運動や薬理学的ストレスに頼らずに静止中の非臨界冠動脈狭窄症の検出
Kevin Wei1, Elizabeth Le, Ananda R Jayaweera
1Cardiovascular Imaging Center, Cardiovascular Division, University of Virginia, Charlottesville, VA 22908, USA.
Circulation
|January 16, 2002
まとめ
非臨界冠動脈狭窄症は,心筋のビデオ強度 (VI) の変化を測定することによって,静止状態で検出することができます. この方法は,適応性マイクロ循環の変化を評価し,冠動脈疾患の診断においてストレステストの必要性を潜在的に排除します.
科学分野:
- 心血管画像検査についてです.
- エコーカルディオグラフィー エコーカルディオグラフィー
- マイクロ循環の研究
背景:
- 非臨界の冠動脈狭窄症の現在の検出は,ストレスを必要とします.
- 仮説: 狭窄症は,遠端微循環の適応を評価することによって,静止状態で検出することができます.
研究 の 目的:
- 休息中の非臨界冠動脈狭窄症の検出の可能性を調査する.
- 心筋のビデオ強度 (VI) を用いて適応性マイクロ循環変化を評価する.
主な方法:
- 犬における高メカニカル指数 (MI) コントラストエコーカルディオグラフィーを用いて,静止状態の心筋 VI の相変化を測定した.
- ベースラインで取得したデータと,さまざまな程度の冠動脈狭窄.
- 高MI間歇性画像を用いてベースラインで毛細血管血量測定.
主要な成果:
- 静脈動脈VIの有意な増加は,冠動脈狭窄症で観察されました.
- シストリック/ダイアストリックVI比は,狭窄症の重症度が大きくなるにつれて徐々に増加した.
- 発症時点でのダイアストールとシストールの間で毛細血管の血量に差は認められませんでした.
結論:
- 毛細血管の血液量は,体内では静脈動脈-静脈動脈の変化を示さない.
- ベースラインでは無視できる段階VIの変化は,マイクロ循環器の適応による狭窄症で増加します.
- 心筋第6相の変化は,ストレスのない静止状態での冠動脈狭窄の検出の可能性を示しています.
関連する概念動画
01:26Exercise Stress Test
Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
01:28Imaging Studies for Cardiovascular System V: CT
Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
01:25Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT
Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
01:30Acute Coronary Syndrome III: Diagnostic Studies
Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
01:27Angina II: Classification
Angina, also known as angina pectoris, is a chest pain resulting from diminished blood flow to the heart muscle and is often a symptom of coronary artery disease. Angina presents several variants with distinctive attributes, etiologies, and therapeutic approaches. The main types of angina include stable, unstable, variant (Prinzmetal's), microvascular, intractable, and silent ischemia.Stable angina is caused by atherosclerosis, which leads to the formation of plaques that narrow the coronary...
01:29Angina III: Clinical Manifestations and Assessment
Angina manifests as chest pain, tightness, or squeezing discomfort typically located behind the breastbone. It can radiate to the neck, jaw, shoulders, and inner aspects of the upper arms, most commonly the left arm. Patients may experience shortness of breath, fatigue, profuse sweating, dizziness, indigestion, heartburn, palpitations, anxiety, and vomiting as accompanying symptoms. This pain often lasts a few minutes and is triggered by physical exertion, emotional stress, heavy meals, or cold...