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A Comparison of Renal Perfusion in Thoracoabdominal Aortic Aneurysm (TAAA) Repair

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00691756
Recruitment Status : Completed
First Posted : June 5, 2008
Last Update Posted : June 5, 2008
Gillson-Longenbaugh Foundation
Texas Heart Institute
Information provided by:
Baylor College of Medicine

Tracking Information
First Submitted Date  ICMJE June 3, 2008
First Posted Date  ICMJE June 5, 2008
Last Update Posted Date June 5, 2008
Study Start Date  ICMJE January 2002
Actual Primary Completion Date December 2006   (Final data collection date for primary outcome measure)
Current Primary Outcome Measures  ICMJE
 (submitted: June 4, 2008)
Renal dysfunction [ Time Frame: 10 postoperative days ]
Original Primary Outcome Measures  ICMJE Same as current
Change History No Changes Posted
Current Secondary Outcome Measures  ICMJE
 (submitted: June 4, 2008)
Renal injury (increase in urinary biomarkers) [ Time Frame: 7 postoperative days ]
Original Secondary Outcome Measures  ICMJE Same as current
Current Other Pre-specified Outcome Measures Not Provided
Original Other Pre-specified Outcome Measures Not Provided
Descriptive Information
Brief Title  ICMJE A Comparison of Renal Perfusion in Thoracoabdominal Aortic Aneurysm (TAAA) Repair
Official Title  ICMJE A Comparison of Cold Blood Versus Cold Crystalloid Renal Perfusion for Prevention of Acute Renal Failure Following Thoracoabdominal Aortic Aneurysm Repair: A Randomized Study
Brief Summary The purpose of this randomized trial was to determine whether renal perfusion with cold blood provides better protection against renal ischemia than perfusion with cold crystalloid in patients undergoing TAAA repair with left heart bypass.
Detailed Description Despite improvements in surgical techniques and postoperative care, renal dysfunction has consistently remained a significant and potentially lethal complication after thoracoabdominal aortic aneurysm (TAAA) repair. In an attempt to alleviate postoperative renal failure and its associated mortality, several techniques and intraoperative strategies have been used including: intraoperative administration of diuretics, steroids, or prostaglandins; minimization of ischemic times; renal hypothermia with cold crystallid solutions; selective warm (normothermic) blood perfusion as part of a left heart bypass (LHB) system; and hemodilution. However, despite the use of adjuvant techniques, the incidence of renal failure after TAAA repair still ranges from 3% to 27%. One of the techniques mentioned above involves cold crystalloid renal artery perfusion. This method aims to reduce metabolic needs of the renal system by inducing local hypothermia. Because oxygen consumption decreases 7% for each degree Celsius that temperature is reduced, the metabolic needs of tubular cells are reduced by almost 50% at 30 degrees Celsius. After the aorta is clamped and opened, the renal arteries are perfused with lactated Ringers solution (LR) that has been cooled to 4 degrees Celsius utilizing a roller pump to transport the LR through an appropriately cooled ice bath. This decreases the temperature of the kidneys to an average of 20 degrees Celsius. The volume of LR required to achieve this temperature ranges from 600 to 1800 ml. Renal cooling has been shown to preserve renal tissue as long as warm ischemic time is kept to a minimum. We recently compared renal artery cold crystalloid perfusion with normothermic blood perfusion in a randomized clinical trial involving 30 patients and discovered via multivariable analysis that cold LR was protective against acute postoperative renal dysfunction. In this study, we found that 62.5% of patients receiving normothermic blood perfusion developed acute postoperative renal dysfunction versus 21.4% in the cold LR group (p = 0.03). One method of renal protection not often used involves selective cold blood perfusion of the renal arteries. This technique also aims to reduce renal ischemic time during aortic cross-clamping and improve oxygenation to renal tissues; thereby, preventing reperfusion injury and organ dysfunction often associated with this operation. During aneurysm repair, left atrio-distal aortic bypass is performed using a centrifugal pump. Tubing connected to the distal end of this circuit passes through a container of ice allowing the perfusion of both renal arteries with cold blood. The flow rates into the renal arteries range from 100 to 450 ml/min. The celiac axis and superior mesenteric artery remain individually perfused in the standard fashion using normothermic blood. The best method of achieving renal protection remains unclear. Currently, normothermic blood and cold LR remain the two most commonly used methods of renal artery perfusion during TAAA repair. This randomized trial compared the effectiveness of two forms of renal artery perfusion, cold LR versus cold blood, to identify which method is more beneficial in the prevention of postoperative renal dysfunction.
Study Type  ICMJE Interventional
Study Phase  ICMJE Not Applicable
Study Design  ICMJE Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Participant)
Primary Purpose: Treatment
Condition  ICMJE Renal Failure
Intervention  ICMJE
  • Procedure: Cold blood renal perfusion
    Both kidneys receive intermitent perfusion with cold (4 degrees C) autologous blood during thoracoabdominal aortic aneurysm repair.
  • Procedure: Cold crystalloid renal perfusion
    Both kidneys receive intermittent perfusion with cold (4 degrees C) lactated Ringer's solution during thoracoabdominal aortic aneurysm repair. This is the standard renal perfusion technique in our practice.
Study Arms  ICMJE
  • Experimental: 1
    Cold blood renal perfusion
    Intervention: Procedure: Cold blood renal perfusion
  • Active Comparator: 2
    Cold crystalloid renal perfusion
    Intervention: Procedure: Cold crystalloid renal perfusion
Publications * Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
Recruitment Information
Recruitment Status  ICMJE Completed
Actual Enrollment  ICMJE
 (submitted: June 4, 2008)
Original Actual Enrollment  ICMJE Same as current
Actual Study Completion Date  ICMJE December 2006
Actual Primary Completion Date December 2006   (Final data collection date for primary outcome measure)
Eligibility Criteria  ICMJE

Inclusion Criteria:

  • age equal to or greater than 18
  • planned extent II or III thoracoabdominal aortic aneurysm repair
  • planned left heart bypass
  • patient consent obtained

Exclusion Criteria:

  • impaired left ventricular function
  • impaired renal function
  • prior thoracoabdominal aortic aneurysm repair
  • pseudoaneurysm
  • pre-existing liver disease
  • free aortic aneurysm rupture
  • inability to measure renal temperature
  • extent I or IV thoracoabdominal aortic aneurysm repair
Sex/Gender  ICMJE
Sexes Eligible for Study: All
Ages  ICMJE 18 Years and older   (Adult, Older Adult)
Accepts Healthy Volunteers  ICMJE No
Contacts  ICMJE Contact information is only displayed when the study is recruiting subjects
Listed Location Countries  ICMJE United States
Removed Location Countries  
Administrative Information
NCT Number  ICMJE NCT00691756
Other Study ID Numbers  ICMJE H-9764
Has Data Monitoring Committee No
U.S. FDA-regulated Product Not Provided
IPD Sharing Statement  ICMJE Not Provided
Responsible Party Scott A. LeMaire, MD, Baylor College of Medicine
Study Sponsor  ICMJE Baylor College of Medicine
Collaborators  ICMJE
  • Gillson-Longenbaugh Foundation
  • Texas Heart Institute
Investigators  ICMJE
Principal Investigator: Scott A. LeMaire, MD Baylor College of Medicine
PRS Account Baylor College of Medicine
Verification Date June 2008

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP