The Impact of Caffeine on Brachial Endothelial Function in Healthy Subjects and in Patients With Ischemic Heart Disease

This study has been completed.
Sponsor:
Information provided by:
Sheba Medical Center
ClinicalTrials.gov Identifier:
NCT00564824
First received: November 27, 2007
Last updated: February 24, 2010
Last verified: February 2010
  Purpose

Prior work (Chris, M. et al, Clinical Science 2005; 109, 55-60) has demonstrated that drinking a cup of coffee (80-100 mg of caffeine) an hour before endothelium-dependent FMD (flow-mediated dilatation) of the brachial artery, effects endothelial function in healthy adults subjects.

This effect might be attributed to caffeine, given that decaffeinated coffee (<2 mg of caffeine) was not associated with any change in endothelial performance.

In the current study we intend to further examine the impact of caffeine on brachial endothelial function among healthy subjects & in patients with proven ischemic heart disease.


Condition Intervention Phase
Coronary Disease
Drug: Caffeine
Drug: Placebo
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Crossover Assignment
Masking: Double Blind (Subject, Caregiver, Investigator)
Primary Purpose: Prevention
Official Title: The Impact of Caffeine on Brachial Endothelial Function in Healthy Subjects & in Patients With Ischemic Heart Disease

Resource links provided by NLM:


Further study details as provided by Sheba Medical Center:

Primary Outcome Measures:
  • Flow-mediated dilation (FMD) as surrogate of brachial artery endothelial function [ Time Frame: 1-2 hours post caffeine (or placebo) ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Markers of inflammation such as hs-CRP, Il6, homocysteine, serum caffeine level [ Time Frame: 1-2 hours post caffeine or placebo ] [ Designated as safety issue: No ]

Enrollment: 80
Study Start Date: November 2007
Study Completion Date: January 2010
Primary Completion Date: September 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: CAD patients
Patients with prior history of coronary artery disease (CAD) (myocardial infarction, cerebrovascular accident, coronary angioplasty, S/p CABG operation) who will be given on the first day either caffeine of placebo tablet and 1-2 hours thereafter a brachial artery endothelial function testing (BRT) will be assessed for measuring the FMD. After 1 week the patients will come for a second BRT on placebo/caffeine tablets. If the patient received caffeine tablet the first BRT, he will be receiving placebo tablet the second week, however, if the patient received placebo the first BRT, a caffeine tablet will be given prior to the second BRT.
Drug: Caffeine
Caffeine 200 mg tablet
Experimental: Placebo
Patients with prior history of coronary artery disease (CAD) (myocardial infarction, cerebrovascular accident, coronary angioplasty, S/p CABG operation) who will be given on the first day either caffeine of placebo tablet and 1-2 hours thereafter a brachial artery endothelial function testing (BRT) will be assessed for measuring the FMD. After 1 week the patients will come for a second BRT on placebo/caffeine tablets. If the patient received caffeine tablet the first BRT, he will be receiving placebo tablet the second week, however, if the patient received placebo the first BRT, a caffeine tablet will be given prior to the second BRT.
Drug: Placebo
Placebo pills

Detailed Description:

Background:

Prior work (Chris, M. et al, Clinical Science 2005; 109, 55-60) has demonstrated that drinking a cup of coffee (80-100 mg of caffeine) an hour before endothelium-dependent FMD (flow-mediated dilatation) of the brachial artery, effects endothelial function in healthy adults subjects.

This effect might be attributed to caffeine, given that decaffeinated coffee (<2 mg of caffeine) was not associated with any change in endothelial performance.

In the current study we intend to further examine the impact of caffeine on brachial endothelial function among healthy subjects & in patients with proven ischemic heart disease.

Aim:

To evaluate the impact of 200 mg caffeine tablet intake (equivalent to 2 cups of coffee), compared to placebo on brachial endothelial function in healthy subjects & in patients with proven ischemic heart disease.

Methods:

  1. Patients will be invited for two endothelial function tests 1 week apart.
  2. ECG, heart rate & blood pressure will be recorded at rest prior to each test.
  3. Following overnight fasting and discontinuation of all medications for ≥ 12 hours and absence of > 48 hour caffeine consumption, patients will receive 200 mg of caffeine tablets or placebo, in a double-blind, cross-over study design. An hour later the patient will undergo endothelium-dependent flow-mediated dilation (FMD) and endothelium-independent, nitroglycerin (NTG)-mediated vasodilation will be assessed non-invasively in the brachial artery, using a high resolution (15 MHz) linear array ultrasound.
  4. Prior to and after the FMD, blood will be drawn to test caffeine levels, adiponectin, CBC, electrolytes, CRP and lipids.
  Eligibility

Ages Eligible for Study:   18 Years to 75 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • Patients with documented ischemic heart disease
  • Healthy subjects who are not heavy regular coffee drinkers

Exclusion Criteria:

  • Patients with unstable angina pectoris
  • Patients with acute or chronic heart failure
  • Patients with cardiac arrhythmia
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00564824

Locations
Israel
Heart Institute, Chaim Sheba Medical Center
Tel Hashomer, Israel, 52621
Sponsors and Collaborators
Sheba Medical Center
Investigators
Principal Investigator: Michael Shechter, MD, MA Heart Institute, Chaim Sheba Medical Center, Tel Aviv University
Study Director: Guy Shalmon, RD Tel Aviv University
  More Information

Additional Information:
No publications provided

Responsible Party: Michael Shechter, MD, PI, Heart Institute, Sheba Medical Center
ClinicalTrials.gov Identifier: NCT00564824     History of Changes
Other Study ID Numbers: SHEBA-07-4913-MS-CTIL
Study First Received: November 27, 2007
Last Updated: February 24, 2010
Health Authority: Israel: Israeli Health Ministry Pharmaceutical Administration

Keywords provided by Sheba Medical Center:
coronary disease
atherosclerosis
endothelial function
caffeine
cerebrovascular disease
prevention

Additional relevant MeSH terms:
Coronary Artery Disease
Myocardial Ischemia
Coronary Disease
Heart Diseases
Cardiovascular Diseases
Arteriosclerosis
Arterial Occlusive Diseases
Vascular Diseases
Caffeine
Central Nervous System Stimulants
Physiological Effects of Drugs
Pharmacologic Actions
Central Nervous System Agents
Therapeutic Uses
Phosphodiesterase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Purinergic P1 Receptor Antagonists
Purinergic Antagonists
Purinergic Agents
Neurotransmitter Agents

ClinicalTrials.gov processed this record on July 26, 2014