関連する実験動画
Updated: Aug 7, 2026

08:09
Transthoracic Echocardiography in Mice
Published on: May 29, 2010
磁気共振ジェット速度のマッピングは,ミトラ弁と大動脈弁の狭窄症におけるものです
P J Kilner1, C C Manzara, R H Mohiaddin
1Magnetic Resonance Unit, Royal Brompton National Heart and Lung Hospital, London, UK.
Circulation
|April 1, 1993
まとめ
磁気共鳴 (MR) 段階移転速度マッピングは,心臓弁の狭窄における乱流ジェットフローを正確に測定します. このテクニックはドップラー超音波と良好な一致を示しており,狭窄の評価を改善する可能性を秘めています.
科学分野:
- 心血管画像検査 (CVDI) について
- 医学物理 医学物理学
- フローダイナミクス フローダイナミクス
背景:
- 磁気共鳴 (MR) 段階移転速度マッピングは,非乱流の流れのために確立されています.
- 短縮されたエコー時間は,乱流のジェットフローにMRの適用を可能にします.
- 心臓弁の狭窄症患者の検証が必要でした.
研究 の 目的:
- 心臓弁の狭窄症の患者のMRジェット速度マッピングを検証する.
- MR測定をドップラー回声心臓撮影と比較するために.
主な方法:
- ピークポストステノティックジェット速度測定のために0.5-TピッカーMRIマシンを使用しました.
- ミトラル管または大動脈狭窄症の患者15人を募集しました.
- 比較のために同時ドップラーエコーカルディオグラフィーを実行しました.
主要な成果:
- 29件のMR研究のうち28件 (97%) で,解釈可能な速度マップが得られた.
- MRとドップラーピークジェット速度の測定は良好な一致を示しました (平均差 0.23 m/sec,SD 0.49 m/sec).
- 測定は,ミトラル管および大動脈狭窄症の患者に取られた.
結論:
- In vivo MRのピークジェット速度測定は,ドップラー超音波とよく相関しています.
- MR技術は,ドップラーとは異なり,音響窓によって制限されていません.
- MRは,特に超音波へのアクセスが困難である場合,狭窄の評価を改善する可能性があります.
さらに関連する動画
関連する概念動画
Mitral Regurgitation I: Introduction
Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
Mitral Regurgitation II: Clinical Features and Diagnostic Tests
Mitral regurgitation (MR) is a valvular heart disorder in which the mitral valve fails to close tightly, allowing blood to leak backward into the heart. Understanding the clinical manifestations, assessment, diagnostic findings, and medical management of MR is crucial to effectively managing affected patients.Clinical Manifestations of Mitral RegurgitationMitral regurgitation can be acute or chronic, each presenting differently and requiring different approaches:1. Acute Mitral...
Mitral Stenosis I: Introduction
Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
Mitral Stenosis II: Clinical features and Diagnostic Tests
Mitral stenosis is a heart condition in which the mitral valve, which allows blood to flow from the left atrium to the left ventricle, becomes narrowed or stenotic. This narrowing hinders blood flow and leads to clinical symptoms requiring specific medical evaluations and management strategies. The following overview outlines the clinical symptoms, assessments, diagnostic findings, prevention methods, and treatments for mitral stenosis.Clinical ManifestationsDyspnea (shortness of breath): This...
Aortic Regurgitation I: Introduction
IntroductionAortic regurgitation is characterized by the backward flow of blood from the aorta into the left ventricle during diastole and arises from the improper closure of the aortic valve. This condition results in left ventricular volume overload and can stem from both acute and chronic etiologies, each contributing uniquely to the disease's progression and symptomatology.Acute and Chronic CausesAcute aortic regurgitation often results from events that suddenly impair the integrity of the...
Aortic Regurgitation II: Clinical Features and Diagnostic Tests
Aortic valve regurgitation (AR) occurs when the aortic valve fails to close properly, allowing blood to flow backward from the aorta into the left ventricle. This backflow can result in two distinct clinical presentations: acute and chronic AR, each characterized by its own set of symptoms and physical findings.Acute Aortic RegurgitationAcute AR presents with a sudden onset of severe symptoms. Patients typically experience profound dyspnea (shortness of breath), chest pain, and signs of left...

