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Hélène Che, Christian Roux, Adrien Etcheto, Anya Rothenbuhler, Peter Kamenicky, Agnès Linglart, and Karine Briot

Objective

Adults with X-linked hypophosphatemia (XLH) may suffer from skeletal symptoms leading to functional disability. No data on their quality of life (QoL) have been reported so far. Our objectives were to evaluate the QoL and its determinants in XLH adults.

Patients and methods

We conducted a prospective study in XLH adults, who consulted for musculoskeletal symptoms between 2013 and 2014. We assessed their QoL using HAQ, RAPID3 and SF36, and analysed the variables associated with low QoL. We compared their QoL to that of patients affected with axial spondyloarthritis (ax-SpA) (paired on age and gender), a rheumatologic disorder with a known low QoL.

Results

Fifty-two XLH adults (37 women (71.1%); mean age 41.8±13.3 years) were included; 44 (84.6%) patients had an altered QoL. Increased age and presence of structural lesions were significantly associated with worse QoL (HAQ, RAPID3) (P<0.05). Presence of enthesopathies was significantly associated with worse RAPID3 (OR=4.45 (1.09–18.29), P=0.038). Treatment with phosphate supplements and vitamin D in XLH adults were significantly associated with a better SF36-mental component score (OR=0.14 (0.03–0.57), P=0.007 and OR=0.26 (0.07–0.98), P=0.047 respectively). QoL was significantly worse in XLH than in ax-SpA adults (VAS pain, SF36-PCS, RAPID3) (P<0.05).

Conclusion

Our study showed i) QoL of XLH adults is altered and significantly worse than that of ax-SpA patients (VAS pain, SF36-PCS and RAPID3), ii) structural lesions and especially enthesopathies are associated with a worse QoL and iii) treatment using phosphate supplements and/or vitamin D is associated with a better mental health score.

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Arrate Pereda, Francesca M Elli, Suzanne Thiele, Luisa de Sanctis, Anya Rothenbuhler, Patrick Hanna, Bruno Francou, Diana Alexandra Ertl, Guiomar Perez de Nanclares, Agnès Linglart, and Giovanna Mantovani

Objective

Pseudohypoparathyroidism and related disorders belong to a group of heterogeneous rare diseases that share an impaired signaling downstream of Gsα-protein-coupled receptors. Affected patients may present with various combination of symptoms including resistance to PTH and/or to other hormones, ectopic ossifications, brachydactyly type E, early onset obesity, short stature and cognitive difficulties. Several years ago we proposed a novel nomenclature under the term of inactivating PTH/PTHrP signaling disorders (iPPSD). It is now of utmost importance to validate these criteria and/or improve the basis of this new classification.

Design

Retrospective study of a large international series of 459 probands and 85 relatives molecularly characterized.

Methods

Information on major and minor criteria associated with iPPSD and genetic results were retrieved from patient files. We compared the presence of each criteria according to the iPPSD subtype, age and gender of the patients.

Results

More than 98% of the probands met the proposed criteria for iPPSD classification. Noteworthy, most patients (85%) presented a combination of symptoms rather than a single sign suggestive of iPPSD and the overlap among the different genetic forms of iPPSD was confirmed. The clinical and molecular characterization of relatives identified familial history as an additional important criterion predictive of the disease.

Conclusions

The phenotypic analysis of this large cohort confirmed the utility of the major and minor criteria and their combination to diagnose iPPSD. This report shows the importance of having simple and easily recognizable signs to diagnose with confidence these rare disorders and supports a better management of patients.

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Yasmine El Allali, Coralie Hermetet, Justine Bacchetta, Cyril Amouroux, Anya Rothenbuhler, Valérie Porquet-Bordes, Marie-Alexandrine Champigny, Sabine Baron, Pascal Barat, Helene Bony-Trifunovic, Karine Bourdet, Kanetee Busiah, Maryse Cartigny-maciejewski, Florence Compain, Regis Coutant, Jessica Amsellem-jager, Marc De Kerdanet, Nathalie Magontier, Brigitte Mignot, Odile Richard, Sylvie Rossignol, Soskin Sylvie, Aurélie Berot, Naud-saudreau Catherine, Jean-pierre Salles, Agnès Linglart, Thomas Edouard, and Anne Lienhardt-Roussie

Aim: To describe the presenting features and molecular genetics of primary hyperparathyroidism (PHPT) in the paediatric population.

Methods: Retrospective study of 63 children diagnosed with primary PHPT from 1998 to 2018.

Results: Compared to older children, infants were often asymptomatic (54 vs. 15%, p = 0.002) with a milder form of PHPT. When symptomatic, children and adolescents mostly presented with non-specific complaints such as asthenia, depression, weight loss, vomiting or abdominal pain. A genetic cause of PHPT was identified in about half of this cohort (52%). The infancy period was almost exclusively associated with mutation in genes involved in the calcium-sensing receptor (CaSR) signalling pathway (i.e. CaSR and AP2S1 genes, ‘CaSR group’; 94% of mutated infants) whereas childhood and adolescence were associated with mutation in genes involved in parathyroid cell proliferation (i.e. MEN1, CDC73, CDKN1B and RET genes, ‘cell proliferation group’; 69% of mutated children and adolescents). Although serum calcium levels did not differ between the 2 groups (p = 0.785), serum PTH levels and the urinary calcium/creatinine ratio were significantly higher in ‘cell proliferation group’ patients compared to those in the ‘CaSR group’ (p = 0.001 and 0.028, respectively).

Conclusion: Although far less common than in adults, PHPT can develop in children and is associated with significant morbidity. Consequently, this diagnosis should be considered in children with non-specific complaints and lead to monitoring of mineral homeostasis parameters. A genetic cause of PHPT can be identified in about half of these patients.