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Enoxaparin in Children With Asymptomatic Venous Thrombosis After Pediatric Cardiac Surgery

25 agosto 2013 aggiornato da: Brian McCrindle, The Hospital for Sick Children

A Randomized Controlled Trial of Enoxaparin in Children With Asymptomatic Venous Thrombosis After Pediatric Cardiac Surgery

The CATCH-enoxaparin trial is the natural continuation of the CATCH study. It will capitalize on the fact that patients enrolled in the CATCH study will be specifically screened for asymptomatic thromboembolism (TEs) in order to answer important clinical questions.

The investigators propose a randomized controlled trial to address whether, among pediatric patients with congenital heart defects (CHD) recovering from cardiovascular surgery and diagnosed with an asymptomatic venous TE, the use of enoxaparin results in a net therapeutic benefit?

Panoramica dello studio

Stato

Ritirato

Condizioni

Intervento / Trattamento

Descrizione dettagliata

Primary Aim: To address whether, among pediatric patients with congenital heart defects (CHD) recovering from cardiovascular surgery and diagnosed with an asymptomatic venous TE, the use of enoxaparin results in a net therapeutic benefit. We hypothesize that enoxaparin dosed as per age-appropriate algorithms is associated with an increased rate of clot resolution and decreased rate of clot progression/long-term complications in children with CHD and asymptomatic venous TE. Benefits from clot resolution will outweigh the risks associated with the use of enoxaparin resulting in a net therapeutic benefit in favour of enoxaparin use in this context.

Secondary aims of this study are to:

  1. To compare the rate of conversion from asymptomatic to symptomatic TE and/or thromboembolic events between treated and untreated patients. Hypothesis: the use of enoxaparin will significantly reduce the rate of conversion from asymptomatic to symptomatic TE.
  2. To compare the rate of objective clot progression (or regression) by serial imaging with ultrasound and echocardiography between treated and untreated patients. Hypothesis: the use of enoxaparin will significantly increase the rate of clot regression.
  3. To identify factors associated with: TE conversion from asymptomatic to symptomatic, clot resolution and post-thrombotic syndrome in both treated and untreated patients separately. Hypothesis: older children with a more mature coagulation system and those with TEs in superficial vessels (rather than deep/systemic vessels) will have a lower frequency of TE complications.
  4. To establish the rate of bleeding complications (both minor and major) for patients on enoxaparin. Hypothesis: we expect major bleeding complications to be present in 2-3% of treated patients and minor bleeding complications to be frequent.

Tipo di studio

Interventistico

Fase

  • Fase 3

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Luoghi di studio

  • Canada
    • Ontario
      • Toronto, Ontario, Canada, M5V1X8
        • The Hospital for Sick Children

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

Non più vecchio di 18 anni (Bambino, Adulto)

Accetta volontari sani

No

Sessi ammissibili allo studio

Tutto

Descrizione

Inclusion Criteria:

  1. Pediatric patients with a cardiac defect (acquired or congenital)
  2. Recent cardiac surgery (during current hospital admission)3) Presence of a venous clot confirmed by appropriate diagnostic imaging methods associated with either ≥ 25% blood vessel occlusion (clot diameter/vessel diameter) OR is ≥ 3mm in absolute diameter
  3. Enrollment in the Heart Centre Biobank Registry
  4. Enrollment in the CATCH main study

Exclusion Criteria:

  1. Clots associated with any of the following symptoms: swelling, edema, discoloration or high temperature of the affected territory.
  2. Clots in a vascular segment/location (arterial clots, intracardiac clots) or with a degree of vessel occlusion which obligatory warrants treatment
  3. Prosthetic heart valve
  4. Active or previous cancer history
  5. Known congenital coagulopathy or thrombophilic disorder
  6. Liver failure (AST, ALT or % bilirubin 2x normal)
  7. Need for anticoagulation for treatment or prophylaxis for other reasons (e.g. BT shunt, recent thrombosis requiring anticoagulation)
  8. Previous documented residual clot within the same vascular territory affected by current asymptomatic clot
  9. Increased bleeding risk reflected by severe thrombocytopenia (platelet count <30,000/ml) and/or coagulopathy (INR >4.0 or aPTT >120s)
  10. Active bleeding or major bleeding <10 days ago (not surgery related)
  11. Previous neurosurgery <14 days ago
  12. Uncontrolled severe hypertension (>95th percentile for age)
  13. Previous proven diagnosis of heparin-induced-thrombocytopenia (HIT) <100 days ago
  14. Absolute contraindication to heparin/LMWH (e.g. severe heparin allergy)
  15. Pregnancy or breastfeeding
  16. No planned follow-up at The Hospital for Sick Children

While most patients will be identified as part of the CATCH study during the pre-discharge full-body vascular ultrasound, some patients who are not enrolled in CATCH will also be identified if an asymptomatic clot is identified during a clinically indicated radiological study. For those patients who are not already enrolled in the CATCH study and the Heart Centre Biobank Registry, they will be approached and consent will be obtained for those studies prior to enrolment in the CATCH-enoxaparin study.

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Trattamento
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione parallela
  • Mascheramento: Nessuno (etichetta aperta)

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Nessun intervento: Nessun trattamento
Sperimentale: Treatment group

The initial enoxaparin dose will be: 1.75 mg/kg/dose SC q12h for patients ≤ 2 months old or

1 mg/kg/dose SC q12h for patients > 2 months old

Adjust the dose of enoxaparin according to the following monogram. Depending on the Enoxaparin Anti-factor Xa level achieved, successive actions are indicated, including whether to hold the next scheduled dose, whether any dose change is indicated and when the next anti-factor Xa level should be drawn.
Droga: Enoxaparin
Lovenox- Enoxaparin; Sanofi-Aventis Canada Inc.

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Net therapeutic benefit of enoxaparin
Lasso di tempo: Events recording from baseline to 18 months post-surgery
Defined as the between group difference in proportion of patients with negative outcomes (percent clot conversion to symptomatic + percent major bleeding complications)
Events recording from baseline to 18 months post-surgery

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Rate of objective clot size progression (or regression)
Lasso di tempo: Up to 18 months post-surgery
This will be determined by serial imaging with ultrasound and frequency of complete clot resolution at the end of the treatment
Up to 18 months post-surgery
Frequency and Risk Factors for conversion from asymptomatic to symptomatic thromboembolism
Lasso di tempo: Up to 18months post-surgery
Defined as the appearance of any of the following symptoms: swelling, edema, discoloration or high temperature of the affected territory
Up to 18months post-surgery
Frequency of and risk factors for post-thrombotic syndrome
Lasso di tempo: 18 months after surgery
Clinical manifestations include varicose veins, edema, skin hyperpigmentation and skin ulcers
18 months after surgery
Frequency of and risk factors for bleeding complications
Lasso di tempo: Up to 18months
Minor complications and major episodes defined as cerebral, abdominal, retroperitoneal or pulmonary hemorrhage or any bleeding complications requiring blood transfusions
Up to 18months
Neurodevelopment and health re-lated quality of life
Lasso di tempo: 18 months post-surgery
Age appropriate PedsQL® generic module and parent report and Child Health Questionnaire
18 months post-surgery

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

The Hospital for Sick Children

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio

1 agosto 2011

Completamento primario (Anticipato)

1 agosto 2015

Completamento dello studio (Anticipato)

1 agosto 2015

Date di iscrizione allo studio

Primo inviato

15 novembre 2011

Primo inviato che soddisfa i criteri di controllo qualità

17 novembre 2011

Primo Inserito (Stima)

18 novembre 2011

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Stima)

27 agosto 2013

Ultimo aggiornamento inviato che soddisfa i criteri QC

25 agosto 2013

Ultimo verificato

1 agosto 2013

Maggiori informazioni

Termini relativi a questo studio

Parole chiave

Termini MeSH pertinenti aggiuntivi

Altri numeri di identificazione dello studio

  • 1000022022

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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