Microparticles in Scuba Divers With Decompression Sickness
18. august 2016 opdateret af: University of Pennsylvania
Phase 1 Study Investigating Alterations of Circulating Microparticles in Scuba Divers With Decompression Sickness
The investigators hypothesize that membrane microparticles (MPs) are liberated into the blood stream in response to decompression stress and that certain MPs characteristics initiate inflammatory responses that contribute to the clinical syndrome the investigators call decompression sickness.
The research goal is to evaluate the number, type and time-course for elevations in MPs in sport SCUBA divers who present for treatment of decompression sickness.
Blood samples are to be taken from consenting patients before and after they undergo treatment for decompression sickness and at a follow-up clinic visit from 1 to 3 weeks later (three samples total).
Studieoversigt
Status
Afsluttet
Betingelser
Detaljeret beskrivelse
Microparticles (MPs) are small membrane bound vesicles shed from the surface of a variety of cells by what appear to be well regulated processes.
They are elevated in many physiological and disease states and in some instances have been associated with organ injury.
Shear stress - as can be caused by intravascular bubbles - is one of the stimuli known to cause cells to release microparticles.
Most sport SCUBA dives have been shown to generate intravascular bubbles - even safe dives well within limits established by the US Navy and sports authorities.
The investigators have reported elevations in several sub-types of MPs in a group of individuals undergoing a well monitored series of open-water SCUBA dives.
There is no information of the occurrence of MPs in injured divers.
The investigators have published results using a murine model which demonstrated that mice subjected to varying decompression stresses exhibit progressive elevations in circulating MPs derived from leukocytes, erythrocytes, platelets and endothelial cells.
Using novel interventions the investigators demonstrated that MPs cause intravascular neutrophil activation and inflammatory perivascular injuries.
Therefore, there is pathophysiological information to suggest that one or more element of MPs (number and/or pro-inflammatory subtype) may be proximal elements that precipitate the clinical syndrome the investigators call decompression sickness.
Undersøgelsestype
Observationel
Tilmelding (Faktiske)
1
Kontakter og lokationer
Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.
Studiesteder
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Pennsylvania
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Philadelphia, Pennsylvania, Forenede Stater, 19104-6068
- University of Pennsylvania
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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
Ingen
Køn, der er berettiget til at studere
Alle
Prøveudtagningsmetode
Ikke-sandsynlighedsprøve
Studiebefolkning
SCUBA divers over age 21 that present for evaluation of suspected decompression sickness
Beskrivelse
Inclusion Criteria:
- Patients who are given the diagnosis of decompression sickness will be offered entry into this study
Exclusion Criteria:
- Inability to provide informed consent
Studieplan
Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Observationsmodeller: Kun etui
- Tidsperspektiver: Fremadrettet
Kohorter og interventioner
Gruppe / kohorte |
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Divers with decompression sickness
The sole group under study is SCUBA divers who have sustained decompression sickness
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Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
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Microparticle elevations in injured divers
Tidsramme: four years
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We will quantify microparticles in plasma by standard flow cytometry techniques.
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four years
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Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
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Microparticle sub-types in injured divers
Tidsramme: four years
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We will evaluate sub-types of microparticles to determine their cells of origin.
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four years
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Neutrophil activation in injured divers
Tidsramme: four years
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We will evaluate presence of neutrophil activation in injured divers.
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four years
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Samarbejdspartnere og efterforskere
Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.
Sponsor
Efterforskere
- Ledende efterforsker: Stephen R Thom, MD,PhD, University of Pennsylvania
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
- Thom SR, Yang M, Bhopale VM, Huang S, Milovanova TN. Microparticles initiate decompression-induced neutrophil activation and subsequent vascular injuries. J Appl Physiol (1985). 2011 Feb;110(2):340-51. doi: 10.1152/japplphysiol.00811.2010. Epub 2010 Oct 21.
- Yang M, Milovanova TN, Bogush M, Uzun G, Bhopale VM, Thom SR. Microparticle enlargement and altered surface proteins after air decompression are associated with inflammatory vascular injuries. J Appl Physiol (1985). 2012 Jan;112(1):204-11. doi: 10.1152/japplphysiol.00953.2011. Epub 2011 Sep 29.
- Thom SR, Milovanova TN, Bogush M, Bhopale VM, Yang M, Bushmann K, Pollock NW, Ljubkovic M, Denoble P, Dujic Z. Microparticle production, neutrophil activation, and intravascular bubbles following open-water SCUBA diving. J Appl Physiol (1985). 2012 Apr;112(8):1268-78. doi: 10.1152/japplphysiol.01305.2011. Epub 2012 Feb 9.
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
1. august 2011
Primær færdiggørelse (Faktiske)
1. september 2014
Studieafslutning (Faktiske)
1. september 2014
Datoer for studieregistrering
Først indsendt
23. april 2012
Først indsendt, der opfyldte QC-kriterier
27. april 2012
Først opslået (Skøn)
30. april 2012
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
22. august 2016
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
18. august 2016
Sidst verificeret
1. august 2016
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- 814139
Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .
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