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Prospective Study on Preoperative Versus Postoperative Venous Thromboprophylaxis in Patients Undergoing Major Colorectal Surgery
PROSPECTIVE STUDY ON PREOPERATIVE VERSUS POSTOPERATIVE VENOUS THROMBOPROPHYLAXIS IN PATIENTS UNDERGOING MAJOR COLORECTAL SURGERY
Patients undergoing major colorectal surgery are at increased risk for VTE (deep venous thrombosis) compared with patients undergoing other general surgical procedures (Bergqvist et al. Dis. Col. Rectum. 2006; 49: 1620-1628.)
The reported incidence of symptomatic VTE after colorectal surgery is approximately 4% (Monn, F. et al. JACS. 216; 2013: 395-401). However, the reported incidence of VTE after colorectal surgery in prospectively followed patients managed with perioperative venous thromboprophylaxis undergoing screening venography prior to hospital discharge ranges from 9 to 20% (Bergovist et al. NEJM 346; 2002: 975-980; McLeod et al. Ann. Surg. 233; 2000: 438-444; ENOXACAN Study group. Brit. J. Surg. 84; 1997: 1099-1103.
The Surgical Care Improvement Project (SCIP) and the American College of Chest Physician (ACCP) guidelines recommend that venous thromboprophylaxis be initiated within 24 hours of surgery. However, it is believed that deep venous thrombosis occurs during surgery, rather than in the postoperative period, justifying preoperative initiation of venous thromboprophylaxis. This practice is accompanied with a theoretically higher risk of bleeding complications.
Currently there is no consensus on the precise timing of VTE prophylaxis after major colorectal surgery, as demonstrated by the vague guidelines established by the ACCP and SCIP. Current studies on VTE prophylaxis report preoperative initiation of VTE prophylaxis. However, majority of surgeons at our institution begin heparin postoperatively given concern for bleeding complications with preoperative dosing of heparin.
The purpose of this study is to prospectively evaluate the incidence of VTE and major bleeding complications in patients undergoing major colorectal surgery who are treated with preoperative or postoperative venous thromboprophylaxis and to help establish more stringent guidelines on the optimal timing of VTE prophylaxis.
Studie Overzicht
Studietype
Inschrijving (Werkelijk)
Fase
- Fase 3
Contacten en locaties
Studie Locaties
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California
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Los Angeles, California, Verenigde Staten, 90048
- Cedars Sinai Medical Center
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Deelname Criteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
Accepteert gezonde vrijwilligers
Geslachten die in aanmerking komen voor studie
Beschrijving
Inclusion Criteria:
- Able to freely give written informed consent to participate in the study and have signed the Informed Consent Form;
- Males or females, age 18 and older at the time of study screening;
- American Society of Anesthesiologists (ASA) Class I-III (Appendix III);
- Due to undergo major colorectal surgery via laparotomy or laparoscopy
Exclusion Criteria:
- Mentally incompetent or unable or unwilling to provide informed consent or comply with study procedures;
- American Society of Anesthesiologists (ASA) Class IV or V;
- Children <18
- Pregnant patients
- Current/Active DVT
- Patients on therapeutic anticoagulation for DVT or PE at time of surgery
- Patients on anticoagulation for other medical problem (Heart Valve/atrial fibrillation) at the time of surgery
- Patients with IVC filter
- History of allergy to heparin products
- History of heparin induced thrombocytopenia (HIT)
- Patients with recent or active hemorrhage (GI/intracranial, etc) felt by the attending surgeon to be a contraindication to heparin thromboprophylaxis
- Patients with Epidural analgesia
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
- Primair doel: Preventie
- Toewijzing: Gerandomiseerd
- Interventioneel model: Parallelle opdracht
- Masker: Geen (open label)
Wapens en interventies
Deelnemersgroep / Arm |
Interventie / Behandeling |
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Actieve vergelijker: Post-op Heparin
Postoperative venous thromboprophylaxis (Control Arm/current standard practice: subcutaneous Heparin 5000 units started 23 hours after the end of surgery and continued every 8 hours for the remainder of the patients hospital course
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Subcutaneous Heparin 5000 Units given in the preoperative area one hour prior to surgery and continued every 8 hours for the remainder of the patients hospital course
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Experimenteel: Pre-op Heparin
Treatment arm: subcutaneous Heparin 5000 Units given in the preoperative area one hour prior to surgery and continued every 8 hours for the remainder of the patients hospital course
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Subcutaneous Heparin 5000 Units given in the preoperative area one hour prior to surgery and continued every 8 hours for the remainder of the patients hospital course
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Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
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Number of Participants With Postoperative VTE Within 48 Hours After Surgery
Tijdsspanne: 48 hour postop period
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Number of participants with postoperative VTE (deep venous thrombosis (DVT) or pulmonary embolism (PE) as demonstrated by duplex sonography or high probability on ventilation-perfusion scan or CT chest angiography within 48 hour postop period
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48 hour postop period
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Secundaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
---|---|---|
Number of Participants With Bleeding Complications
Tijdsspanne: 30 day postop period
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30 day postop period
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Number of Participants With Postoperative Thrombocytopenia
Tijdsspanne: 30 day postop period
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Thrombocytopenia defined as >50% or greater drop in platelet count
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30 day postop period
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Number of Participants With Surgical Complications
Tijdsspanne: 30 day postop period
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Major or minor medical and surgical complications
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30 day postop period
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Hospital Stay
Tijdsspanne: 30 day postop period
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Length of postoperative hospital stay
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30 day postop period
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Number of Participants With VTE Within 30-day After Surgery
Tijdsspanne: 30 day postop period
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any VTE occuring within 30-days after surgery - clinical or asymptomatic - detected by venous duplex ultrasound, vq scan or ct pulmonary angiogram.
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30 day postop period
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Medewerkers en onderzoekers
Sponsor
Onderzoekers
- Hoofdonderzoeker: Phillip Fleshner, M.D, Cedars-Sinai Medical Center
Publicaties en nuttige links
Studie record data
Bestudeer belangrijke data
Studie start
Primaire voltooiing (Werkelijk)
Studie voltooiing (Werkelijk)
Studieregistratiedata
Eerst ingediend
Eerst ingediend dat voldeed aan de QC-criteria
Eerst geplaatst (Schatting)
Updates van studierecords
Laatste update geplaatst (Schatting)
Laatste update ingediend die voldeed aan QC-criteria
Laatst geverifieerd
Meer informatie
Termen gerelateerd aan deze studie
Aanvullende relevante MeSH-voorwaarden
Andere studie-ID-nummers
- DVT
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