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Influence of CPB Temperature on CABG Morbidity

This study has been completed.
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI) Identifier:
First received: October 27, 1999
Last updated: June 23, 2005
Last verified: May 2002

To compare three accepted modes of myocardial preservation, warm, tepid, and cold blood cardioplegia, coinciding with normothermic (37 degrees centigrade), tepid (32 degrees centigrade) and hypothermic (8 to 10 degrees centigrade) cardiopulmonary bypass (CPB) to define differences in neurologic function in coronary artery bypass graft (CABG) patients.

Condition Intervention Phase
Cardiovascular Diseases
Coronary Disease
Heart Diseases
Myocardial Ischemia
Neurologic Manifestations
Procedure: cardiopulmonary bypass
Procedure: heart arrest, induced
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Primary Purpose: Treatment

Further study details as provided by National Heart, Lung, and Blood Institute (NHLBI):

Study Start Date: January 1994
Estimated Study Completion Date: December 1996
Detailed Description:


A pilot study of warm versus cold perfusion and preservation was completed in 32 patients prior to the ongoing study. The findings of the pilot study showed 53 percent of patients had evidence of new neurologic disturbance at postoperative day four. Only the neurologic dysfunction could be correlated with warm versus cold perfusion (37.5 percent warm versus 75 percent cold, P less than 0.05). The changes in neurologic function had abated or clearly improved by one month of follow-up, and the distinction in neurologic dysfunction grading was no longer apparent between the two groups.


Patients were randomly assigned to cold, tepid, or warm blood cardioplegia, coinciding with normothermic, tepid, and hypothermic cardiopulmonary bypass. All patients received a standard anesthetic protocol combining narcotic and inhalational anesthesia. Each patient entering the study had extensive clinical data collected prospectively incorporating most aspects of measurable determinants related to myocardial preservation. Additionally, neurologic tests were performed by a blinded neurologist and rated by an objective scoring system, the Mathew scale. The studies were performed preoperatively, on the third or fourth postoperative day, and at one month following surgery. Hematologic data were measured for fibrinolytic potential.


Ages Eligible for Study:   18 Years to 70 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Patients, referred for elective or urgent coronary revascularization, not having ongoing angina instability, requiring three or more bypass grafts, and under 70 years of age.

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No Contacts or Locations Provided
  More Information

Publications: Identifier: NCT00000604     History of Changes
Other Study ID Numbers: 108
Study First Received: October 27, 1999
Last Updated: June 23, 2005
Health Authority: United States: Federal Government

Additional relevant MeSH terms:
Cardiovascular Diseases
Coronary Artery Disease
Coronary Disease
Heart Diseases
Myocardial Ischemia
Neurologic Manifestations
Arterial Occlusive Diseases
Nervous System Diseases
Signs and Symptoms
Vascular Diseases processed this record on November 25, 2014