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Sexual and Urinary Dysfunctions in Generalized Myasthenia (MYAOUS)

26. juni 2026 opdateret af: Centre Hospitalier Universitaire de Nice

Sexual and Urinary Dysfunctions in Generalized Myasthenia: Impact on Quality of Life - the MYAOUS Study

Myasthenia gravis is an autoimmune disease caused by specific autoantibodies that disrupt the function of the neuromuscular junction. It manifests as excessive fatigue of the skeletal muscles during physical exertion and affects 15,000 people in France. Initial symptoms are most often ocular (ptosis, diplopia) but can later spread throughout the body, potentially leading in some cases to respiratory failure and/or swallowing difficulties (myasthenic crisis) or even death. This condition is currently being managed more effectively through treatment, and the invisible symptoms (sexual dysfunction, sphincter dysfunction, psychological impact, etc.) may ultimately be more debilitating than the initial symptoms, which are often controlled by maintenance and/or symptomatic treatments. The impact of myasthenia gravis on intimate life remains a taboo subject and is poorly understood by both the medical community and patients. In the literature, only a single article from 2021 addresses sexual dysfunction in patients with myasthenia gravis. Urinary disorders in myasthenia gravis are frequently reported but have also been little studied.

A national survey, conducted using an online questionnaire distributed by patient associations, shed light on the disease's impact on patients' intimate lives. In this study of 190 patients, 46 of them responded to the question about sexual function, and one in two patients reported sexual complaints; in 46% of cases, this disorder significantly impacted the patients' daily lives. In particular, a decrease in the frequency of sexual intercourse with a partner was noted in 55% of cases, as well as a decrease in sexual desire in 51% of cases.

Sexual dysfunction is very common and underreported in many chronic neurological diseases. The Sexual Complaints Screener (SCS W/M) questionnaires for women and men in English have very recently been validated in French (Questionnaires de Plaintes Sexuelles, QPS F/H).

It now have a 10-item self-administered questionnaire that assesses the full range of sexual disorders and their impact.

In conclusion, while the visible symptoms of myasthenia gravis are widely recognized, the invisible symptoms-such as genitourinary and sphincter disorders-remain largely unrecognized and underdiagnosed. It is therefore essential to conduct systematic screening in order to best guide our patients and thereby improve their quality of life.

Studieoversigt

Status

Ikke rekrutterer endnu

Betingelser

Intervention / Behandling

Undersøgelsestype

Observationel

Tilmelding (Anslået)

150

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiekontakt

Studiesteder

      • Nice, Frankrig, 06000
        • Nice University Hospital
        • Ledende efterforsker:
          • Saskia Bresch
        • Kontakt:
      • Paris, Frankrig, 75000
        • APHP and Myology institute
        • Kontakt:
        • Ledende efterforsker:
          • Sophie DEMERET

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

  • Voksen
  • Ældre voksen

Tager imod sunde frivillige

Ingen

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

Myasthenic patients

Beskrivelse

Inclusion Criteria:

  1. Minimum age of 18 years at the time the informed consent form is obtained.
  2. Confirmed diagnosis of generalized autoimmune myasthenia gravis, including at least two of the following:

    1. Typical clinical features assessed by a physician specializing in myasthenia gravis
    2. A decrease of ≥ 10% during repeated nerve stimulation (3-5 Hz) or increased irregularity on a single-fiber electromyogram
    3. A positive edrophonium test or response to anticholinesterase agents
    4. Serum anti-AChR or anti-MuSK antibodies.
  3. Enrolled in or covered by a social security program in accordance with current regulations governing research involving human subjects.

Exclusion Criteria:

  1. Pregnant (at the time of enrollment)
  2. Postpartum < 6 months
  3. Severe cognitive impairment or under legal guardianship, making it impossible to understand or complete self-administered questionnaires.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Kohorter og interventioner

Gruppe / kohorte
Intervention / Behandling
Myasthenic patient with genitourinary and sphincter disorders
no intervention

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Classification of Sexual Dysfunction in Patients with Generalized Autoimmune Myasthenia
Tidsramme: At inclusion
The sexual complaints questionnaire (QPS questionnaire) assesses sexual complaints over the past six months-on a scale of 0 to 9
At inclusion

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Assessment of Bladder and Sphincter Disorders
Tidsramme: at inclusion
Urinary Symptoms Questionnaire score from 0 to 21
at inclusion
Evaluation of Anorectal Disorders
Tidsramme: at inclusion
The Neurogenic Bowel Dysfunction Score is a questionnaire used to assess the main digestive symptoms in people with diseases score 0 to 10
at inclusion
The Impact of Myasthenia on Daily Life
Tidsramme: at inclusion
Myasthenia Gravis Activities of Daily Living (MG-ADL) questionnaire - score 0 to 24
at inclusion
Impact of Myasthenia Gravis on Quality of Life
Tidsramme: at inclusion
The Myasthenia Gravis Quality of Life - 15 items (MGQOL-15) is a myasthenia-specific tool consisting of 15 patient-reported items that assesses the physical, psychological, and social domains commonly affected by myasthenia over the past few weeks
at inclusion
Health-Related Quality of Life impact
Tidsramme: at inclusion
Health-Related Quality of Life Questionnaire - measures self-reported health on a scale ranging from 0 to 100
at inclusion
the impact of fatigue on daily life
Tidsramme: at inclusion
The quality of life item banks for adults with neurological disorders questionnaire : NeuroQoL Fatigue Short Form is a brief, validated questionnaire that measures the impact of fatigue on the daily lives of patients with neurological disorders and consists of 8 questions
at inclusion

Samarbejdspartnere og efterforskere

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Sponsor

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Anslået)

30. juli 2026

Primær færdiggørelse (Anslået)

30. juli 2030

Studieafslutning (Anslået)

30. juli 2030

Datoer for studieregistrering

Først indsendt

23. juni 2026

Først indsendt, der opfyldte QC-kriterier

26. juni 2026

Først opslået (Faktiske)

1. juli 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

1. juli 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

26. juni 2026

Sidst verificeret

1. juni 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 25-PP-12

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

UBESLUTET

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