Denne side blev automatisk oversat, og nøjagtigheden af ​​oversættelsen er ikke garanteret. Der henvises til engelsk version for en kildetekst.

Pregnancy-Induced Analgesia - A Longitudinal Study of DNIC

17. juni 2013 opdateret af: Ruth Landau, University of Washington
The investigators hypothesize that pregnancy-induced analgesia might be the result of enhanced descending noxious inhibitory activity.

Studieoversigt

Status

Ukendt

Betingelser

Detaljeret beskrivelse

Pregnancy-induced analgesia has been described in several studies (Gintzler 1980; Sander and Gintzler 1987; Jarvis et al. 1997). Obvious mechanisms underlying pregnancy-induced analgesia involve hormonal changes during gestation (Fillingim and Ness 2000). Existing studies during pregnancy and peripartum have focused on standard characteristics of nociception, using non-dynamic quantitative sensory testing such as pain threshold/tolerance or suprathreshold stimuli (Goolkasian and Rimer 1984; Sengupta and Nielsen 1984; Cogan and Spinnato 1986; Dunbar et al. 1988; Whipple et al. 1990; Shapira et al. 1995; Saisto et al. 2001; Bajaj et al. 2002; Carvalho et al. 2006; Ohel et al. 2007), with its relative limitations of studying only the afferent nociceptive input produced in the peripheral nervous system.

The two systems that are of prime importance in pain modulation within the CNS are the inhibitory system (descending noxious inhibitory control (DNIC)) and the excitatory system, with the balance of pain being more heavily influenced by the former (Godfrey and Mackey 2008).

The primary aim of this study is to use psychophysical tests to study both the inhibitory and excitatory pain pathways using the DNIC paradigm and temporal summation longitudinally during pregnancy, compared to an age-matched control group of non-pregnant women.

We added the In Vitro Fertilization (IVF) sub-population to the PIA study to study them as a control group (in addition to studying non-pregnant controls and pregnant women). We are studying this sub population prior to their egg retrieval procedure and a short phone survey with participants post egg-retrieval. If the subject becomes pregnant, we would recruit them to enroll in the PIA pregnant population cohort.

Undersøgelsestype

Observationel

Tilmelding (Forventet)

60

Kontakter og lokationer

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

Studiekontakt

Studiesteder

    • California
      • Stanford, California, Forenede Stater, 94305
        • Rekruttering
        • Stanford University School of Medicine
        • Kontakt:
        • Kontakt:
        • Ledende efterforsker:
          • Brendan Carvalho, MBBCh
    • Washington
      • Seattle, Washington, Forenede Stater, 98195-6540
        • Rekruttering
        • University of Washington
        • Ledende efterforsker:
          • Ruth Landau, MD
        • Kontakt:

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 til 45 år (Voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Kvinde

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

maternity clinic - Pregnant Cohort community sample - Non-pregnant Control Cohort

Beskrivelse

Inclusion Criteria:

  • Pregnant Cohort: Inclusion criteria for participation are (1) women aged between 18 and 45 yr, (2) nulliparous or ASA physical status class I or II women, (3) singleton pregnancy, (4) no more than 14 completed weeks gestational age at the time of enrollment into the study, (5) uncomplicated pregnancy, and (6) delivery planned to be conducted at UW/Stanford University.
  • Non-pregnant Control Cohort: Inclusion criteria for participation are (1) women aged between 18 and 45 yr, (2) nulliparous or ASA physical status class I or II women, (3) and not planning on taking oral-contraceptives or carrying a hormonal-coated IUD.

Non-inclusion Criteria:

  • Pregnant Cohort: Non-inclusion criteria are (1) multiparous women, (2) non-English speaking women (subjects have to be able to understand the DNIC procedure and answer questionnaires), (3) women unable to understand the concept of VNPS at the time of informed consent (involving mental health issues), (4) a history of anxiety or depression, or chronic consumption of opiates, antidepressants, or anticonvulsants; and (5) intake of opioids, acetaminophen, or NSAIDs 48h prior to the psychophysical test.
  • Non-pregnant Control Cohort: Non-inclusion criteria are the same as the Pregnant Cohort as well as (6) irregular menstrual cycles (defined as < 21 days or > 35 days).

Exclusion Criteria:

  • Pregnant Cohort: Exclusion criteria is a pregnancy complicated by preeclampsia or preterm delivery (< 37 weeks gestation).
  • Non-pregnant Control Cohort: Exclusion criteria is development of irregular cycles.

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
1. Pregnant Women
2. Non-Pregnant Controls
3. IVF controls

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Tidsramme
To use psychophysical tests to study both the inhibitory and excitatory pain pathways using the DNIC paradigm and temporal summation longitudinally during pregnancy, compared to an age-matched control group of non-pregnant women.
Tidsramme: Pregnant Cohort - each trimester and postpartum; Control Cohort - twice a menstrual cycle, 4 cycles, over 7 months
Pregnant Cohort - each trimester and postpartum; Control Cohort - twice a menstrual cycle, 4 cycles, over 7 months

Sekundære resultatmål

Resultatmål
Tidsramme
Questionnaires, pain scores, amount of analgesics required, overall experience of labor and delivery
Tidsramme: Questionnaires - Same as Primary Outcome Measure; other three measures - at delivery
Questionnaires - Same as Primary Outcome Measure; other three measures - at delivery

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Samarbejdspartnere

Efterforskere

  • Ledende efterforsker: Ruth Landau, MD, University of Washington

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. marts 2009

Primær færdiggørelse (Forventet)

1. december 2013

Studieafslutning (Forventet)

1. december 2013

Datoer for studieregistrering

Først indsendt

20. marts 2009

Først indsendt, der opfyldte QC-kriterier

23. marts 2009

Først opslået (Skøn)

24. marts 2009

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Skøn)

19. juni 2013

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

17. juni 2013

Sidst verificeret

1. juni 2013

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 35811-A

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 .

Kliniske forsøg med Graviditet

  • NCT03834285
    Rekruttering
    Cirrhose, lever | HELLP syndrom | Intrahepatisk kolestase af graviditet | Graviditetssygdom | AFLP - Acute Fatty Lever of Pregnancy

Søg i lignende forsøg