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External Validation of IRRIV Test Relationship With Renal Functional Reserve (IRRIV-RFR)

27. november 2018 opdateret af: Sara Samoni, Ospedale San Bortolo di Vicenza

The Relationship Between IRRIV and RFR Under Normal Conditions: External Validation

The assessment of renal functional reserve (RFR) has been proposed for the risk stratification of patients undergoing potentially nephrotoxic procedures. The investigators hypothesized that there is a correlation between IRRIV and RFR under normal conditions. For this purpose, externally validation of IRRIV test is performed in a validation cohort of healthy subjects.

Studieoversigt

Status

Afsluttet

Betingelser

Detaljeret beskrivelse

Normal subjects display a significant capacity to increase in baseline GFR under physiological needs (e.g. pregnancy) or pathological states (e.g. solitary kidney). This capacity is known as renal functional reserve (RFR), and it is calculated as the difference between the measured maximum GFR achieved through a renal stress test and the baseline GFR measured in rest conditions.In clinical practice, the most common renal stress test is performed as a standardized protein loading test. In a pilot study, the investigators demonstrated a significant correlation between RFR and the intra-parenchymal renal resistive index variation (IRRIV) during an echo renal stress test in a cohort of healthy volunteers. IRRIV test has proven to be rapid, safe, bedside and easy to perform and it might represent a preliminary test in screening patients' RFR. For this purpose, externally validation of IRRIV test is performed in a validation cohort of healthy subjects.

Undersøgelsestype

Observationel

Tilmelding (Faktiske)

47

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

18 år og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

Healthy subjects undergoing a protein loading and IRRIV test evaluation

Beskrivelse

Inclusion criteria were:

  • Age more than 18 years old;
  • Baseline estimated GFR, calculated using the chronic kidney disease epidemiology collaboration (CKD-EPI) equation, greater than or equal to 60 ml/min/1.73 m2.

Exclusion criteria were:

  • Age less than 18 years old;
  • Comorbidities potentially affecting renal function (i.e. arterial hypertension, diabetes, vasculopathy, etc.;
  • Chronic administration of drugs able to modify renal blood flow and/or GFR (angiotensin converting enzyme-inhibitors (ACEI), angiotensin receptor blockers (ARB), calcium channel blockers, loop diuretics etc.);
  • Pregnancy;
  • Ultrasound evidence of morphological kidney abnormalities and/or renal artery stenosis;
  • Nonsteroidal anti-inflammatory drugs (NSAIDs) or contrast media in the 2 days before the tests.

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
Healthy Subjects
All subjects underwent protein loading test and IRRIV test on the same day. The renal resistive index (RRI) measurements were performed by one trained sonographer using a multi-frequency convex probe through a manual RRI calculations. The RRIs were measured on three interlobular arteries (superior, middle and inferior) in each kidney, and expressed as a mean value. RFR was measured using an oral protein loading test and was then defined as the difference between the highest CrCl obtained after the protein load and the baseline CrCl measured on rest conditions. Urinary creatinine and sCr were measured by the enzymatic method (IL testTM Instrumentation(R), Laboratory SpA, Milano, Italy) and by ILab650 (Instrumentation Laboratory, Werfen Group, Barcelona, Spain).

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Externally validate IRRIV test
Tidsramme: Change from baseline to 60 minutes
A weight of 10% of the patient's body weight was applied on the abdomen. RRIs were recorded in a middle interlobular artery, every minute for 10 minutes during the echo-renal stress test. The lowest RRI reached was taken as reference (stress RRI). The IRRIV was defined as the percentage difference between baseline RRI and stress RRI.
Change from baseline to 60 minutes

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Correlation between IRRIV test and RFR
Tidsramme: Change from baseline to 60 minutes
Correlation between IRRIV and RFR is tested through a Pearson analysis. Concordance between presence of RFR (i.e. a RFR≥15ml/min/1.73m2) and a positive/uncertain/negative IRRIV is evaluated.
Change from baseline to 60 minutes

Samarbejdspartnere og efterforskere

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Sponsor

Ospedale San Bortolo di Vicenza

Efterforskere

  • Studieleder: Claudio Ronco, MD, Ospedale San Bortolo di Vicenza

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

Hjælpsomme links

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 (Faktiske)

2. september 2015

Primær færdiggørelse (Faktiske)

30. november 2015

Studieafslutning (Faktiske)

10. januar 2016

Datoer for studieregistrering

Først indsendt

26. november 2018

Først indsendt, der opfyldte QC-kriterier

26. november 2018

Først opslået (Faktiske)

28. november 2018

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

29. november 2018

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

27. november 2018

Sidst verificeret

1. november 2018

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • 0103/15

Plan for individuelle deltagerdata (IPD)

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