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相关概念视频

Heart Sounds01:15

Heart Sounds

1.9K
Heart sounds are generated by the turbulence in blood flow due to the closing of heart valves. These sounds are best perceived slightly away from the valves, where the blood flow disseminates the sound.
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V)...
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Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Pulse01:16

Pulse

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When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
508
Factors Influencing Heart Rate01:30

Factors Influencing Heart Rate

2.6K
The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
2.6K
Assessment of the Cardiovascular System IV: Auscultation01:25

Assessment of the Cardiovascular System IV: Auscultation

317
Cardiac auscultation is a clinical skill used to assess heart function and detect abnormalities. It involves listening to heart sounds at specific anatomical locations through a stethoscope.
Normal Heart Sounds
S1 (First Heart Sound)-
S1 is made by the closure of the mitral and tricuspid valves (atrioventricular valves), marking the beginning of systole.
S2 (Second Heart Sound)-
S2 is made by the closure of the aortic and pulmonic valves (semilunar valves), marking the end of the systole.
317
Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

965
Direct Method
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
965

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相关实验视频

Updated: Jun 28, 2025

Quantification of Mouse Heart Left Ventricular Function, Myocardial Strain, and Hemodynamic Forces by Cardiovascular Magnetic Resonance Imaging
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心脏声组件和血液动力学变量之间的相关性.

Yong-Seok Park1, Hyun-Seok Kim2, Seung-Ah Lee3

  • 1Department of Anesthesiology and Pain Medicine, Asan Medical Center, Brain Korea 21 Project, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Korea.

Scientific reports
|April 13, 2024
PubMed
概括

心声振幅 (S1amp) 变化与心脏收缩率变化相关,为在麻醉期间监测血液动力学变化提供了潜在的非侵入性方法.

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High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart
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科学领域:

  • 心血管生理学心血管生理学
  • 麻醉学 麻醉学
  • 生物医学工程 生物医学工程

背景情况:

  • 消化管听力镜用于在全身麻醉期间的持续听觉.
  • 声心图数据作为连续的血液动力学指数,尚未得到充分研究.
  • 了解心脏声音变化对于血液动力学监测至关重要.

研究的目的:

  • 为了研究心脏声音和血液动力学变量之间的关系.
  • 为了确定声心图数据是否可以作为连续的血液动力学指数.
  • 用心声区分血液动力学变化的原因.

主要方法:

  • 在麻醉猪身上进行实验性动物研究.
  • 通过多布他胺,埃斯莫洛尔,烯和尼卡迪平诱导血液动力学变化.
  • 通过下腔静脉 (IVC) 紧,通过限制静脉回流来减少心脏输出.

主要成果:

  • 在dobutamine和esmolol的使用过程中发现了S1振幅变化 (ΔS1amp) 和静脉血压 (ΔSBP),脉冲压 (ΔPP) 和ΔdP/dt之间的显著相关性.
  • S1幅度的变化与心脏收缩率的变化相关.
  • 没有观察到S1幅度变化和由烯和尼卡迪平诱导的血管阻力或心率变化的变化之间有显著的相关性.

结论:

  • 心声S1振幅与由于心脏收缩率变化的血液动力学变化有显著的相关性.
  • 声心图数据,特别是S1振幅,显示了作为一种非侵入性方法的潜力,用于监测和区分血液动力学变化的原因.
  • 进一步的研究可能会确定心脏声音是麻醉期间持续血液动力学监测的宝贵工具.