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Glutamate and Diastolic Function in Patients Undergoing Aortic Valve Repair

This study has been completed.
Information provided by:
Medical University of Vienna Identifier:
First received: June 14, 2010
Last updated: June 15, 2010
Last verified: September 2008

Purpose: The effect of intravenous glutamate infusion on myocardial diastolic function and overall hemodynamics were studied in patients undergoing elective aortic valve replacement with severe aortic stenosis and associated left ventricular hypertrophy .

Methods: 25 patients will be included in this double-blind randomized placebo-controlled study. Glutamate was administered intravenously immediately after aortic cross-clamp release. The patients receive either a low dose of 30mg kg-1 h-1 (LG-group) or high dose of 60 mg kg-1 h-1 (HG-group) or placebo (P-group) at a rate of 3.3ml kg-1h-1 for 2h. Transesophageal echocardiography (TEE) is used to measure diastolic and systolic ventricular function before sternotomy (T0), and 2h (T2), 3h (T3) and 6h (T4) after release of cross clamp. Additionally routine hemodynamic parameters are measured intraoperatively.

Condition Intervention Phase
Hypertrophy, Left Ventricular
Aortic Stenosis
Myocardial Ischemia
Cardiopulmonary Bypass
Drug: LG-group
Drug: HG-group
Drug: Placebo-group
Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Pharmacokinetics/Dynamics Study
Intervention Model: Parallel Assignment
Primary Purpose: Treatment
Official Title: Glutamate Infusion in Hypertrophied Ventricle After Aortic Valve Replacement - a Randomized Trial

Resource links provided by NLM:

Further study details as provided by Medical University of Vienna:

Primary Outcome Measures:
  • flow propagational velocity [ Designated as safety issue: No ]
  • Isovolumic relaxation time [ Designated as safety issue: No ]
  • E-velocity [ Designated as safety issue: No ]
  • A-velocity [ Designated as safety issue: No ]
  • E/A ratio [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • ejection fraction [ Designated as safety issue: No ]
  • cardiac output [ Designated as safety issue: No ]
  • mitral ring motion [ Designated as safety issue: No ]

Enrollment: 27
Study Start Date: February 2006
Study Completion Date: September 2008
Primary Completion Date: November 2007 (Final data collection date for primary outcome measure)

Ages Eligible for Study:   19 Years to 90 Years   (Adult, Senior)
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • severe aortic stenosis
  • left ventricular hypertrophy of more than 10mm IVS thickness
  • normal ejection fraction
  • SR

Exclusion Criteria:

  • moderately or severely reduced systolic left ventricular function (ejection fraction <30%)
  • atrial fibrillation or flutter
  • intolerance to glutamate.
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Please refer to this study by its identifier: NCT01144039

Clin. Dept. of Cardiothoracic and Vascular Anaesthesia & Intensive Medicine, Medical University of Vienna, Vienna General Hospital
Vienna, Austria, 1090
Sponsors and Collaborators
Medical University of Vienna
  More Information Identifier: NCT01144039     History of Changes
Other Study ID Numbers: VI_echo_01_2006 
Study First Received: June 14, 2010
Last Updated: June 15, 2010
Health Authority: Austria: Austrian Federal Office for Safety in Health Care

Additional relevant MeSH terms:
Myocardial Ischemia
Coronary Artery Disease
Aortic Valve Stenosis
Hypertrophy, Left Ventricular
Pathologic Processes
Heart Diseases
Cardiovascular Diseases
Vascular Diseases
Coronary Disease
Arterial Occlusive Diseases
Heart Valve Diseases
Ventricular Outflow Obstruction
Pathological Conditions, Anatomical
Cardiomegaly processed this record on December 08, 2016