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相关概念视频

Exercise Stress Test01:26

Exercise 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
Imaging Studies for Cardiovascular System V: CT01:28

Imaging 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...
Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT01:25

Imaging 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...
Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute 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...
Angina II: Classification01:27

Angina 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...
Angina III: Clinical Manifestations and Assessment01:29

Angina 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...

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相关实验视频

Updated: Jul 17, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

检测非临界冠状动脉狭窄在静止状态,而无需运动或药理应激.

Kevin Wei1, Elizabeth Le, Ananda R Jayaweera

  • 1Cardiovascular Imaging Center, Cardiovascular Division, University of Virginia, Charlottesville, VA 22908, USA.

Circulation
|January 16, 2002
PubMed
概括

非临界冠状动脉狭窄症可以通过测量心肌视频强度 (VI) 变化来检测静止状态. 这种方法评估了适应性微循环变化,可能消除了在诊断冠状动脉疾病时需要压力测试的需要.

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科学领域:

  • 心血管成像 - 心血管成像
  • 心声回声扫描 (Echocardiography) 是一种心声回声扫描.
  • 微循环研究 微循环研究

背景情况:

  • 目前检测非临界冠状动脉狭窄症需要压力.
  • 假设:通过评估远端微循环适应,可以检测静止状态下的狭窄症.

研究的目的:

  • 为了研究在静止状态下检测非临界冠状动脉狭窄症的潜力.
  • 用心肌视频强度 (VI) 来评估适应性微循环变化.

主要方法:

  • 在狗中使用高机械指数 (MI) 对比心声回声学测量静止时心肌 VI 的相位变化.
  • 获得的数据在基线和不同程度的冠状动脉狭窄.
  • 在基线使用高MI间歇成像测量毛细血管血液体积.

主要成果:

  • 在冠状动脉狭窄症中观察到缩性VI的显著增加.
  • 随着狭窄症的严重程度的增加,静态/透静VI比率逐渐增加.
  • 在基线上,在腹痛和心痛之间没有发现毛细血管血液体积的差异.

结论:

  • 毛细血管血液体积在体内没有表现出透缩-收缩变化.
  • 第六阶段变化,在基线时可以忽略不计,由于微循环适应,随着狭窄而增加.
  • 心肌 VI 阶段变化显示出在没有压力的静止状态下检测冠状动脉狭窄的潜力.