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Bariatric Surgery, Arterial Stiffness and Target Organ Damage Study (BASTOD) (BASTOD)

30. november 2016 oppdatert av: University Hospital, Montpellier

Longitudinal Assessment of the Effect of Bariatric Surgery on Arterial Function and Blood Pressure Target Organs Damage

Introduction:

Obesity is a major public health problem, associated with many morbidities, including metabolic and cardiovascular disease (CVD). High blood pressure (hypertension) is the most common comorbidity and one of the major risk factors for CVD and kidney failure. It has been described an almost linear relationship between body mass index (BMI) and the level of blood pressure (BP), but the mechanisms underlying this relationship are complex and incompletely understood : activation of renin-angiotensin-aldosterone and sympathetic nervous systems, alterations in systemic hemodynamics and arterial parameters; a significant correlation between overall and / or visceral obesity and arterial stiffness assessed by carotid-femoral pulse wave velocity (PWV) has been observed.

By its effectiveness in terms of magnitude and sustainability of weight loss, bariatric surgery is becoming increasingly important in the management of obesity and the prevention of its comorbidities. It reduces all-cause as well as CV mortality. Bariatric surgery allows a resolution of the metabolic syndrome (in 2 out of 3 patients) and diabetes (in 5 out of 6 patients), but its effect on blood pressure remains inconstant and transient. The reasons for this limitation and the detailed effects of bariatric surgery on hemodynamics and arterial parameters have been poorly studied. Of note, a reduction in left ventricular hypertrophy, an improvement in diastolic dysfunction and aortic distensibility assessed by ultrasound or MRI have been observed.

Studieoversikt

Detaljert beskrivelse

Objective:

The study aims to (a) estimate the effects of bariatric surgery on the function of large arteries (determined non-invasively by measurement of PWV, pressure central reflection wavelength) in a population of obese grade 2 or 3, and (b) evaluate the respective role of weight loss, the change in metabolic parameters, and the decline in BP on changes in the function of large arteries and on markers of target organ alterations after surgery.

Methods:

This is a prospective longitudinal study with assessment of arterial stiffness before and after 6 and 12 months following bariatric surgery. Ninety grade 2-3 obese patients with an indication of bariatric surgery will be included. Arterial stiffness is estimated by the aortic PWV (SphygmoCor®) at baseline and after 6 and 12 months following surgery. Changes in the central pressure, wave reflection, the PA device, and markers of target organ alteration (left ventricular mass, LVM, glomerular filtration rate, GFR, urinary albumin excretion, EUA; caliber of retinal vessels as assessed by retinography) will be the secondary objectives.

To study the evolution of PWV in connection with weight loss, a linear mixed model is used based on data collected for each patient every time. Correlations between different parameters will be studied each time. Changes in secondary endpoints over time will be correlated to changes in weight, BMI, percentage loss of excess weight and blood pressure.

Expected results and their prospects:

Weight loss surgery should lead to a rapid and sustained weight loss, improved arterial function parameters (BP, arterial stiffness) and markers of target organ damage (GFR, UAE, LVM, caliber of retinal vessels).

The analysis of the relation between the metabolic / hemodynamic responses and target organ damage should enable us to identify consistent pathophysiological mechanisms, and refine our understanding of the consequences of bariatric surgery.

Studietype

Observasjonsmessig

Registrering (Faktiske)

90

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiesteder

      • Montpellier, Frankrike, 34925
        • University Hospital

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

18 år til 60 år (Voksen)

Tar imot friske frivillige

Nei

Kjønn som er kvalifisert for studier

Alle

Prøvetakingsmetode

Ikke-sannsynlighetsprøve

Studiepopulasjon

obese patient candidate for bariatric surgery

Beskrivelse

Inclusion criteria:

  • BMI > 40 kg/m2 or BMI 35-40 with major comorbidities
  • Age between 18-60 years
  • Obesity evolving for more than 5 years
  • Failure of medical treatment
  • Elimination of hormonal causes

Exclusion criteria:

  • Uncontrolled hypertension (SBP > 160 mmHg and DBP> 100 mmHg).
  • History of cardiovascular disease or signs of clinical atheroma: stroke, myocardial infarction and coronary heart disease (angina), peripheral arterial disease (no pulse, claudication), aortic aneurysm (anterior abdominal palpation or imaging ), carotid bruit
  • Plasma creatinine > 130 micromol/L and/or proteinuria > 300 mg/24 h and/or dipstick hematuria.

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Arterial stiffness
Tidsramme: 6 and 12 month (plus or minus 30 days) after bariatric surgery
Change in Arterial stiffness at 6 and 12 months(determined non-invasively by measurement of PWV, central pressure and reflection wavelength)
6 and 12 month (plus or minus 30 days) after bariatric surgery

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Changes at 6 and 12 months
Tidsramme: at 6 and 12 months
Changes at 6 and 12 months in central pressure, wave reflection, blood pressure , and target organ damage (left ventricular mass, glomerular filtration rate, urinary albumin excretion, caliber of retinal vessels)
at 6 and 12 months

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Etterforskere

  • Hovedetterforsker: Matthieu Sardinoux, M.D., UH Montpellier

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart

1. desember 2011

Primær fullføring (Faktiske)

1. januar 2015

Studiet fullført (Faktiske)

1. mars 2016

Datoer for studieregistrering

Først innsendt

17. november 2011

Først innsendt som oppfylte QC-kriteriene

15. desember 2011

Først lagt ut (Anslag)

16. desember 2011

Oppdateringer av studieposter

Sist oppdatering lagt ut (Anslag)

1. desember 2016

Siste oppdatering sendt inn som oppfylte QC-kriteriene

30. november 2016

Sist bekreftet

1. november 2016

Mer informasjon

Begreper knyttet til denne studien

Ytterligere relevante MeSH-vilkår

Andre studie-ID-numre

  • 8686
  • 2010-A01447-32 (Annen identifikator: AFSSAPS)

Denne informasjonen ble hentet direkte fra nettstedet clinicaltrials.gov uten noen endringer. Hvis du har noen forespørsler om å endre, fjerne eller oppdatere studiedetaljene dine, vennligst kontakt register@clinicaltrials.gov. Så snart en endring er implementert på clinicaltrials.gov, vil denne også bli oppdatert automatisk på nettstedet vårt. .

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