Technical Development of Cardiovascular Magnetic Resonance Imaging
This study will explore new ways of using magnetic resonance imaging (MRI) to evaluate the heart and blood vessels of patients with cardiovascular disease, including better detection of myocardial infarction (heart attack) and blockage of heart and leg arteries.
Patients 18 years of age and older with cardiovascular disease may be eligible for this study.
All participants will have magnetic resonance imaging of the heart. MRI uses a magnetic field and radio waves to show structural and chemical changes in tissues. For the procedure, the patient lies on a table surrounded by a metal cylinder (the scanner). A 'gadolinium contrast' material may be injected into the patient s vein during part of the study to brighten the images. Patients wear earplugs during the scan to muffle loud knocking sounds caused by the electrical switching of the magnetic fields. They will be asked to hold their breath intermittently for 5 to 20 seconds during the scan. They will be monitored with an electrocardiogram (EKG) during the procedure and will be in contact by intercom at all times with the person performing the scan. Patients can request to stop the study and come out of the scanner at any time. The procedure may last from 30 to 90 minutes. An echocardiogram a test that uses sound waves to produce pictures of the heart and blood vessels-may be done to confirm the MRI findings. In addition, patients may undergo one or more of the following optional studies:
- Dobutamine stress MRI - This test uses dobutamine-a medicine that simulates exercise by increasing heart rate and heart function-to detect blockages in the coronary arteries (vessels that supply oxygen and nutrients to the heart) and locate areas of the heart that are permanently damaged, perhaps by a previous heart attack. For this test, MRI pictures of the heart are taken before, during and after administration of dobutamine. Gadolinium may be injected during part of the study to brighten the images. An EKG will be used to monitor the heart during the procedure.
- Vasodilator MRI - The procedure and objectives of this test are the same as those described for dobutamine stress MRI, except that this study uses dipyridamole or adenosine. These drugs dilate blood vessels, causing increased blood flow to the heart.
- Plethysmography MRI - This test determines the presence and severity of narrowing in arteries that supply blood to the leg. Blockage of these vessels often causes pain while walking. This study will compare plethysmography MRI with venous occlusion plethysmography, an older method of measuring blood flow in the legs. For venous occlusion plethysmography, a large blood pressure cuff is placed around the upper leg and a strain gauge (thin elastic band) is placed around the calf. The pressure cuff is inflated very tightly for 5 minutes to block blood flow to the leg, and another pressure cuff over the ankle is also inflated. When the large cuff is deflated, blood rushes to the leg, a smaller cuff is inflated to a low pressure, and the strain gauge measures the maximum blood flow to the leg for 1 or 2 more minutes. This procedure is done once or twice outside the MRI scanner and once or twice inside the scanner. The scans are performed as described above for the dobutamine and vasodilator studies. The strain gauge is not used for plethysmography MRI the MRI pictures are used to measure flow.
調査の概要
詳細な説明
研究の種類
入学 (実際)
連絡先と場所
研究場所
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Maryland
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Bethesda、Maryland、アメリカ、20892
- National Institutes of Health Clinical Center, 9000 Rockville Pike
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Bethesda、Maryland、アメリカ、20814
- Suburban Hospital
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参加基準
適格基準
就学可能な年齢
健康ボランティアの受け入れ
受講資格のある性別
サンプリング方法
調査対象母集団
Patients with cardiovascular diseases and healthy subjects 18 years of age or older were recruited within this protocol. The exclusion criteria were developed from standard clinical practice but were more restrictive to err on the side of safety. Recruitment was via referral from local physicians. In addition, advertisements were placed in the "Washington Post". Finally, the protocol was listed on the NIH websites.
A patient could participate in any combination of these tests/procedures. Clinical judgment was used to determine the number of tests/procedures suitable for a given patient. Specifically, the responsible physician avoided prolonging tests/procedures in patients in accordance with the patient's clinical status.
説明
-INCLUSION CRITERIA:
Inclusion Criteria for All Arms of the Protocol:
- Subjects 18 years of age or older
- Written informed consent
EXCLUSION CRITERIA:
Exclusion Criteria for All Arms of the Protocol:
Patients with a contraindication to MRI scanning will be excluded. These contraindications include patients with the following devices:
- Central nervous system aneurysm clips;
- Implanted neural stimulator;
- Implanted cardiac pacemaker or defibrillator;
- Cochlear implant;
- Ocular foreign body (e.g. metal shavings);
- Implanted Insulin pump;
- Metal shrapnel or bullet.
In addition, the following patient groups will be excluded:
- Pregnant women (Patients who are uncertain as to whether they are pregnant will be required to have a screening urine or blood pregnancy test)
- Patients with active symptoms of myocardial ischemia occurring despite maximally tolerated doses of oral antianginal therapy and intravenous nitroglycerin
Furthermore, the following patient groups will be excluded from studies involving the administration of MRI contrast agents:
- lactating women unless they are willing to discard breast milk for 24 hours after receiving gadolinium
- renal disease (estimated glomerular filtration rate (eGFR) less than 30 ml/min/1.73 m(2) body surface area)
The eGFR will be used to estimate renal function if reported by the laboratory, or as reported by NIH Clinical Center or Suburban Hospital or other clinically certified laboratories. Otherwise, estimated glomerular filtration rate (eGFR) can be based on the Modification of Diet in Renal Disease (MDRD) study equation (see below) in subjects with stable renal function. This formula is not applicable to patients with acute renal insufficiency:
eGFR (ml/min/1.73 m(2)) equal to 175 times (serum creatinine)-1.154 times (age)-0.203 times 0.742 (if the subject is female) times1.212 (if the subject is black)
Additional Exclusion Criteria for Dobutamine, or Vasodilator Stress MRI:
- Myocardial infarction within 48 hours
- Uncontrolled congestive heart failure
- Severe hypertension (SBP greater than 200, DBP greater than 110) (exclusion only for dobutamine and bicycle)
- Atrial fibrillation. This exclusion only applies to Dobutamine stress.
- Frequent PVC s (more than 1 every 10 heart beats or non-sustained ventricular tachycardia (greater than 4 beat runs) or ongoing sustained ventricular tachycardia. This exclusion only applies to Dobutamine and Bicycle stress
- Patients with narrow angle glaucoma and known or suspected prostatic obstruction will not receive atropine
Additional Exclusion Criteria for PET/MR perfusion scans
- Pregnant patients
- Patients that are breast feeding
研究計画
研究はどのように設計されていますか？
デザインの詳細
コホートと介入
グループ/コホート |
介入・治療 |
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Participants with cardiovascular diseases
Patients may receive an intravenous injection of gadobutrol (Gadavist) not to exceed 0.2 mmol/kg of Gd per bolus injection and per examination.
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Investigational or research MRI coils may be used in the protocol.
The coils are noninvasive devices external to the body.
The coils act as antennae to receive small radiofrequency signals out of the body.
Coils of the type we use are used daily in clinical MRI practice.
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Healthy Participants
Patients may receive an intravenous injection of gadobutrol (Gadavist) not to exceed 0.2 mmol/kg of Gd per bolus injection and per examination.
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Investigational or research MRI coils may be used in the protocol.
The coils are noninvasive devices external to the body.
The coils act as antennae to receive small radiofrequency signals out of the body.
Coils of the type we use are used daily in clinical MRI practice.
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この研究は何を測定していますか？
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
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examine the rate of major cardiovascular events (MACE) defined as cardiac death, non- fatal myocardial infarction, cerebrovascular / transient ischemic attack, and revascularization in patients undergoing stress or rest cardiac MRI
時間枠：Ongoing
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examine the rate of major cardiovascular events (MACE) defined as cardiac death, non- fatal myocardial infarction, cerebrovascular / transient ischemic attack, and revascularization in patients undergoing stress or rest cardiac MRI and to relate these events to the extent of ischemia and infarction seen on the MRI exams
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Ongoing
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協力者と研究者
捜査官
- 主任研究者：Arlene Sirajuddin, M.D.、National Heart, Lung, and Blood Institute (NHLBI)
出版物と役立つリンク
一般刊行物
- Baer FM, Voth E, Theissen P, Schicha H, Sechtem U. Gradient-echo magnetic resonance imaging during incremental dobutamine infusion for the localization of coronary artery stenoses. Eur Heart J. 1994 Feb;15(2):218-25. doi: 10.1093/oxfordjournals.eurheartj.a060479.
- Baer FM, Voth E, Schneider CA, Theissen P, Schicha H, Sechtem U. Comparison of low-dose dobutamine-gradient-echo magnetic resonance imaging and positron emission tomography with [18F]fluorodeoxyglucose in patients with chronic coronary artery disease. A functional and morphological approach to the detection of residual myocardial viability. Circulation. 1995 Feb 15;91(4):1006-15. doi: 10.1161/01.cir.91.4.1006.
- Baer FM, Voth E, Theissen P, Schneider CA, Schicha H, Sechtem U. Coronary artery disease: findings with GRE MR imaging and Tc-99m-methoxyisobutyl-isonitrile SPECT during simultaneous dobutamine stress. Radiology. 1994 Oct;193(1):203-9. doi: 10.1148/radiology.193.1.8090892.
- Ta AD, Hsu LY, Conn HM, Winkler S, Greve AM, Shanbhag SM, Chen MY, Patricia Bandettini W, Arai AE. Fully quantitative pixel-wise analysis of cardiovascular magnetic resonance perfusion improves discrimination of dark rim artifact from perfusion defects associated with epicardial coronary stenosis. J Cardiovasc Magn Reson. 2018 Mar 8;20(1):16. doi: 10.1186/s12968-018-0436-0.
- Hsu LY, Jacobs M, Benovoy M, Ta AD, Conn HM, Winkler S, Greve AM, Chen MY, Shanbhag SM, Bandettini WP, Arai AE. Diagnostic Performance of Fully Automated Pixel-Wise Quantitative Myocardial Perfusion Imaging by Cardiovascular Magnetic Resonance. JACC Cardiovasc Imaging. 2018 May;11(5):697-707. doi: 10.1016/j.jcmg.2018.01.005. Epub 2018 Feb 14.
- Nielles-Vallespin S, Kellman P, Hsu LY, Arai AE. FLASH proton density imaging for improved surface coil intensity correction in quantitative and semi-quantitative SSFP perfusion cardiovascular magnetic resonance. J Cardiovasc Magn Reson. 2015 Feb 17;17(1):16. doi: 10.1186/s12968-015-0120-6.
- Chen MY, Bandettini WP, Shanbhag SM, Vasu S, Booker OJ, Leung SW, Wilson JR, Kellman P, Hsu LY, Lederman RJ, Arai AE. Concordance and diagnostic accuracy of vasodilator stress cardiac MRI and 320-detector row coronary CTA. Int J Cardiovasc Imaging. 2014 Jan;30(1):109-19. doi: 10.1007/s10554-013-0300-0. Epub 2013 Oct 12.
研究記録日
主要日程の研究
研究開始 (実際)
一次修了 (実際)
研究の完了 (実際)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (見積もり)
学習記録の更新
投稿された最後の更新 (実際)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
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