Sylvain Raoul Simeni Njonnou

Dr. Sylvain Raoul Simeni Njonnou

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Research Focus & Metrics

Academic Career Length

15Years (2012-Present)

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

Representative Publications

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25 January 2020 in Journal of Diabetes Research
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SNSylvain Raoul Simeni Njonnou
Sylvain Raoul Simeni Njonnou
JBJérôme Boombhi
Jérôme Boombhi
MEMartine Claude Etoa Etoga
Martine Claude Etoa Etoga
ATAimée Tiodoung Timnou
Aimée Tiodoung Timnou
AJAhmadou Musa Jingi
Ahmadou Musa Jingi
ESEugène Sobngwi
Eugène Sobngwi
Background. Diabetes is a public health problem worldwide, associated with increased morbidity and mortality. According to the International Diabetes Federation (IDF) 2017 data, around 425 million people worldwide suffer from diabetes. This number is expected to increase to 629 million in 2045. Various occidental studies reported the increased prevalence and lower control of diabetes among prisoners. However, there is no data on the characteristics of inmates with diabetes in sub-Saharan Africa. Methods. A cross-sectional study among incarcerated detainees from the Yaoundé Central Prison was conducted from January to July 2017. Diabetes was defined according to the American Diabetes Association (ADA) criteria. Analyzed variables included phenotypic characteristics, lifestyle, the reason for detention, the sentence severity, and the length of detention. Results. We recruited 437 inmates (344 men) with an average age of 37.0 (95% CI: 35.9-38.3) years. The most frequent age group was 20 to 39 years with 281 (64.7%) inmates, and the mean prison stay was 29.1 (95% CI: 25.7-32.8) months. The prevalence of diabetes in the Yaoundé Central Prison was 9.4%. The main cardiovascular risk factors were a sedentary lifestyle (91.1%), hypertension (39.6%), smoking (31.6%), and alcohol consumption (28.1%). Hypertension (p=0.005), obesity (p=0.0006), smoking (p=0.04), sedentary lifestyle (p=0.04), major crime (p=0.007), and minor crime (p=0.003) were associated with diabetes in univariate analysis. In multivariate analysis, only obesity and sedentary lifestyle were associated with diabetes. Conclusion. Diabetes prevalence in the Yaoundé Central Prison was high, at 9.4%, compared to that in the general population. It was associated with other classical cardiovascular risk factors and factors linked to the sentence (minor and major crimes). This trial is registered with CE00617/CRERSHC/2016.

5 May 2019 in Rheumatology
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SNSylvain Raoul Simeni Njonnou
Sylvain Raoul Simeni Njonnou
MSMuhammad Shahnawaz Soyfoo
Muhammad Shahnawaz Soyfoo
FVFrédéric-Alain Vandergheynst
Frédéric-Alain Vandergheynst

30 June 2020 in BMJ Case Reports
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SNSylvain Raoul Simeni Njonnou
Sylvain Raoul Simeni Njonnou
JDJustine Deuson
Justine Deuson
CRClaire Royer-Chardon
Claire Royer-Chardon
FVFrédéric Alain Vandergheynst
Frédéric Alain Vandergheynst
VWVirginie De Wilde
Virginie De Wilde
TAFRO (thrombocytopenia, anasarca, fever, reticulin myelofibrosis or renal dysfunction and organomegaly) syndrome is a systemic inflammatory disease characterised by thrombocytopenia, anasarca, fever or inflammatory syndrome, reticulin myelofibrosis or renal dysfunction and organomegaly. It was first described as a subtype of idiopathic multicentric Castleman disease. Here, we report the case of a 42-year-old woman presenting with thrombocytopenia, anasarca, inflammatory syndrome, renal insufficiency, reticulin myelofibrosis at bone marrow biopsy and cervical and axillary lymph nodes. Kidney biopsy showed double contours of the glomerular basement membrane, mesangiolysis and endothelial swelling compatible with thrombotic microangiopathy (TMA) as well as with TAFRO syndrome. She was successfully treated by corticosteroids, tocilizumab and rituximab. This new case description of TAFRO syndrome underlines three features of this disease rarely described in the literature and never simultaneously in the same patient: the association to severe hypothyroidism, the presence of TMA-like lesions on kidney biopsy and the treatment by the association of steroids, tocilizumab and rituximab.

12 July 2021 in BMC Gastroenterology
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LDLarissa Pessidjo Djomatcho
Larissa Pessidjo Djomatcho
MKMathurin Pierre Kowo
Mathurin Pierre Kowo
ANAntonin Ndjitoyap Ndam
Antonin Ndjitoyap Ndam
SNSylvain Raoul Simeni Njonnou
Sylvain Raoul Simeni Njonnou
GKGabin Ulrich Kenfack
Gabin Ulrich Kenfack
ONOudou Njoya
Oudou Njoya
Background: Minimal hepatic encephalopathy (MHE) is the presence of neuropsychological abnormalities detectable by psychometric tests. Psychometric Hepatic Encephalopathy Score (PHES) is a gold standard test for the early diagnosis of MHE in cirrhotic patients. The aim of this study was to standardize the PHES in a healthy Cameroonian population and to evaluate the prevalence of MHE among cirrhotic patients. Methods: This was a prospective, multicentric study from 1 December 2018 to 31 July 2019 in two groups: healthy volunteers and cirrhotic patients without clinical signs of hepatic encephalopathy. The results of the number connection test-A, number connection test-B, serial dotting test, line tracing test were expressed in seconds and those of the digit symbol test in points. Results: A total of 102 healthy volunteers (54 men, 48 women) and 50 cirrhotic patients (29 men, 31 women) were included. The mean age was 38.1 ± 12.55 years in healthy volunteers and 49.3 ± 15.6 years in cirrhotic patients. The mean years of education level was 11.63 ± 4.20 years in healthy volunteers and 9.62 ± 3.9 years in cirrhotic patients. The PHES of the healthy volunteer group was − 0.08 ± 1.28 and the cut-off between normal and pathological values was set at − 3 points. PHES of the cirrhotic patients was − 7.66 ± 5.62 points and significantly lower than that of volunteers (p < 0.001). Prevalence of MHE was 74% among cirrhotic patients. Age and education level were associated with MHE. Conclusion: PHES cut-off value in Cameroonians is − 3, with MHE prevalence of 74% among cirrhotic patients.

9 December 2022 in Journal of Medical Case Reports
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SNSylvain Raoul Simeni Njonnou
Sylvain Raoul Simeni Njonnou
SASandrine Aspeslagh
Sandrine Aspeslagh
MEMarie-Josiane Ntsama Essomba
Marie-Josiane Ntsama Essomba
MRMarie-Lucie Racu
Marie-Lucie Racu
FLFernando Kemta Lekpa
Fernando Kemta Lekpa
FVFrédéric Vandergheynst
Frédéric Vandergheynst
Background: Immune checkpoint inhibition with anti-PD(L)1 and anti-CTLA4 antibodies has significantly changed cancer treatment during the last 10 years. Nevertheless, boosting the immune system with immune checkpoint inhibition can result in immune-related adverse events, affecting different organ systems, among which the endocrine system is the most affected. However, there are few descriptions of the association of immune-related adverse events, and the pathophysiology of some is still lacking. Case summary: Here, we report a 70-year-old Caucasian patient treated with nivolumab (anti-PD1 monoclonal antibody) after resection of a unique relapse of melanoma in the neck region who presented with sicca syndrome, extreme fatigue, and weight loss 6 months after the start of anti-PD1 therapy. Blood tests revealed hypoglycemia and secondary hypocortisolism due to isolated adrenocorticotrophic hormone deficiency. Interestingly, brain methionine positron emission tomography/magnetic resonance revealed physiological metabolism of the pituitary gland, which was not increased in size, and no hypophyseal metastasis was detected. The sicca syndrome investigation revealed the absence of anti-SSA/SSB antibodies, while the labial salivary gland biopsy showed lymphoplasmatocytic infiltrates with a focus score of 1. To provide new insights into the physiopathology of the anti-PD1-related sialadenitis, we investigated the distribution of aquaporins 5 by immunostaining on the labial salivary gland acini, and compared this distribution with the one expressed in the primary Sjögren’s syndrome. Contrary to patients with primary Sjögren’s syndrome (in whom aquaporins 5 is mainly expressed at the basolateral side), but similar to the patients with no sialadenitis, we observed expression of aquaporins 5 at the apical pole. This new finding deserves to be confirmed in other patients with anti-PD1-related sialadenitis. Owing to these immune-related adverse events, anti-PD1 was stopped; nevertheless, the patient developed a new relapse 1 year later (March 2020) in the neck region, which was treated by radiotherapy. Since then, no relapse of melanoma was seen (1.5 years after radiotherapy), but the patient still requires hypophyseal replacement therapy. The sialoadenitis resolved partially. Conclusion: We report a combination of sialoadenitis and hypophysitis explaining extreme fatigue in a patient who was treated in the adjuvant setting with anti-PD1 for a melanoma relapse.

1 July 2020 in BMJ Case Reports
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SNSylvain Raoul Simeni Njonnou
Sylvain Raoul Simeni Njonnou
SHSophie Henrard
Sophie Henrard
LNLamya Noure
Lamya Noure
JGJean-Christophe Goffard
Jean-Christophe Goffard
Biktarvy (bictegravir/emtricitabine/tenofovir alafemanide), which has been recently approved for the treatment of HIV, is a single-pill regimen that associates bictegravir and a novel integrase strand transfer inhibitor (INSTI) with a combination of two nucleoside reverse transcriptase inhibitors (NRTI) of emtricitabine and tenofovir alafemanide. Among treatment complications, rhabdomyolysis has been reported in association with some NRTI and INSTI but never with bictegravir. Acute pancreatitis has also been reported recently with another INSTI, dolutegravir. We report here a 62-year-old man with diabetes and HIV infection, and receiving Biktarvy for 1 month. He presented to the emergency department for muscular pain and fatigue. He was on treatment with Descovy (tenofovir alafenamide/emtricitabine) and Viramune (nevirapine) for 2 years but he recently asked for a regimen simplification. Severe rhabdomyolysis and acute pancreatitis were diagnosed. Although the aetiology of these events could be multifactorial, it cannot be ruled out that this episode could be linked to a potential side effect of bictegravir.