ibrahima Sory barry Mariame béaovogui mamadou dadhi b.ldé Mamadi Condé Cardiology Department Hospital Conakry Conakry Guinea Medico-Surgical Emergencies Department Hospital Donka Conakry Guinea

Introduction: High blood pressure is a real public health problem affecting more than one in three adults. The objective of this study was to evaluate the level of knowledge, attitudes and practices of health care personnel in the management of hypertension in Conakry. Methods: Descriptive transversal study of 6 months, from April 20, 2018 to September 20, 2018, which took place in the internal medicine departments of the two university hospital centers (CHU) of Conakry (Donka and Ignace Deen). The study population consisted of general practitioners and specialists, practicing in both departments for at least two years and who agreed to submit to our questionnaire. Results: At the end of the study, we included 140 doctors, 61% at Donka University Hospital and 39% at Ignace Deen University Hospital. The predominance was male with 113 men for 27 women with a sex ratio H/F = 4.18. General practitioners were the most represented with 95% against 5% specialists. Sixty-four percent of physicians gave an exact definition of hypertension, 56% of physicians confirmed the diagnosis of hypertension after 2 to 3 consultations. 19% offered monotherapy as first-line treatment, only 72% said that the duration of Antihypertensive treatment was for life. Conclusion: Theseresults demonstrate that it is essential to reflect on our daily practices for a good improvement in the quality of care for patients.

关键词： High blood Pressure Knowledge Attitudes and Practices Conakry

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Ruptured Sub-Annular Mitral Aneurysm in the Pericardium: Report of a Case

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World Journal of Cardiovascular Diseases 2021年第9期11卷 458-463页

作者： Elhadj Yaya b.ldé mamadou bassirou bah Amadou Djouldé Doumbouya Aissatou Tiguidanké b.ldé mamadou Cellou Guissé Ibrahima Sory barry Alpha Koné Mariam béavogui Souleymane Diakité Ibrahima Sory 2 Sylla mamadou Aliou b.ldé Abdoulaye Camara mamadou Diallo Thierno Siradjo b.ldé mamadou dadhi b.ldé Mamady Condé Cardiology Department of the Ignace Deen Hospital Conakry Guinea Cardiology Department of Donka Hospital Conakry Guinea

The sub-mitral annular aneurysm is a rare cardiac pathology. The etiologies are diverse, ranging from the congenital form to the idiopathic form, including the acquired form. The clinical case we report is that of a 27-year-old young man, with no particular history, admitted with a picture of global heart failure. A cardiac ultrasound diagnosed a ruptured mitral sub-annular aneurysm in the pericardium. The difficulty lies in the surgical management of this condition, due to the lack of an adequate cardiac surgery service in most of the countries in Africa south of the Sahara.

关键词： Sub-Annular Aneurysm Mitral Valve Intrapericardial Rupture

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Takayasu Disease Revealed by Arterial Hypertension in a 47-Year-Old Man

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World Journal of Cardiovascular Diseases 2023年第7期13卷 341-348页

作者： bah mamadou bassirou b.ldé Thierno Hamidou Wann Thierno Amadou b.ldé Elhadj Yaya b.ldé Aissatou Tiguidanké Koné Alpha Doumbouya Amadou Diouldé Diallo Hafsatou barry Ibrahima Sory Samoura Sana Diakité Souleymane béavogui Mariam b.ldé mamadou dadhi Cardiology Department Ignace Deen Hospital Conakry Guinea Department of Imaging Ignace Deen Hospital Conakry Guinea Department of Internal Medicine Donka Hospital Conakry Guinea Cardiology Department Donka Hospital Conakry Guinea

Takayasu disease is a chronic vasculitis of the large vessels. It is rare in sub- Saharan Africa and probably under-diagnosed. Arterial hypertension (AH) is a frequent finding. We report the case of a 46-year-old man with Takayasu disease revealed by hypertension. The American College of Rheumatology (ACR) criteria were used for diagnosis, with 4 out of 6 criteria. Echodoppler and angioscanner showed signs of left subclavian stenosis and circumferential, regular arterial thickening. He had a biological inflammatory syndrome. He was treated with prednisone and amlodipine. After 6 months of follow-up, he was diagnosed with tuberculosis and put on anti-tuberculosis treatment.

关键词： Takayasu Disease Hypertension Man

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Cardio-Renal Syndrome: Epidemiological, Clinical, Paraclinical, Etiological Aspects and Prognostic Factors in the Cardiology Department of the CHU Ignace Deen in Conakry

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World Journal of Cardiovascular Diseases 2023年第4期13卷 189-197页

作者： barry Ibrahima Sory Diakité Foussény Fofana Fatoumata b.ldé El Hadj Yaya bah mamadou bassirou Mariama béavogui Mariam Soumaoro Morlaye Camara Abdoulaye Samoura Aly Koïvogui Diarra Koïvogui Kokoulo Diallo Salématou b.ldé mamadou dadhi Cardiology Department CHU Ignace Deen Conakry Guinea CHU Donka National Hemodialysis Center Conakry Guinea

Introduction: Heart and kidney diseases are common among patients admitted to hospital and they coexist in a significant number of cases. The interactions between the cardiovascular system and the kidney have been known and described for many years and have led to the description of cardio-renal syndrome. The objective of this study was to determine the frequency;to describe the clinical, etiological and prognostic aspects of acute renal failure in patients hospitalized for chronic congestive heart failure. Method: This was a descriptive retrospective study from January 2, 2018 to December 31, 2022. Included in this study were all the complete records of patients hospitalized for chronic congestive heart failure with serum creatinine ≥120 μmol/I. We’re not included in this study, incomplete files, records of patients hospitalized for other pathologies, records of patients hospitalized for chronic congestive heart failure with normal renal function. Our study variables were qualitative and quantitative divided into clinical, paraclinical and prognostic data. Our data were analyzed using the EPI-info 7.***.2.6 software. Data entry and presentation were carried out using Word, Excel and PowerPoint from the 2016 Office Pack. Results: We collected 830 files of which 114 met our selection criteria, a frequency of 13.73%. The mean age of the patients was 47 ± 19 years. The F/M sex ratio was 1.23. The dominant etiologies were hypertension followed by diabetes with respectively 60.5% and 23.7%. Toxic factors including tobacco accounted for 7.9% of cases. Dyspnea accounted for 86.8%. Most of our patients were grade 3 or 36% based on systolic blood pressure on admission with an average of 164.16 ± 33.95 mmHg and an average diastolic blood pressure of 93.24 ± 20.40 mmHg. biologically, the serum creatinine revealed a high frequency of 201 - 400 μmol/l (33% of cases) with an average value of 586.49 ± 631.44 μmol/l with the extremes 2.960 and 2448.68 μmol/I. Anemia was moderate in 3

关键词： Cardio-Renal Syndrome Ignace Deen

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Prevalence and Contributing Factors of Orthostatic Hypotension in the Cardiology Department of the CHU Ignace Deen in Conakry

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World Journal of Cardiovascular Diseases 2023年第3期13卷 181-187页

作者： Ibrahima Sory barry El Hadj Yaya b.ldé Ahmed Youssouf Djiba Mariama béavogui mamadou bassirou Mariama bah Morlaye Soumaoro Abdoulaye Camara Aly Samoura Diarra Koïvogui Kokoulo Koïvogui Salématou Diallo Ibrahima Kalil Tounkara Ousmane Djénaba Savané mamadou dadhi b.ldé Department of Cardiology CHU Ignace Deen Conakry Guinea

Introduction: Orthostatic Hypotension (OH) is a frequent situation during consultation in hypertensive patients. The prevalence in the general population increases with age and it is recommended to systematically search for it in patients with multiple comorbidities. The objective of this study was to determine the prevalence of orthostatic hypotension;describe their socio- demographic profile, the various clinical and paraclinical aspects and the predisposing factors of orthostatic hypotension in treated hypertensives, controlled or not. Method: This was a descriptive cross-sectional study, from January 2 to June 30, 2022 in the cardiology department of the Ignace Deen National Hospital. Included in this study were all patients who presented with orthostatic hypotension under antihypertensive treatment, regardless of age and sex, and who agreed to participate in the study. The non-inclusion criteria were hypertensive patients without OH and those who had not agreed to participate in the study. Each patient had blood pressure and heart rate measured in the supine position at room temperature and with an empty bladder. Then the measurement is taken again three (3) minutes after the switch to orthostatism. We retained the diagnosis of OH if the SbP drops by at least 20 mmHg and/or the PAD by at least 10 mmHg three (3) min after the transition to orthostatism. Our data obtained were analyzed in the Epi-info 7.4.0 software. Results: During our study period, we investigated 385 presented with OH, 12.2%. The mean age of the patients was 60.83 years ± 10.01 years and hypertensive patients, 47 of whom the M/F sex ratio was 0.81. In our study, blood pressure was not controlled in 36.2% of our patients with a predominance of grade 3 hypertension, a rate of 55.32%. Renal failure, anemia, heart failure and stroke were the main comorbidities associated with the occurrence of HO. The most incriminated factors were age with a frequency of 74.47%, followed by obesity at 44.68% and

关键词： Orthostatic Hypotension Contributing Factors Conakry

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